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Bose 3-2-1GS Series II - User Manual

Bose 3-2-1GS Series II
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©2012 Bose Corporation
Reference Number 273029-SM Rev. 12
Service Manual
3
•
2
•
1, 3
•
2
•
1GS and 3
•
2
•
1GSX Series II
Home Entertainment Systems
(US and non-US Standard and Premium Versions)
Electronic Copy Only
3•2•1 Series II System
3
•2•1GS Series II System

Table of Contents

Questions and Answers

  • C
    Caroline GoldenSep 23, 2025
    Why does my Bose Home Theater System audio drop out at medium to high volume?
    • K
      kristenhooverSep 23, 2025
      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.
  • M
    Mark BarkerAug 25, 2025
    How to fix no power to console on Bose 3-2-1GS II Home Theater System?
    • J
      Justin MorganAug 25, 2025
      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).
  • A
    andrew90Aug 25, 2025
    Why is my Bose Home Theater System remote not responding?
    • J
      Juan CrawfordAug 26, 2025
      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.
  • Q
    qcollierAug 27, 2025
    How to troubleshoot no optical audio on Bose 3-2-1GS II Home Theater System?
    • E
      Eric BrewerAug 27, 2025
      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.
  • L
    Lindsey MosesAug 27, 2025
    Why is there no analog or AM/FM audio on my Bose 3-2-1GS II Home Theater System?
    • A
      austinrobertAug 27, 2025
      If your Bose Home Theater System has no analog or AM/FM audio, but digital audio is normal, check U4000.
  • S
    Sherry GonzalezSep 15, 2025
    Why is my Bose 3-2-1GS II video or audio distorted?
    • L
      Larry RodriguezSep 15, 2025
      If your Bose Home Theater System is producing distorted video or audio, check and replace the digital video processor IC U7003.
  • K
    kevin76Sep 12, 2025
    Why does my Bose 3-2-1GS II Home Theater System video have incorrect color balance?
    • N
      Nathan ParkerSep 13, 2025
      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.
  • E
    elliotttravisSep 14, 2025
    What causes analog signal coupling during DVD/CD playback on Bose 3-2-1GS II Home Theater System?
    • B
      Breanna BishopSep 14, 2025
      If you are experiencing analog signal coupling during DVD/CD playback on your Bose Home Theater System, check Q9100, Q9101 and Q9102.
  • W
    William OnealSep 5, 2025
    Why does my Bose 3-2-1GS II Home Theater System analog audio fade away?
    • J
      Julia TravisSep 5, 2025
      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.
  • G
    Gary BentleySep 2, 2025
    Why does my Bose Home Theater System audio crackle at high volume?
    • M
      Matthew PopeSep 2, 2025
      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.

Summary

Safety Information

Leakage Current Test Procedures

Procedures for testing leakage current.

Insulation Resistance Test Procedures

Procedures for testing insulation resistance.

ESDS Device Handling

Main Part List - Console Assembly

Main Part List - Console Assembly (continued)

Exploded view of the 3-2-1 II console assembly.

Main Part List - GSX Console Assembly

Main Part List - GSX Console Assembly (continued)

Exploded view of the 3-2-1GSX console assembly.

Main Part List - Bass Module (Before 4;27;09)

Main Part List - Bass Module (After 4;27;09)

Electrical Part List - Console Main PCB Resistors

Console Main PCB Resistors (continued)

Final resistors for the console main PCB.

Electrical Part List - Console Main PCB Capacitors

Console Main PCB Capacitors (continued)

Final capacitors for the console main PCB.

Console Main PCB Diodes and Transistors

Console Main PCB Transistors (continued)

More transistors for the console main PCB.

Console Main PCB Integrated Circuits

Electrical Part List - Console Tuner PCB Resistors

Console Tuner PCB Resistors (continued)

Additional resistors for the console tuner PCB.

Electrical Part List - Console Tuner PCB Capacitors

Console Tuner PCB Capacitors (continued)

More capacitors for the console tuner PCB.

Console Tuner PCB Diodes, Transistors, and ICs

Electrical Part List - Bass Module DSP;Amplifier PCB Resistors

Bass Module DSP;Amplifier PCB Resistors (continued)

More resistors for the bass module DSP/Amplifier PCB.

Electrical Part List - Bass Module DSP;Amplifier PCB Capacitors

Bass Module DSP;Amplifier PCB Capacitors (continued)

Final capacitors for the bass module DSP/Amplifier PCB.

Bass Module Transistors, ICs, and Miscellaneous

Electrical Part List - Bass Module Input;Output PCB Capacitors

Disassembly Procedures - Console

Console - Outer Bezel Removal

Steps to remove the front outer bezel.

Console - Top Cover Removal

Steps to remove the console's top cover.

Console - Inner Bezel Sub-assembly Removal

Steps to remove the inner bezel with PCBs.

Console - Tuner PCB Removal

Steps to remove the tuner PCB.

Console - DVD;CD Drive Removal

Steps to remove the DVD/CD drive.

Console - Hard Disc Drive Assembly Removal

Steps to remove the hard drive assembly (GSX only).

Console - Main PCB Assembly Removal

Steps to remove the main PCB assembly.

Bass Module Disassembly Procedures

Bass Module - Rear Enclosure Removal

Steps to remove the bass module's rear enclosure.

Bass Module - Main PCB Removal

Steps to remove the bass module's main PCB.

Satellite Array Procedures

Standard Satellite Array Procedures

Disassembly for standard arrays (grille/nameplate).

Gemstone Satellite Array Procedures

Disassembly for Gemstone arrays (grille/driver).

Test Procedures - Console

Console - Analog Audio Test

Test for analog audio input/output performance.

Console - Coaxial Digital Audio Test

Test for coaxial digital audio input/output.

Console - Optical Digital Audio Test

Test for optical digital audio input/output.

Console - Video Tests

Console - Internal DVD Video Test

Console - DVD Audio Test

Console - CD Playability Tests

Console Tuner Adjustments and Measurements

AM Adjustments

AM RF Tracking

FM Adjustments

AM Sensitivity

FM Stereo Separation

AM Alignments

AM Stop Level

FM IF Centering Adjustment

FM Distortion Measurement;Adjustment

FM Sensitivity

FM Stereo Separation

FM Stop Level

FM Stereo & Force Mono Threshold

FM Signal to Noise Ratio

Hard Drive Self Test (GSX)

User Interface Tests

Bass Module Procedures

Power Up Test

Console Test Setup Diagram

Bass Module Test Setup Diagram

Computer Setup Procedure

Computer Setup Procedure (continued)

TAP Cable Construction

ETAP Connection and Handling

Setting up Console for ETAP Mode

Bass Module Test Cable Construction

Console Test Cable Construction

Putting the Console into TAP Mode

Console TAP Commands

Console TAP Commands (continued)

Changing the Region Code

Setting Console Variant (CV)

DVD Lock Options

Setting a Password and Restriction Level

DVD Lock Bypass

IC Diagrams

Digital Signal Processor (DSP) IC

Console Troubleshooting Tips

Bass Module Troubleshooting Tips

Bose 3-2-1GS Series II Specifications

General IconGeneral
Audio Channels2.1
TypeHome Theater System
Number of Speakers2
SubwooferYes
Remote ControlYes
Media PlaybackDVD, CD

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