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Page Title:
Table 5-1. Direct Support Troubleshooting Chart-Continued |
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 TM 11-5895-1179-13 EE132-EA-OMP-010/E106 KY883 TO 31S1-2GSC-161
Table 5-1. Direct Support Troubleshooting Chart-Continued
Item
Checks and
No.
Symptom
Probable Cause
Corrective Action
c. Defective ON/OFF
c. Disconnect POWER cable at
switch assembly A6A4,
A5J13. Set ON/OFF switch
fuseholder assembly
to ON. Make continuity
A6A4, bottom panel
checks of ON/OFF switch
harness assembly A7W1,
assembly, fuseholder
or terminal board(s)
assembly A6A3, bottom
A7TB1 and A7TB2.
panel harness assembly
A7W1 and terminal
board(s) A7TB1 and
A7TB2 (figure 5-2). Re-
place bottom panel wiring
harness A7Wl (paragraph
bly (paragraph 5-8), ON/
OFF switch assembly
(paragraph 5-9) or ter-
minal board(s) A7TB1 and
A7TB2 (paragraph 5-28).
3
When ON/OFF
a. Defective fan assembly
a. Check for +28 Vdc at ter-
switch is
A5B1
minals 9(-) and 11(+) on
set to ON,
A7TB1 (figure 5-2). If
fan does
voltage is present,
not start
replace fan assembly
but POWER
indicator
b. Defective diode A7CR3
b. Check voltage at E2(+)
illuminates.
or capacitor A7C2.
with A7TBl-9(-) for +28
Vdc +5 Vdc. If voltage
is present, replace
diode A7CR3 (paragraph
4
When ON/OFF
a. Defective display and
a. Replace display and
switch is
control circuit card
control circuit card
set to ON,
assembly A6A1.
assembly A6A1
POWER indi-
cator does
b. Defective capacitor
b. Replace defective capa-
not illumi-
A7C1.
citor A7C1
nate but
fan starts.
c. Defective transformer
c. Replace transformer
A7T1.
d. Defective backplane
d. Replace backplane cir-
circuit card assembly
cuit card assembly A5A1
A5A1.
e. Defective bottom panel
e. Replace bottom panel
harness assembly A7W1.
harness assembly A7W1
f. Power supply plug-in-
f. Set ON/OFF switch to OFF.
circuit card assembly
Release the four front
A4 not properly seated.
panel assembly fasteners
and lower the front
5-4
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