TM
55-1730-229-12
AG
320A0-OMM-000
TO
35C2-3-473-1
TM
1730-12/1
Table 4-2.
Organizational Troubleshooting (continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
12.
(continued)
Step 5.
Disconnect main harness connector P9 from lower tray connector J9.
Check wire L5C20 between P9-B and engine oil utility lamp socket (47,
figure 4-12) positive (+) terminal.
Replace defective wire, and perform operational check.
Step 6.
Set MASTER SWITCH to OFF and disconnect battery. Test UTILITY LIGHTS
switch 1S7 (see malfunction 79).
a.
Replace switch if defective (paragraph 4-104.c), and perform
operational check.
b.
If switch test was good, do step 7.
Step 7.
Check voltage regulator 3VR2 and wiring as follows:
a. Open electrical trays access door and extend lower electrical
tray (paragraph 4-24.b). Using an analog multimeter (AN/PSM4
or equivalent) on X1 scale, measure resistance between
voltage regulator 3VR2 mounting screw (6, figure 4-28) and
either of two pins (10). If resistance is greater than 25
ohms, replace regulator 3VR2 (paragraph 4-371, and perform
operational check.
If resistance is less than 25 ohms
(regulator good), check wiring per step b.
b.
Remove battery charger access cover. Disconnect main harness
connector P6 from control panel connector J6, and disconnect
harness connector P9 from lower tray connector J9. Check for
continuity between the following points:
Check continuity
If no continuity,
From
replace wire no.
To
J6-R
1S7-1
L4A20
L4B20
P6-R
P9-A
J9-A
G6G20
3VR2-pin
G20A20
J9-B
3VR2-screw
Replace open wire. After replacement, reconnect all
connectors, and perform operational check.
4-42
