Loss of the RMP 2 Data on the Bus 1 (VHF 3 System Source)

TASK 23-13-00-810-810-A
Loss of the RMP 2 Data on the Bus 1 (VHF 3 System Source)

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-12-00-740-001	BITE Test of the VHF System
ASM 231302
AMM 23-13-13-000-001	Removal of the Radio Management Panel (RMP)
AMM 23-13-13-400-001	Installation of the Radio Management Panel (RMP)

3. Fault Confirmation
Subtask 23-13-00-865-055-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	COM NAV/RMP/2	2RG2	L02

Subtask 23-13-00-860-059-A

B. Job Set-up
On the RMP 2 only, make sure that the ON/OFF switch is at ON.

Subtask 23-13-00-740-068-A

C. Test
(1) Do the BITE test of the HF system AMM 23-12-00-740-001.

NOTE: Do this test for the VHF 3 only.

4. Fault Isolation
Subtask 23-13-00-810-059-F

A. If the test confirms the fault:

Replace the RMP-COM/NAV FREQ SEL, 2 [1RG2] AMM 23-13-13-000-001 and AMM 23-13-13-400-001.

(1) If the fault continues:

Do a check and repair the wiring of the COM 1 DATA OUTPUT signal (from the RMP 2 (1RG2) pins A/<P, <Q to the first terminal block) ASM 231302.

Subtask 23-13-00-740-069-A

B. Do the test given in Para. 3.C.

[Rev.8 from Aug 2018] 2026.04.04 04:25:40 UTC