d. Clean the front panel, meters, and
switches; use a soft clean cloth. If necessary,
Inspect the exterior of the equipment. The
dampen the cloth with water; mild soap may
exterior surfaces should be free of dirt, grease,
be used for more effective cleaning.
a. Remove dust and other loose dirt with a
3-9. Touchup Painting Instructions
clean soft cloth.
Remove rust and corrosion from metal sur-
Warning: Prolonged breathing of cleaning
faces by lightly sanding them with fine sand-
compound is dangerous; make certain that
paper. Brush two thin coats of paint on the
adequate ventilation is provided. Cleaning
bare metal to protect it from further corrosion.
compound is flammable; do not use near a
Refer to the applicable cleaning and refinishing
flame. Avoid contact with the skin; wash off
practices specified in TB SIG 364.
any that spills on your hands.
b. Remove grease, fungus, and ground-in
dirt from the case; use a cloth dampened (not
wet) with Cleaning Compound (FSN 7930-
a. General. The troubleshooting chart ( b
below) will help locate trouble in the power
c. Remove dirt from plugs and jacks with a
supply. Only those corrective measures are
given which the unit repairman can accomplish.
If the corrective measure does not restore nor-
Caution: Do not press on the meter faces
mal equipment performance, higher category of
(glasses) when cleaning; the meters may be-
maintenance is required.
b. Troubleshooting Chart.
Check power output. If correct, replace
DC OUTPUT indicator
Defective indicator lamp or no
lamp does not illumi-
Check for loose connection in output
VOLTAGE meter does
Connections to meter faulty or
circuit. Check connections to meter.
not indicate properly.
If meter connations are not faulty,
higher category maintenance is re-
Connections to meter or to PUSH Check for loose connections at meter
CURRENT meter does
and switch. If connections are nut
TO INDICATE switch faulty
not indicate properly.
faulty, higher category maintenance
With INPUT POWER
Higher category maintenance is re-
Defective circuit breaker switch.
circuit breaker switch
set to OFF, CUR-
RENT mater does not
indicate 0 and indicator
lamp does not ex-
INPUT POWER circuit
a. Overload ------------------ a . Disconnect from input power, and
breaker trips exces~
check wire and jumper connec-
b. Higher category maintenance is re-