Bose-1800V-pwr-sm维修电路原理图.pdf

1Table of ContentsSAFETY INFORMATION. 2ELECTROSTATIC DISCHARGE SENSITIVE (ESDS) DEVICE HANDLING . 3SPECIFICATIONS . 4FREQUENCY CURVES. 6Figure 1. 402 EQ Card HF Only Response . 6Figure 2. 402 EQ Card Full Range Response . 6Figure 3. 502A EQ Card HF Only Response . 7Figure 4. 502A EQ Card Full Frequency Response . 7Figure 5. 502B EQ Card Response . 8Figure 6. 802 EQ Card HF Only Response . 8Figure 7. 802 EQ Card Full Range Response . 9Figure 8. 1800-V Block Diagram. 10THEORY OF OPERATION .111. GENERAL.112. CIRCUIT DESCRIPTIONS. 123. PROTECTION CIRCUITRY . 171800-V DISASSEMBLY/ASSEMBLY PROCEDURES. 20Figure 9. Covers Attaching Hardware . 20Figure 10. Rear View - Attaching Hardware. 22Figure 11. 240V Configuration . 22Figure 12. 1800-V Amplifier Assembly . 22Figure 13. Bottom Mounted Components. . 25Figure 14. Side View - Bottom Mounted Components. 25Figure 15. Heatsink Bridge . 26TEST PROCEDURES. 29AMPLIFIER TEST PROCEDURES . 29EQ CARD TEST PROCEDURES . 30PART LISTS AND EXPLODED VIEWS . 331800-V MAIN ASSEMBLY PART LIST . 34Figure 16. Front Panel Views. 37Figure 17. Back Panel View. 37Figure 18. Cross Section View. 37Figure 19. Top Down Inside Views. 381800-V PACKAGING PART LIST . 39Figure 20. 1800-V Amplifier and EQ Card Packaging Illustration . 391800-V ELECTRICAL AND MECHANICAL PART LISTS . 40Display PCB Electrical Part List . 40I/O PCB Electrical Part List . 42Power Supply PCB Electrical Part List . 45Regulator PCB Electrical Part List . 49Power Switch PCB Electrical Part List . 51Amplifier PCB Electrical Part List. 52Output PCB Electrical Part List . 55Input Module PCB Electrical Part List . 57402 Equalizer PCB Assembly Electrical Part List . 60502A Equalizer PCB Assembly Electrical Part List. 61502B Equalizer PCB Assembly Electrical Part List . 63802 Equalizer PCB Assembly Electrical Part List . 64WIRING DIAGRAMS . 66Figure 21. 1800-V Wiring Diagram . 66Figure 22. 1800-V 240V Wiring Diagram Variation Difference. 67SCHEMATICS AND PCB LAYOUTS . 68402 Equalizer Card Schematic . 69502A Equalizer Card Schematic . 70502B Equalizer Card Schematic . 71802 Equalizer Card Schematic . 72402, 502A AND 802 Equalizer Card PC Board Layout, P/N 177328, Revision 01 . 73502B Equalizer Card PC Board Layout, P/N 178860, Revision 0 . 74CAUTION: THE 1800-V PROFESSIONAL STEREO POWERAMPLIFIER SYSTEM CONTAINS NO USER-SERVICEABLE PARTS.TO PREVENT WARRANTY INFRACTIONS, REFER SERVICING TOWARRANTY SERVICE STATIONS OR FACTORY SERVICE.RadioFans.CN 收音机爱 好者资料库21. Parts that have special safety characteristics are identified by the symbol onschematics or by special notes on the parts list. Use only replacement parts that havecritical characteristics recommended by the manufacturer.2. Make leakage current or resistance measurements to determine that exposed partsare acceptably insulated from the supply circuit before returning the unit to thecustomer. Use the following checks to perform these measurements:A. Leakage Current Hot Check-With the unit completely reassembled, plug the ACline cord directly into a 120V AC outlet. (Do not use an isolation transformer duringthis test.) Use a leakage current tester or a metering system that complies withAmerican National Standards Institute (ANSI) C101.1 Leakage Current for Appli-ances and Underwriters Laboratories (UL) 1492 (71). With the unit AC switch first inthe 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 cordplug in the outlet and repeat test. ANY MEASUREMENTS NOT WITHIN THE LIM-ITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUSTBE ELIMINATED BEFORE RETURNING THE UNIT TO THE CUSTOMER.B. Insulation Resistance Test Cold Check-(1) Unplug the power supply and con-nect a jumper wire between the two prongs of the plug. (2) Turn on the power switchof the unit. (3) Measure the resistance with an ohmmeter between the jumpered ACplug and each exposed metallic cabinet part on the unit. When the exposed metallicpart has a return path to the chassis, the reading should be between 1 and 5.2Megohms. When there is no return path to the chassis, the reading must be infi-nite. 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.PROPRIETARY INFORMATIONTHIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OFBOSE CORPORATION WHICH IS BEING FURNISHED ONLY FORTHE PURPOSE OF SERVICING THE IDENTIFIED BOSE PRODUCTBY AN AUTHORIZED BOSE SERVICE CENTER OR OWNER OF THEBOSE PRODUCT, AND SHALL NOT BE REPRODUCED OR USEDFOR ANY OTHER PURPOSE.SAFETY INFORMATIONRadioFans.CN 收音机爱 好者资料库3ELECTROSTATIC DISCHARGE SENSITIVE (ESDS)DEVICE HANDLINGThis unit contains ESDS devices. We recommend the following precautions whenrepairing, 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 conduc-tive floor mats. Avoid touching the leads or contacts of ESDS devices or PC boards even if prop-erly grounded. Handle boards by the edges only. Transport or store ESDS devices in ESD protective bags, bins, or totes. Do notinsert unprotected devices into materials such as plastic, polystyrene foam, clearplastic bags, bubble wrap or plastic trays.4SPECIFICATIONSPerformance SpecificationsSize:3.5H (2U) x 19 W x 13.25 D89mm x 483mm x 337mmWeight:Net 30 lbs. (13.6 kgs)Shipping 36 lbs. (16.3 kgs)Display:7 LED indicators per channel1 green READY, 5 yellow SIGNAL, 1 redCLIP/PROTECTOperating Temperature:0 to 50 C, up to 85% RHPower OutputContinuous Average Output Power, bothchannels driven:450 watts per channel into 8 ohms from 20 Hz to20 kHz, with no more than 0.2% THD600 watts per channel into 4 ohms from 20 Hz to20 kHz, with no more than 0.2% THDBridged-mono Operation:1400 watts into 8 ohms from 20 Hz to 20 kHz,with no more than 0.2% THDVoltage Output:61.6V line voltage per channel into 8 ohmsDynamic Headroom:1.0 dB nominalPower Bandwidth:5 Hz to 40 kHz (+0, -3 dB)Frequency Response:20 Hz to 20 kHz (0.75 dB)Channel Separation: 65 dB 1 kHz 55 dB 10 kHzDamping Factor:170Input Impedance:25 kilohms unbalanced, each leg to ground50 kilohms balanced*Sensitivity: High0.775V rms for rated power into 4 ohms 1 kHz57mV rms for 1W into 4 ohms 1 kHz Low1.5V rms for rated power into 4 ohms at 1 kHz116mV rms for 1W into 4 ohms 1 kHz*Gain: High36.2 dB ( 0.5 dB) Low30.2 dB ( 0.5 dB)Input Overload:+18 dBu*The amplifier sensitivity is set to 0.775V rms for rated output. To reduce the sensitivity by 6 dB to 1.5V rms,remove JP100 (CH1) and JP200 (CH2), located on the main amplifier board.5IM Distortion: 0.1%THD: 0.775V Sensitivity 0.2% 1.5V Sensitivity 100 dB, A-weighted, ref. to rated power into 4 ohms (high gain) 78 dBW, A-weighted, referenced to 1W into 4ohms (high gain)Slew Rate:10V/S (Bandwidth limited)40V/S (RFI filtering removed)CMRR: 80 dB 1 kHz (without Bose Input Module) 60 dB from 20 Hz-20kHz (without Bose InputModule)Power Consumption:40W at idle800W with musical program1500W at full power into 8 ohms (continuous)2400W at full power into 4 ohms (continuous)Power Requirements:120VAC/50-60 Hz220-240VAC/50-60 Hz100VAC/50-60 HzFusing:15 amp slo-blo (125V/60 Hz)8 amp slo-blo (230V/50Hz)Figure 2. 402 EQ Card Full Range ResponseFigure 1. 402 EQ Card HF Only ResponseFREQUENCY CURVES6Figure 3. 502A EQ Card HF Only ResponseFigure 4. 502A EQ Card Full Frequency Response7Figure 6. 802 EQ Card HF Only ResponseFigure 5. 502B EQ Card Response8Figure 7. 802 EQ Card Full Range Response910BLOCK DIAGRAMAmplifierCH 1CH 2CH 2CH 1CH 1CH 2OUTOUTCH 1OUTCH 2OUTOutput?RelaysFan DriveCommutation?Control(Class H)Power SuppliesOn/Off?StandbyPowerFuse(230V)?OnlyRegulation?Phase ControlLowpass?FilterTemperature?SenseProtectionDisplay?DriveDisplayLevel?ControlSequence?ControlInput ?ModuleBose?EQLine?FilterSequenceHNACCH 1CH 2InputSendRCVCH 1CH 2Figure 8. 1800-V Block Diagram11THEORY OF OPERATION1. GENERALThe Bose Model 1800-V Professional Stereo Power Amplifier is an installed/portable amplifier made forprofessional sound applications. It is a two-channel amplifier rated at 600 watts into 4 ohms and 450watts into 8 ohms. In the bridged-mono setting it can deliver 1400 watts.The protection circuits designed into the amplifier will protect the system from unexpected faults,excessive temperature, continuous current limiting and shorted outputs.The balanced inputs use high quality, high common-mode rejection differential amplifiers for exceptionalhum and noise rejection.Through the use of equalization cards the amplifier can provide active equalization for Bose 402,502A, 502B and 802 professional loudspeakers. These cards fit into the J6, Channel 1 and J7, Channel2 connectors located on the Input Module motherboard.Additional Features are as follows: Two input connectors per channel allow 1/4 TRS, XLR, or quick connect terminal block connection Two input connectors for each channel are wired in parallel Accepts balanced or unbalanced lines Independent CH 1 and CH 2 Level Controls with 11 detented positions Level Control Defeat Switch Dual Mono Mode for combining the power of both channels into a single higher powered channel Sequencer connection for sequentially powering-up multiple amplifiers to limit instantaneous in-rush current Bi-Amp/Full Range configurable Internally configurable for Parallel Mono mode for single channel low impedance operation Internally configurable for 0.775V or 1.5V rms input sensitivity Internally configurable input polarity of XLR connectors Class H dual-rail power supply Additional protection circuitry includes Clipping Eliminator, AC Lines Fuse Power Connected/Standby Indicator 7 LED display per channel, including power ready and Clip/Protect indicators Two-speed fan cooled122. CIRCUIT DESCRIPTIONSThis section discusses the theory of operation of the 1800-V Amplifier. For a better understanding of thecircuitry involved, refer to the schematics included with this manual. Component pin designation isnotated as follows: U1-7 means U1 at pin 7.Unless otherwise noted, this discussion centers around the CH 1 circuitry. The CH 2 circuitry isessentially identical.2.1 Input ModuleThe Input Module consists of signal input connections, mode switching, optional equalization, and powersequencing circuitry. The module operates from +15V and -15V, supplied by the host amplifier throughJ2-2 and J2-1 respectively.The signal inputs are designed for balanced connection, though unbalanced inputs can be configured byproper input wiring. Channel 1 (CH1) line-level inputs are made via P4 and J4, Channel (CH2) inputconnections are made via P1 and J5. P4 and P1 allow for the insertion of either male XLR or phoneplugs. The phone plug terminations are: tip positive (+), ring negative (-), and sleeve ground. The XLRconnections pins 2 and 3 are user configurable. As shipped, jumper blocks JB2 and JB1 have jumpersbetween pins 2 to 3 and 5 to 6. This jumper configuration assigns XLR pin 2 to positive (+) and pin 3 tonegative (-), pin 1 is ground in all configurations. If the jumpers are placed across JB1/JB2 pins 1 to 2 and4 to 5 the XLR pin assignment becomes pin 2 negative (-), and pin 3 positive (+). The Euro-block terminalblock connectors J4 and J5 assignments are: pin 1 positive (+), pin 2 negative (-), and pin 3 ground.The CH1 input signal is applied to ICs U1, and the CH2 signal to U2. U1 and U2 are unity gain (0 dB)differential amplifiers (SSM2141). These inputs are protected against RFI (Radio Frequency Interference)and ESD (Electro-Static Discharge). The signals are then routed to the A inputs of op-amp/switch ICs(BA3128) U4 (CH1) and U3 (CH2) and to EQ card connectors J6-4 and J7-4 respectively. The switchs Binputs are driven by the output of the EQ cards via J6-5 and J7-5.The input module detects the presence of EQ cards via J7-6 and J6-6. Without the card installed thesepins are pulled high (+15V) which keeps both CH1 and CH2 sections of dual LED D23 extinguished. Thislogic high signal is also applied to the control pins of the switch ICs which selects the A (unequalized)input. When an EQ is plugged into J7 and/or J6 pin 6 the EQ is detected and pulls the control pin low(+7.5V), turning on the corresponding LED(s) and switching the IC to the B input which selects the outputof the EQ card.On some EQ cards the equalization can be modified for either full range “FULL BANDWIDTH” or bi-amplified “HF ONLY” operation. The equalization mode switch SW2 selects either FULL BANDWIDTH orHF ONLY modes of the EQ cards installed. These control signals are sent to the EQ cards via J6-7, 8 andJ7-7, 8.The selected signals from U4 and U3 are buffered by U7B and U7A which are wired to P2 and P3. Thesephone connectors provide balanced, buffered, equalized outputs (if an EQ card is installed) to driveadditional amplifiers or other equipment. This allows external equipment to provide equalized signalswithout the need for additional equalization. The pin assignment for these connectors are the same as forthe input phone connectors P1B and P4B. The output circuitry is also protected from RFI and EMI.13The amplifier can be operated in four different output modes: normal (two independent channels) dualmono (one input channel, two separate channels), bridged mono, or parallel mono. These modes areselected via SW1 and control the operation of op-amp/switching ICs U6 and U5. Parallel mono operationrequires internal modifications to the amplifier, contact the local Bose Pro Product dealer for informationon parallel mono operation.When SW1 is set to the NORMAL mode, CH1 and CH2 operate independently. In this mode a logic highis applied to the control pins of U6 and U5. This routes the outputs of U4 and U3 to their respectivechannels in the amplifier via J1-20 and J1-16.In DUAL MONO mode both amplifier channels are driven by the signal applied to the CH2 input. U6-1 isdriven high (+15V) and U5-1 is driven low (+7.5V), selecting CH2 to drive both channels of the amplifier.In BRIDGED MONO operation the CH2 signal is routed directly from the equalizer switch U3 to theamplifier inputs. U5 control pin 1 is driven low (+7.5V) selecting the inverting input of the op-ampswitching IC signal. This inverting signal is then sent to the B input of U6 whose control signal at pin 1 isdriven low selecting the B input. This routes the inverted signal to the CH1 input of the amplifier.For information on sequence operation see Section 2.8, Sequence Send/Receive.2.2 Power Amplifier CircuitryThe 1800-V uses a conventional class AB push-pull power amplifier circuit, with a commutated two-stage(dual-rail, class H) power supply. U100A-1 is the input stage, providing