TM 55-1730-229-12
AC 320A0-OMM-000
TO 35C2-3-473-1
TM 1730-12/1
Table 4-2.
Organizational Troubleshooting (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
(continued)
43.
Step 3.
Shut down engine and disconnect battery. Remove battery charger
access cover. Disconnect main harness connector P7 from control
panel connector J7. Lower control panel (paragraph 4-24.a), and
disconnect harness connector P12 (36, figure 4-38) from GCU. Check
for continuity between the following points (see FO-6 sheet 2):
If no continuity,
Check continuity
replace wire no.
From
To
X20C20
1S10-2
1S12-2
X20B20
J7-13R
1S10-2
X20A20
P7-13L
P12-S
a. If no continuity, replace indicated wire.
b. If all continuity checks good, replace GCU (paragraph 4-54).
c. Perform operational check.
Check DC VOLTAGE FAULT indicator.
Step 4.
a. If indicator is now off, continue operation if no abnormal
indications are observed.
b. If DC VOLTAGE FAULT lights again, perform applicable steps
based on indications following:
c. If DC VOLTS meter registered no voltage and DC POWER ON
indicator did not light before voltage fault, do step 5.
d. If DC OVER CURRENT indicator lit before voltage fault, do
step 9.
e. If DC VOLTS meter read in or above green band before voltage
fault, go to step 10.
f. If DC VOLTS meter read low (less than 20 vdc) before voltage
fault, go to step 13.
4-69
