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CONTENTS
Safety Information ............................................................................................................................. 2
Warranty ............................................................................................................................................. 2
Product Description .......................................................................................................................... 3
Accessories....................................................................................................................................... 3
Specifications ................................................................................................................................ 4-7
Electrostatic Discharge Sensitive (ESDS) Device Handling ......................................................... 8
Part List Notes ................................................................................................................................... 8
Frequently Ordered Items ................................................................................................................ 9
Packaging Part List, 3-21 Series II Home Entertainment System (see Figure 1) ..................... 10
Figure 1. 3-21 Series II Home Entertainment System Packaging View ..........................................11
Packaging Part List, 321 Series II Accessory Kit (see Figure 2) .............................................. 12
Figure 2. Accessory Kit Exploded View .............................................................................................12
Main Part List, 321 Series II Console Assembly (see Figure 3) ................................................ 13
Figure 3. 321 Series II Console Exploded View .............................................................................14
Main Part List, Bass Module (see Figure 4) .................................................................................. 15
Figure 4. Bass Module Packaging View ...........................................................................................15
Main Part List, Standard 321 Array Assembly (see Figure 5) ................................................... 16
Figure 5. Standard 321 Array Assembly Exploded View ................................................................16
Main Part List, 321 GS Array Assembly (see Figure 6) ............................................................. 17
Figure 6. 321 GS Array Assembly Exploded View ..........................................................................17
Electrical Part Lists ................................................................................................................... 18-41
Console Main PCB Assembly .................................................................................................. 18-29
Console Tuner PCB Assembly ................................................................................................. 30-33
Bass Module DSP/Amplifier PCB Assembly ........................................................................... 34-40
Bass Module Input/Output PCB Assembly ................................................................................... 41
Disassembly Procedures .........................................................................................................42-47
Console Procedures ................................................................................................................. 42-45
Bass Module Procedures .........................................................................................................45-46
Standard Satellite Array Procedures .............................................................................................47
Gemstone
TM Satellite Array Procedures ........................................................................................ 47
Test Procedures ........................................................................................................................ 48-52
Figure 7. Console Main PCB Layer 1 Topside Etch Layout Diagram ...............................................53
Figure 8. Console Main PCB Layer 2 Ground Plane Layout Diagram ..............................................54
Figure 9. Console Main PCB Layer 3 Power Plane Layout Diagram ................................................55
Figure 10. Console Main PCB Layer 4 Bottom Etch Layout Diagram ..............................................56
Figure 11. Console Tuner PCB Topside Etch Layout Diagram .........................................................57
Figure 12. Console Tuner PCB Bottom Side Etch Layout Diagram ..................................................58
Figure 13. Bass Module DSP/Amplifier PCB Topside Etch Layout Diagram ....................................59
Figure 14. Bass Module DSP/Amplifier PCB Bottom Side Etch Layout Diagram .............................60
Figure 15. Bass Module Input/Output PCB Topside Etch Layout Diagram .......................................61
Figure 16. Bass Module Input/Output PCB Bottom Side Etch Layout Diagram ...............................61
Appendix.................................................................................................................................... 62-66
Obtaining System Information from the Media Center Display .................................................. 62
DVD Lock options ..................................................................................................................... 63-64
Setting a password and restriction level ...................................................................................... 63
DVD Lock Bypass ............................................................................................................................ 64
321 Series II System Date of Manufacture Information ............................................................... 64
Glossary of Terms ........................................................................................................................... 65
Service Manual Revision History ................................................................................................... 66
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SAFETY INFORMATION
1. Parts that have special safety characteristics are identified by the symbol on schematics
or by special notes on the parts list. Use only replacement parts that have critical characteristics
recommended by the manufacturer.
2. Make leakage current or resistance measurements to determine that exposed parts are
acceptably insulated from the supply circuit before returning the unit to the customer.
Use the following checks to perform these measurements:
A. Leakage Current Hot Check-With the unit completely reassembled, plug the AC line cord
directly into a 120V AC outlet. (Do not use an isolation transformer during this test.) Use a
leakage current tester or a metering system that complies with American National Standards
Institute (ANSI) C101.1 "Leakage Current for Appliances" and Underwriters Laboratories (UL)
UL6500 / UL60065 / IEC 60065 paragraph 9.1.1. With the unit AC switch first in the ON position
and then in OFF position, measure from a known earth ground (metal waterpipe, conduit, etc.)
to all exposed metal parts of the unit (antennas, handle bracket, metal cabinet, screwheads,
metallic overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical
return path to the chassis. Any current measured must not exceed 0.5 milliamp. Reverse the
unit power cord plug in the outlet and repeat test. ANY MEASUREMENTS NOT WITHIN THE
LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE
ELIMINATED BEFORE RETURNING THE UNIT TO THE CUSTOMER.
B. Insulation Resistance Test Cold Check-(1) Unplug the power supply and connect a jumper
wire between the two prongs of the plug. (2) Turn on the power switch of the unit. (3) Measure
the resistance with an ohmmeter between the jumpered AC plug and each exposed metallic
cabinet part on the unit. When testing 3 wire products, the resistance measured to the product
enclosure should be between 2 and infinite MOhms. Also, the resistance measured to exposed
input/output connectors should be between 4 and infinite MOhms. When testing 2 wire prod-
ucts, the resistance measured to exposed input/output connectors should be between 4 and
infinite MOhms. If it is not within the limits specified, there is the possibility of a shock hazard,
and the unit must be repaired and rechecked before it is returned to the customer.
CAUTION: The Bose ® 3-21 Series II Home Entertainment System
contains 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 Bose ® 321 and 321GS Series II Home Entertainment Systems are covered by a limited
1-year transferable warranty.
WARRANTY
