If the Pilot Light Works and the Interior Light Does Not

TM 10-4110-262-13&P

0018 00

If the Pilot Light Works and the Interior Light Does Not

1. To check the bulb in the interior light fixture:

a. Disconnect the IC power supply cable from the IC power entry connector to de-energize the IC

electrical system.

b. Loosen the setscrew at the base of the protective cage. Unscrew the cage from the fixture.

Remove the cage and set it aside.

Unscrew the lens from the fixture. Set the lens aside.

d. Remove the light bulb from the fixture. Check the bulb for continuity.

e. If there is continuity in the bulb, go to Step 2 of this section.

If there is no continuity, replace the bulb (See Work Package 0017 00).

g. Reconnect power to the system and switch the light on to confirm the fault is corrected. Reinstall

the lens and protective cage.

CAUTION

Use caution when checking the line circuit. Do not short out meter leads.

Failure to comply may cause damage to equipment.

2. If there is continuity in the light bulb, check the fixture:

a. Restore power to the light fixture and measure the voltage between the center terminal (hot) and

the threaded side (neutral) of the light socket.

b. The voltage should be zero with the switch off and full line voltage with the switch on.

If you do not have full line voltage when the switch is on, replace the light fixture (see Work

Package 0020 00).

3. If voltage is not present at the IC power entry connector confirm that 208/230 VAC, 50-60 Hz is

supplied to the RU main power connection. If not, connect power to the RU and check voltage at the

IC power entry connector. If voltage is present, return the ADR-300 to service.

0018 00-3