Microphone Circuit Between Microphone and Radio Receiver

AUDIO AND VISUAL SYSTEM: Microphone Circuit between Microphone and Radio Receiver

Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

This circuit sends a microphone signal from the microphone to the radio receiver.
It also supplies power from the radio receiver to the microphone.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT RADIO RECEIVER





(a) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE RADIO RECEIVER
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - BODY GROUND)





(a) Disconnect the radio receiver connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (OVERHEAD J/B (MICROPHONE) - RADIO RECEIVER)





(a) Disconnect the overhead J/B (microphone) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE