Test F: Poor Quality/Distorted/No Sound From All Speakers

PINPOINT TEST F: POOR QUALITY/DISTORTED/NO SOUND FROM ALL SPEAKERS

F1:

F1-F3:

Normal Operation
The audio unit directs audio signals to the speakers through separate positive and negative circuits for each of the 4 audio channels: LH front, RH front, LH rear, and RH rear. When the key is put in START, voltage is sent to the audio unit through circuit 1772 (VT), causing the audio unit to mute all speakers to prevent popping.

Possible Causes
- Circuit 1772 (VT) short to voltage
- Audio unit