Section 1, Bass Box Only Procedures; Section 1 Contents - Bose Loewe Concertos Acoustimass 61247 Service Manual

Bass Box Only Procedures
Section 1, Bass Box Only Procedures....................................................................................... 4-21
Test Set-up Parameters and Equipment .........................................................................................5
Bass Box Only Troubleshooting Procedures ..................................................................................5
Bass Box Only Test Procedures .................................................................................................. 6-7
Figure 1. Scope Photo of Boot Prompt at J5 Pin 11 ..........................................................................7
Amplifier PCB Hook-Up Procedures ......................................................................................... 8-11
Figure 2. Cable for Amplifier Output Connection at J701 .................................................................. 8
Figure 3. Output Wire Connection View at J701 ...............................................................................8
Figure 4. Input Wire Connection View at J700 .................................................................................. 9
Figure 5. Triac Jumping View on DSP PCB .....................................................................................10
Amplifier Test Procedures ..............................................................................................................12
DSP PCB Troubleshooting Procedures ................................................................................... 13-19
Figure 6. Codec to DSP, Digital Audio Signal Path ..........................................................................17
Figure 7. Micro to/from DSPs ..........................................................................................................17
Figure 8. DSP PCB Test Point Locations Layout Diagram, Solder Side ..........................................19
Scope Photos ............................................................................................................................ 20-21
Figure 9. Codec (U100) Scope Photo, Mute Condition ...................................................................20
Figure 10. Microcontroller (U202) Scope Photo, Power Up ............................................................21
Figure 11. Microcontroller 8 MHz clock at U202 pin 39 ...................................................................21
Section 1

Section 1 Contents

Click here to return to the main table of contents
4