TM 11-2059 (TP-9 and TA 264-PT Field Telephones)

DEPARTMENT OF THE ARMY TECHNICAL MANUAL
u~ ~~c~®~~ u@ ~~W~c~u~~c~~

DEPARTMENT OF THE AIR FORCE TECHNICAL ORDER

TELEPHONE TP-9 AND TELEPHONE SET TA-264/PT

DEPARTMENTS OF THE ARMY AND THE AIR FORCE OCTOBER 1957

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*TM 11-2059/TO 31Wl-3TP9-21

DEPARTMENTS OF THE ARMY AND THE AIR FORCE

TEcHNICAL MANUAL) No. 11-2059 ~

TEcHNICAL ORDER (

No. 31Wl-3TP9-21 )

WASHINGTON 25, D. C., 17 October 1957

TELEPHONE TP-9 AND TELEPHONE SET TA-264/PT

CHAPTER 1. INTRODUCTION

Sectioa I. General _

II. Description and data ----

CHAPTER 2. INSTALLATION AND OPERATION

Section I. Service upon receipt of equipment ~ _

II. Installation -- _

III. Operation under usual cenditions ---

IV. Operation under unusual conditions _

CHAPTER 3. ORGANIZATIONAL MAINTENANCE

Section I. First echelon (operator) maintenance _

II. Second echelon maintenance _

Paragraph Page
1,2 3
3-8 3
9-11 6
12,13 6
14-19 8
20-23 9
24-27 11
28--33 16
34~41 19
42-46 24
47-61 28
62-67 32
68--72 36 CHAPTER 4. THEORY ~-------- _

5. FIELD MAINTENANCE

Section I. General troubleshooting information _

II. Removal and replacement , _

III. Lubrication and adjustments _

IV. Final testing _

CHAPTER 6. SHIPMENT AND LIMITED STORAGE AND DEMOLITION TO PREVENT

ENEMY USE

Section I. Shipment and limited storage ~____________________________________________ 73,74 39

II. Demolition of materiel to prevent enemy use______________________________________ 75,76 39

INDEX --- _

45

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• This manual supersedes TM 11-2059, 9 December 1944, including C 1, 20 December 1945, C 2, 5 June 1950, and C 3, 14 April 1954.

Figure 1. TerepMnfJ TP-9.

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CHAPTER 1 INTRODUCTION

Section I. GENERAL

1. Scope

a. This manual covers the installation, operation, and maintenance of Telephone TP-9 and Telephone Set TA-264/PT.

b. Forward any comments on this publication direct to Commanding Officer, U. S. Army Signal Publications Agency, Fort Monmouth, N. J.

c. Throughout this manual, the term telephones will be used to identify Telephone TP-9 and Telephone Set TA-264/PT.

2. Forms and Records

a. Unsatisfactory Equipment Reports. Fill out and forward DA Form 468 (Unsatisfactory Report to Commanding Officer) Signal Equipment Support Agency, Fort Monmouth, New Jersey, as prescribed in AR 700--38.

b. Damaaed or Improper Shipment. Fill out and forward DD Form 6, (Report of Damaged or Improper Shipment) as prescribed in AR 700-58 «Army) ; Navy Shipping Guide, Article 1850-4 (Navy) ; and AFR 71-4 (Air Force».

c. Preventive Maintenance Forms.

(1) Prepare DA Form 11-240 (fig. 5) (Operator First Echelon Maintenance Checklist for Signal Corps Equipment -Telephone Set) in accordance with instructions on the back of the form.

(2) Prepare DA Form 11-241 (fig. 6) (Second and Third Echelon Maintenance Checklist for Signal Corps Equipment -Telephone Set) in accordance with instructions on the back of the form.

Section II. DESCRIPTION AND DATA

3. Purpose and Use

The telephones are used to extend the range and improve the quality of long field wire circuits where it is not feasible to install and maintain repeaters. They are used at terminals (and at intermediate points between terminals) of a 2-wire line. When used in this way, and noise and cross talk conditions permit, the telephones approximately double the transmission range obtained with ordinary local battery sets. Although the telephones are used primarily on field wire circuits, they may be used with other line facilities. The transmission ranges differ with the characteristics of the line. Best results are obtained when a Telephone TP-9 or Telephone Set TA-264/PT is used at each end of the line.

4. Technical Characteristics

Power supply Dry batteries:

One Battery BA-65 (or BA-35), Ph volts.

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One Battery BA-27, 4%volts.

Three Batteries BA-2,

22% volts.

Current drain 255 mao

Number of tubes 4 (1 spare).

Operating temperature -600 F. to 1320 F.

limits.

Frequency range 400 to 3,500 cps.

Power levels:

Transmitting 23 dbm (maximum).

Sidetone -20 dbm to -35 dbm at all

frequencies in the 400 to 3,500 cps range, when output at the line terminals is + 13 dbm into a 600-ohm resistor.

Range 65 db circuits (maximum).

Impedance 600 ohms ±10 percent.

Gain:

Transmitter 15 db.

Receiver 55 db.

3

LATCH

OPERATING INSTRUCTION LABEL

BINDING

POSTS ~~~~_

HANDSET TERMINALS,

TM20!lt

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5. Components

The telephones are self-contained units consisting of a handset, generator, ringer, and amplifiers. A spare tube (3Q5GT/G) is mounted on the tube mounting board. Two technical manuals are provided with each equipment.

6. Description (fig. 2)

a. Each telephone consists of an upper housing, lower housing and a hinged cover. The upper housing mounts all the operating components. The handset and control equipment extend beyond the upper housing and are inclosed by the hinged cover. The amplifier and the batteries extend below the upper housing and are inclosed by the lower housing. The generator crank extends through the side of the upper housing. When not in use, the crank folds into a recess provided for this purpose. When assembled, the telephones are made waterproof by a composition gasket separating the upper and lower housings and by gaskets protecting the openings for the generator crank, binding posts, switches, and controls.

b. Operating power is furnished by batteries located in the lower housing.

c. The telephones are provided with a bell for audible signaling and with a visual signal leaf for noiseless signaling. A switch is provided to select either type of signaling.

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7. Additional Equipment Required

a. The following equipment is not supplied as part of the telephones but is required for operation:

(1) One 4%-volt Battery BA-27 for the transmitter and relay power supply.

(2) Three 22%-volt Batteries BA-2 for the plate voltages.

(3) One llh-~lt Battery BA-65 (or BA- 35) for the filament power supply.

Note. Under normal conditions of intermittent operation, the batteries should last about 3 or 4 weeks. However, this period will vary with climatic and operating conditions.

b. To insure the satisfactory performance of the telephones in temperatures as low as -600 F. when operation of this equipment is essential, substitute the above batteries as follows:

(1) The three Batteries BA-2 with lowtemperature Batteries BA-2002/U.

(2) Battery BA-27 with Battery BA- 2027/U.

(3) Battery BA-65 with Battery BA- 2065/U.

8. Differences in Models

All Telephones TP-9 are similar in purpose, operation, and appearance. Telephones TP-9, serial numbers above 9266 include slight improvements in circuitry and a newer hand ringing generator. Telephone Sets TA-264/PT are similar to the TP-9, serial numbers above 9266.

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CHAPTER 2 INSTALLATION AND OPERATION

Section I. SERVICE UPON RECEIPT OF EQUIPMENT

9. Siting

Select a site close to the base of operations, free from dust, dirt, and excessive moisture. Place the telephone on a convenient work bench or table, near enough to the signal lines so that connections can be made easily.

10. Unpacking

a. Packaging Data. When packed for export shipment, the telephones are placed in a closefitting, water-resistant, fiberboard box sealed with pressure sensitive tape. The tele~hone is adequately cushioned within the fiberboard box. The approximate weight of the packaged units is 19 pounds and displaces about 1,230 cubic inches. Varying quantities of telephones are packed within a nailed wooden box. Shipping containers are reinforced with steel strapping, generally applied girthwise.

b. Removing Contents. Be careful when unpacking equipment. Do not thrust tools into the interior of the shipping container; this procedure

may damage the equipment. Follow the steps given in (1) through (5) below:

(1) Place the packing case on a secure flat surface.

(2) Cut the steel straps.

(3) Remove the nails, using a nail puller, and remove the sides and top of the packing case. Do not pry the sides and top off. This procedure may damage the equipment.

(4) Lift out the corrugated fiberboard box containing the equipment.

(5) Slit the taped seams of the corrugated fiberboard box and lift out the telephone.

11. Checking

a. Check the contents against the packing slip.

b. Examine the equipment carefully for possible damage during shipment.

c. Report damaged equipment in accordance with instructions contained in paragraph 2.

Section II. INSTALLATION

12. Preparation for Use (figs. 3 and 4)

a. Before the telephones can be installed for use, batteries (par. 7) must be installed and connected as outlined in (1) through (10) below.

(1) Unfasten the four screws which hold the upper and lower housings together (fig. 2). Turn the equipment upside down and separate the housings.

(2) Unfasten the two battery clamping frame screws and remove both battery clamping frames (fig. 3).

(3) Install Battery BA-27 in the position shown in figure 3.

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(4) Replace the center battery clamping frame.

(5) Install three Batteries BA-2 and one Battery BA-65 as shown in figure 3. (6) Replace the other battery clamping frame and tighten the battery clamping frame screws.

(7) Disengage the two battery frame hinge pins nearest the row of tubes and swing the battery frame outward, away from the tubes.

(8) Connect the batteries to the battery terminal board as shown in figure 4.

Note. Battery BA-65 has a two-prong connector-plug receptacle. To insure correct

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polarity, be sure that the larger pin of the plug is inserted in the larger hole of the battery receptacle.

Caution: When not using the telephone, lock the cradle switch lever (fig. 2) in the down position or current will be drawn from the batteries. The cradle switch lever may be locked by pushing it down and moving the latch located beneath it to the left.

(9) Swing the frame inward, toward the tubes and re-engage the two battery frame holding pins.

( 10) Put the housings together and fasten the screws. Make sure that the gasket separating the upper and lower housings is free from dirt and grit, and that

there are no nicks in the V -edged facing on the lower housing.

b. Test the amplifiers as follows:

(1) Remove the handset from the cradle (fig. 2).

(2) Turn the GAIN control to the maximum clockwise position.

(3) Release the cradle switch lever by pushing the latch to the right. The cradle switch lever should rise.

(4) Place the telephone receiver to the ear and tap the side of the housing. Microphonic noise should be heard in the receiver. Press the handset switch and blow into the transmitter. Side tone should be heard in the receiver.

BATTERY FRAME

AMPLIFIER CHASSIS

TUBE SOCKET ASSEMBLY

BATTERY CLAMPING FRAME SCREW

BATTERY BA-27

SCREWS (AMPLIFIER CHASSIS)

BATTERY-AMPLIFIER : FRAMEWORK

TM205S-IS ••

Figure 3. Upper housing showing battery installation_

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I- -J
:I: 1&.1
~ >
I I
-J 0 0 :IC 0 :IC ;:) 0 :IC 0
1&.1 1&.1 1&.1 -J 1&.1 -J -J 1&.1 -J 1&.1
> a: a: II) a: II) II) a: II) a: BA-27

o

o

+

BA-65

BA-2

BA-2

BA-2

TM 2059-2

Figure 4. Telephone TP-9 and Telephone Set T A-264/ PT, battery connections.

point, bridge the telephone across the line without interrupting the continuity of the circuit. Strip the insulation from the line wires and make a loop connection to the binding posts. Do not cut the line wires.

13. Connections

To use the telephone at the end of a line, strip the insulation from the end of the line wires and connect the line wires to the binding posts (fig. 2) . To use the telephone at an intermediate

Section III. OPERATION UNDER USUAL CONDITIONS 14. Controls and Control Functions

Control

Funetion

GAIN control Handset switch SIG-BELL switch

Volume control: adjusts volume. of sound heard at the receiver in the handset. Operated, allows speech transmission; unoperated, allows speech reception.

When set at BELL position, provides audible signal; when set at SIG position, provides visual signal.

When held down, provides transmission and reception without amplification; when released, provides transmission and reception with amplification.

Cradle switch lever

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15. Types of Operation

a. The telephones may be used with or without amplification. It is not possible to talk to and hear from the distant station simultaneously. Close cooperation between the talker and listener is necessary for efficient operation.

b. When the telephones are used on a circuit which is connected to a switchboard, a break-in signal (par. 19) may be assumed to be a ring-off signal by the switchboard operator. In this case, it will be necessary to answer the operator's challenge and continue the conversation.

16. Signaling

Turn the generator crank briskly in a clockwise direction to signal another telephone on the line. To receive a signal, set the SIG--BELL switch for the desired type of signal. Set the SIG--BELL switch to BELL for an audible signal; to SIG for a visual signal. If the visual signal is used in darkness, it will be necessary for the operator to note its position by passing his hand over the leaf. The visual signal is a leaf that flies up when ringing current is received.

17. Conversation Without Amplification

To carry on a conversation without amplification, proceed as follows:

a. Remove the handset from the cradle (fig. 2).

b. Lock the cradle switch lever down by pushing the latch to the left.

c. Operate the handset switch and talk into the transmitter.

d. Release the handset switch and listen.

18. Conversation With Amplification

To carryon a conversation with amplification, proceed as follows:

a. Remove the handset from the cradle.

b. Release the cradle switch lever by pushing the latch to the right, allowing the cradle switch lever to rise.

c. Operate the handset switch and talk into the transmitter.

d. Release the handset switch and listen.

e. Adjust the GAIN control to produce the most suitable listening level.

19. Break-in Signal

To interrupt the talker at the distant station, transmit a ringing signal (break-in signal) by turning the generator crank. This will operate the bell or visual signal at the distant station to signal the person talking from the distant station to stop talking immediately and release the handset switch. As soon as the distant station hap stopped talking, operate the handset switch and start talking.

Section IV. OPERATION UNDER UNUSUAL CONDITIONS

freeze. Move equipment to a location in which the grease will thaw. Then clean the generator shaft and gears of grease and relubricate.

20. General

The efficiency of the telephones can be severely affected in regions where extreme cold, heat, moisture, sand conditions, etc., prevail. Paragraphs 21, 22, and 23 contains information on the operation of the telephones under these unusual conditions.

21. Operation in Arctic Climates

Subzero temperatures and climatic conditions associated with cold weather affect the efficient operation of the equipment.

a. Dry-cell batteries lose considerable electrical capacity in low temperatures because of decreased chemical activity, and become unusable. Replace Batteries BA-2, BA-27 and BA-65 with the batteries listed in paragraph 7b.

b. Grease on the generator shaft and gears may

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c. Moisture may form on the transmitter and receiver. Unscrew the bakelite cap and wipe dry.

d. A receiver exposed to very low temperatures may freeze the operator's ear if he uses the receiver in contact with his ear. Protect the handset transmitter and receiver with Microphone Cover CW-111 to prevent frostbite when the operator's ear may come in contact with the cold receiver cap.

22. Operation in Tropical Climates

When operated in tropical climates, the telephone may be installed in tents, huts, or when necessary, in underground dugouts. When equipment is installed below ground and when it is

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set up in" swampy areas, it is subjected to more acute moisture conditions than those that are normal in the tropics. Ventilation is usually poor, and the high relative humidity causes condensation to form on the equipment whenever the temperature becomes lower than the surrounding air. Wipe the handset dry with a dry cloth. A special moistureproofing and fungiproofing treatment has been applied during manufacture and provides 'a reasonable degree of protection.

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23. Operation in Desert Climates

Special dustproofing treatment is not necessary for the telephones. Take all possible precautions to keep dust, dirt, and sand from getting on lubricated parts (Generator GN-38-B). Daily inspection and cleaning of the equipment is recommended. Instead of merely adding new lubricants to the generator, clean and relubricate the equipment whenever practicable.

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CHAPTER 3 ORGANIZATIONAL MAINTENANCE

Section I. FIRST ECHELON (OPERATOR) MAINTENANCE 24. Scope of Operator's Maintenance

This section contains information on maintenance to be performed by the operator. These procedures do not require special tools or test equipment. This maintenance will consist of routine inspections, cleaning, visual checking, and replacement of batteries. Tubes may be replaced only by substituting a new tube.

25. Tools and Materials

The tools and materials necessary to maintain the equipment at this level are cheesecloth or other lint-free cloth and Tool Equipment TE-33. No other tools, materials or test equipment are necessary at this level of maintenance.

26. Preventive Maintenance

a. DA Form 11-240. DA Form 11-240 (fig. 5) is a preventive maintenance checklist to be used by the operator. Items not applicable to the equipment are lined out in the figure. References in the ITEM block in the figure refer to paragraphs which contain additional maintenance information pertinent to the particular item. Instructions for the use of the form appear on the top of the form.

b. Items. The information in this subparagraph is supplementary to DA Form 11-240. The item numbers correspond to the ITEM numbers on the form.

Item Maintenance procedures

1 Remove all kinks from the signal lines and hand-

set cord; inspect the signal line and handset cord for fraying, cuts, and breaks. Report any defects for correction by personnel at higher echelons.

2 Check the signal line connections to the binding

posts. Remake the connections if the signal lines do not make good contact at the binding posts.

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3 Remove dirt, dust, grease, and moisture from the

cord, handset, housings, and battery compartment.

4 Inspect the carrying strap for cuts, tears or fray-

ing. Report any defects for correction by personnel at higher echelons.

5 Remove all corrosion and dead batteries from the

battery compartment (pars. 12 and 27).

6 Signal the distant station; ask them to signal

back. Talk and listen on the circuit and observe transmission quality.

7 Separate the upper and lower housings (par. 12) ;

release the cradle switch lever. Check the tubes for lighted filaments and secure mounting.

8 Same as for item 1 above.



11 Inspect the upper and lower housings for chips,

cracks, corrosion, rust, broken or missing generator handle. Report any defects for correction by personnel at higher echelons. Remove any moisture, mildew, dirt, or grease.

12 Tighten upper and lower housing screws, handset

cord terminal screws on jack assembly, cradle switch lever mounting screw, jack assembly mounting screws, transmitter cap, receiver cap, and cradle screws.

13 Clean the panel markings; remove corrosion.

14 Check the handset for chips or cracks. Report

any defects for correction by personnel at higher echelons. Tighten loose caps. Remove

dirt, grease, moisture. •

15 Examine the snap fastener on the upper housing.

Report any defects for correction by personnel at higher echelons.


17 Inspect the telephone for completeness. One tube

is the only running spare supplied.

18 Check the installation site for coolness and dry-

ness.

27. Equipment Performance Checklist

The equipment performance checklist is used to check equipment performance systematically. All corrective measures which the operator can

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OPERATOR FIRST ECHELON MAINTENANCE CHECK LIST EQUIPMENT NOMENCLATURE rA - 2~4-j,Pr
FOR SIGNAL CORPS EQUIPMENT r£L£l'l-IoN~ SeT'
TELEPHONE SET EQUIPMENT SERIAL. NUMBER
1.233
INSTRUCTIONS - This Cor", is to be used by the operalor 2. The Communication Officer/Chief or his designated repre-
(First echelon) as a daUy preventive maintenance check Ust sentalive will take the following action:
for Signal equipment in actual operation.
1. For detailed preventive maintenance instruction see: a. Enter the designation of equipment.
a. The Technical Manual (in TM 11 series) for the equip- b. Strike oal items that do not apply to the equipment.
menlo (See DA Pamphlet Number 311).4) c. lIand tbis form to the individual checking the equipment.
b. The Supply Dulle lin (S8-II-loo aeries) Cor the eqwp- 3. The individual matine the check will enter in the column
menl (See DA Pamphlet Number 311).4) entitled CONDITION, ill line with the ITEM checked, the
c. The Department of the Azmy Lubrication Order. (See DA proper notation regardine the condition. using the symbols
Pamphlet Number 311).") specified under LEGEND. At the end of the week's opera.
atlon the user will sian this form and hand it to the Com-
munication Officer/Chief.
LEGEND FOR MARKING CONOITIONS:
.( SATISFACTORY )( ADJUSTMENT. REPAIR OR REPLACEMENT REQUIRED ®OEFECT CORRECTED
NR. DAILY CONDITION
ITEM S M T W T F S
I- INSPECT CORDS 11'0,. KINKS. ~RAYING. CUTS. BREAKS. (Outdoor u •• ) ,,/
PAR 26b
2. INSPECT EXTERIO,. CONNECTIONS ~OR SNUG FIT AND GOOD CONTACT. (Outcfool'u •• ) ,/'
PAR 13
3- CL.EAN CORDS. CASES. HANDSIET. AND BATTERY COMPARTMENT O~ MOISTURE. DIRT. ,/'
GRIME •• ••• 111 • • MILDIEW. CORROSION. (Outdoor u •• ) PAR 26b
4. INSPECT FOR SECURE MOUNTING STRAPS. (Outdoor u •• ) ,/
PAR 26b
5. INSPECT BATTERY COMPARTMENT FOR CO''''OSION. GOOD BATTERI.S, BROKEN OR t!)
MISSING SPRINGS. II 8111 (Locel bfltt.ry •• t.), PAR 26b
6- OPERATE THE TELEPHONE AND CHECK FOR PROPER RINGING AND T~LKING. ,/
PAR 26b
7. INSPECT VACUUM TUBES FOR LIGHTED FILAMENTS AND SECURE MOUNTING. ./'
(Amplifl.r typ.). PAR 26b
WEEKLY
NA ITEM C8~ NR ITEM C8~
ION ION
'. INSPECT CORDS ,.OR KINKS. ,.RAYING. CUTS, BREAKS. 14. INSPECT HANDSET ~OR CHIPS, CRACKS. LOOSE CAPS
(Indoor u •• ) PAR 26b 1II1II • ... l1li .... DIRT. GRIEASE. MOISTUR&. PAR 26b
'. INSPECT IEXTERIO .. CONNECTIONS FOR SNUG P'IT AND II. INSPECT SNAP FASTEN .... ON CASIE, (Outdoor u •• )
GOOD CONTACT. (Indoor u •• ) PAR 13 PAR 26b
10. CLEAN CORDS. BATTERY COMPARTMENT, EXTERIOR II. INSPECT ... T ." I. CANVAS ITEMS FOR MILDEW'.
011' CASIE. HOUSING • ....., HANDSIET. (Indoor u •• ). PAR 18 TIEA .... AND ,.RAYING. PAR26b
INSPECT EXTERIOR ~OR CHIPS, CRACKS, CORROSION,
II. RUST. MOISTURE, MILDEW, DIRT, GREASE, BROKEN OR INSPECT TE~EPHONE SET ~OR COMPLETENESS·
MISSING GENERATOR HANDLE. PAR 26b 17. CORDS, ......... HANDSET. BATTERIIES. GENE .. ATORS.
TUBaS. CARRYING CASIES. ACCESSORIES, TECHNICAL.
12. TIGHTEN LOOSE ASSEMBLY AND MOUNTING HARDWARE. MANUALS. RUNNING SPARE PARTs..
PAR 26b PAR 26b
IS. INSPECT MARKINGS FOR LEGIBILITY. CORROSION II. INaPECT ,.OR PROPIER INSTALLATION IN COO~.
PAR 26b DRY PLACE. PAR 9
1'.1~ DIEFICIIENCIES NOTED ARE NOT C'ORRECTED DURING INSPECTION. INDICATIE ACTION TAKIEN FOR CORRECTION. (U •• rev.r •• 11
eddltlo,..' .Pllc. I ....... ,,.CO
I HAVE PEA"ORMED THE REQUIRED MAINTE' I DATE a •• NATURE OF INSPECTOR
NANCE INSPECTION ON THE ITEMS CHECKED
ON THIS "ORM.
e A. :::~.11-240 KDITION OF' MAY II WILL BE USED UNTI~ IEXHAUSTIED * us. GO'IERN .... , PRINTING OFFICE: 1855 0--358465 TM2059-5

Figure 5. DA Form 11-240.

12

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perform are given in the corrective measures column. If the action taken by the operator does not correct the fault, additional maintenance is required by personnel at a higher echelon. The operator should note on the repair tag how the equipment performed and what corrective meas-

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ures were taken. In using the checklist, start at the beginning, following each step consecutively to locate trouble. However, if trouble is suspected in a particular area, start checking at that point and continue the steps sequentially. Operate the equipment as shown in the checklist below.

13

14

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15

Section II. SECOND ECHELON MAINTENANCE

28. Scope of Second Echelon Maintenance

a. The extent of second echelon maintenance is limited by the tools, materials, test equipment, and by the skill of the personnel.

b. Second echelon maintenance for the tele-

phones consists of the following:

(1) Visual inspection (par. 31).

(2) Preventive maintenance (par. 30).

(3) Replacement of defective tubes (par. 32).

(4) Troubleshooting (par. 33).

29. Tools, Materials, and Test Equipment

The tools, materials, and test equipment required for second echelon maintenance are listed below.

a. Tools. Tool Equipment TE-41.

b. Materials. Cleaning cloth.

c. Test Equipment.

(1) Multimeter ME-77/U.

(2) Electron Tube Test Set TV -7 /U.

30. Preventive Maintenance

a. Use of DA Form 11-241. DA Form 11-241 (fig. 6) is a preventive maintenance checklist to be used by the second echelon maintenance personnel. , Items not applicable to the equipment are lined out in the figure. References in the ITEM block in the figure are to paragraphs which contain additional maintenance information pertinent to the particular item. Instructions for the use of the form appear on the back of the form.

b. Items. The information given in this subparagraph is supplementary to DA Form 11-241. The item numbers correspond to the ITEM numbers on the form. Items 1 through 18 are the same as those listed on DA Form 11-240 and described in paragraph 26. Refer to paragraph 26 for maintenance information for these items.


19 Remove all kinks from the signal lines and hand-

set cord; inspect the signal line and handset cord for fraying, cuts, and breaks. Report any defects for correction by personnel at higher echelons.

16


20 Remove dirt, dust, grease, moisture and mildew

from the telephone housings, chassis and battery compartments.

21 Examine all wiring and connections for good con-

tact, breaks, fraying, and cuts. Report any defects for maintenance by personnel at higher echelons.

22 Examine Generator GN-38-B for worn or chip-

ped gears, loose screws or broken contact springs. Report any defects for maintenance by personnel at higher echelons.

23 Generator GN-38-B only; burnish generator con-

tacts.

24 Tighten upper and lower housing screws, hand-

set cord terminal screws on jack assembly, cradle switch lever mounting screw, and jack assembly mounting screws.

25 Operate the SIG-BELL switch, GAIN control,

handset switch, and cradle switch. Check for positive action and good contact. Report any defects for maintenance by personnel at higher echelons.

26 Check the tubes for lighted filaments and secure

mounting.

30 Clean the cradle switch and SIG-BELL switch.

Remove dirt and dust.

31 Clean and tighten the handset cord connections

to the jack assembly; clean and tighten the signal line connections to the binding posts.

31. Visual Inspection

a. When failure is encountered and the cause is not immediately apparent, check as many of the items listed in b below as is practicable' before starting a systematic operational check of the equipment. Do 'not disassemble the telephone for a complete inspection without some knowledge of the operational symptoms. If possible, obtain information from the operator of the equipment regarding performance at the time trouble occurred.

b. Complete or partial failure of the telephone often may be caused by one or more of the following faults:

(1) Improper positioning of operating controls.

(2) Worn, broken, or disconnected signal lines or handset cord.

(3) Broken or loose wires in chassis and jack assembly.

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SECOND AND THIRD ECHELON MAINTENANCE CHECK LIST FOR SIGNAL CORPS EQUIPMENT
. TlLEPllOIIE SET
'ltnaucrr0lt5: .t •• etA., .J4_
£QUIPMENT NOMENCLATURE TA -;U,+/I'r EOUIP'llfIlT SDUlL NO.
-rGLE PHONe sET ;.2.'S
LIGaND POI MAilING CONDITUlIIS: ~ SaUdactorr. I ,wJ "'-at. re,air or r.plac .... ' ... ,alred; e Defect corrected.
Il0l'1: StrU. oat It_ .ot app1!cable.
10 ITEM i~ 10. ITEM ;;0
~;
1 11 INSnCT TEUf'IION[ SET FOR COM'UTEN£SS .. CORDS, I+M6t
INSPECT CORDS FOR KINKS, FRAYING, curS. I.ElKS. tlANDSET, BATT[R IES, GENERATORS, TUBES, CARRYING CASn,
(Outdoor u •• ).
PAR.26b ACCESSORIES, TECKNICAL MANUAlS, RUNNING "AilE ''''RT~llt_ S"fiob
2 11
INSPECT EXTERIOR CONNECTIONS FOft SNUG FIT ANO GOOO I.$I'(CT FOR ",DnA INSTALLATION IN COOL, DRY 'LACE.
CONTACT. (Outdoor ... ).
PAR.I PAR. 9
, CLEAN COADS, CASES, "AHDarr, A .. D ."nEIn COMPU:TN[NT OF 1,
MOISTURE. OIAT, GR'ME, ~ MILDEW, COItRO$IOM. 'NSneT COROS AND LINE TERMINAU fOR fRATlNG, eRUI<S.
CUTS, PROPER CONNECTIONS re. II .... '"A'TIIII
(",-tdoor .... j , PAR.26b PAR.30b
. 2 • CLEAN INTERIORS Of TElEPHONE "OUSINGS, CHASSIS, CARftyiNG
INSnCT fOR SECURE MOUNTING SnAPS. (o.t .... _0). CASU, IIAnERY COMPARTMENTS Of ALL CORROSiON, "OI5TURE,
PAR 26b MILDEW, II:UST, (XCE$S SOLOER, DIII:T, GRIME, GREASE. PAR 30b
, INSPECT UnERY C(lMPARTMENT fOIl: CCIItIlOSIOII, 100II IIATTERIES, 21
IIROKEN OR MIS$ING S,.I_, I RIA III ( .... 1 .. " ... ,. IlIIsnCT INTERIOR WIRING AND CONNECTIONS rOlt 6000 CONTACT,
.. ,.). MEAKS, CUTS, fRAYING •
PAR 26b ,PAR 30b
6 22
OPEItATf THE TE LEPttOllE AltO etlECK FOR ,..OPER lllKi III AlID INSPECT GENERATOR fOR WORN 08 CHIPPED GEARS, LOOSE SCREWS,
TALKING. WCltN IUIIIIER, BROKEN CONTACT SPRINGS. (Loc.l "aU.r,. •• t.).
PAR 26b PAR 30b
1 2,
INSPECT VACUUM TUllES FOIl LIGHTED "LAIIOTS AIG S[CURE BURIilISH GENERATOR CONTACTS AND AOoJUST SPRINGS.
MOUNlING. ("'pUllo" t.",.). (£oeol .o"or,. •• t.).
PAR 26b PAR 67
• ""
INSPECT CORDS fOR KINKS, FRAIU .. , CUTS, IREAMS. TIGHTEN ALL LOOSE ASSEMIILY AND MOUHTING SCREWS.
(,ad_r .... j ,
PAR 26b PAR 30b
, 2, INSPECT III 10"1'1, I IkE I '''II!I, HANDSET lIunERfLY
INSPECT U.TERICR C(JNNECTlOItS fOR SNUG fiT AND GOOD CONTACT.
(illfloor .... j , SWITCH AND CONTROL SWITCHES fOR POSITIVE ACTION AND GOOO
PAR 26b CONTACT. PAR 30b
1. 26
CLEAN CORDS, UnERY COMPARTMENT, UTERIOII Of' CASE, INSPECT VACUUM TUllES fOR SECURE MOUMTING, VISIIlLE CAMAGE,
HOUSIMG,.......r, HANDSET. (I"'.r _0'. AND LIGHTED fiLAMENT. (_,.U/J..r t,.,..). PAR 30b
PAR 26b
11 INSPECT EXTER I~ fOR CHI PS, CRACKS, CORROS ION, RUST, 21
MOISTURE, MilDEW, DIRT, GREASE, IIROKU OR M'SSING I U'" PUll '''I III FlA IIIV' rll I lUI 111'111'
GENERATOR HANDLE. PAR 26b
12 2.
TIGHTEN LOOSE ASSEMIILY AND MOUNTING "ARDWARE. CIS'" P' K' 'MD ucn M2Ig PItT me DIPT n •
-
PAR 26b
1, 29
'''SPECT MARKINGS FOR LEGIBILITY. CORROSION. Ill'"'' A£ .1 • '1I1T1'f 'MIIII III 1iI1. II T IT
PAR 2&b
,. ,.
INSPECT HANDSET fOR CHIPS, CRACIeS, LOOSE CAP'S OR. CAPSULES, ClfAN SWITCHES ~ OF DIRT. DUST AND 1oI0IS1URE.
DIRT, GREASE, "OISTuRE. PAR 26b PAR 30b
" ,1
INSPECT SNAP fASTENER ON CASE. (Outdoor v •• ). ClfAN AND TIGHTEN ALL TERMINAL CONNECTIONS.
PAR 26b PAR30b
16 ,2 lUIIR ICATE THE EQUI P/IIEHT. n II Ii T Ii .. TUT iii T IiIiT III
INSPECT ~ C ..... 'lAS lTEM$ fOR MILDEW, TEARS, TilE RM kU8" 18 "8 J II II!'. PAR 63
AIfD FRAYING. JJ INSPECT THE TELEPHONE SET 'OR PROnR MOISTURE AND FUNGUS
PAR 26b PROOfiNG.
,. IF DEFICIENCIES NOTED ARE NOT CORRECTED DURING INSI'£CTlON. INDICATE ACTION TAKEN FOR. CORRECTION. REPlAtES DA AGO ,ORM n" 1 DEC ~O, WHICH IS OBSOlrt£·

TM2059-6

Figure 6. DA Form 11-241.

17

(4) Defective tubes.

(5) Overheated capacitors.

(6) Burned insulation and resistors.

32. Tube Testing and Replacement

When trouble occurs, check all connections and batteries before removing any tubes. Try to iso- 1ate the trouble to a component or stage. If tube failure is suspected, use the applicable procedure below to check the tubes.

4. Using Tube Tester. Remove and test one tube at a time. Discard a tube only if its defect is obvious or if the tube tester shows it to be defective. Do not discard a tube that tests at or slightly below its minimum test limit. Replace the original tube, or install a new one if required, before testing the next one.

b. Tube Substitution Method. Replace a sus-

18

pected tube with a new tube. If this does not correct the trouble, remove the new tube and put back the original tube. Repeat this procedure with each suspected tube until the defective tube is located.

33. Troubleshooting by Using Equipment Performance Checklist

The equipment performance checklist (par. 27) gives an action or condition, normal indications, and corrective measures information which will help the organizational repairman locate trouble in the equipment. To use this list, follow the items in numerical sequence. When the procedure referred to in the corrective measures column is beyond the scope of organizational personnel, troubleshooting at a field maintenance level is required.

AGO 202M

CHAPTER 4 THEORY

34. General

The telephones are equipped with vacuum-tube amplifiers in both the transmitting and receiving circuits. They can be used without amplification, as local battery sets. The distance over which satisfactory telephone communication can be accomplished is limited by the attenuation of the line, noise, crosstalk, and other interference present in the circuit. To extend the range, a transmitting amplifier is used to apply stronger signals on the line, and thereby provides a more favorable signal-to-noise ratio. To compensate for the losses in the line, amplifiers in the receiving circuit are used. The receiving amplifiers increase the communication range, provided that a good signal-to-noise ratio is maintained.

35. Amplification

a. In the telephones, amplifiers are self-contained. The transmitting circuit uses one stage of amplification; the receiving circuit uses two stages of amplification. To provide a more favorable signal-to-noise ratio, the speech energy originating at the transmitter is amplified and sent out on the line at a comparatively high level (15 decibels referred to 1 milliwatt in 600 ohms (dbm input». The speech energy received at the telephone terminals is amplified through two stages of amplification to provide a maximum gain of approximately 55 decibels (db).

b. Losses caused by the capacitive effects in the line increase at higher frequencies. To overcome these losses, the receiving amplifiers of the telephones are designed to provide greater amplification at higher voice frequencies (fig. 7). In this waY,an equalizing action is obtained which results in a satisfactory overall frequency response characteristic.

c. Transmission of speech energy from both ends of the line simultaneously is not possible when the amplifier is used. The coupling of energy between the transmitting and the receiving amplifiers would cause oscillation and make

AGO 2020A

conversation unintelligible. The handset is equipped with a nonlocking type switch which must be operated for transmission and released for listening. A relay in the telephone is operated by the handset switch and makes the receiving circuit inoperative during transmission, and the transmitting circuit inoperative when speech is being received.

d. The handset rests in a cradle and operates a cradle switch lever. Filament circuits are completed to ground through contacts 11 and 12 of switch SI (fig. 21) when the handset is removed from the cradle and the cradle switch lever is up. When the cradle switch lever is held down (a latch is provided) and the handset removed from the cradle, the telephone is used as a local battery set (without amplification).

36. Local Battery Operation

When the telephone is to be used without amplification (as a local battery set), the cradle switch lever is locked down. This action closes the switch SI contacts 4 and 6 in the transmitting circuit and 7,8, and 10 in the receiving circuit. Contacts 11 and 12 are opened and disconnect the filament voltage from the amplifier tubes.

37. Receiving Circuit Without Amplification (fig. 8)

Incoming speech signals at the binding posts (line terminals) of the telephone flow through contacts 4 and 6 of cradle switch SI, winding 1-3 of transformer Tl, and capacitor C6 to the receiver of the handset. From the receiver in the handset, the currents flow through contacts 7 and 10 of switch SI and capacitor C5B back to the line.

38. Transmitting Circuit Without Amplification (fig. 9)

a. When the handset switch is closed, a complete circuit for Battery BA-27 is formed through winding 2-3 of transformer Tl and winding 1-5

19

Z 40 <I

(l)

CD

o 30

RECEIVER

20

70

~ 'h
/ I I I I ........ <,
/ RECEIVER GAIN
,/ V' ......... <,
..........
V - ---
/
V
/
~

~
I I" TRANSMITTER GAIN
I 60

~o

20

10

2

6

10

14 20 24 30

FREQUENCY IN HUNDREDS OF CYCLES Figure 7. Amplifier gain characteristics.

TM2059-7

C5B

r---,

31 ~I~------------~

I

I

}FROM

BINDING CALLING

POSTS PARTY

TI

TM2059-IO

Figure 8. Receiving circuit without amplification, simplified schematic diagram.

AGO 2020A

of relay K1. Speech currents from the transmitter are induced in windings 2-1 and 3-4 of transformer T1. They are applied to the line from terminal 1 of the transformer through contacts 6 and 4 of switch SI, and from terminal 4 through resistor R4, capacitor C5A, contacts 8 and 10 of switch SI, and capacitor C5B.

b. When the telephone is used without amplification, sidetone is heard in the receiver. The circuit for the sidetone voltage is as follows: transmitter currents are induced in winding 3-4 of transformer T1. These currents flow to the receiver from terminal 3 through capacitor C6, and from terminal 4 through resistor R4, capacitor C5A, and contacts 8 and 7 of switch SI.

39. Transmitting Circuit With Amplification (fig. 10)

a. The transmitting circuit is energized when the handset switch is operated and the cradle switch lever is up (par. 35d). Current for energizing the transmitter is fed from the positive side of Battery BA-27 through the handset switch, the transmitter, winding 5-1 of relay Kl, and winding 3-2 of transformer Tl, to the negative side of Battery BA-27. Relay Kl operates, opens contacts 2-3, and removes the short from winding 1-2 of transformer T2.

b. Speech currents originating in the transmitter flow through winding 3-2 of transformer Tl and are induced in secondary winding 5-6. From the secondary winding of the transformer, the speech currents are applied to the

TRANSMITTER

BA-27 {+

4.5V

~3

I 51

grid of transmitting amplifier tube V1. Primary winding 1-2 of transformer T2 forms the load impedance for tube V1. (On some Telephones TP-9, serial numbers above 5,000, and on Telephone Sets TA-264/PT, a 56,000-ohm resistor (RI3) has been added between terminals 1-2 of transformer T2.) The output from the transmitting amplifier is induced in secondary winding 4-3 of the transformer and applied to the line binding posts through cradle switch SI, transformer T3 and capacitor C5B. Although the energy induced in winding 3-4 of transformer T3 is supplied to the grid of tube V2, the tube has been made inoperative by the operation of relay K1.

c. Sidetone is heard in the receiver when the telephone is being used with amplification and handset switch is operated (closed) . Closed contacts 3-4 of relay Kl allow positive battery to be applied directly to the plate of first receiving amplifier tube V2. This places a short across load impedance network Ll, making the receiving amplifier inoperative. This condition exists as long as the handset switch is held operated. Since the transmitting and receiving amplifiers use a common plate voltage supply, the internal voltage drop in the battery is used to provide sidetone in the receiver. The voltage drop in the battery, caused by the change in current in the transmitting amplifier, is applied to the grid of tube V3, and to the receiver through output transformer T4, and contacts 9 and 7 of switch S1. Bypass capacitor C7 con-

RECEIVER

TI

} TO

BINDING DISTANT

POSTS STATION

R4

4

S1

TM2059-9

Figure 9. Transmitting circuit without ampliji(;ation, simplified schematic diagram.

21

AGO 2020A

BEAM POWER

T4 V3

4 2 3Q5GT/G

r---------------~ r-------.----~

TO PLATE OF r--------- ...... -- BEAM POWERV2

-67.5V

5

TO +67.5V

RECEIVER

PART OF RELAY KI

LI 4

r------,

I I

I I

I I

: II

L _

=

+67.5V

TO DISTANT STATION

4

+1.5V

Figure 10. Transmitting circuit with amplification, simplified schematic diagram.

+67.5V

TM2059-11

trols the amount of sidetone applied to the receiver.

40. Receiving Circuit With Amplification (fig. 11)

a. Relay K1 is not energized when the handset switch is released (for listening). Amplification is applied to the circuit when the cradle switch lever (S1) is up. The transmitting circuit is made inoperative by a short across primary winding 1-2 of transformer T2 through contacts 2-3 of relay Kl. This condition exists as long as the handset switch is released.

b. Incoming speech currents at the line terminals of the telephone flow through capacitor C5B, winding 1-2 of transformer T3, and winding 3-4 of transformer T2. The energy induced

22

in secondary winding 3-4 of transformer T3 passes to the grid of first amplifier tube V2 through GAIN potentiometer R12 and grid resistor R8. Potentiometer R12 controls the gain of the receiving amplifier by varying the loss in the input circuit of tube V2.

c. The network consisting of choke L1 and its capacitor and resistor form the load impedance of tube V2. The parallel circuit formed by choke L1 and the capacitor has a resonant frequency of about 2,200 cycles, and at this point the first stage amplifier has its maximum gain. On either side of this frequency, the gain will decrease as shown in figure 7. This design provides compensation for the line losses over the essential voice frequency bandwidth.

d. The amplified signals from the first stage are coupled to the grid of tube V3 through

AGO 2020A

BEAM POWER

V3

RECEIVER

3Q~GT/G

C4 LI 4

r---'

I I

I L 3

I

i II

L __

+ 67.5v

TO

=~~~R --~----,

VI

BEAM POWER

V2

3Q5GT/G

C58

TM2059-12

R3

C2

R,

Figure 11. Receiving circuit with amplification, simplified schematic dio,gram.

+ 225Y

capacitor C4. The signaR:! are further amplified by tube V3 and are transformer-coupled to the handset receiver by transformer T4. Primary winding 1-2 of transformer T4 forms the load impedance for tube V3. The output signals induced in winding 4-5 of the transformer are applied to the handset receiver through contacts 9 and 7 of cradle switch 81.

e. The power supply for the receiving amplifier consists of a 11h-volt battery (BA-65) which supplies filament voltage to the tubes, and three 221;2-volt batteries (BA-2) which supply plate voltage to the tubes (fig. 21). The negative side of the batteries is grounded through contacts 1, 11, and 12 of switch 81.

Note. The term ground applies to a common return point on the terminal strip in the amplifier chassis.

41. Signaling Circuit (fig. 12)

a. Incoming. Ringer MC-131 is connected to the line through generator contacts 2 and 3 when 8IG-BELL switch 82 is in the BELL position (contacts 2 and 3 of 82 closed). The visual signal indicator is connected to the line

AGO 2020A

through generator contacts 2 and 3 when 8IGBELL switch 82 is in the 8IG position (contacts 1 and 2 of 82 closed). The ringer and the visual signal coils both offer high impedance to voicefrequency currents and low impedance to lowfrequency signaling currents.

b. Outgoing. Outgoing signaling currents, originating within the hand generator when the hand generator crank is turned, are sent out on the line through contacts 1 and 3 of the hand generator. The closing of contacts 1 and 3 simultaneously opens the circuit (contacts 3 and 2 of the generator) to the ringer and the visual signal indicator.

I SIG-BELL I

3

AC

52

Or:r~~T{

STATION

O------4---------------- ~

TM2059-18

Figure 12. Signaling circuit, incoming, simplified schematic dio,gram.

23

CHAPTER 5 FIELD MAINTENANCE

Section I. GENERAL TROUBLESHOOTING INFORMATION

42. General

The first step in servicing a defective equipment is to sectionalize the fault. Sectionalization means tracing the fault to the major component or to the circuit responsible for abnormal operation. The second step is to localize the fault. Localization means tracing the fault to the defective sub chassis; circuit, or stage. Isolation means tracing the fault to the defective part. Some faults such as burned-out relay coils, relay contacts, resistors, etc, often may be isolated by inspection. The majority of faults, however, must be isolated by checking voltages and resistances.

43. Localizing Trouble

a. Troubles in a system in which the telephones are used may occur either in the line wires or in the telephone itself. In general, an indication of the condition of the line and the telephone can be determined to some extent by the ringing signals. If a ringing signal is received, but it is impossible to hear over the circuit, the telephone may be at fault. If no ringing signals or speech signals can be received, the line may be at fault. Noisy operation may occur as a result of trouble in either the line or the telephone.

b. When trouble is encountered, a quick check may be made by changing the telephone to local battery operation (par. 17). This check is especially useful for determining the origin of trouble causing noisy operation, and also for checking the condition of the amplifiers. This check will be satisfactory only when losses in the circuit are not excessive. A more reliable

24

way of testing the telephone is to disconnect it from the line and connect it to a telephone which is known to be in working order. Telephone TA-43/PT or TA-312/PT may be used for this purpose.

c. After the trouble has been localized to either the line or the telephone, proceed to isolate the trouble.

(1) If it has been determined that the line is at fault, report the trouble to wire maintenance personnel.

(2) If the trouble is in the telephone, follow the procedure outlined in the troubleshooting chart (par. 44). To further assist in locating trouble in the telephone, schematic diagrams (figs. 21 and 22), wiring diagram (fig. 23), a point-to-point voltage chart (par. 45), and a resistance chart (par. 46) are supplied.

44. Troubleshooting Chart

The most common troubles that occur in the telephones together with a listing of the probable causes and the corrective action, are given in the following chart. This list of troubles does not represent all the troubles that might occur or all the probable causes for each condition, but does include those which occur in the majority of cases. The probable causes or the items in which the causes may be found are listed under each heading. The references included after the corrective action furnish a cross-reference to paragraphs in other sections of this manual.

AGO 2020A

Symptom

Probable trouble

Correction

Incoming speech signals weak, Line wires_________________ Check signal line connections at binding posts (par.

or no sound heard in re- 13) .

ceiver (with amplification). Report line wire trouble to wire maintenance personnel.

Cradle switch 81 locked in Push latch to unlock cradle switch.

down position.

Batteries weak or dead _

Defective vacuum tubes _

Defective handset and/or cord

Defective relay KL _

Defective cradle switch 8L __

Defective bell or visual signal leaf.

Amplifier circuit _

No speech output, or speech Cradle switch 81 locked in

output weak (with amplifi- down position.

cation). Batteries weak or dead _

Defective vacuum tube ..



Defective cradle switch 8L __

Transmitting amplifier circuit

High noise level prevails Line wires grounded _

(with amplification). Defective vacuum tubes _

Defective batteries _

Loose connections _

Incoming speech signals weak, Line wires _

or no sound heard in re-

ceiver (without amplifica- Cradle switch 81 in unlocked

tion). position.

Defective handset and/or cord Defective cradle switch 8L __

Defective bell or visual signal leaf.

AGO 2020A

Test voltage of batteries with voltmeter. (Test should be made under actual load conditions.) If voltage is less than two-thirds of rated voltage (par. 7), replace batteries.

Test tubes V2 and V3. Replace faulty tubes.

Replace handset (par. 51) and / or cord (par. 52). Check continuity through relay K1. Replace faulty

relay (par. 61).

Check contacts of cradle switch 81. If contacts are defective and cannot be satisfactorily cleaned or adjusted, replace switch (par. 58).

Change setting of 8IG-BELL switch. If speech can come through on new setting, check bell or drop, as the case may be. Replace defective bell (par. 55) or visual signal leaf coil (par. 60).

Make voltage and resistance measurements (pars. 45 and 46). Make any necessary repairs as indicated by v~ltage and resistance measurements.

Push latch to unlock cradle switch.

Test voltage of batteries with voltmeter. (Test should be made under actual load conditions.) If voltage is less than two-thirds of rated voltage (par. 7), replace batteries.

Test amplifier tube VI. Replace tube if necessary. Replace handset (par. 51) and/or cord (par. 52). Check continuity through relay K1. Replace faulty

relay (par. 61).

Check contacts of cradle switch 81. If contacts are defective and cannot be satisfactorily cleaned or adjusted, replace switch (par. 58).

Make voltage and resistance measurements (pars. 45 and 46). Make any necessary repairs as indicated by voltage and resistance measurements.

Report line wire trouble to wire maintenance personnel; Replace each vacuum tube until noise ceases.

Replace batteries.

Check all soldered connections, switch contacts, and relay contacts.

Make any necessary repairs as determined by the above

inspection.

Check line wire connections at binding posts.

Report line wire trouble to wire maintenance personnel. Push cradle switch 81 down; push latch to lock cradle

switch down.

Replace handset (par. 51) and/or cord (par. 52). Check contacts of cradle switch 81. If contacts are defective and cannot be satisfactorily cleaned or adjusted, replace switch (par. 58).

Change setting of 8IG-BELL switch. If speech can come through on new setting, check bell or visual signal leaf, as the case may be. Replace defective bell (par. 55) or visual signal leaf (par. 60).

25

Symptom

Probable trouble

Correction



Push cradle switch SI down; push latch to lock cradle switch down.

Test voltage of battery with voltmeter. (Test should be made under actual load conditions.) If voltage is less than two-thirds of rated voltage (par. 7), replace battery.

Replace handset (par. 51) and/or cord (par. 52). Check continuity through relay K1. Replace faulty relay (par. 61).

Check contacts of cradle switch SI. If contacts are defective and cannot be satisfactorily cleaned or adjusted, replace switch (par. 58).

Report line wire trouble to wire maintenance personnel. Replace battery.

Check all soldered connections, switch contacts, and relay contacts.

Make any necessary repairs as determined by the above

inspection.

Check line wire connections at binding posts.

Report line wire trouble to wire maintenance personnel. Check resistance between binding posts. (Resistance

should be 1,300 ohms.) Replace coils if necessary.

Check the ringer and clapper (par. 66). Check the visual signal leaf.

Check switch contacts on generator.

Adjust if necessary (par. 67). If trouble is not corrected, replace generator (pars. 53 or 54).

Check switch contacts on generator.

Adjust if necessary (par. 67). If trouble is not corrected, replace generator. (pars. 53 or 64).

No speech output, or speech Cradle switeh SI in unlocked

output weak (without am- position.

plification). Battery BA-27 weak or dead.,

Defective cradle switch SL __

High noise level prevails Line wires grounded _

(without amplification). Defective Battery BA-27 _

Loose connections _

Visual signal or bell does not Line wires _

operate, depending on the

setting of the SIG-BELL Defective bell or visual signal switch.

Defective switch on generator

No ringing current Defective generator _

45. Point-to-Point Voltages

The cradle switch lever should be in the released (up) position. Terminal points listed in the From column in the chart below are at a

positive potential. Terminal points listed in the To column are at a negative potential.

Note. Measurements listed below were taken with Multimeter TS-352A/U, using the 20,000-ohm-per-volt scale.

From-

On

To-

On

Remarks

TP-9

I TA-284/PT

3 VI Grd Chassis 65 66
3 VI Grd Chassis Handset switch operated 60 60
4 VI Grd Chassis 65 65
7 VI 6 Tl 2.2 6
2 VI Grd Chassis 1.5 1.5
3 Tl 2 Tl Handset switch operated .1 .1
7 V2 Grd Chassis 1.6 1.5
3 V2 Grd Chassis 42 60
4 V2 Grd Chassis .1 7
7 V2 8 V2 1.32 1.32
7 V3 Grd Chassis 1.5 1.5
3 V3 Grd Chassis 68 60
4 V3 Grd Chassis .6 14
7 V3 8 V3 1.32 1.32 26

AGO 2020A

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<= Ql Ql
0 s:: s::
oS oS C\lC\lC\l ........................ co:>C\l C\l co:> .... C\lC\lC\lC\l .... C\l CO:>.q<co:>.q<.q< ....
p., p., ~~~ »~~~~~> > ~»»>...:l> >~>~~~
r---
~ ..., ...,
rn '"
't:lo't:lo
e s:: p., s:: p.,
i« ~ ~
.q< ........ 00 1.0 10"" C\l CO:> .... 1.0 1.0 co:>t-t-oo.q<co:> .... co:> 1OC\l00.q<.q< .... - c

·0

Q..

I

!

c

·0

0..

AGO 2020A

27

Section II. REMOVAL AND REPLACEMENT

(1) Remove the lower housing (par. 4&). (2) Disengage the two (one on each end) hinge pins nearest the amplifier chassis. Swing the battery frame up on the remaining two hinge pins and away from the tubes.

(3) Disconnect- all battery connections to battery terminal board (if batteries are installed) .

( 4) Disengage the remaining two hinge pins and remove the battery frame.

b. Replacement.

(1) Replace the battery frame by reversing the procedure outlined in a (2) through (4) above.

(2) Replace the lower housing (par. 48b).

47. General

a. Most assemblies of the telephone should be removed before they are dismantled for repairs. This section describes the recommended procedure for removal and replacement of defective parts for the telephone. It does not duplicate information on preventive maintenance contained in paragraphs 24 through 33. Except in cases of extreme emergency, all removal and replacement should be completed by personnel thoroughly trained in telephone maintenance.

b. It may be necessary to unsolder connections to transformers, capacitors, resistors, switches, and the gain control when they are removed and replaced. When replacing apparatus on any of the units, be careful not to drop excess solder on other parts or wiring terminals. Use only rosin-core solder. Avoid aU soldering pastes or acids.

48. Removal and Replacement of Upper and Lower Housing

I t is necessary to remove the lower housing to check, remove, and replace batteries and tubes; to troubleshoot the amplifier circuits of the telephone; and to remove and replace other components of the telephone such as the bell, generator, visual signal leaf coils, switches, capacitors and resistors.

a. Removal.

(1) Place the telephone in the normal up. right position on a work bench or other suitable area.

(2) Loosen the four screws (two in front, one on each side) that hold the two housings together.

(3) Lift the upper housing (which contains all of the components) from the lower housing.

( 4) Place the upper housing on the work bench in an inverted manner (on its top) so that the tubes and batteries are up.

b. Replacement. Replace the housings by reversing the procedure outlined in a above.

49. Removal and Replacement of Battery Frame (fig. 3)

a. Removal.

28

SO. Removal and Replacement of Amplifier Chassis

(fig. 3)

a. Removal.

(1) Remove the lower housing (par. 4&). (2) Remove the (four) screws (two at each end) that hold the amplifier chassis to the battery-amplifier framework attached to the casting. Remove the amplifier chassis.

(3) Move the amplifier chassis aside and unsolder all connections for a complete removal of the amplifier chassis.

b. Replacement.

(1) Replace the amplifier chassis by reversing the procedure outlined in a(2) and (3) above.


51. Removal and Replacement of Handset (fig. 2)

a. Removal.

Note. The handset includes the cord.

(1) Place the telephone in the normal operating position, with the upper housing cover open.

(2) Remove the cord fastener screw from the jack assembly and remove the cord fastener on Telephone Set TA-264/ PT.

AGO 2020A

(3) Untie the stay cord from the fastener on the jack assembly on Telephone TP-9.

( 4) Loosen the three screw terminals on the jack assembly and remove the handset, including cord.

b. Replacement. Replace the handset by reversing the removal procedure outlined in a above.

52. Removal and Replacement of Handset Cord

a. Removal.

(1) Remove the handset and cord (par. 51a).

(2) Unscrew the transmitter cap and remove the transmitter unit.

(3) Loosen the three screws holding the three conductors to the body of the handset.

(4) Remove the cord fastener screw and remove the cord.

b. Replacement. Replace the handset cord by reversing the removal procedure outlined in a above.

53. Removal and Replacement of Generator GN-38-B (TP-9 Only)

(fig. 13)

a. Removal.

(1) Remove the lower housing (par. 48a) and move the battery frame (par. 49a(2».

(2) Remove the amplifier chassis (par. 50a(2». Move the amplifier chassis aside gently, so as not to break any wires.

(3) Remove the four screws which hold the generator to the top of the upper housing.

(4) Move the generator to one side and disengage the clutch plate which connects the armature shaft to the generator crank.

(5) Lift the generator out of the housing. (6) Remove the three screws which hold the terminal lugs to the generator. These are the only connections on the generator.

Note. It is not necessary to remove the

AGO 2020A

waterproof bearing which holds the shaft of the generator crank when removing the generator.

b. Replacement.

(1) Replace the generator by reversing the removal procedure outlined in a(3) through (6) above. Using an ohmmeter, check to see that the generator frame is not grounded to the housing.

Caution: Do not tighten the screws too tightly. The threads in the aluminum castings are easily stripped.

(2) Replace the amplifier chassis (par. 50b (1».

(3) Replace the battery frame (par. 49b (1».


54. Removal and Replacement of Generator G-42/PT (TA-264/PT Only)

a. Removal.

(1) Remove the lower housing (par.48a) and move the battery frame (par. 49a(2».

(2) Remove the amplifier chassis (par. 50a(2». Move the amplifier chassis aside gently, so as not to break any wires.

(3) Unsolder the leads from terminals 1, 2, and 3 on the generator.

(4) Remove the screw and washer from the center of the generator hand wheel. Remove the generator hand wheel.

(5) Remove the mounting nut and washer that secure the generator to the housing.

(6) Slide the generator away from the mounting portion of the housing and remove it from the housing.

b. Replacement.

(1) Replace the generator by reversing the removal procedure outlined in a(3) through (6) above.


(3) Replace the battery frame (par. 49b(1» .


29

GENERATOR CLUTCH PLATE

UTTERY "RAME

JACK ASSEMBLY TfRMINAL SCREWS

VISUAL SIGNAL LEA" COILS

Figure 13. Telephone TP-9, battery frame and amplifier chassis swung outward.

55. Removal and Replacement of Ringer MC-131

(fig. 13)

a. Removal.


(2) Remove the amplifier chassis (par. 50a (2».

(3) Remove the two screws which hold the ringer to the upper housing. Lift the ringer out of the housing.

(4) Unsolder the wires connected to the ringer.

b. Replacement.

(1) Replace the ringer by reversing the removal procedure outlined in a(3) and (4) above.

30




56. Removal and Replacement of SIG-BELL Switch

(figs. 2 and 13)

a. Removal.

( 1) Place the telephone in the normal operating position, with the upper housing cover open.

(2) Loosen the setscrew in the knob on the front panel and take the knob off (fig. 2).

(3) Remove the nut (on the front panel) which holds the switch to the housing.

AGO Z020A

Use a crescent wrench to remove this nut, not pliers.

(4) Remove the lower housing (par. 4Sa) and move the battery frame (par. 49a(2».

(5) Remove the amplifier chassis (fig. 13 and par. 50a (2) ).

(6) Carefully pull the SIG-BELL switch out of the housing.

(7) Unsolder the three connections.

b. Replacement.

(1) Solder the three connections to the proper terminals.

(2) Replace the SIG-BELL switch in the housing. While holding the switch in place, install the nut (on the front panel) which holds the switch to the housing.



(5) Replace the lower housing (par.4Sb). (6) Replace the knob on the switch and tighten the setscrew.

57. Removal and Replacement of GAIN Control

(figs. 2 and 13)

a. Removal. Remove the GAIN control by following the procedures given for the removal of the SIG-BELL switch (par. 56a).

b. Replacement. Replace the GAIN control by following the procedures given for the replacement of the SIG-BELL switch (par. 56b).

58. Removal and Replacement of Cradle Switch

(figs. 2 and 13)

a. Removal.

(1) Place the telephone in the normal operating position, with the upper housing cover open.

(2) Remove the two screws which hold the cradle and latch to the housing (fig. 2). Remove the cradle and latch.

(3) Remove the cradle switch lever setscrew. Pull the lever off the shaft.

(4) Remove the nut (on the front panel) which holds the switch to the housing. Use a crescent wrench to remove this nut, not pliers.

AGO 2020A

(5) Remove the lower housing (par. 4&) and move the battery frame (par. 49a(2».

(6) Remove the amplifier chassis (fig. 13 and par. 50a (2) ) .

(7) Carefully pull the cradle switch out of the housing. On Telephones TP-9, the cradle switch can be pulled out from the housing much easier if Generator GN-38-B is removed first (par. 53a).

(S) Unsolder the connections.

b. Replacement.

(1) Solder all connections.

(2) Replace the cradle switch in the housing. While holding the switch in place, install the nut (on the front panel) which holds the switch to the housing. On Telephone TP-9, if the generator has been removed, replace the generator (par. 53b).



(5) Replace the lower housing (par.4Sb). (6) Place the telephone in the normal operating position, with the upper housing cover open.

(7) Replace the cradle switch lever on the shaft. Tighten the lever setscrew.

(S) Replace the cradle and latch on the housing. Tighten the screws.

59. Removal and Replacement of Jack Assembly (figs. 2 and 13 )

a. Removal.

(1) Place the telephone in the normal operating position, with the upper housing cover open (fig. 2) .

(2) Remove the cord fastener screw and remove the cord fastener on Telephone Set 'rA-264/PT. Untie the stay cord from the fastener on Telephone TP-9 and remove (by unscrewing) the fastener.

(3) Remove the four screws from the jack cover. Remove the cover.


(5) Place the telephone on its back.

31

(6) Hold each of the (three) screws (fig. 13), on the underside of the housing, stationary while removing the (three) screws from each of the (three) spring contacts on the top of the jack assembly.

(7) Remove the jack assembly.

b. Replacement.


(2) Place the jack assembly in position on the housing.

(3) Insert the (three) screws in the underside of the housing (fig. 13) .

(4) Insert the (three) screws through the spring contacts, through the (top of) jack assembly, and into the three screws which have been inserted in the underside of the housing. Tighten the screws.

(5) Replace the battery frame (par. 49b (1» and lower housing (par. 4Sb). (6) Place the telephone in the normal operating position, with the upper housing cover open (fig. 2) .

(7) Replace the jack cover with the (four) screws.

(S) Replace the stay cord fastener and stay cord on Telephone TP-2. Replace the cord fastener and cord on Telephone Set TA-264/PT.

60. Removal and Replacement of Visual Signal . Leaf Coils

(fig. 13)

a. Removal.

(1) Remove the lower housing (par. 4Sa). (2) Remove the amplifier chassis (par. 50a(2» .


(4) With the visual signal leaf in the re-

leased position, remove the two magnet bolts.

(5) Withdraw the coils as far as possible and unsolder the connections.

b. Replacement.

(1) Solder the three connections to the proper terminals.

(2) With the telephone on its back, replace the coils with the two magnet bolts.



61. Removal and Replacement of Relay, Choke Coil, and Transformers

a. Removal.

(1) Remove the lower housing (par. 48a). (2) Remove the amplifier chassis (par. 50a(2».

(3) Loosen the two screws (one at each end) located on top of the amplifier chassis which holds the tube socket assembly to the amplifier chassis.

(4) Open the tube socket assembly on its hinge pins to reach the amplifier components.

(5) Remove the two nuts to withdraw the relay; remove the two screws to withdraw any transformer or the choke coil. (6) Unsolder the connections and remove . the component .

b. Replacement.

(1) Replace the relay, transformers, or choke coil by reversing the removal procedure outlined in a(3) through (6) above.



Section III. LUBRICATION AND ADJUSTMENTS

62. Recommended Lubricants

In general, lubrication as a field service is not required. The moving parts of Generator GN- 42/PT (Telephone Set TA-264/PT) have been lubricated during manufacture and do not require subsequent lubrication. However, when Telephone TP-9 is in a repair station for recondition-

32

ing, Generator GN-38-B should be lubricated before it is put back in service. The only lubricants recommended for the telephones are-

a. Oil, lubricating, preservative, special, Ordnance Stock No. 14-0-2834-10 (1 qt can).

b. Grease, aircraft and instruments, Federal Stock No. ,9150-261-8297 (S oz container).

AGO 2020A

63. Detailed Lubrication Instructions (fig. 14)

The points to be lubricated, the type of lubricant to be used, and the quantity to be applied are listed in b below. Item numbers shown in figure 14 correspond with the item numbers listed in the chart below.

a. Cleaning. Clean all dirt and grease from bearings and gear surfaces. Use a cloth or brush

moistened with Cleaning Compound (Federal Stock No. 7930-395-9542). Do not allow cleaning fluid to enter the armature coil.

b. Lubrication. Lubricate all points indicated in figure 14. Never use an excess of lubricant. The generator is mounted upside down in the housing of the telephone and excess lubricant will run down into the telephone. Apply lubricants as follows:

Item No.

Name of part

Lubricant

Method and quantity

1 2 3 4 5 6 7

Crank shaft bearings I Oil

Crank shaft drive gear ~______________________ Grease

Crank hinge and shaft____________________________________ Oil

Crank cam . Grease

Armature drive pinion gear Grease

Armature shaft bearing (left) Oil

I Armature shaft bearing (right) ---------------------------- Oil

lor 2 drops Thin film

2 or 3 drops Thin film Thin film lor 2 drops lor 2 drops

TM2059-14

1 Crank shaft bearings

2 Crank shaft drive gear 3 Crank hinge and shaft 4 Crank cam

5 Armature drive pinion gear

6 Armature shaft bearing (left) 7 Armature shaft bearing (right)

Figure 14. Lubrication points, Generator GN-38-B.

AGO 2020A

7

64. General Adjustment Instructions

All parts of the telephone are adjusted in production and should not require adjustment in normal field use. If adjustments are necessary, however, follow the instructions in paragraphs 65 through 67.

65. Visual Signal Leaf Adjustment (fig. 15)

a. Requirement. The spring tension on the visual signal leaf should be adjusted so that the leaf will just barely be held in place by the magnet. If this condition is not met, weak ringing currents will not operate the visual signal.

b. Method of Checking. Operate the visual signal leaf by hand several times to check this requirement.

c. Adjustments. Release the visual signal leaf by hand, and hold the leaf close to the magnet bolts. Loosen the nut on the end of the adjusting screw. Turn the adjusting screw to regulate the tension on the spring to meet the requirement, Tighten the nut on the end of the adjusting screw.

66. Ringer MC-131 Adjustment (fig. 16)

Remove the ringer (par. 55a). a. Requirements.

33

ADJUSTING SCREW

SPRING

VISUAL SIGNAL LEAF (RELEASED POSITION)

NUT

Figure 15. Visual signal leaf adjustment.

TM2059-16

(1) The magnet should pull the clapper back toward the gong projection when the clapper is moved manually away from the gong projection and released.

(2) The clapper should strike each gong projection equally.

(3) There should be some clearance, not to exceed .020 inch between the clapper and each gong projection.

(4) The travel of the clapper should be sufficient (to strike each gong projection) yet not excessive (so that it rests against the gong projection).

b. Method of Checking. Manually move the clapper to check all of the requirements in a above.

c. Adjustments.

(1) If the requirement in a (1) above is not met, the magnet is weak and must be replaced. The magnet is part of the coil; therefore, the coil must be replaced.

34

Remove the gong from the ringer bracket. Remove the coil by removing the screw holding it to the ringer bracket and unsoldering the two connections. Replace with a new coil by reversing the procedures outlined above.

(2) Loosen the two gong clamping screws and rotate the gong until the clapper strikes each gong projection equally.

(3) Loosen the two nuts that secure the armature pivot bracket to the ringer bracket. Increase or decrease the armature travel to meet the requirement. Tighten the two nuts.

(4) Perform the adjustment given in (3) above to meet this requirement. Replace the ringer (par. 55b).

67. Generator GN-38-B Adjustments (fig. 17)

a. Requirements.

(1) The contact pressure of the lower

AGO 2020A

GONG PROJECTION

ARMATURE

RINGER BRACKET

CLAPPER

CLEARANCE NOT

TO EXCEED .020 INCHES

ARMATURE ADJUSTING NUTS

Figure 16. Ringer adjustment.

TM2059-15

spring against the end of the armature should be at least 100 grams (3.5 oz) .

(2) The clearance between the two upper springs should be at least .035 inch.

(3) The clearance between the buffer on the crankshaft and the nearest spring should be at least .025 inch when the shaft is in its normal position ..

AGO 2020A

(4) When the shaft is in the cranking position, the contact pressure between the two upper springs should be between 75 grams (2.6 oz) and 125 grams (4.4 oz).

b. Adjustments. All of the above requirements in a above are met by adjusting the springs by bending them.

35

UNOPERATED CONDITION

UPPER SPRING

CRANKSHAFT

LOWER SPRING

1--- .. 100 GRAMS (3.50Z)

OPERATED CONDITION

TM2059-17

Figure 17. Genemtor GN-88-B, contact spring adjustments.

Section IV. FINAL TESTING

68. Purpose of Final Testing

The tests described in this section are designed to measure the performance capability of a re-

paired equipment. Equipment that meets the minimum standards stated in the tests will furnish satisfactory operation.

36

AGO 2020A

69. Test Equipment Required for Final Testing The following equipment is required for final testing of the telephones:

Test equipment

I Technical manual

Telephone Test Set AN/PTM-6 TM 11-2062.

Test Set TS-140/PCM TM 11-2096.

Electron Tube Test Set TV-2/U TM 11-2661.

Attenuator TS-402/U TM 11-2044.

Impedance matching transformer

(Federal Stock No. 5950-570-5614).

70. Handset Test

a. Transmission. Connect the transmitter line terminals (red and black leads) to the L1-L2 jack on Telephone Test Set AN/PTM-6. Set control D1 at 3, D3 at 3, D5 at 1, and the equalizer to the IN position. Precondition and locate the transmitter element in accordance with paragraph 24b (1) and (2), TM 11-2062. Operate key 1 to LBPE, key 2 to RCT, key 7 to AC, and key 8 to TRANS. Operate the handset switch, then depress key 9. The reading of the meter M1 should be to the right of -6 db. There should be no output when the handset switch is released.

b. Reception. Connect the receiver line termi-

I

nals (red and white leads) to the L1-L2 jack on

Telephone Test Set AN/PTM-6. Set control D2 at 2, D4 at 6,. D5 at 1, and the equalizer to the OUT position: Locate the receiver element in accordance with paragraph 24c (1), TM 11-2062. Operate key 1 to LBPE, key 2 to RCT, key 7 to AC, key 8 to REC. Depress key 9. The reading of meter M1 should be to the right of -4 db.

71. Generator, Ringer, and Insulation Tests

Note. All paragraph references contained herein are to TM 11-2062, unless otherwise indicated.

a. Generator Test. Test the generator in accordance with paragraph 29. Turn the generator crank at approximately 200 revolutions per minute; the deflection of meter M1 should be to the right of 0 db.

b. Ringer Test. Test the ringer in accordance with paragraph 30b. Set control D5 at 1. Test Ringer MC-131 with the SIG-BELL switch in the BELL position and the visual signal leaf indicator with the SIG-BELL switch in the SIG position.

AGO 2020A

c. Insulation Resistance Test. Test the insulation in accordance with paragraph 31. The insulation resistance test must be made with the handset cord and handset switch wired to the handset, but with the transmitter and receiver units removed. The deflection of meter M1 should be to the left of -6 db.

72. Amplifier Test (fig. 18)

An ear test for sound volume and tone quality is the usual procedure for determining approximate amplifier gain and frequency response. However, where a more accurate and dependable test is required, proceed as described in a and b below.

a. Transmitting Circuit.

(1) Install the batteries required for operation (par. 12).

(2) Disconnect the handset; allow the cradle switch lever to rise.

(3) Connect Test Set TS-140/PCM and the impedance matching transformer as shown in A, figure 18. Refer to TM 11-2096 for complete instructions on use of the TS-140/PCM.

(4) A signal input of -10 dbm as indicated on the meter of Signal Generator SG- 15/PCM should produce an output on Decibel Meter ME-22/PCM for the corresponding frequency as indicated below:

Frequency (cycles per second)

TP-9 (serial No. below 9267)

Minimum output (dbm)

TP-9 (serial No. above 9266) and TA-264/PT

400 1,000 2,000 3,500

+2 +5 +8 +8

-2 +1 +4 +4

b. Receiving Circuit.

(1) Perform steps in a(l) and (2) above. (2) Set the GAIN control for maximum gain.

37

(3) Connect Test Set TS-140/PCM and Attenuator TS-402/U as shown in B, figure 18. Refer to TM 11-2044, Attenuators TS-402/U and TS-402A/U, for complete instructions on use of TS- 402/U.

(4) A signal input of -70 dbm should produce an output on Decibel Meter ME- 22/PCM for the corresponding frequency as indicated below-

Frequency (cycles per second)

-35

-13

-8

-16

Minimum output (dbm)

400 1,000 2,000 3,500

(5) A signal input of -10 dbm at 1,000 cycles per second should produce an output of -10 dbm, plus or minus -4 db.

0 TA-264/PT

SIGNAL 0 6 7 8~ OR DECIBEL
GENERATOR [;5 TP-9 METER
SG-15/PCM I~l V-BINDING ME-221PCM
L T POSTS
02 II -OC ~
!i 120 ~
OR .....

PART F IMPEDANCE F ( 0

TS -140/PCM)

MATCHING TRANSFORMER (STRAP AS SHOWN)

(PART 0 TS-140/PCM)

A

TA-264/PT
SIGNAL OR DECIBEL
GENERATOR ATTENUATOR TP-9 METER
TS-402lU
SG-15/PCM BINDING~ TO ME- 22/PCM
POSTS
~ ..... r--.... C
~ R

(PART OF (PART OF TS-140/PCM)

TS - 140/PCM) B TM2059-20

Figu1'e 18. Amplifier test setup.

38

AGO 2020A

CHAPTER 6

SHIPMENT AND LIMITED STORAGE AND DEMOLITION TO PREVENT ENEMY USE

Section I. SHIPMENT AND LIMITED STORAGE

73. Disassembly of Equipment

To disassemble the telephone for shipmeuj;· or storage, proceed as follows:

a. Remove the signal line connections and all batteries from the battery compartment.

b. Mount the handset inside the cover to prevent it from shifting during shipment. Close the cover.

74. Repacking for Shipment and Limited Storage

The exact procedure for repacking depends on the material available and the conditions under which the equipment is to be shipped or stored. Use the original shipping container (par. 10) or a suitable substitute. Reverse the unpacking instructions (par. 10).

Section II. DEMOLITION OF MATERIEL TO PREVENT ENEMY USE

75. Authority for Demolition

Demolition of the equipment will be accomplished only upon the order of the commander. The destruction procedures outlined in paragraph 76 will be used to prevent further use of the equipment.

76. Methods of Destruction

Use any of the following methods to destroy the equipment:

a. Smash. Smash the controls, tubes, switches, capacitors, and transformers; use sledges, axes, handaxes, pickaxes, hammers, or crowbars.

AGO 2020A

b. Cut. Cut the handset cord and all other wiring; use axes, handaxes, or machetes.

c. Burn. Burn the handset cord and technical manuals; use gasoline, kerosene, oil, flame throwers, or incendiary grenades.

d. Bend. Bend the upper housing and cover.

e. Explode. If explosives are necessary, use firearms, grenades, or TNT.

f. Dispose. Bury or scatter the destroyed parts in slit trenches, fox holes, or throw them into streams.

39

RESISTOR COLOR CODE MARKING (MIL-STD RESISTORS)

AXIAL-LEAD RESISTORS (INSULATED)

'-----FIRST SIGNIFICANT FIGURE

RC-COMPOSITION

SECOND SIGNIFICANT FIGURE

'-----IFIR~ST SIGNIFICANT FIGURE (DOUBLE WIDTH SIGNIFIES FIXED WIRE-WOUND RESISTORS)

RU-WIRE-WOUND

RADIAL-LEAD RESISTORS (UNINSULATED)

(END) TOL

(BODY)

BAND A OR BOOY* BAND B OR ENO* BAND C OR ~OT OR BANO* BAND 0 OR ENO*
FIRST SECOND RESISTANCE
COLOR SIGNIFICANT COLOR SIGNIFICANT COLOR MULTIPLIER COLOR TOLERANCE
FIGURE FIGURE (PERCENT)
BLACK 0 BLACK 0 BLACK I BODY "! 20
BROWN I BROWN I BROWN 10 SILVER ±'O
RED 2 RED 2 RED 100 GeLD "!5
ORANGE 3 ORANGE 3 ORANGE 1,000
YELLOW 4 YELLOW 4 YELLOW 10,000
GREEN 5 GREEN 5 GREEN 100,000
BLUE 6 BLUE 6 BLUE 1,000,000
, PURPLE 7 PURPLE 7
(VIOLET) (VIOLET)
GRAY B GRAY B GOLD 0.1
WHITE 9 WHITE 9 SILVER 0.01 MUL TIPLIER (DOT OR BAND)

T SIGNIFICANT FIGURE

RZ-COMPOSITION

* FOR WIRE-WOUND-TYPE RESISTORS, BAND A SHALL BE DOUBLE-WIDTH.

WHEN BODY COLOR IS THE SAME AS THE DOT (OR BANDl OR END COLOR, THE COLORS ARE DIFFERENTIATED BY SHADE, GLOSS, OR OTHER MEANS.

EXAMPLES (BAND MARKING); EXAMPLES (BODY MARKING):

10 OHMS :!:20 PERCE NT: BROWN BAND A; BLACK BAND B; 10 OHMS ± 20 PERCENT: BROWN BODY; BLACK END; BLACK DOT

BLACK BAND C; NO BAND D. OR BAND ~ BODY COLOR ON TOLERANCE END.

4.7 OHMS:!:S PERCENT: YELLOW BAND A~ PURPLE BANDB; 3,000 OHMS :!:IO PERCENT: ORANGE BODY; BLACK END; RED DOT

GOLD BAND C; GOLD BAND D. OR BAND; SILVER END. STD-R I

Figure 19. MIL-STD resistor color code marking.

40

(END) TOLER

SIGNIFICANT FIGURE

RZ-COMPOSITION

RESISTOR COLOR CODE

AGO 2020A

CAPACITOR COLOR CODE MARKING (MIL-STD CAPACITORS)

FIRST SIGNIFICANT FIGURE TEMPERATURE--------, COEFFICIENT INNERELECTRODE TERMINAL

TEMPERATURE--------~ COEFFICIENT

INNER-ELECTRODE TERMINAL

NOTE:

o

SPOTS MAY BE USED INSTEAD OF BANDS; TEMPERATURE COEFFICIENT MARKING IS LAttGER.

CERAMIC-TEMPERATURE COMPENSATING (CCI

CHARACT~RISTIC FIRST SIGNIFICANT FIGURE SECOND SIGNIFICANT FIGURE II DECIMAL MULTIPLIER

MIL IDENTIFIER CAPACITANCE TOLERANCE

(BLACK SPOT)

NOTES:

I. SPOTS MAY BE USED ON TUBULAR CAPACITORS; CHARACTERISTIC SPOT IS LARGER AND MIL IDENTIFIER IS ON SIDE DIAMETRICALLY OPPOSITE COLOR SPOTS.

2. MIL IDENTIFIER OF DISK TYPE IS ON REVERSE SIDE; CHARACTERISTIC SPOT IS LARGER OR SPACE BETWEEN CHARACTERISTIC AND TOLERANCE SPOTS IS THREE TIMES SPACE BETWEEN ADJACENT SPOTS.

3. TOLERANCE: YELLOW, + 100%, -20%.

CERAMIC-GENERAL PURPOSE (CKI

CAPACITOR COLOR CODE

MULTIPLIER CHARACTERISTIC I TOLERANCE 2 TEMPERATURE
COEFFICIENT
COLOR SIG NUMBER CC (UUF/UF/·C)
FIG. DECIMAL OF CM CN CB CK CM CN CB
ZEROS OVER IOUUF CC
IOUUF OR LESS
BLACK 0 I NONE A 20 20 20 20 2 ZERO
BROWN I 10 I B E B W I -30
RED 2 100 2 C H X 2 2 2 -80
ORANGE 3 1,000 3 D J 0 30 -150
YELLOW 4 10,000 4 E P -220
GREEN 5 5 F R 5 0.5 -330
BLUE 6 6 S -470
PURPLE 7 7 T W -750
(VIOLETI
GRAY 8 B X 0.25 +30
10 I -330("t5001 3
WHITE 9 9
GOLD 0.1 5 5 +100
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2. IN PERCENT. EXCEPT IN UUF FOR CC-TYPE CAPACITORS OF 10 UUF OR LESS.

3. INTENDED FOR USE IN CIRCUITS NOT REQUIRING COMPENSATION.

Figure 20. MIL-STD capacitor color code marking.

AGO 2020A

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III

INDEX

Paralfraph Palfe Paralfraph PSlfe
Additional equipment required __________ 7 5 Demolition, authority __________________ 75 39
Adjustment instructions, generaL _______ 64 33 Description ___________________________ 6 5
Adj ustments : Desert climates, operation ______________ 23 10
Generator GN-38-B _______________ 67 34 Destruction, methods ___________________ 76 39
Ringer MC-13L ___________________ 66 33 Detailed lubrication instructions _________ 63 33
Visual signal Ieaf , _________________ 65 33 Differences in models ___________________ 8 5
Amplification: Disassembly of equipment, shipment 73 39
Conversation with (operation) ______ 18 9 and limited storage.
Conversation without (operation) ___ 17 9
Theory: Equipment, disassembly, shipment 73 39
General ______________________ 35 19 and limited storage.
Receiving circuit with __________ 40 22 Equipment performance checklist . _______ 27 11
Receiving circuit without., ______ 37 19 Equipment required, additional _______ 7 5
Transmitting circuit with _______ 39 21 Final testing:
Transmitting circuit without; ___ 38 19 Amplifier ______________________ 72 37
Amplifier chassis, removal and replace- 50 28 Generator ________________________ 71 37
ment. Handset __________________________ 70 37
Amplifier test, finaL ___________________ 72 37 Insulation ________________________ 71 37
Arctic climates, operation ______________ 21 9 Purpose __________________________ 68 36
Authority for demolition ________________ 75 39 Ringer ___________________________ 71 37
Battery frame, removal and replacement.... 49 28 Test equipment required ____________ 69 37
Battery operation, 10caL ________________ 36 19 Forms and records _____________________ 2 3
Break-in signaL _______________________ 19 9 Function, controls _____________________ 14 8
Characteristics, technicaL ______________ 4 3 Gain control, removal and replacement , ___ 57 31
Charts: General:
Point-to-point resistance ____________ 46 27 Adjustment instructions ____________ 64 33
Point-to-point voltages _____________ 45 26 Removal and replacement; __________ 47 28
Troubleshooting ___________________ 44 24 Theory ___________________________ 34 19
Chassis, amplifier, removal and replace- 50 28 Troubleshooting ___________________ 42 24
ment. Unusual operation _________________ 20 9
Checking ______________________________ 11 6 Usual operation ___________________ 15 9
Checklist, equipment performance ________ 27 11 Generator, final test , ___________________ 71 37
Choke coil, removal and replacement., _____ 61 32 Generator GN-38-B, adjustments _______ 67 34
Circuits: Generator, removal and replacement:
Receiving, with amplification ________ 40 22 G-42/PT ------------------------- 54 29
Receiving, without amplification _____ 37 19 GN-38-B _________________________ 53 29
Signaling _________________________ 41 23
Transmitting, with amplification ____ 39 21 Handset cord, removal and replacement ___ 52 29
Transmitting, without amplification __ 38 19 Handset, removal and replacement; ______ 51 28
Climates, operation: Handset test, final _____________________ 70 37
Arctic ____________________________ 21 9 Housings, removal and replacement; _____ 48 28
Desert ____________________________ 23 10 Inspection, visuaL _____________________ 31 16
Tropical __________________________ 22 9 Instructions, adjustment, generaL _______ 64 33
Coils, removal and replacement __________ 60 82 Insulation test, finaL __________________ 71 37
Components ___________________________ 5 5
Connections ___________________________ 13 8 Jack assembly, removal and 59 31
Controls and control functions ___________ 14 8 replacement.
Conversation with amplification _________ 18 9
Conversation without amplification ______ 17 9 Leaf adjustment, signal; _______________ 65 33
Cord, handset, removal and replaeement.,., 52 29 Limited storage, repacking ______________ 74 39
Cradle switch, removal and replacement; __ 58 31 Local battery operation _________________ 86 19
AGO 2020A 45 Par ...... ph

Localizing trouble 43

Lower housing, removal and 48

replacement.

Lubricants, recommended_______________ 62

Lubrication instructions, detailed 63

Maintenance:

Preventive (operator's)_________ __ 26

Preventive (second echelon) 30

Scope of operator's________________ 24

Scope of second echelon_____________ 28

Materials:

And tools (operator's)_______________ 25

Tools and test equipment (second 29

echelon).

Methods of destruction_________________ 76

Models, differences_____________________ 8

Operation:

Arctic climates____________________ 21

Break-in signaL------------------- 19

Conversation with amplification_____ 18

Conversation without amplification.L. 17

Desert climates____________________ 23

General__________________________ 15

Local battery 36

Signaling ---------------- 16

Theory:

Amplification__________________ 35

GeneraL_____________________ 34

Local battery------------------ 36

Receiving circuit with 40

ampJitica t iou.

Receiving circuit without 37

amplification.

Signaling circuiL______________ 41

Transmitting circuit with 39

amplification.

Transmitting circuit without 38

amplification.

Tropical climates__________________ 22

Types______________________________ 15

Operator's:

Maintenance, scope---------------- 24

Preventive maintenance____________ 26

Tools and materials 25

Performance checklist, equipmenL_______ 27

Point-to-point resistance values__________ 46

Point-to-point voltages__________________ 45

Preparation for use____________________ 12

Preventive maintenance (operator's)_____ 26

Scope____________________________ 24

Tools and materials________________ 25

Preventive maintenance (second 30

echelon) .

Scope____________________________ 28

Tools, materials and test equip- 29

ment.

Purpose and use_______________________ 8

Purpose of final testing_________________ 68

46

Paa-e

24 28

Paragraph

Receiving circuit with amplification 40

Receiving circuit without amplifi- 37

cation.

Recommended lubricants________________ 62

Records and forms_____________________ 2

Relay, removal and replacement 61

Removal and replacement:

Amplifier chassis__________________ 50

Battery frame______________ 49

Choke coil________________________ 61

Cradle switch_____________________ 58

GAIN controL____________________ 57

General__________________________ 47

Generator G-42/PT________________ 54

Generator GN-38-B________________ 53

Handset__________________________ 51

Handset cord______________________ 52

Jack assembly_____________________ 59

Relay____________________________ 61

Ringer MC-13L___________________ 55

SIG-BELL switch_________________ 56

Transformers_____________________ 61

Upper and lower housings . 48

Visual signalleaL_________________ 60

Repacking for shipment and limited 74

storage.

Replacement, tube testing and___________ 32

Ringer MC-131:

Adj'lstmenL______________________ 66

Final test_________________________ 71

Removal and replacemenL__________ 55

32 33

11 16 11 16

11 16

39 5

9 9 9 9

10 9 19 9

19 19 19 22

19

Second echelon maintenance_____________ 28

Shipment and limited storage, 74

repacking.

SIG-BELL switch, removal and 56

replacement.

Signal leaf coils, visual, removal and 60

replacement.

Signaling (operation) 16

Signaling circuit (theory) 41

Siting________________________________ 9

23 21

19

9 9

11 11 11

Technical characteristics________________ 4

Test equipment required for final 69

testing.

Test, final:

Amplifier 72

Generator_________________________ 71

Handset__________________________ 70

Insulation_________________________ 71

Ringer___________________________ 71

Testing, final, purpose__________________ 68

Tools and materials (operator's) 25

Tools, materials and test equipmenL_____ 29

Transformers, removal and replace- 61

ment.

Transmitting circuit with amplifi- 39

cation (theory).

Tran.smitting circuit without amplifi- 38

cation (theory).

11 27 26

6 11 11 11 16

16 16

8 36

Page

22 19

32 3 32

28 28 32 31 31 28 29 29 28 29 31 32 30 30 32 28 32 39

18

33 37 30

16 39

30

32

9 23 6

3 37

37 37 37 37 37 36 11 16 32

21

19

AGO 2020A

Paragraph Page

Trouble, localizing ----------,---_____ 43 24

Troubleshooting chart --________________ 44 24

Troubleshooting, using equipment 33 18

performance checklist.

Tube testing and replacement ---------____ 32 18

Unpacking ---------__________ 10 6

Upper and lower housings, removal 48 28

and replacement.

Paragraph Page

Use, preparation 12 6

Use, purpose and 3 3

Values, resistance, point-to-point____ 46 27

Visual inspection -- 31 16

Visual signal leaf:

AdjustmenL_______________________ 65 33

Coils, removal and replacement_____ 60 32

Voltages, point-to-poinL________________ 45 26

By ORDER OF THE SECRETARIES OF THE ARMY AND THE AIR FORCE:

OFFICIAL:

HERBERT M. JONES, Major General, United States Army, The Adjuf;(Jnt General.

OFFICIAL:

J. L. TARR,

Colonel, United States Air Force, Air Adjutant General.

Distribution:

Active Army:

ASA CNGB

Technical St:f, DA Technical Stf Bd USA Arty Bd

USA Armor Bd USA Inf Bd

USA Air Dei Bd USA Abn & Elct Bd USA Avn Bd

USA Armor Bd Test Sec USA Air Dei Bd Test Sec USA Arctic 'l'est Bd USCONARC

US ARADCOM

OS Maj Comd

MDW

Armies

Corps

Div

USATC

Ft& Camp

Svc Colleges

Br Svc Sch

Gen Depots

Sig Sec, GenDepots Sig Depots

Fld Comd, Af'SWP Engr Maint Cen Army Pictorial Cen

AGO 2020A

MAXWELL D. TAYLOR, General, United States Army, Chief of Staff.

THOMAS D. WHITE,

Chief of Staff, United States Air Force.

WRAMC AFIP AMS

Port of Emb (OS) Trans Terminal Comd Army Terminals

OS Sup Agcy

USA Sig Pub Agcy

USA Sig Comm Engr Agcy USA Comm Agcy

TASSA

USA White Sands Sig Agcy Yuma Test Sta

USA Sig Eqp Spt Agcy USA Elct PG

Sig Fld Maint Shops Sig Lab

Mil Dist

JBUSMC

Mil Mis: Argentina: Cuba:

Ecuador

Units org under fol TOE: 5-315

5-316

6-100

6-101

6-200

6-201

6-225

6-226

47

6-300 6-301 6-315 6-316 6-325 6-326 6-401 6-415 6-416 6-501 6-515 6-525 6-545 6-558 6-575 6-576 6-577 6-635 8-15 8-16 8-17 8-18 10-17 10-377 11-7 11-15 11-16 11-18 11-57 11-95 11-97

NG: State AG; units-same as Active Army. USAR: None.

For explanation of abbreviations used see AR 320-60.

48

11-127 11-128

11-500 (AA-AE) 11-557

11-587

11-592

11-597

19-27

39-61

44-7

44-15

44-16

44-17

44-25

44-27

44-35

44-36

44-37

44-70

44-90

44-101

44-112

44-115

44-116

44-201

44-275

44-27.6

44-315

44-316

44-415

44-416

ttu. S. GOVERNMENT PRINTING OFFICE: 1958 0 - 440474 (5Z49-A)

AGO 202M

TM 11-2059 (TP-9 and TA 264-PT Field Telephones)

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﻿DEPARTMENT OF THE ARMY TECHNICAL MANUAL

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DEPARTMENT OF THE ARMY TECHNICAL MANUAL