Section 2, Bass Module With Head Unit Procedures; Section 2 Contents - Bose Loewe Concertos Acoustimass 61247 Service Manual

Bass Module with Head Unit Procedures
Section 2, Bass Module with Head Unit Procedures .............................................................. 22-41
Normal System Operation Description .........................................................................................23
Test Setup Procedures ...................................................................................................................24
Connection of Bass Module Using a CD-5/CD-20 Music Center .................................................24
Bass Box Troubleshooting Procedures ................................................................................... 25-33
Figure 12. Scope Photo of Boot Prompt at J5 Pin 11......................................................................26
Figure 13. Codec to DSP, Digital Audio Signal Path ........................................................................32
Figure 14. Micro to/from DSPs ........................................................................................................32
DSP PCB Troubleshooting ..............................................................................................................34
Figure 15. DSP PCB Test Point Locations Layout Diagram, Solder Side ........................................34
Scope Photos ............................................................................................................................ 35-41
Figure 16. Codec (U100) Scope Photo, Un-mute Condition ...........................................................35
Figure 17. Codec (U100) Scope Photo, Mute Condition ................................................................. 36
Figure 18. Microcontroller (U202) Scope Photo, Power Up ............................................................37
Figure 19. SPDIF Signal at U100 pin 42 .........................................................................................38
Figure 20. Microcontroller 8 MHz clock at U202 pin 39 ...................................................................38
Figure 21. Codec 11.2896 MHz Clock ............................................................................................39
Figure 22. 40 MHz DSP clock .........................................................................................................39
Figure 23. 3.3V Switching Power Supply Signals............................................................................40
Figure 24. Power Up Condition at U202 Pin 25 ...............................................................................40
Figure 25. Transmit Frame Sync .....................................................................................................41
Figure 26. Serial Data Clock ...........................................................................................................41
Figure 27. Audio Data .....................................................................................................................41
Section 2

Section 2 Contents

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