CIRCUIT CARD ASSEMBLY REPAIR PROCEDURES.

TM 32-5865-216-24&P

5-12.

Removal and replacement of a CCA component requires the use

of a low-wattage (30 watts or less) soldering iron and appropriate

heatsinks.

Standard shop practices, along with general practices and

precautions for CCA and microelectronic components, should be

observed when performing these repairs.

5-12.1. Power Supply CCA

Repair

Procedures. Refer to figure 5-3

for component locations.

When replacing heatsink mounted components Q2, Q5, Q6, and

CR6, lightly coat component and heatsink mating surfaces with

thermal transfer compound (item 4, Appendix D).

Apply adhesive (item 1, Appendix D) to capacitors C1, C2, C6,

C9, C10, C13, and C14 to attach them to circuit board.

Apply a continuous fillet of adhesive (item 1, Appendix D) to

area behind plug P1.

Determine type of conformal coating used on repaired CCA.

Test a small area away from components with freon TFE, TE, or

TME (item 6, Appendix I)).

If freon strips away coating,

coating is humiseal 1R31.

If it does not strip away, coating

is humiseal 1A33.

Patch conformal coating with appropriate

type of humiseal in test and repair areas. Humiseal 1A33 and

1B31 (items 10 & 11, Appendix D) are not compatible.

Patch

conformal coating only with type already present on CCA.

5-12.2. Motor Control CCA A2 Repair Procedures.

Refer to figure 5-4

for component locations.

When replacing heatsink mounted components Q1, Q2, Q3, and

Q4, lightly coat component and heatsink mating surface with

thermal transfer compound (item 4, Appendix D).

Apply a continuous fillet of adhesive (item 1, Appendix D) to

area behind plug P1.

Determine type of conformal coating used on repaired CCA.

Test a small area away from components with freon TFE, TE, or

T M E . If freon strips away coating, coating is humiseal 1B31.

Patch

If it does not strip away, coating is humiseal 1A33.

conformal coating with appropriate type of humiseal in test and

Humiseal 1A33 and 1B31 (items 10 & 11, Appendix

repair areas.

Patch conformal coating only with type

D) are not compatible.

already present on CCA.

5-35