Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

DESCRIPTION

This circuit sends a signal to the stereo component amplifier to mute noise. As a reslut, the noise produced by changing the sound source ceases.
If there is an open in the circuit, noise can be heard from the speakers when changing the sound source.
If there is a short in the circuit, even though the stereo component amplifier is normal, no sound, or only an extremely small sound can be produced.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK STEREO COMPONENT AMPLIFIER (MUTE VOLTAGE)




(a) Measure the voltage of the amplifier.
Standard voltage:






OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.

2. CHECK WIRE HARNESS (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER)




(a) Disconnect the R6 receiver connector.
(b) Disconnect the S15 amplifier connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

3. REPLACE RADIO RECEIVER
(a) Replace the radio receiver with a normal one and check if it operates normally.
OK:
The radio receiver operates normally.
NG -- REPLACE STEREO COMPONENT AMPLIFIER
OK -- END