Section 3, Computer Aided Troubleshooting; Section 3 Contents - Bose Loewe Concertos Acoustimass 61247 Service Manual

Computer Aided Troubleshooting

Section 3, Computer Aided Troubleshooting .......................................................................... 42-64

Test Set-up Parameters and Equipment .......................................................................................43
Test Set-up Procedure ....................................................................................................................43
Troubleshooting Procedures ................................................................................................... 44-57
Figure 28. 25 Pin to 9 Pin Serial Data Cable...................................................................................44
Figure 29. DSP PCB Test Point Locations Layout Diagram, Solder Side ........................................44
Figure 30. Scope Photo of Boot Prompt at J5 Pin 11......................................................................47
Figure 31. CODEC to DSP, Digital Audio Signal Path .....................................................................56
Figure 32. Micro to DSPs ................................................................................................................56
Scope Photos ............................................................................................................................ 58-64
Figure 33. Codec (U100) Scope Photo, Un-mute Condition ...........................................................58
Figure 34. Codec (U100) Scope Photo, Mute Condition ................................................................. 59
Figure 35. Microcontroller (U202) Scope Photo, Power Up ............................................................60
Figure 36. SPDIF Signal at U100 pin 42 .........................................................................................61
Figure 37. Microcontroller 8 MHz clock at U202 pin 39 ...................................................................61
Figure 38. Codec 11.2896 MHz Clock ............................................................................................62
Figure 39. 40 MHz DSP clock .........................................................................................................62
Figure 40. 3.3V Switching Power Supply Signals............................................................................63
Figure 41. Power Up Condition at U202 Pin 25 ...............................................................................63
Figure 42. Transmit Frame Sync .....................................................................................................64
Figure 44. Audio Data .....................................................................................................................64
Figure 43. Serial Data Clock ...........................................................................................................64
Section 3

Section 3 Contents

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