ARMY TM 9-6115-464-34
AIR FORCE TO 35C2-3-445-2
NAVY NAVFAC P-8-624-34
c. Cleaning, Inspection, and Repair.
WARNING
Solvent, Dry Cleaning P-D-680, Type II is flammable and moderately toxic to skin,
eyes and respiratory tract. Eye and skin protection required. Good general ventilation
is normally adequate. Failure to observe this warning could result in servere personal
injury or death.
WARNING
Compressed air used for cleaning and drying purposes can create airborne particles
that may enter the eyes. Pressure shall not exceed 30 psig and use only with adequate
chip guards and chipping goggles.
Failure to observe this warning could result in
servere personal injury or death.
(1) Clean all metallic, non-electrical parts with dry cleaning solvent (Federal Specification P-D-680)
and dry with filtered compressed air.
(2) Clean electrical components with filtered compressed air and a soft bristle brush. If necessary,
electrical components may be cleaned with a clean, lint–free cloth moistened with an approved
solvent.
(3) Visually inspect housing and cover plates for cracks, corrosion, warping, and other damage.
(4) Inspect panel assembly as follows:
(a) Check panel for cracks, corrosion, warping, illegible markings and other damage.
(b) Inspect indicator lights for cracked, or damaged lens, defective lamp, and corroded or damaged
b a s e.
(c) Inspect fuse holder assembly for cracked or damaged cap, defective fuse, and burned, cracked, or
corroded fuse holder.
(d) Inspect, test, or reset switch for cracks, corrosion, and evidence of shorting.
(e) Check continuity of test or reset switch using figure 3-61 as a guide.
(5) Inspect component board assembly for burned components, damaged wires and cracked or broken
board.
(6) Test individual components of component board using figures 3-61 and 3-62 and table 3-4 as a
guide.
NOTE
Disconnect one lead to component being tested to avoid erroneous test readings.
(7) If any circuit board component must be replaced or encapsulating coating repaired or replaced, refer
to Appendix A references for detailed procedures. Repair/replace encapsulation by applying a 0.007
inch (minimum) coating of polyurethane resin (Scotchcoat 221, Minnesota Mining and Mfg. Co., or
equal).
NOTE
Prior to coating, deaerate resin by evacuating at room temperature to between 5 and
10 Hg absolute to remove air bubbles.
3-139
