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. Because of that, 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 functioning, no sound, or only an extremely faint sound, can be heard.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT STEREO COMPONENT AMPLIFIER





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






NG -- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER)





(a) Disconnect the the radio receiver connector and the stereo component amplifier connector.
(b) Measure the resistance according to the values in the table below.
Standard resistance:






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

3. REPLACE STEREO COMPONENT AMPLIFIER
(a) Replace the stereo component amplifier and check that it operates normally.
OK:
The audio system operates normally.
OK -- END

NG -- REPLACE RADIO RECEIVER