Bose 321 and 321 gs series troubleshooting 270000 tg1
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1 CONTENTS 3-21 and 321 GS Home Entertainment System Differences ...................................................... 2 Software Update Information .......................................................................................................... 2 Safety Information ............................................................................................................................ 3 Electrostatic Discharge Sensitive (ESDS) Device Handling ......................................................... 3 Theory of Operation ...................................................................................................................4-21 Figure 1. 3-2-1 Console Block Diagram ..........................................................................................22 Figure 2. 3-21 Console Test Setup Diagram ..................................................................................23 Figure 3. 321 Bass Module Test Setup Diagram ...........................................................................24 Figure 4. 321 and 321 GS Satellite Speaker Wiring Diagram .....................................................24 Test Procedures ........................................................................................................................25-35 Figure 5. Laser Voltage Test Points .................................................................................................27 Figure 6. Laser Current Rating Label ..............................................................................................27 Figure 7. AM Loop Antenna Test Setup ...........................................................................................28 Console Main PCB troubleshooting ............................................................................................. 36 Test Cables ...................................................................................................................................... 36 Figure 8. DVD Mechanism Rear Panel ...........................................................................................36 Figure 9. Bass Module Test Cable Wiring ........................................................................................37 Bass Module Test cable ............................................................................................................ 37-38 321 System Date of Manufacture Information ........................................................................... 38 Checking Console Firmware Revisions ........................................................................................ 39 Computer Setup Procedure ..................................................................................................... 40-41 TAP Commands ........................................................................................................................43-51 Tuner S-Meter Hexidecimal to Decimal to Voltage Conversion Charts: ...............................52-54 Console Main PCB Video Troubleshooting and Waveforms.................................................55-61 Bass Module Troubleshooting Information .................................................................................. 62 Changing the 321 Console Region Code .............................................................................62-63 Table 1. Region Code Tap Commands and Responses ..................................................................63 Parental Control Information ......................................................................................................... 64 Table 2. 321 Console DVD Parental Control Rating Codes ..........................................................64 Console Display Test ...................................................................................................................... 64 Integrated Circuit Diagrams ..................................................................................................... 65-79
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2 CAUTION: The Bose 321 and 321 GS Home Entertainment Systems contain no user-serviceable parts. To prevent warranty infractions, refer servicing to warranty service stations or factory service. PROPRIETARY INFORMATION THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF BOSE CORPORATION WHICH IS BEING FURNISHED ONLY FOR THE PURPOSE OF SERVICING THE IDENTIFIED BOSE PRODUCT BY AN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF THE BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR USED FOR ANY OTHER PURPOSE. The firmware located in the main PCB and display PCB's microprocessors can be updated by means of an update CD. These update CDs are available from Bose ® Product and Technical Support at 800-233-4408 (Bose service centers only) or 800-367-4008 (Bose system owners) and are automatically sent out to customers who have purchased the 3-2-1 system, filled out and returned the software update card that came with their system literature. Service centers can also download an ISO image of the latest firmware update file from the Service web site at http://serviceops.bose.com and burn it onto a CD for use as an update disc. Once you have the CD, simply power up the console, press the stop/eject button on the con- sole, place the update CD into the drawer and close it and the update process will begin. When the process is complete you may remove the update CD. Check to verify that both the display PCB firmware and the main PCB firmware have updated properly. You can do this by using the TAP commands or by a series of button presses on the console front panel. Both of these methods are outlined in the Appendix.Software Update Information 321 and 321 GS Home Entertainment System Differences The 321 and 321 GS (Gemstone) home entertainment systems share the same basic com- ponents. The bass module and bass module cable are identical. The console uses the same electronic parts and most of the same chassis parts. The differences in the console are the console firmware and the color of the silver front bezel and DVD drawer bezel. The arrays used on the two systems are different. The standard 321 system uses the larger 60mm driver arrays, and are only available in graphite. The 321 GS arrays utilize the smaller 50mm Jewel Cube ® driver. These arrays are available in graphite and silver.