TM 11-5965-262-13D E P A R T M E N T O F T H E A R M Y T E C H N I C A L M A N U A L

ORGANIZATIONAL AND DS MAINTENANCE MANUALINCLUDING REPAIR PARTS AND

SPECIAL TOOL LISTS

HEADSET-MICROPHONEH-161/U AND H-161A/U

This copy is a reprint which includes current

pages from Changes 1 and 2.

H E A D Q U A R T E R S , D E P A R T M E N T O F T H E A R M YF E B R U A R Y 1 9 6 6

*TM 11-5965-232-13

Technical Manual HEADQUARTERSDEPARTMENT OF THE ARMY

No. 11-5965-262-13 Washington, D.C., 23 February 1966

Organizational and DS Maintenance Manual Including Repair Parts and SpecialTools List

HEADSET-MICROPHONES H-161/U AND H-161A/U

CHAPTERSection

1.I.

II.

2.

1-11-11-11-1

1-41-51-61-6.11-71-8

Chapter2 - 12-2

3.

4.

5.

ParagraphINTRODUCTIONGeneralScope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Indexes of publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Forms and records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reporting of Equipment Publication Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Description and dataPurpose and use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Technical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... Table of components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..... . . . . . . . . . . . . . . . . . . . . . Items comprising an operable equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...Description of Headaet-Microphones H-161/U and H-161A/U . . . . . . . . . . . . . . . . . . . . . . . . . . .Differences between models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..INSTALLATION AND OPERATING INSTRUCTIONSInstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . .Operating procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OPERATOR’S MAINTENANCE INSTRUCTIONSScope of operator’s maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Items required for maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Preventive maintenance checks and services periods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...Operator’s daily preventive maintenance checks and services chart . . . . . . . . . . . . . . . . . . . .Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ORGANIZATIONAL MAINTENANCE INSTRUCTIONSScope of organizational maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tools, materials, and test equipment required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..Quarterly preventive maintenance checks and services chart . . . . . . . . . . . . . . . . . . . . . . . .DIRECT SUPPORT MAINTENANCE INSTRUCTIONSScope of direct support maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Troubleshooting chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Dc resistance chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Disassembly and reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-13 - 23 - 33 - 43-53 - 6

4 - 14 - 24 - 3

5 - 15 - 25 - 35 - 45 - 5

Appendix I. REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .II. BASIC ISSUE ITEMS LIST (BIIL) AND ITEMS TROOP INSTALLED OR

AUTHORIZED LIST (ITIAL) (Not Applicable)

Page

1-11-11-11-1

1-11-11-11-11-11-2

2-12-1

3-13-13-13-13-23-2

4-14-14-1

5-15-15-15-25-2

. . .. Al-l

III. MAINTENANCE ALLOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A3-1IV. ORGANIZATIONAL AND DIRECT SUPPORT MAINTENANCE

REPAIR PARTS AND SPECIAL TOOL LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A4-1

*This manual supersedes TM 11-5965-262-13, 18 May 1962, Including C 1, 30 October 1962, C 2, 21 June 1963 and TM11-5965-262-23P, 26 October 1962, including C 1, 5 October 1964.

Change 1 i

TM 11-5965-262-13

CHAPTER 1INTRODUCTION

Section I.

1-1. ScopeThis manual describes Headset-Microphones H-161/U and H-161A/U (figs. 1-1 and 1-2) and coverstheir installation, operation, and organizationalmaintenance. It includes operation, cleaning andinspection of the equipment, and replacement ofparts available to organizational and direct sup-port maintenance personnel.

1-2. Indexes of Publicationsa. DA Pam 310-4. Refer to the latest issue of

DA Pam 310-4 to determine whether there are neweditions, changes, or additional publications per-taining to the equipment.

b. DA Pam 310-7. Refer to DA Pam 310-7 todetermine whether there are modification work or-ders (MWO’s) pertaining to the equipment.

1-3. Forms and Recordsa. Reports of Maintenance and Unsatisfactory

Equipment. Maintenance forms, records, andreports which are to be used by maintenance per-

GENERAL

sonnel at all maintenance levels are listed in andprescribed by TM 38-750.

b. Report of Packaging and Handling Deficien-cies. Fill out and forward DD Form 6 (Report ofPackaging and Handling Deficiencies) asprescribed in AR 700-58/NAVSUP PUB 378/AFR71-4/MCO P4030.29, and DSAR 4145.8.

c. Discrepancy in Shipment Report (DISREP)(SF 361). Fill out and forward Discrepancy inShipment Report (DISREP) (SF 361) as prescribedin AR 55-38/NAVSUPINST 4610.33/AFM 75-18/MCO P4610.19A, and DSAR 4500.15.

1-3.1. Reporting of Errors EquipmentPublication ImprovementsThe reporting of errors, omissions, and recom-mendations for improving this publication by theindividual user is encouraged. Reports should besubmitted on DA Form 2028 (RecommendedChanges to Publications and Blank Forms), andforwarded direct to Commander, US Army Elec-tronics Command, ATTN: AMSEL-MA-A, FortMonmouth, NJ 07703.

Section II. DESCRIPTION AND DATA

1-4. Purpose and UseHeadset-Microphones H-161/U and H-161A/Uprovide facilities for transmission and reception ofvoice-frequency speech signals. They can be usedwith portable and vehicular radio sets in areaswhere background noise is medium to high. Theycan be worn under the M1 infantry helmet. Bothmodels are similar, except that the H-161A/Ueliminates more background noise.

1-5. Technical Characteristics

Frequency response . . . . . . . . . . .. 300 to 3,500cps.Headset impedance . . . . . . . . . . .. 500 ohms.Normal headset input level . . . . 56 dbm at 1,000 cps.

1-6. Table of ComponentsThe components of Headset-Microphones H-161/Uand H-161A/U are listed in the basic issue itemslist (appx III), and are illustrated in figures 1-1and 1-2.

1-6.1. Items Comprising an OperableEquipmentHeadset-Microphone H-161/U (FSN 5965-825-4871)and Headset-Microphone H-161A/U (FSN 5965-082-4037) each comprises an operable equipment.

1-7. Description o f Headse t -Microphones H-161/U and H-161A/U

(figs. 1-1 and 1-2)Both units consist of two earphone cup assemblies,a headband assembly, microphone and boomassembly, neck strap-suspended chest set assembly(switch), retractile cable assembly, and a head-setcard assembly. These assemblies are describedbelow.

a. Earcup Assembly. The earcup assembly con-sists of an earphone, earphone retainer, trans-former, earcup plate, and earcup cushion. Theearcup and earcup plate are made of lightweighthigh impact plastic.

Change 1 1-1

TM 11-5965-262-13

b. Microphone and Boom Assembly. Themicrophone and boom assembly holds themicrophone close to the operator’s lips, and helpseliminate background noise. The boom microphonecase is made of lightweight high impact plastic.

c. Chest Switch Assembly. The chest switchassembly employs a three-position switch to selectthe circuit over which the user wishes to talk andlisten.1-8. Differences Between Models

(figs. 5-1 and 5-2)

Headset-Microphone H-161A/U is interchangeablewith the H-161/U, but the H-161/U cannot be sub-stituted for the H-161A/U. Connector, Plug, Elec-trical U-182/U on the H-161A/U interphone cordhas been rewired to include a ground wire to pin A(fig. 5-2). This change was made to help eliminatebackground noise. The H-161A/U uses a cheststrap, instead of the clothing clip used on the H-161/U (figs. 1-1 and 1-2), to hold the chest switchassembly close to the user’s chest.

Figure 1-1. Headset-Microphone H-161/U.

1-2 Change 1

Figure 1-2.

TM

11-5965-262-131-3

TM 11-5965-262-13

CHAPTER 2

INSTALLATION AND OPERATING INSTRUCTIONS

2-1. Installation(fig. 1-1 and 1-2)

a. Connection to Radio Set.(1)

(2)

(3)

(4)

Insert the U–182/U on the short cord intothe receptacle on the radio equipment pro-vided for radio communication.Rotate the plug slowly to the right, keep-ing a steady forward pressure against thereceptacle. When the plug pins are in theproper grooves, the plug will move for-ward.Twist the plug to the right and pullsharply to set the plug.Insert the U-182/U on the long cord intothe receptacle on the radio equipment pro-vided for interphone communications,and repeat the procedures given in (2)and (3) above.

b. Headset Installation.(1)

(2)

(3)(4)

Extend each earphone adjusting as-sembly to its full range. Place the head-set on your head.Hold one earphone assembly firmly inplace over your ear and press the head-band down. The headband will slidesmoothly into position. Do the same withthe other earphone cup.Readjust for maximum comfort.When using the H-161/U, fasten the

(5)

(6)

clothing clip to the front of yourclothing.

Warning: Do not fasten the clothingclip to anything that will not remainwith you if you leave the area in ahurry.When using the H-161A/U, fasten thechest strap around your body.Using your fingers, loosen the tension nut(behind the ball joint assembly) one-half turn and adjust the position of themicrophone. Position the microphone sothat it touches the lips. Tighten the ten-sion nut when the position is satisfactory.

c. Chest Switch Assembly Installation.(2) Unfasten the removable neck strap clip

from the chest set and adjust the neckstrap to length. Put on the chest set.

(2) Carefully align the male and female bail-out connectors and plug them together.

2-2. Operating Procedurea. For transmission on the radio circuit, push

the switch handle (fig. 1–1 and 1–2) to RAD andhold it there. Release the switch handle to the off(center) position for listening.

b. To talk and listen on the interphone circuit,move the switch handle to ICS. The switch willlock in this position.

2-1

CHAPTER 3

OPERATOR’S MAINTENANCE INSTRUCTIONS

TM 11-5965-262-13

3-1. Scope of Operator’s MaintenanceThe maintenance duties assigned to the operator

of the H–161/U and H–161A/U are listed below,with a reference to the paragraphs covering thespecific maintenance function.

a. Operator’s daily preventive maintenancechecks and services (para 3–5).

b. Cleaning (para 3-6).

3-2. Items Required for MaintenanceOnly the following items are required for main-

tenance:a. Cleaning compound (FSN 7930-395-9542).b. Cleaning cloth.Warning: Prolonged breathing of cleaning

compound is dangerous; make sure that ade-quate ventilation is provided. Cleaning com-pound is flammable; do not use near a flame.Avoid contact with the skin; wash off any thatspills on your hands.

3-3. Preventive MaintenancePreventive maintenance is the systematic care,

servicing, and inspection of equipment to preventthe occurrence of trouble, to reduce downtime, andto assure that the equipment is serviceable.

a. Systematic Care. The procedures given inparagraphs 3-4, 3-5, and 3-6 cover routine system-atic care and cleaning essential to proper upkeepand operation of the equipment.

b. Preventive Maintenance Checks and Services.The preventive maintenance checks and serviceschart (para 3-5) outlines functions to be per-formed at specific intervals. These checks andservices are to maintain Army electronic equip-ment in a combat serviceable condition; that is ingood general (physical) condition and in goodoperating condition. To assist operators in main-taining combat serviceability, the chart indicateswhat to check and the normal conditions; theReferences column lists the illustration, para-graph, or appendix that contains detailed repair orreplacement procedures. If the defect cannot beremedied by the operator, higher level mainte-nance or repair is required. Records and reportsof these checks and services must be made in ac-cordance with the requirements set forth in TM38-750.

3-4. Preventive Maintenance Checks andServices Periods

Paragraph 3-5 specifies checks and services thatmust be accomplished daily or under the specialconditions listed below:

a. Before the H–161/U or H–161A/U is putinto operation.

b. When the H-161/U or H-161A/U is initiallyinstalled.

c. When the H–161/U or H–161A/U is rein-stalled after removal for any reason.

3-1

TM 11-5965-262-13

3-5. Operator’s Daily Preventive Maintenance Checks and Services ChartSe-

quenceNo.

1

2

3

4

5

6

Item to be inspected

Completeness -------

Cleanliness -.-- . . . . .

Cabling ------------

Straps -------------

Knob and switch...

Operation ----------

Procedure

Check to see that all assemblies are on hand and are connectedproperly.

Chcck all components for dust, dirt, grease, and fungus. Use a dry,clean, lint-free cloth or brush to remove dust, fungus, and dirt. Ifnecessary, moisten the cloth or brush with cleaning compound(FSN 7930-395-9542). After cleaning, wipe dry with a cloth.

Warning: Cleaning compound is flammable and its fumes aretoxic. Do not use near a flame; provide adequate ventilation.

Caution: When cleaning the earphone or microphone cap, donot insert sharp tools into the holes.

Check cables for cuts, cracks, and breaks, and check retractile cablefor proper tension.

Check to see that the chest and neck straps are not cut or dam-aged.

Check to see that the knob setscrew and switch mounting are tight.

a. For transmission on the radio circuit, push the switch handle toRAD and hold. Release switch handle to the off (center)position for listening.

b. To talk and listen on the interphone circuit, move the switchhandle to ICS; the switch will lock in this position.

References

Appx III andfigs. 1-1and 1–2.

Para 3-6.

Figs. 1-1 and1-2.

Figs. 1-1 and1-2.

Figs. 1–1 and1-2.

Figs. 1-1 and1-2.

Figs. 1-1 and1-2.

3-6. Cleaning contact with the skin; wash off any that spills

Inspect the exteriors of the headset-microphone. on your hands.

The exterior surfaces should be free of dust, dirt, b. Remove grease, fungus, and ground-in dirt

grease, and fungus. from cables and components; use a cloth dampeneda. Remove dust and dirt with a soft, clean cloth. (not wet) with cleaning compound.Warning: Prolonged breathing of cleaning c. Remove tarnish and corrosion from plugs and

compound is dangerous; make sure adequate jacks with crocus cloth, or jeweler’s rouge appliedventilation is provided. Cleaning compound is to a soft cloth.flammable; do not use near a flame. Avoid

3-2

TM 11-5965-262-13

CHAPTER 4

ORGANIZATIONAL MAINTENANCE INSTRUCTIONS

4-1. Scope of Organizational Maintenancea. This chapter contains instructions covering

organizational maintenance of the H–161/U andH-161A/U.

b. Organizational maintenance consists of thefollowing:

(1) Preventive maintenance (para 4-3).(2) Replacement of defective components

(para 4-3).(3) Minor repair of defective components

(para 4-3).

4-2. Tools, Materials, and Test EquipmentRequired

The tools, materials, and test equipment re-quired for organizational maintenance are as fol-lows:

a. Tools. Tool Kit, Radar and Radio Repair-man TK-87/U.

b. Materials.(1) Cleaning Compound (FSN 7930-395-

9542).(2) Cleaning cloth.

c. Test Equipment. Multimeter TS-352/U.

4-3. Quarterly Preventive Maintenance Checks and Services Chart

Se-quence

No.

1

2

3

4

5

6

7

Item to be inspected

Completeness -------

Cabling -------------

Earphones ---------

Boom microphone ---

Chest set- . . . . . . . . .

Knob and switch----

Modifications---- ..-

Procedure

Check to see that the equipment is complete; replace missing assem-blies.

Check and replace cable assemblies having cuts, cracks, or breaks;replace retractile cable if tension is weak.

Check and repair or replace headband, earphone cushions, earphoneadjusting assemblies, and earphone covers that are broken, torn,damaged, or have reached a mechanical condition that wouldresult in marginal reliability.

Check and repair or replace microphone, microphone cover, and balljoint assembly that are broken, damaged, or have reached amechanical condition that would result in marginal reliability.

Check and repair or replace neck strap and switch case and clothingclip that are broken, cut, damaged, or have reached a mechanicalcondition that would result in marginal reliability.

Tighten or replace if setscrew cannot be tightened, and if knob ischipped or broken. Tighten switch mounting.

Check DA Pam 310-4 to determine if new applicable MWO’s havebeen published. All URGENT MWO’s must be applied immedi-ately. All NORMAL MWO’s must be scheduled.

Referemces

Appx III andfigs. 1-1 and1-2.

Appx IV andfigs 1-1 and1-2.

Appx IV andfigs. 1-1 and1-2.

Appx IV andfigs. 1–1 and1-2.

Appx IV andfigs. 1–1 and1-2.

Appx IV andfigs 1-1 and1-2.

DA Pam 310-4.

4-1

CHAPTER 5

DIRECT SUPPORT MAINTENANCE INSTRUCTIONS

5-1. Scope of Direct Support MaintenanceMaintenance at the direct support level includes

all the techniques outlined for organizationalmaintenance and any special techniques requiredto isolate defective parts or components. Thesetechniques are described in the troubleshootingchart (para 5-3). Direct support maintenanceincludes replacement of parts not available atlower levels of maintenance.

5-2. TroubleshootingThe systematic troubleshooting procedure,

5-3. Troubleshooting Chart

No.

—Item

1

2

3

Trouble symptom

No sound fromeither earphone.

Intermittentsound from bothearphones.

No sound fromone earphone.

Probable trouble

Connectors, Plug Electri-cal U-182/U not seated.

Defective Connectors,Plug, ElectricalU-182/U.

Defective retractileCable AssemblyCX-8650/U (orCX-8650A/U).

Defective bailout con-nector.

Loose connections.. . . . .

Defective jumper cordbetween earphones.

Defective electromagnetwinding.

Defective earphonetransformer primarywinding.

Defective earphonetransformer secondarywinding.

TM 11-5965-262-13

which begins with the operational and sectional-ization checks that are performed at an organiza-tional level, is carried to a higher level in thischapter. The sectionalizing, localizing, and iso-lating techniques used in the troubleshooting pro-cedures are more advanced. Use Multimeter TS–352/U when making continuity checks, and com-pare the measured resistance with the direct-cur-rent (dc) resistance chart (para 54).

Checks and corrective measures

Disconnect and reconnect Connectors, Plug Electrical U-182/U(figs. 1-1 and 1-2).

Substitute a known good cable assembly (CX-8650/U or CX-8650A/U) for the one having the suspected defective U-182/U’s.If sound is restored to both earphones, the original U-182/U’sshould be replaced (figs. 1–1, 1-2, 5-1, and 5–2).

Substitute a known good CX-8650/U (or CX-8650A/U). Ifsound is restored, check continuity of the white and black wiresin the cable (figs. 5-1 and 5-2). Replace with new cable ifan open or short circuit is found.

Inspect connector for bent or broken contacts (figs. 1-1 and 1-2).If unrepairable, replace retractile Cable Assembly CX-8650/GR(or CX-8650A/GR) or Cable Assembly CX-8652/GR.

Check connections on earphone transformer primary on boommicrophone side of headset (figs. 1–1, 1–2, 5-1, and 5–2).Tighten connections.

Check continuity of jumper cord between earphone transformerprimary windings (figs. 5-1 and 5-2). Replace if open- orshort-circuited.

Check continuity of electromagnet winding (para 5–4 and figs.5-1 and 5-2). If open or short, replace entire earphoneassembly.

Check continuity of transformer primary winding (figs. 5-1 and5-2) . If open- or short-circuited, replace transformer assem-bly.

Check continuity of transformer secondary winding (figs. 5-1and 5–2). If open- or short-circuited, replace transformerassembly.

5-1

TM 11-5965-262-13

ItemNo.

Checks and corrective measures

4

5

6

Trouble symptom

No transmissionon both radioand interphonecircuits.

No transmissionin interphonecircuit.

No transmission inradio circuit.

Probable trouble

Defective microphonetransformer.

Defective Cable Assem-bly CX-8652/GR.

Defective dynamicmicrophone.

Defective toggle switch.

Defective bailoutconnector.

Defective Cable Assem-bly CX-8650/GR.

Defective Cable Assem-bly CX-8650A/GR.

Defective Connector,Plug ElectricalU-182/U.

Defective toggle switch.Defective Cable Assem-

bly CX-8650/U.Defective Cable Assem-

bly CX-8650A/U.Defective toggle switch.

Check continuity of microphone transformer secondary windingat Connector Plug JJ–055 (figs. 1–1 and 1–2). If open- orshort-circuited, replace the boom microphone.

Check the continuity of the red and shield microphone circuit,between J1 and the bailout connector of the CX-8652/GR(figs. 1-1, 1-2, 5-1, and 5-2). If open- or short-circuited,replace the CX-8652/GR.

If a continuity check of Cable Assembly CX-8652/GR is satis-factory, replace the dynamic microphone.

Cheek connections and continuity of the toggle switch in thechest switch assembly (figs. 5–1 and 5–2). Tighten loosenedconnections and replace a defective switch.

Check bailout connector contacts to determine if they are brokenor bent (figs. 1-1, 1–2, 5–1, and 5–2). Replace Cable Assem-bly CX–8650/GR or CX-8652/GR, if necessary.

Check continuity of the orange wire in the interphone cord(figs. 1-1 and 5-1). Replace a defective CX-8650/GR.

Check continuity of the orange and black wires in the interphonecord (figs. 1–2 and 5–2). Replace a defective CX-8650A/GR.

Check condition and seating of the U-182/U for broken or bentcontacts (figs. 5–1 and 5–2). Replace a defective U-182/U.

Check continuity of toggle switch. Replace if necessary.Check continuity of the red and black wires in the radio cord (figs.

1-1 and 5-1). Replace a defective CX-8650/U.Same as above (figs. 1-1 and 5-1). Replace a defective CX-

8650A/U.Check continuity of toggle switch (figs. 5-1 and 5-2). Replace

if necessary.

5-4. DC Resistance ChartAll measurements made with Multimeter TS

352/U.

Item Resistance(approx)

Earphone transformer primary (one) -------- 50 ohms.Earphone transformer primary (parallel) ----- 25 ohms.Earphone transformer secondary ---------- 1½ ohms.Earphone electromagnet ------------------- 16 ohms.Microphone transformer secondary ---------- 11.8 ohms.

5-5. Disassembly and ReassemblyAll the parts in the H-161/U (or H-161A/U)

can be reached easily and replaced without specialprocedure. When disassembling the earphone,microphone, or chest switch assembly, note the po-sition and color of the wires. Be sure to reconnectthe wires to the same terminals from which theywere removed.

5-2

TM 11-5965-262-13

Figure 5-1. Headset-Microphone H-161/U, wiring diagram.

5-3

TM 11-5965-262-13

Figure 5-2. Headset-Microphone H-161A/U, wiring diagram.

5-4

TM 11-5965-262-13

APPENDIX I

REFERENCES

Following is a list of applicable references available to the operator and maintenance personnel ofHeadset-Microphones H-161/U and H-161A/U.

DA Pam 310-4 Index of Technical Manuals, Technical Bulletins, Supply Manuals (Types 7, 8,and 9), Supply Bulletins, Lubrication Orders, and Modification Work Orders.

TB SIG 355-3 Depot Inspection Standard for Moisture and Fungus Resistant Treatment.TB SIG 364 Field Instructions for Painting and Preserving Electronics Command Equipment.TM 9-213 Painting Instructions for Field Use.TM 11-5527 Multimeters TS-352/U, TS-352A/U, and TS-352B/U.TM 38-750 Army Equipment Record Procedures.

A1-1

TM 11-5965-262-13

APPENDIX III

MAINTENANCE ALLOCATION

Section I. INTRODUCTION

A3-1. Generala. This appendix assigns maintenance functions

to be performed on components, assemblies, andsubassemblies by the lowest appropriate mainte-nance category.

b. Columns in the maintenance allocation chartare as follows:

(1) Part or Component. This column showsonly the nomenclature or standard itemname. Additional descriptive data areincluded only where clarification is neces-sary to identify the component. Compo-nents, assemblies, and subassemblies arelisted in top-down order. That is, theassemblies which are part of a componentare listed immediately below that compo-nent, and subassemblies which are partof an assembly are listed immediately be-low that assembly. Each generationbreakdown (components, assemblies, orsubassemblies) are listed in disassemblyorder or alphabetical order.

(2) Maintenance function. This column in-dicates the various maintenance functionsallocated to the categories.

(a)

(b)

(c)

(d)

(e)

(f)

Service. To clean, to preserve, and toreplenish lubricants.Adjust. To regulate periodically toprevent malfunction.Inspect. To verify serviceability anddetect incipient electrical or mechanicalfailure by scrutiny.Test. To verify serviceability and todetect incipient electrical or mechanicalfailure by use of special equipment suchas gages, meters, and other test devices.Replace. To substitute serviceable com-ponents, assemblies, subassemblies, forunserviceable components, assembliesor subassemblies.Repair. To restore an item to service-able condition through correction of a

(g)

(h)

(i)

(j)

specific failure or unserviceable condi-tion. This function includes but is notlimited to welding, grinding, riveting,straightening, and replacement of partsother than the trial and error replace-ment of running spare type items suchfuses, lamps, or electron tubes.Align. To adjust two or more com-ponents of an electrical system sothat their functions are properly syn-chronized.Calibrate. To determine, check, or rec-tify the graduation of an instrument,weapon, or weapons system, or com-ponents of a weapons system.Overhaul. To restore an item to com-pletely serviceable condition as pre-scribed by serviceability standards.This is accomplished through employ-ment of the technique of “inspect andrepair only as necessary” (IROAN).Maximum utilization of diagnostic andtest equipment is combined with mini-mum disassembly of the item duringthe overhaul process.Rebuild. To restore an item to a stand-ard as near as possible to original ornew condition in appearance, perform-ance, and life expectancy. This is ac-complished through the maintenancetechnique of complete disassembly ofthe item, inspection of all parts or com-ponents, repair or replacement of wornor unserviceable elements using originalmanufacturing tolerances and/or speci-fications and subsequent reassembly ofthe item.

(3) Operator, organization, direct support,general support and depot. The symbolX indicates the categories responsible forperforming that particular maintenanceoperation, but does not necessarily indi-cate that repair parts will be stocked at

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that level. Categories higher than thosemarked by X are authorized to performthe indicated operation.

(4) Tools required. This column indicatescodes assigned to each individual toolequipment, test equipment, and mainte-nance equipment referenced. The group-ing of codes in this column of the mainte-nance allocation chart indicates the tool,test, and maintenance equipment requiredto perform the maintenance function.

(5) Remarks. Entries in this column will beutilized when necessary to clarify any ofthe data cited in the preceding columns.

c. Columns in the allocation of tools for main-tenance functions are as follows:

(1) Tools required for maintenance func-

(2)

(3)

tions. This column lists tools, test, andmaintenance equipment required to per-form the maintenance functions.Operator, organization, direct support,general support, and depot. The dagger(†) symbol indicates the categories nor-mally allocated the facility.Tool code. This column lists the tool code

assigned.

A3-2. Maintenance by Using OrganizationsWhen this equipment is used by signal services

organizations organic to theater headquarters orcommunication zones to provide theater communi-cations, those maintenance functions allocated upto and including general support are authorized tothe organization operating this equipment.

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APPENDIX IVORGANIZATIONAL AND DIRECT SUPPORT MAINTENANCE

REPAIR PARTS AND SPECIAL TOOLS LIST

SECTION I INTRODUCTION

A4-1. ScopeThis appendix lists repair parts and special toolsrequired for the performance of organizationaland direct support maintenance of the H-161/Uand H-161A/U. The PCCN for the equipment isGCWAQA for all models. This appendix is currentas of December 1974.

A4-2. GeneralThis repair parts and special tools list is dividedinto the following sections:

a. Prescribed Load Allowance (PLA) -Section II.Not applicable.

b. Repair Parts List -Section III. A list of repairparts authorized for the performance of mainte-nance at the organizational level. This repairparts list is arranged in alphabetical order.

c. Special Tools, Test and Support Equipment -Section IV. Not applicable.

d. Repair Parts List -Section V. A list of repairparts authorized for the performance of mainte-nance at the direct support level.

e. Special Tools, Test and Support Equipment -Section VI. Not applicable.

f. Index — Federal Stock Number and ReferenceNumber Cross-Reference to Figure and ItemNumber — Section VII. A list, in ascendingnumerical sequence, of all Federal stock numbersappearing in the listings, followed by a list, inalphanumeric sequence, of all reference numbersappearing in the listings. Federal stock numberand reference numbers are cross-referenced toeach illustration figure and item number orreference designation appearance.

A4-3. Explanation of ColumnsThe following provides an explanation of columnsfound in the tabular list.

a. Source, Maintenance, and RecoverabilityCodes (SMR).

(1) Source code. Indicates the manner ofacquiring support items for maintenance, repair,or overhaul of end items. Source codes are —

Code Definition

PA — Item procured and stocked for anticipatedor known usage.

PB — Item procured and stocked for insurancepurposes because essentiality dictatesthat a minimum quantity be availablein the supply systems.

PC — Item procured and stocked and whichotherwise would be coded PA exceptthat it is deteriorative in nature.

PD — Support item, excluding support equip-ment, procured for initial issue oroutfitting and stocked only for subse-quent or additional initial issues oroutfitting. Not subject to automaticreplenishment.

PE — Support equipment procured and stockedfor initial issue or outfitting to specifiedmaintenance repair activities.

PF — Support equipment which will not bestocked but which will be centrallyprocured on demand.

PG — Item procured and stocked to provide forsustained support for the life of theequipment. It is applied to an itempeculiar to the equipment which be-cause of probable discontinuance orshutdown of production facilities wouldprove uneconomical to reproduce at alater time.

KD — An item of depot overhaul/repair kit andnot purchased separately. Depot kitdefined as a kit that provides itemsrequired at the time of overhaul orrepair.

KF — An item of a maintenance kit and notpurchased separately. Maintenance kit

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defined as a kit that provides an itemthat can be replaced at organizationalor TM 11-5965-262-13 direct support orgeneral support levels of maintenance.

KB — Item included in both a depot over-haul/repair kit and a maintenance kit.

MO — Item to be manufactured or fabricated atorganizational level.

MF — Item to be manufactured or fabricated atdirect support maintenance level.

MH — Item to be manufactured or fabricated atgeneral support maintenance level.

MD — Item to be manufactured or fabricated atdepot maintenance level.

AO — Item to be assembled at organizationallevel.

AF — Item to be assembled at direct supportmaintenance level.

AH — Item to be assembled at general supportmaintenance level.

AD — Item to be assembled at depot mainte-nance level.

XA — Item is not procured or stocked becausethe requirements for the item willresult in the replacement of the nexthigher assembly.

XB — Item is not procured or stocked. If notavailable through salvage, requisition.

XC — Installation drawing, diagram instructionsheet, field service drawing, that isidentified by manufacturers’ partnumber.

XD — Support items can be requisitioned withjustification.

NOTECannibalization or salvage may be usedas a source of supply for any itemssource coded above except those codedXA and aircraft support items asrestricted by AR 700-42.

(2) Maintenance code. Maintenance codes areassigned to indicate the levels of maintenanceauthorized to USE and REPAIR support items.The maintenance codes are entered in the thirdand fourth positions of the Uniform SMR CodeFormat as follows —

(a) Use (third position). The maintenancecode entered in the third position indicates thelowest maintenance level authorized to remove,

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replace, and use the support item. The mainte-nance code entered in the third position indicatesone of the following levels of maintenance.

Code Application/Explanation

O— Support item is removed, replaced, used atthe organizational level.

NOTEA code “C” maybe used in this position todenote crew or operator maintenanceperformed within organizationalmaintenance.

F — Support item is removed, replaced, used atthe direct support level.

H — Support item is removed, replaced, used atthe general support maintenance.

D — Support items that are removed, replaced,used at depot only.

(b) Repair (fourth position). The mainte-nance code entered in the fourth position indi-cates whether the item is to be repaired andidentifies the lowest maintenance level with thecapability to perform complete repair (i.e., allauthorized maintenance functions). When amaintenance code is not used a dash (-) sign isentered. For multi-service equipment/systems orwhen a code is entered, this position will containone of the following maintenance codes asassigned by the service(s) that require the code —

Code

O—

F —

H—

D —

L —

Z —B —

Application/Explanation

The lowest maintenance level capable ofcomplete repair of the support item isthe organizational level.

The lowest maintenance level capable ofcomplete repair of the support item isdirect support.

The lowest maintenance level capable ofcomplete repair of the support item isgeneral support.

The lowest maintenance level capable ofcomplete repair of the support item isthe depot level.

Repair restricted to designated Spe-cialized Repair Activity.

Non-repairable. No repair is authorized.No repair is authorized. The item may be

reconditioned by adjusting, lubricating,etc., at the user level. No parts or special

tools are procured for the maintenanceof this item.

(3) Recoverability code. Recoverability codesare assigned to support items to indicate thedisposition action on unserviceable items. Therecoverability code is entered in the fifth positionof the uniform SMR Code Format as follows —

CodeZ —

O –

F —

H —

D —

L —

A —

ExplanationNonrepairable item. When unserviceable,

condemn and dispose at the levelindicated in the first digit of themaintenance code.

Repairable item. When uneconomicallyrepairable, condemn and dispose atorganizational level.

Repairable item. When uneconomicallyrepairable, condemn and dispose at thedirect support level.

Repairable item. When uneconomicallyrepairable, condemn and dispose at thegeneral support level.

Repairable item. When beyond lower levelrepair capability, return to depot. Con-demnation and disposal not authorizedbelow depot level.

Repairable item. Repair, condemnationand disposal not authorized belowDepot/Specialized Repair Activitylevel.

Item requires special handling or con-demnation procedures because ofspecific reasons (i.e., precious metalcontent, high dollar value, criticalmaterial or hazardous material).

b. Federal Stock Number. Indicates the Federalstock number assigned to the item.

NOTEFor requisitioning purposes, the Federalstock number must be converted to theNational stock number by adding “-00-”after the Federal stock classification(FSC) code (first four digits). For exam-ple, FSN 6625-553-0142 converts to NSN6625-00-553-0142.

c. Description. Indicates the Federal item nameand a minimum description required to identifythe item. The last line indicates the referencenumber followed by the applicable Federal SupplyCode for Manufacturer (FSCM) in parentheses.

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The FSCM is used as an element in itemidentification to designate manufacturer or dis-tributor or Government agency, etc., and isidentified in SB 708-42.

d. Unit of Measure (U/M). Indicates the stan-dard or basic quantity by which the listed item isused in performing the actual maintenancefunction. This measure is expressed by a two-character alphabetical abbreviation; e.g., ea, in,pr, etc., and is the basis used to indicate quantitiesand allowances in subsequent columns. When theunit of measure differs from the unit of issue, thelowest unit of issue that will satisfy the requiredunits of measure will be requisitioned.

e. Quantity Incorporated in Unit. This columnindicates the quantity of the item used in theequipment.

f. 15-Day Organizational Maintenance Allow-antes.

(1) The repair parts indicated by an asterisk inthe allowance column represent those authorizedfor use at the organizational category, and will berequisitioned on an “as required” basis, untilstockage is based on demand in accordance withAR 710-2.

(2) Major Army commanders are authorizedto approve reduction in the range of support itemsauthorized for use in units within their com-mands. Recommendations for increase in range ofitems authorized for use will be forwarded toCommander, US Army Electronics Command,ATTN: AMSEL-MA-CW, Fort Monmouth, NJ.,07703.

(3) Allowance quantities are indicated in thespecial tools list section for special tools, TMDE,and other support equipment.

g. 30-Day DS/GS Maintenance Allowances.(1) The repair parts indicated by asterisk

entries in separate allowance columns for DSrepresent those authorized for use at thatcategory of maintenance to be requisitioned on an“as required” basis, until stockage is based ondemand in accordance with AR 710-2.

(2) Allowance quantities are indicated in thespecial tool lists section for special tools, TMDE,and other support equipment.

h. 1-Year Allowances Per 100 Equipments/Contingency Planning Purposes. Column inten-tionally left blank.

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i. Depot Maintenance Allowance Per 100Equipments. Not applicable.

j. Illustration.(1) Figure number. Indicates the figure

number of the illustration on which the item isshown.

(2) Item number. Not applicable.

A4-4. Special InformationUsable on codes are included in column 3.Uncoded items are applicable to all models.Identification of the usable on codes used in thispublication are —

Code Used onB6K H-161/UB6P H-161A/U

A4-5. Location of Repair Partsa. This manual contains one cross-reference

index (sec VII) to be used to locate a repair partwhen either the Federal stock number or refer-ence number (manufacturer’s part number) isknown. The first column in the index is preparedin numerical or alphanumeric sequence in ascend-ing order. The reference numbers (manufactur-er’s part numbers) are listed immediately follow-

ing the last listed Federal stock number in theindex of Federal stock numbers.

b. When the Federal stock number or referencenumber is known, follow the procedures given in(1) and (2) below.

(1) Refer to the index of Federal stocknumbers (sec VII), and locate the Federal stocknumber or reference number. The FSN andreference number are cross-referenced to theapplicable figure and item number or referencedesignation.

(2) Refer to the repair parts list (sec III and V)and locate the figure number (col 7a — 20P,10a — 34P) and item number or reference desig-nation (col 7b — 20P, 10b — 34P) as noted in theFSN index.

c. When the figure and item number orreference designation are known, scrutinize col-umns 7a and 7b — 20P and 10a and 10b — 34P, ofthe repair parts list (sec III and V) until the item islocated.

d. When the FSN, reference number, figurenumber, and item number are not known,scrutinize column 3 of the repair parts list (sec IIIand V), which is arranged in alphabetical order.

A4-6. AbbreviationsNot applicable.

(Next printed page is A4-6)

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By Order of the Secretary of the Army:

Official:J. C. LAMBERT,Major General, United States Army,The Adjutant General.

Distr ibut ion:A c t i v e A r m y :

USASA (2)CNGB (1)CC-E (7)Dir of Trans (1)CofEngrs (1)TSG (1)CofSptS (1)USAAESWBD (5)USAIB (5)USACDCEC ( 10)USACDCEA (1)USACDCCBRA (1)USACDCCEA (1)USACDCCEA (Ft Huachuca) (1)USACDCOA (1)USACDCQMA (1)USACDCTA (1)USACDCADA (1)USACDCARMA (1)USACDCAVNA (1)USACDCARTYA (1)USACDCSWA (1)USAMC (5)USCONARC (5)ARADCOM (5)ARADCOM rgn (2)OS Maj Comd (4)USAMERCC (5)USAECOM (30)LOGCOMD (2)USAMICOM (4)USAMC (2)USASCC (4)MDW (1)Armies (2) except

7th USA (5)EUSA (5)

Corps (2)USAC (3)11th Air Aslt Div (3)507th USASA Gp (5)

508th USASA Gp (S)318th USASA Bn (5)319th USASA Bn (5)320th USASA Bn (5)177th USASA Co (5)182nd USASA Co (5)183rd USASA Co (5)184th USASA Co (5)Instl (2) except

Ft Monmouth (70)Ft Hancock (4)Ft Gordon (10)Ft Huachuca ( 10)WSMR (5)Ft Carson (25)Ft Knox (12)

Svc Colleges (2)Br Svc Sch (2) except

USASESCS (40)USATC Armor (2)USAECFB (2)USATC Inf (2)USASTC (2)Army Dep (2) except

LBAD ( 14)SAAD (30)TOAD ( 14)FTWOAD ( 10)LEAD (7)SHAD (3)NAAD (5)SVAD (5)CHAD (3)ATAD (10)ERAD (5)

Gen Dep (2)Sig.Sec, Gen Dep (5)Sig Dep (12)WRAMC (1)Army Pic Cen (2)USAATC (5)

HAROLD K. JOHNSON,General, United States Army,Chief of Staff.

Sig FLDMS (2)AMS (1)USAERDAA (2)USAERDAW (18)USACRREL (2)1st GM Bde (5)USA Rsch Spt Gp ( Ft Belvoir)

(5)DPG (5)Units organized under the follow-

ing TOE’s—2 each:1-7 5-1561-37 5-1571-55 5-2141-75 5-2251-76 5-2261-77 5-2271-78 5-3481-107 5-500(AA-1-207 AD)1-307 6-373-7 6-1003-266 6-1013-267 6-1555-25 6-1565-26 6-1575-27 6-1595-35 6-1655-36 6-1665-37 6-1675-52 6-1685-54 6-1695-77 6-1755-78 6-1765-115 6-1775-116 6-1855-145 6-1865-146 6-200

5-147 6-2015-148 6-2155-155

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6-2166-2176-2196-2256-2266-2276-228

6-3156-3166-3176-3276-3286-345

6-3476-349

6-357

6-3596-4016-4156-4166-4176-4196-425

6-4276-4356-4366-4376-4396-445

6-5016-5256-5456-555

6-557

6-5586-5756-5766-5776-6156-6166-6176-619

77–27-47-117-127-157-167-177-187-197-257-267-277-357-377-427-457-467-477–1007-1028-358-368-378-658-678-778-1228-1268-1278-1288-1378-1479-7

9-229-479-579-769-879-1279-1679-2179-2279-51010-710-1710-4510-4610-4710-4810-33710-40710-44911-811-3211-3511-3611-3711-3811-3911-5611-5711-5811-6711-6811-8511-8611-8711-9511-9611-9711-9811-11711-13711-15511-15711–158

11-21511–21611–21711-21811-33711-500

(AA-AC)11-58711-59211-59712-3712-1571717–417-1517-1717–2717-3217-3517-3617-3717-4217-5117-5217-5517-5617-5717-6617–7517-7617–7717–7817-10017-10217-10517-10617-10717–10819-2719-3519-3719-6719-217

19-500(AA-AE)

29-129-229-529-629-1129-1529-1629-1729-2129-2529-2626-27

29-3729-45

29-5129-52

29-57

29-7529-30729-40729-70130-530-630-1730-1830-2531–10532-5232-5632-5732-6732-6832-7732-78

32-500

(AA-AC)3737-437-4237-10037–10239-5144-244-1244-23544-23644-23755-1255-1655-1755-1855-2755-28

55-47

55-57

55-87

55-8955-9755-9955-12855-13855-13955-14055-45855-500

(AA-AE)5757-457-4257-100

NG: State AG (3) ; units-same as Active Army except allowance is one (1) copy each.USAR: N o n e .For explanation of abbreviations used, see AR 320-50.

✩ U.S. GOVERNMENT PRINTING OFFICE: 1994 - 342-421/81134

PIN : 014504-000