________ R A. Do the test given in Para. 3.

 COCKPIT TO GROUND CREW CALL SYSTEM - FAULT ISOLATION PROCEDURES
_______________________________________________________________
 TASK 23-42-00-810-801
 Failure of the COCKPIT CALL Indicator Light
 1. Possible Causes
_______________
 - LGCIU-1 (5GA1)

 - IND LT-COCKPIT CALL (14WC)

 - wiring

 - RELAY-IND LT SUPPLY (6WC)

 - RELAY-L & R MLG FLT CTLD (16WC)

 - P/B SW-RESET (12WC)

 - P/B SW-CALLS/MECH (1WC)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 23-42-00-710-001 Operational Test of the Mechanic Call
 AMM 32-31-71-000-001 Removal of the LGCIU (5GA1, 5GA2)
 AMM 32-31-71-400-001 Installation of the LGCIU (5GA1, 5GA2)
 AMM 33-14-00-710-001 Operational Test of the Annunciator Light Test System

 in the Cockpit
 ASM 23-42/01

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the mechanic call (Ref. AMM TASK 23-42-00-710-001).
 4. Fault Isolation
_______________
 A. If during the operational test the COCKPIT CALL indicator light does not come on:
 - do the annunciator light test of the panel 108VU (Ref. AMM TASK 33-14-00-710-001).
 (1) If the fault continues:
 - replace the IND LT-COCKPIT CALL (14WC).
 (a) If the fault continues:
 - do a check and repair the wiring of indicator light (14WC) pins 1 to 4 and pin 5 to the terminal block (Ref. ASM 23-42/01).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞23-42-00∞∞∞∞∞∞∞∞∞∞Page 201
 Feb 01/98 CES (2) If the indicator light comes on:

 - replace the LGCIU-1 (5GA1) (Ref. AMM TASK 32-31-71-000-001) and (Ref. AMM TASK 32-31-71-400-001).
 (a) Do the test given in Para. 3. and if the fault continues:

 - replace the RELAY-IND LT SUPPLY (6WC).

 (b) If the fault continues:

 - replace the RELAY-L & R MLG FLT CTLD (16WC).

 (c) If the fault continues:

 - replace the P/B SW-RESET (12WC).

 (d) If the fault continues:

 - replace the P/B SW-CALLS/MECH (1WC).

 (e) If the fault continues:

 - do a check and repair the wiring of these components: . LGCIU1 (5GA1) . relays (6WC) and (16WC) . pushbutton switches (1WC) and (12WC) . indicator light (14WC) (Ref. ASM 23-42/01).
 B. Do the test given in Para. 3.

 TASK 23-42-00-810-803

 Failure of the Light of the MECH Transmission Pushbutton Switch on the Audio
 Control Panel
 1. Possible Causes
_______________
 - ACP-CAPT (2RN1)

 - ACP-F/O (2RN2)

 - ACP-3RD OCCPNT (2RN3)

 - AMU (1RN)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 23-42-00-710-001 Operational Test of the Mechanic Call AMM 23-51-12-000-001 Removal of the Audio Control Panel (ACP) (2RN1, 2RN2, 2RN3, 2RN4, 2RN5) AMM 23-51-12-400-001 Installation of the Audio Control Panel (ACP) (2RN1,
 2RN2, 2RN3, 2RN4, 2RN5) AMM 23-51-34-000-001 Removal of the Audio Management Unit (AMU) (1RN) AMM 23-51-34-400-001 Installation of the Audio Management Unit (AMU) (1RN) ASM 23-42/01
 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the mechanic call (Ref. AMM TASK 23-42-00-710-001).
 4. Fault Isolation
_______________
 A. If during the operational test the green bars of the MECH transmission pushbutton switch do not flash on one ACP:
 - replace the ACP-CAPT (2RN1) or ACP-F/O (2RN2) or ACP-3RD OCCPNT (2RN3) (Ref. AMM TASK 23-51-12-000-001) and (Ref. AMM TASK 23-51-12-400-001).
 B. If during the operational test the green bars of the MECH transmission pushbutton switch do not flash on all the ACPS:
 - replace the AMU (1RN) (Ref. AMM TASK 23-51-34-000-001) and (Ref. AMM TASK 23-51-34-400-001).
 (1) If the fault continues:
 - do a check and repair the wiring of AMU (1RN) pin AB/9A to the first terminal block (Ref. ASM 23-42/01).
　
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