Bose-550-rec-sm维修电路原理图.pdf
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1、Model 550 AM/FM Stereo Receiver Part Number 112429 REV 01 Service Manual RadioFans.CN 收音机爱 好者资料库 2 Contents Safety Information. 3 Electrostatic Discharge Sensitive (ESDS) Device Handling . 4 Specifications.5-6 Technical Description . 7 Disassembly/Assembly Procedures . 8-10 Figure 1. Antenna Placeme
2、nt Diagram . 10 Test Procedures . 11-14 Figure 2. AM/FM Adjustment Location . 12 Figure 3. Amp Adjustment Location . 14 Figure 4. Block Diagram. 15 Figure 5. Wiring Diagram . 16 Figure 6. Main PCB Layout . 17 Figure 7. PCB Layout. 18 Figure 8. Exploded View . 19 Figure 9. Dial String Diagram. 20 Fig
3、ure 10. Pinout Location Diagram. 21 Part List Notes. 22 Part List. 23-30 Voltage Conversion Instructions . 31 RadioFans.CN 收音机爱 好者资料库 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 repl
4、acement 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 m
5、easurements: 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 (AN
6、SI) 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,
7、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
8、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 un
9、it. (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 readin
10、g 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 This unit contains ESDS devices. We recommend th
11、e 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
12、 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. CAUTION: THE 550 RECEIVER CONTA
13、INS NO USER-SERVICEABLE PARTS. TO PRE- VENT WARRANTY INFRACTIONS, REFER SERVICING TO WARRANTY SERVICE STA- TIONS OR FACTORY SERVICE. 5 SPECIFICATIONS Phono Overload:100 mV Loudness Contour:+8 dB 100 Hz (2 dB)+6 dB 12kHz (2 dB) AM Tuner:20 dB Usable Sensitivity Adjacent Channel Selectivity Total Dist
14、ortion Image Rejection IF Rejection Signal to Noise Ratio 350 uV (ferrite loopstick) 35 dB .9% (400 Hz 30% Modulation) 37 dB 45 dB 40 dB FM Tuner:IHF Usable Sensitivity 50 dB Quieting Sensitivity Frequency Response Signal to Noise Ratio 65 dBf THD 65 dBf Capture Ratio Alternate Channel Sensitivity S
15、purious Response Rejection Image Rejection AM Rejection Stereo Separation, 1kHz 2.0 uV/11.25 dBf (Mono) 3.5 uV/16.11 dBf (Stereo) 3.8 uV/16.82 dBf (Mono) 35 uV/37.27 dBf (Stereo) 30 Hz - 15kHz, +1.0 dB - 3.0 dB 65 dB (Mono) 60 dB (stereo) .25% (Mono) .50% (Stereo) 1.9 dB 60 dB 80 dB 65 dB 50 dB 40 d
16、B Channel Separation:AUX. and Tape Phono 60 dB 1kHz (at Tape - Out) 55 dB 1kHz (at Tape - Out) 6 SPECIFICATIONS Input Sensitivity Impedance: Capacitance: Aux. and Tape Phono 150 mV/ 50k Ohm 2.75 mV/ 47k Ohm, 150 pF Source and Room Compensation Controls: Low Filter Low Frequency Control Narrow Positi
17、on Wide Position High Frequency Control -3 dB 100Hz -7 dB max. 20Hz 8 dB 140Hz (center frequency) 1 dB 20Hz and 1kHz 3 dB 350Hz 8 dB 50Hz 8 dB 15kHz 3 dB 2.2kHz Frequency Response:20 Hz to 20 kHz Phono RIAA 0.5 dB 0.5 dB Amplifier Power Output: 40 Watts per Channel minimum RMS continuous power 8 Ohm
18、s, THD .3% 20Hz to 20kHz IHF Power Bandwidth:20Hz to 20kHzboth channels driven THD .19% Intermodulation Distortion: .09% IHF 60 Hz/7kHz 4:1 mixed at rated output Signal to Noise Ratio:Amplifier Phono 87 dB A- weighted (below rated output) inputs shorted 91 dB A- weighted (below rated output) min. vo
19、lume 76 dB A- weighted (below rated output) inputs shorted Power Requirements:120 Volts AC 60 Hz (USA model) 220 Volts AC 50-60 Hz (export model) Power Consumption:360 Watts at rated power AC Outlets:1 switched, 1 unswitched400 watts max. Dimensions:18 1/4 x 5 3/4 x 12 1/4 46.6 (w) x 14.6 (h) x 31.1
20、 (d) cm Weight:15 1/2 lbs7 Kg 7 The Model 550 AM/FM Stereo Receiver features a high quality AM/FM Stereo tuner and a direct-coupled amplifier with 40 watts of RMS power per channel. The Model 550 includes a built-in 901 Series IV equalizer, that provides extra value and convenience to present owners
21、 and future purchasers of Bose 901 loudspeakers. The built-in equalizer can be switched into the circuit when playing Bose 901 Series III or Series IV speak- ers. You can pre-set the Model 550 via the rear panel switches for various combinations of loudspeakers. This provides correct equqlization wh
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