1
CAUTION: THE BOSE
®
MODEL 20 (CD-20) MUSIC CENTER CONTAINS NO USER-SER-
VICEABLE PARTS. TO PREVENT WARRANTY INFRACTIONS, REFER SERVICE TO
WARRANTY SERVICE STATIONS OR FACTORY SERVICE.
Contents
Safety Information............................................................................................................................ 2
Electrostatic Discharge Sensitive (ESDS) Device Handling ........................................................ 3
CD-20 Manual Revision Overview ..................................................................................................3
Specifications ................................................................................................................................ 4-7
Theory of Operation .................................................................................................................... 8-13
Figure 1. CD-20 Block Diagram ..................................................................................................... 13
Disassembly/Assembly Procedures ....................................................................................... 14-15
Figure 2. Disassembly/Assembly View .......................................................................................... 16
Figure 3. Exploded View of Door ................................................................................................... 17
RC-20 Remote Disassembly/Assembly........................................................................................ 18
Figure 4. RC-20 Disassembly/Assembly View ............................................................................... 18
CD Mechanism Disassembly Procedures............................................................................... 19-23
Test Procedures ........................................................................................................................ 24-28
Figure 5. Tuner Alignment Locations.............................................................................................. 28
Remote Control Alignment............................................................................................................ 29
Figure 6. RC-20 Tuning Locations ................................................................................................. 29
Alignment Procedures.............................................................................................................. 30-31
Part List Notes................................................................................................................................ 32
Main Part List.................................................................................................................................. 33
Figure 7. CD-20 Exploded View ..................................................................................................... 34
CD Mechanism Part List ................................................................................................................ 35
Figure 8. CD Mechanism Exploded View....................................................................................... 36
Electrical Part List ..................................................................................................................... 37-48
Figure 9. RC-20 Remote Exploded View ....................................................................................... 48
RC-20 Remote Part List ................................................................................................................. 49
RC-20 Remote Electrical Part List ........................................................................................... 49-50
Packaging Part List ........................................................................................................................ 51
Figure 10. Packaging Exploded View ............................................................................................ 51
Accessory Part List........................................................................................................................ 52
Figure 11. Accessory Packaging ................................................................................................... 52
IC Block Diagrams and Pinouts............................................................................................... 53-55
CD Mechanism IC Block Diagrams.......................................................................................... 56-59
CD Mechanism IC Pin Configuration Tables .......................................................................... 60-66
CD Mechanism IC and Transistor Voltage Tables .................................................................. 67-68
CD Mechanism Troubleshooting.............................................................................................69-86
CD-20 Troubleshooting Waveforms........................................................................................87-91
Last updated 9/20/00
Includes S4, S5, S6, S8, and S9
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