Bose-550-rec-sm维修电路原理图.pdf

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 Placement 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 Figure 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 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 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. CAUTION: THE 550 RECEIVER CONTAINS 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 Distortion 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 Spurious 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 dB 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 Position 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 Ohms, 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. volume 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 (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 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 when switching from one pair of speakers to the other. The receiver incorporates Source and Room Compensation Controls unique to Bose electronic equipment. These controls allow you to compensate more accurately for problems in room acoustics and recordings. The result is greater realism and enjoyment. TECHNICAL DESCRIPTION 8 DISASSEMBLY/ASSEMBLY PROCEDURES Note: Numbers in parentheses corre- spond to the callouts in Figure 8. 1. Top Cover Removal 1.1 Remove the 4 screws (A-14) located on each side of the unit. 1.2 Lift the top cover (A-2) off of the unit. 2. Top Cover Replacement 2.1 Place the top cover onto the top of the unit. 2.2 Secure the top cover to the unit. 3. Bottom Cover Removal 3.1 Remove the 5 screws (L-13) that secure the bottom cover (A-3) to the unit. 3.2 Remove bottom cover. 4. Bottom Cover Replacement 4.1 Place the bottom cover onto the unit. 4.2 Secure the bottom cover to the unit. 5. Front Panel Removal 5.1 Perform procedures 1 and 3. 5.2 Remove the volume, tuning, and slide pot knobs. 5.3 Locate and remove the 3 screws (L-3) that secure the front panel (A-1) to the top front of the unit. 5.4 Unclip the 4 plastic clips located at the bottom of the front panel and remove the panel from the unit. 6. Front Panel Replacement 6.1 Place the front panel onto the unit and clip the bottom of the front panel into place. 6.2 Secure the top of the front panel and replace the knobs. 7. 901 EQ PC Board Removal Note: There is no callout on Figure 8. for the EQ board. The 901 EQ board is located under the dial lamp and behind the slide pots. 7.1 Perform procedures 1 and 3. 7.2 Using a pair of pliers, unclip the three plastic standoffs holding the board in place. 8. 901 EQ PC Board Replacement 8.1 Align the standoffs over the holes in the main PC board. Push the 901 EQ board into place. 9. Slide Pot Removal 9.1 Perform procedures 5 and 7. 9.2 Unscrew the two screws (L-12) that secure each of the slide pots to the front of the unit. 9.3 Remove the slide pots through the bottom of the unit. 10. Slide Pot Replacement 10.1 Guide the slide pot assembly through the bottom of the unit and place it into the front of the unit. 10.2 Secure the slide pots to the unit. 9 DISASSEMBLY/ASSEMBLY PROCEDURES 11. Dial Lamp Assembly Removal 11.1 Perform procedure 1. 11.2 Carefully slide the dial lamp PC board to the left (with the unit facing you) and lift the board off of the clips. 11.3 Lift the board up towards the top of the unit and replace any defective bulbs. 12. Dial Lamp Assembly Replacement 12.1 Position the dial lamp PC board over the locking clips. 12.2 While aligning the clips with the holes in the PC board, carefully slide the board to the right to secure it to the lamp housing. 13. Selector Lamp Assembly Removal 13.1 Perform procedure 7. 13.2 Remove the screw (L-1) securing the PC board to the front housing. 13.3 Unclip the ends of the board and remove it from the housing. 13.4 Replace any bulbs that are defective. 14. Selector Lamp Assembly Replace- ment 14.1 Place the PC board into the housing and clip it into place. 14.2 Secure the board to the housing. 15. Meter Lamp Assembly Removal 15.1 Perform procedure 1. 15.2 Remove the screw (L-1) securing the meter lamp PC board to the housing. 15.3 Cut any tie wraps needed and re- move the PC board from the housing. 15.4 Replace any defective bulbs. 16. Meter Lamp Assembly Replacement 16.1 Place the PC board into the housing and secure it to the housing. 16.2 Replace any tie wraps that had been removed. 17. Volume Control Removal 17.1 Perform procedure 5. 17.2 Remove the nut securing the volume control to the front housing and remove the control from the rear of the housing. 18. Volume Control Replacement 18.1 Place the volume control through the rear of the front housing. 18.2 Secure the volume control to the front housing. 19. Power Switch Removal 19.1 Perform procedure 5. 19.2 Remove the two screws securing the power switch to the front assembly. 19.3 Remove the power switch through the bottom of the unit. 20. Power Switch Replacement 20.1 Place the power switch into the front assembly. 20.2 Secure the power switch to the front assembly. 10 TEST PROCEDURES 1. AM Tuner Adjustment Procedure Note: Refer to the antenna placement diagram Figure 1. 1.1 Connect an AM signal generator to an AM loop antenna. Set the frequency ac- cording to the AM alignment procedure listed below. 1.2 Connect a voltmeter to the tape output jacks on the rear panel. 1.3 Refer to the adjustment location chart (Figure 2.) for the location of the tuning coils called out in the AM alignment proce- dure. 2. FM/MPX Tuner Adjustment 2.1 Connect an FM signal generator to the antenna terminals on the rear panel. 2.2 Connect a voltmeter to the tape output jacks on the rear panel. 2.3 Refer to the adjustment location chart (Figure 2.) for the location of the tuning coils called out in the FM/MPX alignment procedure. 2.4 Perform the tests listed on the next page for the FM and MPX sections. AM Alignment Procedure ? ? ? ? ? ? ? ? ? ? ? ? STANDARD SIGNAL GENERATOR STANDARD SIGNAL GENERATOR 60cm TEST LOOPBAR ANTENNA (PLAN VIEW) (SIDE VIEW) ? ? ? ? ? ? ? ? ? ? ? ? ? Figure 1. Antenna Placement Diagram 11 TEST PROCEDURES MPX Alignment Procedure FM Alignment Procedure 12 Figure 2. AM/FM Adjustment Location 13 TEST PROCEDURES 3. Loudness Control Procedure Note: Use the following control settings. Slide pots centered, speaker A switch selected with the output connected to an 8 ohm load, all switches out except for the aux switch. 3.1 Apply a 100Hz signal at 1Volt to the aux input. 3.2 Rotate the volume control until 1.5 Vrms is measured at the output. 3.3 Reference a dB meter to the output. 3.4 Push the loudness switch IN. There should be a +8dB change in response at the output. 3.5 Change the signal to 12kHz and repeat step 3.3 and 3.4. There should be a + 6dB change in response at the output. 4. Low Filter Procedure 4.1 Perform procedure 3.1, 3.2, and 3.3. 4.2 Push the low filter switch IN. There should be a -3dB change in response at the output. 4.3 Change the input frequency to 20Hz and reference a dB meter to the output. 4.4 Push the low filter switch IN. There should be a -7dB change in response at the output. 5. Low Frequency Control Procedure 5.1 Apply a 140Hz signal at 1Volt to the aux input. 5.2 Rotate the volume control until 1.5 Vrms is measured at the output. 5.4 Slide the control from one side to the other. There should be a + 8dB and -8dB chan