AUDIO AND VISUAL SYSTEM Sound Signal Circuit between Radio Receiver and Stereo Jack Adapter

DESCRIPTION

• The No. 1 stereo jack adapter assembly sends the sound signal from an external device to the radio receiver assembly via this circuit.

  The sound signal that has been sent is amplified by the stereo component amplifier assembly and then is sent to the speakers.

  If there is an open or short in the circuit, sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assembly, radio receiver assembly or speakers.

WIRING DIAGRAM

*a	(Shielded)
*b	No. 1 Stereo Jack Adapter Assembly
*c	Radio Receiver Assembly

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - NO. 1 STEREO JACK ADAPTER ASSEMBLY)

   
   

   1. Disconnect the H179 radio receiver assembly connector.

   2. Disconnect the H174 No. 1 stereo jack adapter assembly connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition H179-25 (ADPG) - H174-1 (ADPG) Always Below 1 Ω H179-11 (AGND) - H174-7 (AGND) Always Below 1 Ω H179-26 (VAR+) - H174-2 (VAR+) Always Below 1 Ω H179-28 (VAL+) - H174-3 (VAL+) Always Below 1 Ω H179-27 (VA-) - H174-4 (VA-) Always Below 1 Ω H179-25 (ADPG) - Body ground Always 10 kΩ or higher H179-11 (AGND) - Body ground Always 10 kΩ or higher H179-26 (VAR+) - Body ground Always 10 kΩ or higher H179-28 (VAL+) - Body ground Always 10 kΩ or higher H179-27 (VA-) - Body ground Always 10 kΩ or higher

   
   

   OK

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR