Kenwood-RXDM-47-MP-Service-Manual电路原理图.pdf

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1、COMPACT Hi-Fi COMPONENT SYSTEMRXD-M47MPSERVICE MANUAL(HM-437MP)2004-10 PRINTED IN KOREAB51-5934-00 (K/K) 71570%In compliance with Federal Regulations, following are repro-duction of labels on, or inside the product relating to laserproduct safety.KENWOOD Corp. certifies this equipment conforms to DH

2、HSRegulations No.21 CFR1040. 10, Chapter 1, subchapter J.DANGER : Laser radiation when open and interlock defeated. AVOID DIRECT EXPOSURE TO BEAM.Caution: No connection of ground line if disassemble the unit. Please connect the ground line on rear panel, PCBs, Chassis and some others.CD cover assy(F

3、07-2030-08)Phone jack(E63-1365-08)Power knob(K29-8426-08)Display/Rec. knob(K29-8428-08)Search knob(K29-8430-08)Cass lid assy(A53-2455-08)Front cabinet(A60-2427-08) Volume knob(K29-8429-08) CD/Tuner/Tape knob(K29-8431-08) EQ/Bass knob(K29-8427-08)CONTENTS / ACCESSORIES / CAUTIONS.2EXTERNAL VIEW.3ADJU

4、STMENT.4PC BOARD.9SCHEMATIC DIAGRAM.13EXPLODED VIEW.19SPECIFICATIONS.BACK COVERRemote control unit (1)(A70-1692-08)AM loop antenna (1)(T90-0908-08)ANT TERMI CVR(F07-2029-08)Batteries (R6/AA) (2)()Plug in the AC power cord to the wall out-let, and within 5 seconds, press and holddown the button and p

5、ress CD button.The marking of products using lasersThe marking this product has been classified as Class 1.Itmeans that there is no danger of hazardous radiation out-side the product.Location: BottomCLASS 1 LASER PRODUCTLASER KLASSE 1APPAREIL A LASER DE CLASSE 1LUOKAN 1 LASERLAITEKLASS 1 LASERAPPARA

6、TResetting the MicrocomputerThe microcomputer may malfunction (unit can-not be operated, or shows an erroneous dis-play)if the power cord is unplugged while thepower is ON, or due to some other externalfactor. If this happens, execute the followingprocedure to reset the microcomputer and re-turn the

7、 unit to its normal operating condition.Please note that resetting the microcomputerwill clear the contents of the memory andreturn the unit to the state it was in when itleft the factory.RXD-M47MP2CONTENTS / ACCESSORIES / CAUTIONSAccessoriesCautions System configurationSYSTEMRECEIVERSPEAKERHM-437MP

8、RXD-M47MPLS-M47ContentsRXD-M47MP3EXTERNAL VIEWRear cabinet(A80-4503-08)Antenna cover(F07-2029-08)Speaker terminal(E70-0196-08)AC power cord(E30-7343-08)RXD-M47MP4ADJUSTMENTSERVICE ADJUSTMENTLubricationThe mechanical parts are factory coated with a thin coat of light grease and should not require fur

9、therlubrication.If a light grease is applied, be careful not to get any grease on the play/record head or erasehead, hubs, pulleys, tapes reels, drive belts, or switches.Use a good lubricant such as Silicon Lube G322Lor Lubricate.Service CheckBefore aligning the mechanism, wipe off any accumulated d

10、irt with denatured alcohol.Wipe around partswhere the tape contacts and around all rotating parts.Drive belts are specially processed.Do not cleanthem with alcohol.Mechanical TorqueUse a cassette type torque gauge and check the tape mechanism.Take-up torque 35 to 70 g-cmRewind torque 50 g-cm min.Fas

11、t forward torque 50 g-cm min.Pinch Wheel PressureNo adjustment to the pinch roller spring is necessary.It should be sufficient to give at least 40 g-cm pullforce.Tape Head ServicingEach time the unit is serviced, the face of all heads should be thoroughly cleaned with denatured alcohol orcommercial

12、head cleaning solution.The playback head should be demagnetized with a commercialdemagnetizer.Accumulation of tape oxide during normal operations can cause problems,including loss ofhigh frequencies and wow and flutter.Erase HeadThe erase head is properly aligned when the tape rides directly between

13、 the tape guide on the head withoutcrinkling the tape.RXD-M47MP5ADJUSTMENTPlay/Record and Playback Head Azimuth AdjustmentTo adjust the play/record and playback head azimuth screw:1. Connect two (2) VTVMs and a dual trace scope to the stereo headphone jack (as shown) with a 32 ohm dummy load. (See F

14、igure 1.)VTVMVTVMDUMMYLOADJK801SCOPECH1CH2Figure 1. Azimuth Adjustment2. Insert a 10 kHz test tape (Teac MTT-1141V or Equivalent) into the tape mechanism and play it back.3. While playing back the test tape, slowly turn the azimuth adjusting screw until the amplitude of both channel output waveforms

15、 is maximum and in phase. (See Figure 2.)4. Secure the azimuth screw in place with glue or paint after making the adjustment.Figure 2. Head Output SignalRXD-M47MP6ADJUSTMENTTape Speed Adjustment1. Set the function switch to TAPE.2. Connect a frequency counter with a 32 ohm dummy load to the stereo h

16、eadphone jack. (See Figure 3.) FREQUENCY COUNTERDUMMY LOADJK801Figure 3. Tape Speed Adjustment3. Insert and play back a 3 kHz test tape (Teac MTT-111 or Equivalent) into the tape mechanism.4. Insert an insulated alignment tool and adjust the tape speed potentiometer (MOTOR) until the frequency count

17、er indicates 2940 Hz to 3090 Hz.Bias Oscillator Frequency and Level Adjustment1. Set the function switch to TAPE and the record and play tape mechanism to RECORD.2. Connect a VTVM and frequency counter to test point R/P HEAD.3. Adjust bias oscillator coil T360 until the frequency counter indicates 8

18、1 kHz 0.5 kHz.4. Confirm the record head voltage equal to: 6-12V.5. Confirm the erase head voltage equal to: 15-24V.RXD-M47MP7ADJUSTMENTTUNER ALIGNMENT PROCEDUREEquipment needed:1. AM Signal generator2. FM Signal generator3. DC Voltage meter4. Oscilloscope5. Output meter (VTVM)AM AlignmentStep S/G F

19、requencyDial SettingIndicatorAdjust Remarks 1 450 kHz(1kHz30% mod.) 612 kHzConnect oscilloscope orVTVM to speakerjackT201 Adjust until maximum output 2 531 kHz(1kHz30% mod.) Lowend Connect DC voltage meter to test point Vt and ground T202 Adjust until Vt equal to 1.5 0.05V 3 1602 kHz(1kHz30% mod.) H

20、igh end Same asstep 2 ConfirmVt: 6.58.5V 4 612 kHz(1kHz30% mod.) 612 kHzSame asstep 1 T203 Maximumoutput 5 1404 kHz(1kHz30% mod.)1404 kHzSame asstep 1 VC201 Maximumoutput 6 Repeat steps4 and 5 to minimize tracking error7 999 kHz(1kHz30%mod.)999 kHzSame asstep 1 Offset islessthan 6 dB. 60 cmAMSIGNALG

21、ENERATORAMLOOPANTAMLOOPANTENNADUMMYLOADTEST UNITVTVMR-OUTL-OUTGNDFigure 4. AMIF/RF Tracking TESTUNITGROUND METERFigure 5.AMBand FrequencyCoverageAlignment Vt DC RXD-M47MP8ADJUSTMENTFMAlignment: Figure 6.FMBand FrequencyCoverageAlignment Connect FMS/G to ANTinputs (mod 1 kHz 22.5kHz dev.) Step S/G Fr

22、equencyDial Setting IndicatorAdjust Remarks 1 87.5 MHzLowend Connect DC voltage meter to test point Vt and ground L203 Adjustuntil Vt equal to: 1.5 0.05V 2 108 MHzHigh end Sameasstep 1 ConfirmVt: 7-9V 3 90.1 MHz90.1 MHzConnect oscilloscope orVT/VM to speakerjackL204 Adjustuntil Maximumoutput 4 106.1

23、 MHz106.1 MHzSameasstep 3 VC202 Adjustuntil maximumoutput 5 Repeat steps3 and 4 to minimize tracking error.FMGENERATORDUMMYANTENNATP1TEST UNITOSCILLOSCOPEDUMMYLOADVTVMR-OUTL-OUTGNDFigure 7. FM Band/Tracking GROUND METERVt DC TESTUNIT9ACEBD2 1357 46Refer to the schematic diagram for the value of resi

24、stors and capacitors. PC BOARD (Component side view)U101Q101D107Q106Q104LCD101CN107CN109CN104CN105D102D101Q103Q105CN108CN103D103CN101CN102CN106DISPLAYCN110LED182LED181LED180SW107FRONT KEYD106Q182Q181Q180SW113SW102SW101CN112SW100SW108SW103SW110SW111SW106CN111SW104SW109SW105SW112D105D104U102SW114SW115

25、SW116SW117SW118CN113R143 R174R144R145R101R104C104R100C108R107R135R142R140R141R139R137R138R136C121C122C107110050 5181803031C110R4R110R109R108R103C102C115R120R121C113R119R118R117C112R115R125R1R149R113R112R148R123R124C111R3R128R129R130R131R132R133R134C116C119C105C016R2R114C114R5C120J613J21R116R122J22J1

26、8R102J1J19J16J20J23J24J25J2J3J5J9J10R147J7X102X101C101C103J8C109J15J12J14J17J13R146L101J4R111J11401101818511 31391 6 11EBBEBEECECR150R160R169R170R171R172R151R152R153R154R155R168R156R164R165R167R166 R159R163R162R157R158R161C118C117R180R181R182R186BEBEBEC183R185R173R183R188R184POWERRDS/DISPLAYC180TIME

27、 SETTIMER ON/OFFRECVOLUME UPTAPE11513IGO6VOLUME DOWNTUNER/BANDCDEQ/BASSREPEATPROG.PRESETDOWNPRESETUP61TOP KEY10FGIHJ2 1357 46Refer to the schematic diagram for the value of resistors and capacitors.PC BOARDCN705U703U702CN701CN707CN706CN703CN700CN704Q707Q703Q702Q706Q704Q701Q705U705U700U701U706U704MP3

28、 (SIDE A)MP3 (SIDE B)ZD703ZD702ZD701L703L707L701L702L706X701L704C747C779C709C710GND1C734C754C713C707C735C733C705C770C722C723C740GNDC782C780RFC724C704C702C715C711C708C720C719C752L708L709C768C706L710C700L705R768R769R770R771R772R760R761R762R763R764R765R766R767C766C703C701R708R706R707R750C767R774R775R77

29、6R777R778R779R780R787R788R791R792C788C791R717R759C716R790R793C778GNDGND1R748R743R747R745R739R736R737R746R744R735R785R784R782C775R781R783R718R703R704R716C750R701R741C758C756R749C745C755R751C760R773R801R720C787C758C784C786C757C726C730C725C771C772C773C774C776C743C728R727C727R721C742R726C731C732C789C729

30、R802R734C764R757R758C761R755C762R754C765R753R752C759C763R719R800R728R795R796R798R740R797C721R756R803R804C769C712R711C714C717C718C783C790C753R722R723R725C744R724C749C746R738R789C737C739C741C748R786R730R729C736R731R733C738R732C781R742C751R70210161521112241361211303150 5180811001511630116484964 33173211632 171714831 3OGI1131BEBEBEBEBEBEBE