Microphone Circuit Between Microphone and Radio and Navigation Assembly

NAVIGATION: NAVIGATION SYSTEM: Microphone Circuit between Microphone and Radio and Navigation Assembly

Microphone Circuit between Microphone and Radio and Navigation Assembly

DESCRIPTION

This circuit sends a microphone signal from the microphone to the radio and navigation assembly.
It also supplies power from the radio and navigation assembly to the microphone.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT RADIO AND NAVIGATION ASSEMBLY




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





NG -- REPLACE RADIO AND NAVIGATION ASSEMBLY
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR




(a) Disconnect the radio and navigation assembly connector R26.
(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 (MICROPHONE - RADIO AND NAVIGATION ASSEMBLY)




(a) Disconnect the microphone connector T18 and radio and navigation assembly connector R26.
(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