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TECHNICAL MANUAL

DS AND GS MAINTENANCE MANUAL

F A U L T I S O L A T I O N I N S T R U C T I O N S

F O R I R T R A N S M I T T I N G S E T M 8 9

DRAGON MEDIUMANTITANK/ASSAULT WEAPON SYSTEM

HEADQUARTERS, DEPARTMENT OF THE ARMY

JULY 1982

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SAFETY SUMMARY

The following are general safety precautions that personnel must understand and apply during operation

and maintenance.

KEEP AWAY FROM LIVE CIRCUITS

Operating personnel must observe safety regulations at all times. Do not replace components or make

adjustments inside the equipment with high voltage present. Under certain conditions, dangerous

potentials may exist when the power control is in the OFF position. To avoid injury, remove power and

discharge and ground a circuit before touching it.

DO NOT SERVICE OR ADJUST ALONE

Under no circumstances should any person reach into the enclosure for the purpose of servicing oradjusting the equipment except in the presence of someone who is capable of rendering aid.

RESUSCITATION

Personnel working with or near high voltages should be familiar with modern methods of resuscitation.

WARNING

Personnel must wear safety goggles when destroying the I R lamp assembly to prevent eye damage or loss

of sight.

The lamp bulb in the I R source is pressurized to about 215 psi. Safety goggles shall be worn and a

protective shield for the body (such as plexiglass panel) shall be used whenever disassembly beyond the

filter retainers (i.e., within the housing) is necessary. If lamp bulb is to be handled, light gloves shall be

worn. Failed bulbs shall be disposed of by enclosing them within a thick plastic bag before breakingwith a tool with a fIat surface such as a shovel. Disposal techniques similar to those for cathode ray

tubes are recommended.

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Technical Manual   ))

No. 9-6920-483 -34-2   )

DS AND GS MAINTENANCE

*TM 9-6920-483

HEADQUARTERS,

DEPARTMENT OF THE A

Washington, D. C., 27 July

MANUAL:

FAULT ISOLATION INSTRUCTIONS FOR IR TRANSMITTING SET M89

(DRAGON MEDIUM ANTITANK/ASSAULT WEAPON SYSTEM)

CHAPTER 1. INTRODUCTION

Purpose and scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Troubleshooting procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Forms, records, and reports. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Security responsibilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reports of equipment manual improvements . . . . . . . . . . . . . . . .

CHAPTER 2. FAULT ISOLATION

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Test sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Special equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Repair parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Paragraph

1-1

1-21-31-41-5

2-12-22-32-4

*This manual supersedes TM 9-6920-483-34-2, 31 January 1977, including

a l l c h a n g e s .

i/(ii blank)

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TM 9-6920-483-34-2

CHAPTER 1

INTRODUCTION

1-1. PURPOSE AND SCOPE.

This manual contains fault isolation instructions for, the direct support and general support maintenanceof the M89 infrared transmitting set.

1-2. TROUBLESHOOTING PROCEDURES.

Troubleshooting and testing of the training equipment and subassemblies will be accomplished by theprocedures contained in chapter 2, and the schematics in TM 9-6920-483-34-1.

1-3. FORMS, RECORDS, AND REPORTS.

All personnel and organizations responsible for operating and/or maintaining this equipment are alsoresponsible for the preparation and disposition of appropriate forms, records, and reports.

1-4. SECURITY RESPONSIBILITIES.

a. The security classification of the DRAGON Weapon System Equipment is UNCLASSIFIED.Portions of data relative to the DRAGON system are classified.

b. The importance of security of classified material cannot be overemphasized. Security is anindividual as well as a Command responsibility.

c. Safeguarding of classified material will be accomplished in accordance with current directives.

1-5. REPORTS OF EQUIPMENT MANUAL IMPROVEMENTS.

Reports of errors, omissions, and recommendations for improving this publication by the individualuser are encouraged. U.S. Marine Corps reports should be submitted on Form NAVMC 10772 inaccordance with MCO 5600.4 — All other should be submitted on DA Form 2028, RecommendedChanges to Publications, and forwarded directly to: Commander, U.S. Army Missile Command, ATTN:DRSMI-SNPM, Redstone Arsenal, Alabama 35898.

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TM 9-6920-4

CHAPTER 2

FAULT ISOLATION

2-1. GENERAL.

a. This procedure is designed to be used by an electronics technician when the target source fails toperform correctly.

b. We strongly recommend that you start at the beginning of thenot skip or omit anything unless instructed, because the procedure isin this sequence.

2-2. TEST SEQUENCE.

Test sequences referenced in the procedure are:

“Troubleshooting The Power Supply Modulator” Instructions . . . . . .Lamp - “Failure to Modulate” - Instructions . . . . . . . . . . . . . . . . . . . .“Troubleshooting the PCA Card” Instructions . . . . . . . . . . . . . . . . . .

Output Power Calibration Instructions . . . . . . . . . . . . . . . . . . . . . . . .

2-3. SPECIAL EQUIPMENT.

Two pieces of special equipment required to perform these tests are:

procedure and work through, anddesigned to work effectively only

. . . . . . . . . . . begin on page 2-10

. . . . . . . . . . . begin on page 2-27

. . . . . . . . . . . begin on page 2-30

. . . . . . . . . . . begin on page 2-46

Tektronix type 422 oscilloscope -or- equivalent (with a compensated probe)Fluke digital multimeter, type 853A-03 -or- equivalent

Additional piece of equipment required to perform PSM Output Power Calibration

Variable power supply 24 Vdc to 30 Vdc @ 30 Amps.

2-4. REPAIR PARTS.

Refer to TM 9-6920480-24P-1 for repair parts.

2-1

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TM 9-6920-483-34-2

TO perform repairs on the TARGET SOURCE (TS)& the POWER SUPPLY MODULATOR (PSM)

YOU need to understand each unit’s purpose& the functions it provides.

The TARGET SOURCEhouses/ cool s t he Xenon l amp

& provi des opti cal fi l teri ng for the radi ated li ght

  BEFORE ANY ELECTRICAL TESTING ALWAYS USE E12 & E13 FOR GROUND CONNECTIONtest all cables for continuity between appropriate pins

for shorts between adjacent pins0

TO OBSERVE WAVE-FORMS• IF ANY TEST FAILS TO FIND FAULTY COMPONENT use Tektronix 422 oscilloscope or equivalent

look for circuit wiring “OPENS”look for circuit wiring ERRORS

use a compensated probe

look for circuit wiring “SHORTS”0

FOR DC VOLTAGE MEASUREMENT & CONTINUITY CHECKS• A FAILURE NOT UNCOVERED BY INSTRUCTIONS (during testing) use Fluke Digital Multimeter or equivalent

is cause to continue the test series (if possible)as the failure is likely located by a later test • ALL RESISTANCE VALUES ARE IN OHMS

• VOLTAGE READINGS ARE TO GROUND

2-2

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The POWER SUPPLY MODULATORprovi des cooli ng f or it self provi des the l amp

wi th regul ated/ modul ated power and i ts monit ori ng& wi th controll ed boost vol tage for starti ng

has a DC-t o-DC converterhas a modul ati on and power control cardhas current and vol tage contr ol & swi tchi ng for l amp starti ng

arc stabi l i zi ng& normal operati on.

GENERAL STRATEGY 

FI RST i sol ate t he problem to t he TARGET SOURCE(TS)or POWER SUPPLY MODULATOR(PSM)

I F BOTH ARE FAULTY - repai r t he PSM f i rst .

SECOND determi ne those basi c funct i ons not operati ng normal l y.

THI RD i sol ate the fai l ed componentby checking the operati on of al l mi nor ci rcui t f uncti ons

contri buti ng to the faul ty basi c f uncti on.

26V power cable l eads

2-3

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By Order of the Secretary of the Army:

E. C. MEYERGeneral, United States Army

Chief of Staff 

Official:

ROBERT M. JOYCE Brigadier General, United States Army

The Adjutant General 

D i s t r i b u t i o n :

These copies are for s tockage only to be is sued upon reques t for Fore ignMil i ta ry Sales Cases .

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PIN: 015062-0

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