C. Do the test given in Para. 3.

 TASK 23-42-00-810-804

 Failure of the Mechanic Call Horn
 1. Possible Causes
_______________
 - HORN-MECH CALL (15WC)

 - RELAY-HORN SUPPLY (4WC)

 - P/B SW-CALLS/MECH (1WC)

 - DIODE MODULE (1160VD)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 23-42-00-710-001 Operational Test of the Mechanic Call
 AMM 23-42-21-000-001 Removal of the Mechanic Call Horn (15WC)
 AMM 23-42-21-400-001 Installation of the Mechanic Call Horn (15WC)
 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 mechanical call horn does not operate:
 - replace the HORN-MECH CALL (15WC) (Ref. AMM TASK 23-42-21-000-001) and (Ref. AMM TASK 23-42-21-400-001).
 (1) If the fault continues:

 - replace the RELAY-HORN SUPPLY (4WC).

 (2) If the fault continues:

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

 (3) If the fault continues:

 - do a check of DIODE MODULE (1160VD) pins 4 and 19 (Ref. ASM 23-42/01).
 (a) If the diode is defective:
 - replace the DIODE MODULE (1160VD)
 「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 205
 Feb 01/98 CES (b) If the diode is not defective:

 - do a check and repair the wiring of these components: . horn (15WC) . relay (4WC) . diode module (1160VD) . pushbutton switch (1WC) (Ref. ASM 23-42/01).
 B. Do the test given in Para. 3.

 TASK 23-42-00-810-805 Failure of the Aural Warning
 1. Possible Causes
_______________
 - DIODE MODULE (1801VD)

 - wiring of the diode module (1801VD) to the first module

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 23-42-00-710-001 Operational Test of the Mechanic Call 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 buzzer in the aural warning loud
 speakers does not operate:

 - do a check of diode module (1801VD) pins 1 and 16 (Ref. ASM 23-42/01).
 (1) If the diode is defective:

 - replace the DIODE MODULE (1801VD).

 (2) If the diode is not defective:

 - do a check and repair the wiring of the diode module (1801VD) to the first module (Ref. ASM 23-42/01).
 B. Do the test given in Para. 3.

 TASK 23-42-00-810-806
 Failure of the Cockpit Call

 1. Possible Causes
_______________
 - wiring

 - C/B-EIS/HORN/SPLY (2WC)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 23-42-00-710-001 Operational Test of the Mechanic Call
 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. Table of the circuit breakers used in this procedure:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU EIS/HORN/SPLY 2WC P09
 B. If during the operational test the indicator light and the horn of the cockpit call do not operate:
　
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