TM 11-6625-1696-12
5-7.
Touchup Painting Instructions
checks until an abnormal condition or result is observed.
Remove rust and corrosion from metal surfaces by
When an abnormal condition or result is observed, the
lightly sanding them with fine sandpaper. Brush two thin
References column refers to the appropriate
coats of paint on the bare metal to protect it from further
symptom(s) in the troubleshooting chart. If no reference
corrosion. Refer to applicable cleaning and refinishing
is given, higher category of maintenance is required. If
practices specified in TB 43-0118.
the corrective measures listed in the troubleshooting
5-8.
Organizational Troubleshooting Chart
chart do not result in correction of the trouble, higher
a. General.
The troubleshooting chart is
contains additional troubleshooting and replacement
based on the checks contained in the quarterly
information.
preventive maintenance checks and services chart
b. Troubleshooting.
Item No.
symptom
Probable cause
Checks and Corrective measure
POWER SUPPLIY
PP-6304/GRM-95(V)2
1
AC POWER indicator does not light
Defective lamp .............................
Check lamp; replace as necessary
and VOLTS meter indicates 115
volts.
2
AC POWER indicator does not light
Defective lamp .............................
Check fuses; replace as necessary
and VOLTS meter does not indicate.
TEST FACILITY,
GRM-95(V)2
3
POWER section AC indicator does
Defective lamp .............................
Check lamp; replace if necessary
not light.
4
One or both POWER section + 12 V
Defective lamp(s) .........................
Check lamp(s); replace if necessary
and + 28 V indicators do not light.
POWER section + 12 V and + 28 V in- a. Defective interlock ...................
5
dicators do not light and fan does
not run.
b. Defective time delay assemblyb. Check power supply metering
ON. If power supply metering in-
dications are zero, and PWR SUP
TEST indicator does not light, set
S1 and S2 to off position and replace
c. Defective power supply sub- ....
c. Replace power supply (para 26b).
assembly.
a. Defective interlock ...................
a. Check interlocks ......................
6
b. Defective fan ...........................
c. Defective power supply sub- ....
c. Replace power supply (para 26b).
assembly.
d. Defective cable assembly 457-565. d. Replace cable assembly 457-565
7
Power supply metering abnormal
Defective power supply subassembly. Replace power supply (para 5-26b).
8
26 V SUPPLY section indicator does
Defective lamp .............................
Check lamp; replace as necessary
not light.
9
26 V SUPPLY section indicator does
Defective fuse ..............................
Check fuse; replace as necessary
not light and 0 volt at J14 and J59.
10
PWR SUP TEST indicator does not
Defective lamp .............................
Check lamp; replace as necessary
light.
11
600 volts metering abnormal
Defective power supply subassembly . Replace powr supply (para 26b).
12
LOW PRW indicator does not light
Defective lamp .............................
Check lamp; replace if necessary
a. Defective lamp ........................
13
AMPL FREQ MULTIPLIER
Check lamp; replace if necessary
SYNC indicator does not light.
b. Defective synthesizer...............
5-11