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.
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.
What to do if my Bose 3-2-1GS II has no power?
If your Bose Home Theater System has no power to the system, check the transformer primary and secondary connectors. Inspect the line fuse on the I/O board and replace it if necessary. Check the power switch or dual voltage switch, if your unit has one. Also, check the resistance of the transformer primary; if it's open, the thermal fuse has likely opened, requiring transformer replacement.
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.
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 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.
What to do if F1 on the Input/Output PCB blows on Bose 3-2-1GS II Home Theater System?
If the F1 fuse on the Input/Output PCB of your Bose Home Theater System blows, and the console is not attached, inspect the console cable for damage that may be causing shorts. If the fuse blows when the console is plugged in, check the console itself for shorts.
Why is my Bose 3-2-1GS II Home Theater System console not initializing properly?
If your Bose Home Theater System console does not initialize properly, ensure the DVD eject pin is correctly aligned with the inner bezel plastics. Also, check that the DVD drive ATAPI cable and power cable are properly seated.
How to troubleshoot no power on Bose 3-2-1GS II?
If your Bose Home Theater System has no power, verify that the input line cord and the system cable are properly connected. Also, check U2 and U17.
What to do if there is no audio on any channel of Bose 3-2-1GS II?
If there is no audio on any channel of your Bose Home Theater System, check Vraw. If it is above 18 VDC (probably 25~30V), replace Q4 FET (274550-002).
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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