Section III. MAINTENANCE PROCEDURES

TM 11-5820-765-34

Section

III.

MAINTENANCE

PROCEDURES

3 - 5 . REMOVING AND REPLACING CIRCUIT CARD ASSEMBLY PC101(A1)

REMOVE

Remove top panel:

R e m o v e 15 machine screws, nuts, washers.

Disconnect fan motor plug.

Remove

retaining

bracket

nuts,

washers.

Remove

retaining

brackets.

Lift circuit card assembly straight up from socket.

CAUTION

Be careful not to break solder connections

when pulling the circuit card.

REPLACE

Insert circuit card into socket.

Be sure that the circuit card terminal points are

set all the way into the socket.

Replace retaining brackets, nuts,

washers.

REPAIRING CIRCUIT CARD ASSEMBLY PC101(A1) (figs. 1 and 2)

3-6.

Removing

Protective

Coating

Adequate ventilation should be provided while using TRICHLOROTRIFLUOROETHANE. Pro-

longed breathing of vapor should be avoided. The solvent should not be used near heat or

open flame; the products of decomposition are toxic and irritating. Since TRICHLOROTRI-

FLUOROETHANE dissolves natural oils, prolonged contact with skin should be avoided.

When necessary, use gloves which the solvent cannot penetrate. If the solvent is taken

internally, consult a physician immediately.

CAUTION

Before starting repairs, remove protective coating EC1103 from the circuit card assembly:

Isolate

the

area

repaired.

I f this area is small, scrape off the protective coating with a knife or other sharp tool.

If this area is large, soak the circuit card in TRICHLOROTRIFLUOROETHANE to soften

the coating, then wipe the area clean with a lint-free cloth.

3-6