Failure of the Indication of the Battery Voltmeter 1 or 2

TASK 24-38-00-810-849-A
Failure of the Indication of the Battery Voltmeter 1 or 2

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 24-37-21-000-001	Removal of the Voltmeters
AMM 24-37-21-400-001	Installation of the Voltmeters
AMM 31-21-21-000-001	Removal of the Clock
AMM 31-21-21-400-001	Installation of the Clock
ASM 331402
AMM 34-57-22-000-001	Removal of the VOR/DME RMI
AMM 34-57-22-400-001	Installation of the VOR/DME RMI

3. Fault Confirmation
Subtask 24-38-00-710-134-A

A. Test
(1) On the ELEC panel 35VU, the battery voltmeter 1 or the battery voltmeter 2 shows the indication 888.

4. Fault Isolation
Subtask 24-38-00-810-104-A ** ON A/C NOT FOR ALL

A. If the test confirms the fault:

make sure that the INT LT/ANN LT switch (33LP) is in the BRT or DIM position
do a check of the status of the auxiliary contact of the INT LT/ANN LT switch (33LP) between pin 3D and pin 1D (normally open) ASM 331402.

(1) If the contact is closed:

(2) If the contact is open:

do a check of the wiring ASM 331402 for a short to ground between:
. pin 3D of the INT LT/ANN LT switch (33LP) and pin H of the battery voltmeter 1 (3PV1)
. pin 3D of the INT LT/ANN LT switch and pin H of the battery voltmeter 2 (3PV2)
. pin 3D of the INT LT/ANN LT switch and pin A/J of the clock (2FS)
. pin 3D of the INT LT/ANN LT switch and pin A/d of the VOR/DME RMI (11FN).

(a) If the wiring is not correct:

(b) If the wiring is correct:

1 If the fault continues:

a If the fault continues:

replace the CLOCK [2FS] AMM 31-21-21-000-001 and AMM 31-21-21-400-001.
. If the fault continues:
- replace the RMI-VOR/DME [11FN] AMM 34-57-22-000-001 and AMM 34-57-22-400-001.

Subtask 24-38-00-810-104-D ** ON A/C NOT FOR ALL