What causes VFD not to display on Bose Home Theater System?
If the VFD on your Bose Home Theater System does not display, check that the ribbon cable from the VFD to J6500 is properly seated. Also, check transistor Q6503 and replace it if it is defective.
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 won't the console keys function on my Bose 3-2-1GS II?
If the console keys on your Bose Home Theater System won't function, check that the ribbon cable from the button board to the main PCB at J6700 is properly seated.
Why does my Bose 3-2-1GS II audio drop out at high volume?
If the audio drops out at high volume on your Bose Home Theater System, check resistors R455 and R450 on the bass module Amplifier/DSP PCB. Also, ensure that there is no hot-melt or other debris on the thermal tab of the power amplifier ICs U150, U250 and U350 located on the bass module Amplifier/DSP PCB.
Why is the AM tuner performance reduced on my Bose 3-2-1GS II Home Theater System?
If your Bose Home Theater System has reduced AM tuner performance, check the 20.00 MHz crystal Y9640. Also, ensure that the barrel of the AM connector is not touching the enclosure's base, which is conductive near the AM connector.
What causes channel coupling at the Zone input on Bose 3-2-1GS II?
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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