Bose 3-2-1GS Series II User Manual

91
Symptom Check for…
No power - Check input line cord and/or system cable connected properly.
- Check U2 and U17.
Console does not initialize
properly
- Check that the DVD eject pin is properly aligned with the inner
bezel plastics. The DVD eject pin loop should fit into the recess
in the inner bezel plastics. If this pin is installed with the loop
vertical instead of horizontal, it will not fit into the recess and
will cause the DVD drawer to not close properly, putting the
DVD drive and console electronics into a confused state.
- Ensure that the DVD drive ATAPI cable and power cable are
properly seated.
VFD does not display - Check that the ribbon cable from the VFD to J6500 is properly
seated.
- Check transistor Q6503. Replace if defective.
No remote response - Check transistor Q1 (270841-001) on the IR board. Replace if
defective.
- Check that the IR board ribbon cable is properly seated.
- Check that the ribbon cable from the button board to the main
PCB at J6700 is properly seated.
Analog audio input or
AM/FM audio garbled or
fades away after playing
for a while
- Check the software revision level. Update with the most recent
software version.
- Check the DAC IC U9200 DC offset level at the left and right
analog outputs.
Console keys won't
function
- Check that the ribbon cable from the button board to the main
PCB at J6700 is properly seated.
No optical audio - Check the optical SPDIF input connector J8000 for bent legs
on the bottom of the PCB.
Audio drop out at high
volume
- Check resistors R455 and R450 on the bass module
Amplifier/DSP PCB.
- 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.
Reduced AM tuner
performance
- Check the 20.00 MHz crystal Y9640.
- Ensure that the barrel of the AM connector is not touching the
enclosure's base, which is conductive near the AM connector.
Channel coupling at the
Zone input
- Ensure that there is a good ground connection between the
cable and J202.
Cannot read the bass
module's software version
- Check R4201.
Video has incorrect color
balance (chrominance)
- Check 27.00 MHz crystal Y7000 and ensure that is within
37ppm.
Analog signal coupling
during DVD/CD playback
- Check Q9100, Q9101 and Q9102.
Distorted video/audio - Check and replace digital video processor IC U7003.
No analog or AM/FM
audio, but digital audio is
normal.
- Check U4000.
Console Troubleshooting Tips

Bose 3-2-1GS Series II Specifications

General

Brand	Bose
Model	3-2-1GS Series II
Category	Home Theater System
Language	English