Bose LS 12,25,30 AMP II free download

File name Digital AM Powered.pdf

Troubleshooting Guide Overview This troubleshooting guide is divided into three sections. The section that you use will be determined by the items available to you for use in troubleshooting. Section 1 allows for limited troubleshooting due to limited availability of items. Section 3 is the most complete troubleshooting section. Section 1: Bass Box Only Procedures is to be used if you have a bass module to troubleshoot, but no head unit or PC to turn the bass module on. It will take you through a troubleshooting process which will allow you to power up the amplifier PCB by itself, as well as some troubleshooting procedures for the Digital Signal Processor PCB, should it be at fault. Section 2: Bass Box with a Head Unit Procedures is to be used if you have a bass module and a head unit, but no PC. In this section you will be able to connect an audio signal to the head unit and turn the bass module on. This will allow you to signal trace and troubleshoot the amplifier PCB and the Digital Signal Processor PCB. Section 3: Computer Aided Troubleshooting Procedures is to be used if you have a PC that can be used to communicate with the Digital Signal Processor PCB of the bass module, and is the preferred method of troubleshooting. In this section you will be able to determine the EQ curve of the module under test as well as put the module into different test modes for easier troubleshooting. There is an Appendix at the back of this guide containing information such as simplified schematic diagrams, block diagrams, frequency response curves, tables, and computer setup information. See the table of contents for a complete listing. 1 Table of Contents Troubleshooting Guide Overview ...1 Table of Contents ... 2-3 Section 1, Bass Box Only Procedures... 4-21 Section 1 Contents ...4 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. O

File name Digital DC.pdf

File name Digital.pdf

Contents Warranty Period... 1 Safety Information ... 2 Electrostatic Discharge Sensitive (ESDS) Device Handling ... 3 Specifications ... 4 Theory of Operation ... 5-17 Figure 1. DSP PCB Block Diagram ... 17 Figure 2. DSP Signal Flow ... 17 Disassembly/Assembly Procedures ... 18-22 Figure 3. Top Cover Screw Location ... 18 Figure 4. Cover Latch Rotated Out ... 18 Figure 5. Cover Latch Rotated In ... 18 Figure 6. Base Plate Tabs ... 18 Figure 7. Amplifier Assembly ... 20 Figure 8. Woofer Harness Hookup ... 21 Test Set-up Parameters and Equipment ... 23 Test Procedures ... 24-25 Part List Notes ... 26 Main Parts List ... 27 Figure 9. Bass Box and Module Exploded Views ... 28 Electrical Part List ... 29-41 Satellite Part List ... 42 Figure 10. LS12/25 Satellite Assembly ...