Mute Signal Circuit Between Radio Receiver And Television Display Assembly

AUDIO AND VISUAL SYSTEM: Mute Signal Circuit between Radio Receiver and Television Display Assembly

Mute Signal Circuit between Radio Receiver and Television Display Assembly

DESCRIPTION

The radio receiver controls the volume according to the MUTE signal from the television display assembly.
The MUTE signal is sent to reduce noise and a popping sound generated when switching the mode, etc.
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 radio receiver is normal, no sound, or only an extremely small sound, can be produced.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT TELEVISION DISPLAY ASSEMBLY





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






OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - TELEVISION DISPLAY)





(a) Disconnect the radio receiver connector R3 and television display assembly connector R14.
(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. INSPECT TELEVISION DISPLAY ASSEMBLY (OUTPUT SIGNAL)





(a) Reconnect the television display assembly connector R14.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE TELEVISION DISPLAY ASSEMBLY
OK -- REPLACE RADIO RECEIVER