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
(continued)
11.
b.
If bulbs were good, do step 5.
Test PANEL LIGHTS switch 1S6 (see malfunction 79).
Step 5.
a. Replace switch if defective (paragraph 4-104.c), and perform
operational check.
If switch test was good, do step 6.
b.
Step 6.
Check wire L6B20N between right panel lamp socket negative terminal,
and GND TB (2, figure 4-20).
a. Replace wire if defective, and perform operational check.
If wire is good, do step 7.
b.
Step 7.
Disconnect main harness connector P8 from lower tray connector J8.
Check wire L3C20 between P8-T and right panel lamp socket positive
terminal.
Replace defective wire. Reconnect connector, and perform
operational check.
Step 8.
Set MASTER SWITCH to OFF and disconnect battery. Test PANEL LIGHTS
switch 1S6 (see malfunction 79).
a. Replace switch if defective (paragraph 4-104.c), and perform
operational check.
If switch is good, do step 9.
b.
Step 9.
Check voltage regulator 3VR1 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 Xl scale, measure resistance between
voltage regulator 3VR1 mounting screw (6, figure 4-28) and
either of two pins (10). If resistance is greater than 25
ohms, replace regulator 3VR1 (paragraph 4-37), and perform
If resistance is less than 25 ohms
operational check.
(regulator good), check wiring per step b.
4-39
