Bose packlite bose model a1 amplifier service manual rev2
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1 CONTENTS Safety Information ............................................................................................................................. 2 Warranty............................................................................................................................................. 2 Product Description .......................................................................................................................... 3 Carton Contents ................................................................................................................................ 3 Amplifier Rear Panel Connections and Controls ........................................................................... 4 Top Panel Indicators ......................................................................................................................... 4 Setting Up a Single A1 Amplifier ..................................................................................................... 5 Using Multiple A1 Amplifiers ............................................................................................................ 6 Using the A1 in other applications .................................................................................................. 7 Setting up the A1 for use with other systems: ............................................................................... 7 Specifications .................................................................................................................................... 8 Production Notes .............................................................................................................................. 9 Electrostatic Discharge Sensitive (ESDS) Device Handling ......................................................... 9 Part List Notes ................................................................................................................................... 9 Packaging Part List, PackLite TM A1 Amplifier Assembly (see Figure 1) ..................................... 10 Figure 1. PackLite A1 Amplifier Assembly Packaging View ............................................................10 Main Part List, PackLite A1 Amplifier Assembly (see Figure 2) .................................................. 11 Figure 2. PackLite A1 Amplifier Exploded View ..............................................................................12 Electrical Part Lists ................................................................................................................... 13-29 Power Supply / Amplifier PCB Assembly ................................................................................ 13-22 Input / Limiter PCB Assembly .................................................................................................. 23-28 Signal LED PCB Assembly ............................................................................................................. 29 Power / Fault LED PCB Assembly .................................................................................................29 Disassembly Procedures .........................................................................................................30-33 Test Procedures ........................................................................................................................ 33-34 Figure 3. Amplifier/SMPS PCB (Non-RoHS) Topside Etch Layout .................................................35 Figure 4. Amplifier/SMPS PCB (Non-RoHS) Internal Etch Layer 1 Layout ....................................35 Figure 5. Amplifier/SMPS PCB (Non-RoHS) Internal Etch Layer 2 Layout ....................................36 Figure 6. Amplifier/SMPS PCB (Non-RoHS) Bottom Etch Layout ..................................................36 Figure 7. Amplifier/SMPS PCB (RoHS) Topside Etch Layout .........................................................37 Figure 8. Amplifier/SMPS PCB (RoHS) Internal Etch Layer 1 Layout ............................................37 Figure 9. Amplifier/SMPS PCB (RoHS) Internal Etch Layer 2 Layout ............................................38 Figure 10. Amplifier/SMPS PCB (RoHS) Bottom Etch Layout ........................................................38 Figure 11. Input/Limiter PCB (Non-RoHS) Top Side Etch Layout ...................................................39 Figure 12. Input/Limiter PCB (Non-RoHS) Bottom Side Etch Layout .............................................39 Figure 13. Input/Limiter PCB (RoHS) Top Side Etch Layout ..........................................................40 Figure 14. Input/Limiter PCB (RoHS) Bottom Side Etch Layout .....................................................40 Figure 15. Power/Fault LED PCB Etch Layout ...............................................................................41 Figure 16. Signal/Overload LED PCB Etch Layout ........................................................................41 Test Cable Wiring Diagrams ........................................................................................................... 41 Troubleshooting .............................................................................................................................. 42 Theory of Operation, PackLite Model A1 Amplifier ................................................................ 43-50 Integrated Circuit Diagrams ..................................................................................................... 51-53 Service Manual Revision History ................................................................................................... 54
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2 SAFETY INFORMATION 1. Parts that have special safety characteristics are identified by the symbol on schematics or by special notes on the parts list. Use only replacement parts that have critical characteristics recommended by the manufacturer. 2. Make leakage current or resistance measurements to determine that exposed parts are acceptably insulated from the supply circuit before returning the unit to the customer. Use the following checks to perform these measurements: A. Leakage Current Hot Check-With the unit completely reassembled, plug the AC line cord directly into a 120V AC outlet. (Do not use an isolation transformer during this test.) Use a leakage current tester or a metering system that complies with American National Standards Institute (ANSI) C101.1 "Leakage Current for Appliances" and Underwriters Laboratories (UL) UL6500 / UL60065 / IEC 60065 paragraph 9.1.1. With the unit AC switch first in the ON position and then in OFF position, measure from a known earth ground (metal waterpipe, conduit, etc.) to all exposed metal parts of the unit (antennas, handle bracket, metal cabinet, screwheads, metallic overlays, control shafts, etc.), especially any exposed metal parts that offer an electrical return path to the chassis. Any current measured must not exceed 0.5 milliamp. Reverse the unit power cord plug in the outlet and repeat test. ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE ELIMINATED BEFORE RETURNING THE UNIT TO THE CUSTOMER. B. Insulation Resistance Test Cold Check-(1) Unplug the power supply and connect a jumper wire between the two prongs of the plug. (2) Turn on the power switch of the unit. (3) Measure the resistance with an ohmmeter between the jumpered AC plug and each exposed metallic cabinet part on the unit. When testing 3 wire products, the resistance measured to the product enclosure should be between 2 and infinite MOhms. Also, the resistance measured to exposed input/output connectors should be between 4 and infinite MOhms. When testing 2 wire prod- ucts, the resistance measured to exposed input/output connectors should be between 4 and infinite MOhms. If it is not within the limits specified, there is the possibility of a shock hazard, and the unit must be repaired and rechecked before it is returned to the customer. CAUTION: The Bose ® PackLite TM Model A1 Amplifier contains no user-serviceable parts. To prevent warranty infractions, refer servicing to warranty service stations or factory service. PROPRIETARY INFORMATION THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF BOSE CORPORATION WHICH IS BEING FURNISHED ONLY FOR THE PURPOSE OF SERVICING THE IDENTIFIED BOSE PRODUCT BY AN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF THE BOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR USED FOR ANY OTHER PURPOSE. The Bose PackLite Model A1 Amplifier is covered by a limited 1-year transferable warranty. WARRANTY