Bose bma 125 manual
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1 Table of Contents SAFETY INFORMATION ............................. 2 Electrostatic Discharge Sensitive (ESDS) ............... 3 120V Version Specifications ..................... 4-5 230V Version Specifications ..................... 6 120V Disassembly/Assembly Procedures ................... 7-9 230V Disassembly/Assembly Procedures ................ 10-12 BMA-125 Test Procedures 120V ...................... 13-16 BMA 125 Test Procedures 230V ........................... 16 Part List Notes ................................. 17 120V Main Assembly Part List .......................... 18 Figure 1. 120V Chassis Layout ...............................19 120V Amp PCB Part List .............................. 20-22 120V Tone/Volume Control PCB Part List ......................... 23-24 120V Equalizer PCB Part List ..................................... 25-26 230V Main Assembly Part list ................................. 27-28 230V Amp PCB Part List ......................................... 29-31 230V Tone/Volume/Equalizer PCB Part List ...................... 32-35 Input Module 2B37 Part List ........................................ 36 Input Module 2B50 Part List .................................... 37-38 Figure 2. 2B37 Schematic and PCB Layout .................................39 Figure 3. 2B50 Schematic and PCB Layout ...........................40 Figure 4. 120V Driver PCB Layout ..................................41 Figure 5. 120V Tone/Volume Control PCB Layout ..........................41 Figure 6. 120V Equalizer PCB Layout (Solder Side) ...........................42 Figure 7. 120V Equalizer PCB Layout (Component Side) ...........................42 Figure 8. 230V Driver PCB Layout .........................................43 Figure 9. 230V Tone/Volume/Equalizer PCB Layout ............................44 Figure 10. and 11. 230V wiring diagram ................................45-46
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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) 1492 (71). With the unit AC switch first in the ON position and then in OFF position, measure from a known earth ground (metal water pipe, conduit, etc.) to all exposed metal parts of the unit (antennas, handle bracket, metal cabinet, screw heads, 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 milliampere. 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 the exposed metallic part has a return path to the chassis, the reading should be between 1 and 5.2 Megohms. When there is no return path to the chassis, the reading must be "infinite". If it is not within the limits specified, there is the poss- ibility of a shock hazard, and the unit must be repaired and rechecked before it is returned to the customer.