Why does my Bose Home Theater System audio drop out at medium to high volume?
If the audio regularly drops out at medium to high volume on your Bose Home Theater System, and may affect bass, left array or right array independently, check the seating of amplifiers (U150, U250, U350) for proper thermal coupling to the heatsink.
How to fix no power to console on Bose 3-2-1GS II Home Theater System?
If your Bose Home Theater System console has no power, check the seating of cable 271561-190 between the DSP and I/O board. Also, check F1 on the Input/Output PCB and the console cable (269997-001).
Why is my Bose Home Theater System remote not responding?
If your Bose Home Theater System is not responding to the remote, check transistor Q1 (270841-001) on the IR board and replace it if defective. Ensure that the IR board ribbon cable is properly seated. Also, check that the ribbon cable from the button board to the main PCB at J6700 is properly seated.
How to troubleshoot no optical audio on Bose 3-2-1GS II Home Theater System?
If there is no optical audio on your Bose Home Theater System, check the optical SPDIF input connector J8000 for bent legs on the bottom of the PCB.
Why is there no analog or AM/FM audio on my Bose 3-2-1GS II Home Theater System?
If your Bose Home Theater System has no analog or AM/FM audio, but digital audio is normal, check U4000.
Why is my Bose 3-2-1GS II video or audio distorted?
If your Bose Home Theater System is producing distorted video or audio, check and replace the digital video processor IC U7003.
Why does my Bose 3-2-1GS II Home Theater System video have incorrect color balance?
If the video on your Bose Home Theater System has an incorrect color balance (chrominance), check the 27.00 MHz crystal Y7000 and ensure that it is within 37ppm.
What causes analog signal coupling during DVD/CD playback on Bose 3-2-1GS II Home Theater System?
If you are experiencing analog signal coupling during DVD/CD playback on your Bose Home Theater System, check Q9100, Q9101 and Q9102.
Why does my Bose 3-2-1GS II Home Theater System analog audio fade away?
If you experience analog audio input or AM/FM audio that is garbled or fades away after playing for a while on your Bose Home Theater System, check the software revision level and update to the most recent version. Also, check the DAC IC U9200 DC offset level at the left and right analog outputs.
Why does my Bose Home Theater System audio crackle at high volume?
If your Bose Home Theater System exhibits audio crackling or breakup on program peaks at high volume, check all cables and connectors in the ground path to the console, including J150 on the DSP, cable 271561-190, and J3 & J7 on the I/O. Replace any corroded contacts as necessary. Also, check the PCB soldering to J150 on the DSP and re-solder if needed.
General| Audio Channels | 2.1 |
|---|---|
| Type | Home Theater System |
| Number of Speakers | 2 |
| Subwoofer | Yes |
| Remote Control | Yes |
| Media Playback | DVD, CD |
Procedures for testing leakage current.
Procedures for testing insulation resistance.
Exploded view of the 3-2-1 II console assembly.
Exploded view of the 3-2-1GSX console assembly.
Final resistors for the console main PCB.
Final capacitors for the console main PCB.
More transistors for the console main PCB.
Additional resistors for the console tuner PCB.
More capacitors for the console tuner PCB.
More resistors for the bass module DSP/Amplifier PCB.
Final capacitors for the bass module DSP/Amplifier PCB.
Steps to remove the front outer bezel.
Steps to remove the console's top cover.
Steps to remove the inner bezel with PCBs.
Steps to remove the tuner PCB.
Steps to remove the DVD/CD drive.
Steps to remove the hard drive assembly (GSX only).
Steps to remove the main PCB assembly.
Steps to remove the bass module's rear enclosure.
Steps to remove the bass module's main PCB.
Disassembly for standard arrays (grille/nameplate).
Disassembly for Gemstone arrays (grille/driver).
Test for analog audio input/output performance.
Test for coaxial digital audio input/output.
Test for optical digital audio input/output.
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