Microphone Circuit Between Microphone and Navigation Receiver Assembly

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

Microphone Circuit between Microphone and Navigation Receiver Assembly

DESCRIPTION

This circuit sends a microphone signal from the overhead junction block (microphone) to the navigation receiver assembly.
It also supplies power from the navigation receiver assembly to the overhead junction block (microphone).

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (OVERHEAD JUNCTION BLOCK - NAVIGATION RECEIVER ASSEMBLY)




(a) Disconnect microphone connector Q11 and navigation receiver assembly connector E4.
(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.
2. INSPECT NAVIGATION RECEIVER ASSEMBLY




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






NG -- REPLACE NAVIGATION RECEIVER ASSEMBLY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY)




(a) 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