Test D: Poor Quality/Distorted/No Sound From All Speakers - THX(R) Audio System
PINPOINT TEST D: POOR QUALITY/DISTORTED/NO SOUND FROM ALL SPEAKERS - THX(R) AUDIO SYSTEMNormal Operation
The audio control module (ACM) enables the audio digital signal processing (DSP) module through circuit CME27 (YE/VT). The DSP module receives voltage through circuits SBB20 (GN/RD) and SBB21 (GY/RD), and ground through circuit GD148 (BK/YE).
Left and right channel audio signals are sent from the ACM to the DSP module through circuits VME17 (GN), RME17 (GY), VME18 (VT), and RME18 (YE). If there is a fault on one of these circuits, the audio quality will be reduced approximately 25% for all speakers.
The enable/clip circuit CME27 (YE/VT) carries out 2 functions: to turn the DSP module on, and to monitor an overload condition to the DSP module. In the event of an overload, the ACM clips the audio output signal to the DSP module (heard as distortion).
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- DSP module
- ACM
D1-D3:
D3-D5:
D6-D9:
