Table 1. Panel Light Circuits Troubleshooting Procedures.

TM 9-2320-303-24-1

Table 1. Panel Light Circuits Troubleshooting Procedures.

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Heater Control Light Not Operating, Other 1. Check heater control lamp.

If defective, replace lamp (WP

Heater Circuits Operating Normally.

0069 00).

2. Check for continuity between If continuity is indicated, go to

socket and ground.

step 3. If no continuity is

indicated, repair ground lead.

3. Disconnect lead 29A from

If +12 VDC is present, repair lead

heater control light. Check for

29A to heater control light. If no

+12 VDC at lead 29A from

voltage is present, repair lead 29A

panel fuse.

from fuse.

One Or More Gage Lights Not Operating.

Check panel gage lamp(s).

If defective, replace lamp(s) (WP

0062 00, WP 0063 00, and WP

0064 00).

Fiber Optics Not Operating.

1. Check fiber optic light source If damaged, replace lamp (WP

lamp.

0071 00).

2. Check for continuity between If continuity is indicated, go to

lamp socket and ground.

step 3. If no continuity is

indicated, repair ground lead.

3. Disconnect power lead to fiber If +12 VDC is present, replace

optic light source. Check for fiber optic light source light (WP

+12 VDC at power lead.

0071 00). If no voltage is present,

repair power lead.

Panel Lights Do Not Dim.

Disconnect lead 420B from

If +12 VDC is present, replace

electronic dimmer switch. Check

main light switch (WP 0065 00).

for +12 VDC at lead 420B with

If no voltage is present, replace

main light switch in dim mode.

electronic dimmer switch (WP

0067 00).

Panel Lights Do Not Brighten.

Disconnect lead 420B from If +12 VDC is present, replace

electronic dimmer switch. Check main light switch (WP 0065 00).

for +12 VDC at lead 420B with

main light switch in bright mode.

0010 00-31