CHAPTER 4 REPAIR INSTRUCTIONS

TM 9-1260-477-34

CHAPTER 4

REPAIR INSTRUCTIONS

Section I. REPAIR OF LD/R

4-1. GENERAL

When units Al and A2 are separated, unit

This section contains repair procedures for the LD/R.

Al must be placed on any convenient object

The tools, equipment,

and materials required to

to keep it the same height as unit A2 to

perform these procedures are contained in Table 2-1,

Table B-1, and in the Laser Systems Field Maintenance

avoid strain on cable A1A1W1 between units.

Tool Kit (NSN 5180-01-048-8570).

The time required

NOTE

for each repair task is listed in the Maintenance

Allocation Chart found in TM 9-1260-477-12.

For proper cooling tape plenum outlet on A2

visible when A1 is separated from A2. Tape

4-2. LD/R ELECIRONICS ASSEMBLY A1 AND TRANSCEIVER

must be removed before reassembly.

ASSEMBLY A2 REPAIR

The optical components of the LD/R are

easily contaminated.

Use extreme caution

to keep free from dust, smoke, or other

foreign matter.

Voltages in excess of 900 VDC exist at

Power Supply Control A1A1A1, Control Card

A1A1W1P1 and A2A2W1J1 pin 61 for approx-

minutes after power is

three

imately

A1A3, Resolver-to-Digital Converter A1A4,

removed.

Energy Control Card A2A1A6, and Receiver

Circuit Card A2A4 are electrostatic sensi-

Protect these cards by wearing

tive.

grounding wristband when probing. Handl-

individual

ing and/or installation of

cards should be performed at a static-free

Insure screws are released evenly one turn

work station. These cards should be anti-

at a time to avoid damaging connector.

static packaged during handling and stor-

age.

NOTE

Do not use any items that may damage mating

When using Table 3-3 thru 3-21, do not

surfaces or gasket seal between A1 and A2.

perform steps 4-2a.(3) thru 4-2a.(8) unless

Do not use cotton rags or other wiping

instructed by the applicable table.

materials with lint.

A1A1W1P1 from A2A2W1J1 by

(3) Disconnect

Working area inside the maintenance van

releasing two jackscrews evenly one turn at a time.

must be clean before opening the LD/R.

(4) Check exposed surface of gasket. If damage

is evident, proceed to step (5).

If gasket is in

a. Removal (Figure 4-1).

good condition, proceed to step (8).

(5) Remove gasket from groove in A1 mating

surface.

(6) Lubricate a new gasket seal with lubricant

(28, Table B-1) and install in groove of A1.

Insure that LD/R and Fault Locator POWER

(7) Remove excess lubricant from exposed surface

OFF prior

to performing

switches are

of gasket seal.

disassembly of LD/R.

(8) Inspect mating surfaces of A1 and A2 for

signs of damage or obstructions that may cause an

(1) Remove 12 screws, lockwashers, and washers.

improper pressure seal.

Change 2

4-1