Bose-1800-pwr-sm维修电路原理图.pdf

Bose Model 1801/1800 Power Amplifiers 1997 Bose Corporation Part Number 192527 REV 01 Service Manual RadioFans.CN 收音机爱 好者资料库 1 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. Contents Specifications. 2 Safety Information. 3 Electrostatic Discharge Sensitive (ESDS) Device Handling . 4 Disassembly/Assembly Procedures . 5-8 Test Procedures . 9 Figure 1. 1801 Component Location. 10 Figure 2. 1801 Side View . 10 Figure 3. 1800 Front Panel . 11 Figure 4. 1800 Rear View of Front Panel . 11 Figure 5. 1801 Rear View of Front Panel . 11 Figure 6. 1800 Rear Panel . 12 Figure 7. 1801 Rear Panel . 12 Part List Notes. 13 Figure 8. 1801 Front Panel . 13 Part List. 14-17 Figure 9. 1801/1800 Block Diagram. 18 Figure 10. LED PCB Layout. 19 Figure 11. LED PCB Schematic Diagram . 20 Figure 12. Amplifier Schematic Diagram. 21 Figure 13. Amplifier PCB Layout . 22 Troubleshooting Guide. 23 Voltage Conversion Instructions . 24 Service Bulletin . 25-28 RadioFans.CN 收音机爱 好者资料库 2 SPECIFICATIONS Mechanical Dimensions:1801 1800 7 3/16 H x 18 W x 18 1/2 D (Including Knobs) 81/4H x 19W x 15D (not including handles) Weight:1801 1800 82 lbs 95 lbs (shipping) 80 lbs 91 lbs (shipping) Power Requirements Voltage:105-125 AC USA, 210-250 AC EUR Frequency:50-60 Hz Power Consumption:Minimum 60 watts Normal 1000 watts Maximum 1960 watts Integral Design Amplifier Output : (both channels operating ) 250/250 watts 8 ohms 400/400 watts 4 ohms Harmonic Distortion: (THD) 250 watts Less Than .15% (20Hz-5kHz) Less Than .5% (5kHz-10kHz) IM Distortion: (4:1 60-7kHz) 150 watts Less Than .15% Frequency Response:20Hz-10kHz .25dB 10kHz-15kHz .7dB 15kHz-20kHz 1dB Signal to Noise Ratio: (unweighted) -100dB .5mV across 8 at zero volume Load Impedance:4 ohms or higher Input Sensitivity:1.5 Vrms for 250 watts output into 8 ohms Input Impedance:50,000 ohms or higher 3 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, then in the 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, 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 HAZ- ARD 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 be- tween 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 possibility of a shock hazard, and the unit must be repaired and re- checked before it is returned to the customer. 4 ELECTROSTATIC DISCHARGE SENSITIVE (ESDS) DEVICE HANDLING CAUTION: THE BOSE 1801/1800 POWER AMPLIFIERS CONTAIN NO USER-SERVICE- ABLE PARTS. TO PREVENT WARRANTY INFRACTIONS, REFER SERVICE TO WAR- RANTY SERVICE STATIONS OR FACTORY SERVICE. This unit contains ESDS devices. We recommend the following precautions when repairing, replacing or transporting ESDS devices: Perform work at an electrically grounded work station. Wear wrist straps that connect to the station or heel straps that connect to conductive floor mats. Avoid touching the leads or contacts of ESDS devices or PC boards even if properly grounded. Handle boards by the edges only. Transport or store ESDS devices in ESD protective bags, bins, or totes. Do not insert unpro- tected devices into materials such as plastic, polystyrene foam, clear plastic bags, bubble wrap or plastic trays. General Description The 1801 and 1800 are Integral Design Power Amplifiers with all Silicon Solid-State Circuitry using 14 power transistors per channel. Capable of complete stability with all loudspeaker loads regardless of capacitive or inductive character. They employ fast acting electronic pro- tection circuits for current limiting. They use computer grade capacitors throughout the power supply, along with a 2.0kW power transformer and 1300 sq. inches of heat sink area. They also have a power monitor display using a light emitting diode array and in the case of the 1801 signal meters as well. 5 DISASSEMBLY/ASSEMBLY PROCEDURES 1801 Power Amplifier Note: Refer to Figure 1 for the following procedures. 1. Top Cover Removal 1.1 Remove the two screws that secure the top cover at the rear of the unit. Loosen the two screws located on each side of the unit towards the front. 1.2 Slide the top cover towards the rear of the unit and lift the cover off the unit. 2. Top Cover Replacement 2.1 Slide the top cover onto the unit while making sure the screws on the side of the unit are lining up with the slots in the top cover. 2.2 Secure the top cover to the unit. 3. Amplifier PCB Removal 3.1 Perform procedure 1. 3.2 Disconnect the wire harness, the two wires connected to the thermal cutout, and the input cable going to the PCB. 3.3 Remove the six screws (2B) located on the side of the unit between the heat sink fins (see Figure 2). 3.4 Carefully pry the PCB inward towards the power transformer (the PCB is stuck to the chassis by the heat sinking compound) and lift the board out of the unit. 4. Amplifier PCB Replacement 4.1 Slide the PCB into place. Be sure there is sufficient heat sink compound on the PCBs heat sink. 4.2 Align the six screws that secure the PCB into place and secure the PCB to the chassis. 4.3 Connect the wire harness, thermal cutout wires, and the input cable to the PCB. 5. Front Panel Removal 5.1 Perform procedure 1. 5.2 Remove the nut securing the top of the front panel. The nut is located on the inside of the front chassis beside the thermal cutout indicator. 5.3 Remove the knobs on the controls and remove the two shaft nuts holding the front panel in place. 6. Front Panel Replacement 6.1 Align the front panel over the controls and secure it in place. 6.2 Secure the top of the front panel and replace the knobs. 6.3 Perform procedure 2. 7. Front Chassis Assembly Removal 7.1 Perform procedure 5. 7.2 Locate and remove the four screws that secure the front assembly to the chassis. 7.3 Push down on the top of the front assembly to release the bottom of the assembly and pull the assembly towards you. 8. Front Chassis Assembly Replacement 8.1 While pushing down on the front assembly slide the assembly in towards the unit. 8.2 Pull up on the front assembly to align the screw holes with the unit and secure the assembly in place. 8.3 Perform procedure 6. 6 1801 Power Amplifier DISASSEMBLY/ASSEMBLY PROCEDURES assembly. Connect the wires going to the meter. 12.2 Place the meter lamp housing over the meters and secure it to the front assem- bly. 12.3 Perform procedure 8. Note: Refer to Figure 5 for the following procedures. 9. LED PCB Removal 9.1 Perform procedure 7. 9.2 Unsolder the wires to the LED PCB and make a note of the wiring configura- tion. 9.3 Remove the center nut located on each side on the LED lamp housing. 9.4 Lift the LED assembly out from the front chassis. 9.5 Disassemble the LED assembly to gain access to the PCB. Note: Remember how the lamp housing spacers are placed. 10. LED PCB Replacement 10.1 After reassembling the LED assem- bly, place it onto the front panel assembly and secure it in place. 10.2 Resolder the wires to the PCB. 10.3 Perform procedure 8. 11. Meter Assembly Removal 11.1 Perform procedure 7. 11.2 Remove the three nuts holding the meter lamp housing assembly to the front panel assembly. 11.3 Remove the two nuts holding the wires to the meter you want to replace and remove the meter. 12. Meter Assembly Replacement 12.1 Place the new meter on to the front 13. Front Panel Controls Removal 13.1 Perform procedure 7. 13.2 Locate the control or switch you want to replace and unsolder the wires and components on that control or switch. 13.3 Remove the shaft nut holding the control or switch to the front assembly and remove it. 14. Front Panel Controls Replacement 14.1 Place the new control or switch into the front assembly and secure it in place. 14.2 Resolder the wires and/ or compo- nents to the control or switch. 14.3 Perform procedure 8. 15. Lamp Removal 15.1 Perform procedure 7. 15.2 Using a flat blade screwdriver, pry under the edge of the socket and lift the socket out. 16. Lamp Replacement 16.1 Replace the defective lamp. 16.2 Place the lamp socket back into the lamp housing. 16.3 Perform procedure 8. Note: It may be necessary to remove the LED PCB Assembly to replace the lamps see procedure 9. 7 DISASSEMBLY/ASSEMBLY PROCEDURES 5.2 Locate and remove the eight screws holding the front panel to the chassis. Four of the screws are located just inside the two handles and the other four are the larger screws on the front panel. 5.3 Using the handles pull the front panel away from the chassis enough to access the gain controls and LED PCB. 6. Front Panel Replacement 6.1 Slide the front panel into place. Be careful not to pinch the wiring harness at the bottom of the front panel between it and the chassis. 6.2 Align the holes in the front panel with the chassis, place the screws into their location by hand and then tighten with a screwdriver. Note: While tightening the screws lift up on the top lip of the panel to provide enough room to slide the top cover under the lip. 7. LED PCB Removal 7.1 Perform procedure 5. 7.2 Remove the two screws that secure the PCB to the front panel. 7.3 Unsolder the wires at the LED PCB, make a note of the wiring configuration, and remove the board from the unit. 8. LED PCB Replacement 8.1 Place the LED PCB into place on the front panel. 8.2 Secure the PCB to the front panel. 8.3 Resolder the wires to the LED PCB. Note: Refer to Figure 1 for the following procedures. 1. Top Cover Removal 1.1 Remove the four screws that secure the top cover to the unit. 1.2 Slide the top cover towards the back of the unit and lift it off. 2. Top Cover Replacement 2.1 Place the top cover on to the unit and slide it under the front panel lip. 2.2 Secure the top cover to the unit. 3. Amplifier PCB Removal 3.1 Perform procedure 1. 3.2 Disconnect the wire harness, input cable, and the two wires going to the thermal cutout. 3.3 Remove the six screws (2B) located on the side of the unit between the heat sink fins (see Figure 2). 3.4 Carefully pry the PCB inward towards the power transformer (the PCB is stuck to the chassis by the heat sinking compound) and lift the board out of the unit. 4. Amplifier PCB Replacement 4.1 Slide the PCB into place. Be sure there is sufficient heat sinking compound on the PCBs heat sink. 4.2 Align the six screws that secure the PCB into place and secure the PCB to the chassis. 4.3 Connect the wire harness, thermal cutout wires, and the input cable to the PCB. 5. Front Panel Removal 5.1 Perform procedure 1. 1800 Power Amplifier 8 1800 Power Amplifier DISASSEMBLY/ASSEMBLY PROCEDURES 13. Rear Panel Removal 13.1 Perform procedure 1. 13.2 Locate and remove the f