Kenwood-RXDM-37-Service-Manual电路原理图.pdf

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1、COMPACT Hi-Fi COMPONENT SYSTEMRXD-M37-L/M37-SSERVICE MANUAL(HM-337)2004-8 PRINTED IN KOREAB51-5918-00 (K/K) 33970%70%CD cover assy(F07-2028-08)Power knob(K29-8426-08)Display/Rec knob(K29-8428-08)Search knob(K29-8430-08)Cass. Lid assy(A53-2451-08)EQ/BASS knob(K29-8427-08)Knob(K29-8431-08)Volume knob(

2、K29-8429-08)Front cab. assy *(A60-)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 DHHSRegulations No.21 CFR1040. 10, Chapter 1, subchapter J.DANGER : Laser radi

3、ation 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.*Refer to parts list on page 18.CONTENTS / ACCESSORIES / CAUTIONS.2EXTERNAL VIEW.3ADJUSTMEN

4、T.4PC BOARD.8SCHEMATIC DIAGRAM.12EXPLODED VIEW.17PARTS LIST.18SPECIFICATIONS.BACK COVERCAUTIONBe sure to adhere to the following, or properventilation will be blocked causing damageor fire hazard.Do not place any objects impairing heatradiation onto the top of the unit.Leave some space around the un

5、it (from thelargest outside dimension includingprojection) equal to or greater than, shownbelow.Back panel : 10 cmTop panel : 50 cmChannel space switching(except for the Europe and Australia)The space between radio channels has beenset to the one that prevails in the area to whichthe system is shipp

6、ed. However, if the curren channel space setting does not match thesetting in the area where the system is to beused, for instance when you move from area 1or area 2 shown in the following table or viceversa, proper reception of AM/FM broadcastscannot be expected. In this case, change thechannel spa

7、ce setting for each AM and FMbroadcast in accordance with your area byreferring to the following table.When the system is on, pressTUNER/bandbutton to select TUNER mode and wavebandof which you wish to set the channel space.Then, while pressing 6button, press 4button to switch the channel space.Area

8、U.S.A., Canada and South American countriesCHANNELSpace frequency12Other countriesFM: 100 kHzAM: 10 kHzFM: 50 kHzAM: 9 kHzCAUTIONPlace the unit where the AC power cord canbe easily unplugged.The power in this unit will not be completelycut off from the AC wall outlet when thepower completely, unplug

9、 the AC power cord from the AC wall outlet.The marking of products using lasersThe marking this product has been classified as Class 1. It means that there is no danger of hazardous radiationoutside the product.Location: BottomCLASS 1 LASER PRODUCTLASER KLASSE 1APPAREIL A LASER DE CLASSE 1LUOKAN 1 L

10、ASERLAITEKLASS 1 LASERAPPARATResetting 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

11、microcomputer andreturn the unit to its normal operating condition.Plug in the AC power cord to the wall outlet,and within 5 seconds, press and hold downthe 7button and press CD button.Please note that resetting the microcomputerwill clear the contents of the memory andreturn the unit to the state i

12、t was in when itleft the factory.Remote control unit (1)(A70-1690-08): E(A70-1691-08): MXAM loop antenna (1)(T90-0908-08)ANT TERMI CVR(F07-2029-08)Batteries (R6/AA) (2)AC plug adapter (1)(E03-0115-05)Use to adapt the plug on the power cord to the shape of the wall outlet.(Accessory only for regions

13、where use is necessary.)()RXD-M372CONTENTS / ACCESSORIES / CAUTIONSACCESSORIES CONTENTS CAUTIONSRXD-M373EXTERNAL VIEWRear cab.(A80-4503-08)Voltage selector *(S62-0124-08)Rubber foot(G11-2957-08)SYSTEMRECEIVERSPEAKERSHM-337-LRXD-M37-LLS-M37-LHM-337-SRXD-M37-SLS-M37-SSystem configuration*Refer to part

14、s list on page 18.RXD-M374ADJUSTMENTSERVICE ADJUSTMENT Lubrication The mechanical partsare factorycoated with a thin coat oflight greaseand should not require furtherlubrication. Ifa light greaseisapplied, be careful not to get anygrease on the play/recordhead orerase head, hubs,pulleys,tapesreels,

15、drive belts, orswitches. Use a good lubricant suchasSilicon Lube G322L orLubricate.Service Check Before aligning the mechanism,wipe offanyaccumulated dirt with denatured alcohol. Wipe around partswhere the tape contactsand around all rotating parts. Drive beltsare speciallyprocessed. Do not clean th

16、emwith alcohol. Mechanical TorqueUse a cassette type torque gauge and checkthe tape mechanism.Take-up torque 35 to 70 g-cmRewind torque 50 g-cmmin. Fastforward torque 50 g-cmmin. PinchWheel Pressure No adjustment to the pinch rollerspring isnecessary. It should be sufficient to give at least 40 g-cm

17、pull force.Tape Head Servicing Each time the unit isserviced, the faceofall headsshould be thoroughlycleaned with denatured alcohol orcommercial head cleaning solution. The playbackhead should be demagnetized with a commercial demagnetizer. Accumulation oftape oxide during normal operationscan cause

18、 problems,including lossofhigh frequenciesand wowand flutter. Erase Head The erase head isproperlyaligned when the tape ridesdirectlybetween the tape guide on the head without crinkling the tape. Play/Record and Playback Head Azimuth AdjustmentToadjustthe play/record and playbackhead azimuth screw:1

19、. Connecttwo (2)VTVMsand a dual trace scope to the stereo headphone jack(asshown)with a 32 ohmdummyload. (See Figure 1.)VTVMVTVMDUMMYLOADJK801SCOPECH1CH2Figure 1. Azimuth Adjustment RXD-M375ADJUSTMENT2. Insert a 10 kHztest tape (TeacMTT-1141V orEquivalent)into the tape mechanismand playit back.3. Wh

20、ile playing backthe test tape, slowlyturn the azimuth adjusting screwuntil the amplitude ofboth channel output waveformsismaximumand in phase. (See Figure2.) 4. Securethe azimuth screwin place with glue orpaint aftermaking the adjustment. Figure 2. Head Output Signal TapeSpeedAdjustment1. Set the fu

21、nction switch to TAPE. 2. Connect a frequencycounterwith a 32 ohmdummyload to the stereo headphone jack. (See Figure 3.)FREQUENCYCOUNTERDUMMYLOADJK801Figure 3. Tape Speed Adjustment 3. Insertand playbacka 3 kHztest tape (TeacMTT-111 orEquivalent)into the tape mechanism.4. Insert an insulated alignme

22、nt tool and adjust the tape speed potentiometer(MOTOR)until the frequencycounterindicates2940 Hzto 3090 Hz. Bias Oscillator Frequencyand Level Adjustment 1. Set the function switch to TAPE and the recordand playtape mechanismto RECORD. 2. Connecta VTVM and frequencycounterto test point R/P HEAD. 3.

23、Adjustbiasoscillator coil T360 until the frequencycounter indicates81 kHz0.5 kHz.4. Confirmthe recordhead voltage equal to: 6-12V. 5. Confirmthe erase head voltage equal to: 15-24V. RXD-M376ADJUSTMENTTUNER ALIGNMENTPROCEDURE Equipmentneeded:1. AM Signal generator2. FMSignal generator3. DC Voltage me

24、ter 4. Oscilloscope 5. Output meter (VTVM) AMAlignmentStep S/G FrequencyDialSettingIndicatorAdjustRemarks 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 testpoint Vt and ground T202

25、Adjust until Vt equal to 1.5 0.05V 3 1602 kHz(1kHz30% mod.) High end Sameasstep 2 ConfirmVt: 6.58.5V 4 612 kHz(1kHz30% mod.) 612 kHzSameasstep 1 T203 Maximumoutput 5 1404 kHz(1kHz30% mod.)1404 kHzSameasstep 1 VC201 Maximumoutput 6 Repeat steps4 and 5 to minimizetracking error7 999 kHz(1kHz30%mod.)99

26、9 kHzSameasstep 1 Offset islessthan 6 dB. 60 cmAMSIGNALGENERATORAMLOOPANTAMLOOPANTENNADUMMYLOADTEST UNITVTVMR-OUTL-OUTGNDFigure 4. AMIF/RF Tracking TESTUNITFigure 5.AMBand FrequencyCoverageAlignment GROUNDMETERVt DCRXD-M377ADJUSTMENTFMAlignment: Figure 6.FMBand FrequencyCoverageAlignment Connect FMS

27、/G to ANTinputs (mod 1 kHz 22.5kHz dev.) StepS/G FrequencyDial Setting IndicatorAdjust Remarks 1 87.5 MHzLowend Connect DC voltage meter to testpoint 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

28、 speakerjackL204 Adjust until Maximumoutput 4 106.1 MHz106.1 MHzSame asstep 3 VC202 Adjustuntil maximumoutput 5 Repeat steps3 and 4 to minimizetracking error.FMGENERATORDUMMYANTENNATP1TEST UNITOSCILLOSCOPEDUMMYLOADVTVMR-OUTL-OUTGNDFigure 7. FM Band/Tracking TESTUNITGROUNDMETERVt DCACEBD2 1357 46Refe

29、r to the schematic diagram for the value of resistors and capacitors.PC BOARD (Component side view)U101Q101D108Q106Q104LCD101CN107CN109CN104CN105D102D101Q103Q105CN108CN103D103CN101CN102DISPLAYCN110LED182LED181LED180SW107FRONT KEYD106Q182Q181Q180SW113SW102SW101CN112SW100SW108SW103SW110SW111SW106CN111

30、SW104SW109SW105SW112D105D104U102SW114SW115SW116SW117SW118CN113R143R144R145R101R104C104R100C108R107C116R142R140R141R139R137R138R136R6C118C107110050 5181803031C110R4R110R109R108R103C102C115R120 R121C113R119R118R117C112R115R125R1R149R113R112R148R123R124C111R3R128R129R130R131R132R133R134C119C105C016R2R8

31、R114C114R7R5J613J21R116R122J22J18R102J1J19J16J20J23J24J25J2J3J5R135J9R147J7X102X101C101C103J8C109J15J12J14J13R146L101J4R111J114011018185113 9 1 6 11EBBEBEECECR150R160R169R170R171R172R151R152R153R154R155R168R156R164R165R167R166 R159R163R162R157R158R161C118C117R180R181R182R186BEBEBEC183R185R173R183R18

32、8R184POWERRDS/DISPLAYC180TIME SETTIMER ON/OFFRECVOLUME UPTAPE11513IGO6VOLUME DOWNTUNER/BANDCDEQ/BASSREPEATPROG.PRESETDOWNPRESETUP61TOP KEY8FGIKMOHJLN2 1357 46Refer to the schematic diagram for the value of resistors and capacitors.PC BOARD (Component side view)109MAINHEADPHONEU601 Q801Q802Q805Q601Q2

33、03Q208Q202Q602U201Q206Q205 Q201Q204U250Q207U260Q263Q261Q260Q262Q250Q280Q252Q251Q316Q315Q305Q306Q301Q303Q302Q304Q317Q312Q308CN602Q313Q307Q310Q311Q309Q360CN806CN201FM ANTAM ANTVD204VD205CN801CN802D802Q803CN601D302Q281U301CN301CN302VD201CN260D301D303U802LCN803CN805ZD802CN804D803ZD801Q806Q804CN202U801JK

34、801D202VD203VD202D201D203D204RSPEAKERSZD901Q902D907D904D902D901D903D905CN901D906POWERFMVTAMVTC220C236C2C293J10LC209C210C211C212R213R214C215C216R211R212R247R248C247TP12111224131428 15R807C825C823R809R810C824C826R808C805R805R801R813R6R313R326R341R333R314R325R334R819R815C829C817C822 R812C322R802R806C80

35、6R814C248C205C273TP2C265R216R215C217R280C255TP6C253111 2010 1816 9R259R265TP1C224R1R209C213R227R233R204C233TP3R244L202TP4C202TP5C245C201C855C856C232R231C228 R293C229R229C227R203R202C222C223C219C204C231C230C239C203C234L20121C200C828C827R823 R824R210C214C237C226R236C208R811C821R217C218R208R219R221R234

36、R207R285R205R609C613R607R611R605C609C284R286R284R256C256C258C259R310R339R309R347R327R323C311 C312C305R328R348C326C310R321C626C331R343C624C628C629C622C618C614R608R612R606C610C616C612C608C606C604C602C282C632R624R622R344C332R804R803R322R610C621C617C615C611C607C605C603C281C601C631R623R621R320R312C350R31

37、6L302C320C302C301R311C319R315C324R304R336R337TP10TP9R822R818R817C333R335R330R331R346R338R332R340C316C360R302R318R317C323C366C364R360R301R303C308R306R307R308R319R305C307C309TP7C321L301TP11MGNDC365R364C362C363R365TP13TP8R220R206R201R200C221R223R239R218C294R235C271C270C269R270R269C267R268R267C268R271C2

38、61C260C274C264C262C287R2R242 C235C242R238C250R251R252C251R253R254C252R261C286R262C285R263R288R277R297C206R226EBEBEBEBEBEBEBEBEBEBEBEBEBEBEBEBEBEBE18169BEBEBEBE BEBEBEBEBEBEB EBEOG IBEBEBEBEBEBCEEBEB15L205CF201J915J31J22J26R613R600J36R830J34J33T3602J27115J30C820J39J35J32J401134R81619BE CECF202CF203C2

39、07R222R224J14R272J13R274R275R276J12J11J3J24R249R250J38J23R329J28R255R258C25713R243L806L807L808T203J4VC201C238T202GND2C240R246C272J2J1R266J6R225J8R281R279R273C290C254X2501C263OSC1GND16X260C266R257R283R232J150SC2R228J5L203R230J7L204BPF201L208T201VC202L801C813L802C812C809C803C818C623C619C625C620C804C81

40、0L809L810ICPR8211 4J16J17J20R354J29J25C304C315C303J19C314C325C317C313J21J18R355R324C830R820C831C329C327C627C832C801C833BEJ37C814C819C816C815112TIEC811C902C901R903R902R901CEC903C904C907C908F901RY901C905C906BLACKRED214RED1AC1AC2L901T901P2P111PRTQS2 1357 46PC BOARD (Component side view)Refer to the sch

41、ematic diagram for the value of resistors and capacitors.U703U701Q701Q703Q705Q702U702D701CN705CN702CN706CN703Q704CN704CD SERVOCN701D702C735J2J4R722R723R725R726R727C734C740J23161211311 01312241351803031 501008111630151162151C751C719X701C723J39C705C704C790C722J10J17 J15 J12 J11J7 J6C710J5J3C713R711C75

42、2L703L704J16J18J19J24C750L706J28J1R748J8J20J21J22J32J33J34J35J36J27R700R701R705R702R762R761R738R724R734R736C756R741C725C743C758C742R721C728R731R730C712C759C714R716R763EBR729R733R732C736C738C703C715C729C745C741C755C760C749R737R740C707R704R703C706R707C711C701C708R706C717C727C757J702R742C720GNDC718C733R717TE0FE0VREFC716C754J703R743J701R757R744R758R745R746R760R759R747R739R728RF0C744C753C732C739C737C709C726C730C731J704C702TE03C721C748R735C747C746J31C724J29J38CM-CHOKEJ26J30J25L705J13J14J9BEBEBE BE