Kenwood-MDXG-3-Service-Manual电路原理图.pdf

70%MD PERSONAL STEREO SYSTEMMDX-G3SERVICE MANUAL©2001-1/B51-5697-00 (K/K) 329APE T Dressing panel(A21-3897-03): L(A21-3926-03): SRArm(D10-3983-04)Handle(K01-0127-03): L(K01-0143-03): SRKnob ass'y(K29-7870-04): L(K29-7918-04): SRPanel ass'y (A60-1975-11): L(A60-1982-11): S(A60-1986-11): RIn compliance with Federal Regulations, following are repro-duction of labels on, or inside the product relating to laserproduct safety.KENWOOD-Crop. certifies this equipment conforms to DHHSRegulations No.21 CFR1040. 10, Chapter 1, subchapter J.DANGER : Laser radiation when open and interlock defeat-ed. AVOID DIRECT EXPOSURE TO BEAM.L:BLUE, S:SILVER, R:REDNote:Please contact KENWOOD service in your side ifyou want to get the AC power cord.Plastic cabinet ass'y (A02-2996-01)Miniature phone jack (E11-0399-05)Rod antenna (T90-0828-05)Miniature phone jack (E11-0399-05)AC inlet (E03-0374-05)POWER cord (1)(E30-2927-05)Remote control unit (1)Battery cover (A09-1151-08)(A70-1449-05)Batteries(R6/AA)for remote (2)AM loop antenna (1)(T90-0865-05)MDX-G32CONTENTS / ACCESSORIES / CAUTIONSCONTENTS / ACCESSORIES / CAUTIONS.2EXTERNAL VIEW.3DISASSEMBLY FOR REPAIR.4CIRCUIT DESCRIPTION.5ADJUSTMENT.10WIRING DIAGRAM.12PC BOARD.13SCHEMATIC DIAGRAM.16EXPLODED VIEW.29PARTS LIST.31SPECIFICATIONS.39ContentsAccessoriesOperation to resetThe microcomputer may fall into malfunction when a cord isunplugged and plugged again while the unit is ON or due to anexternal cause. In such a case, the microcomputer should be resetas described below:Unplug the power cord from the wall outlet and, while holding thePOWER key depressed, plug the power cord again. This initializesthe microcomputer. Note that this clears the previously storedmemory.Note related to transportation and move-mentBefore transporting or moving this unit, carry out the following oper-ations.1. Remove the CD or MD from the unit.2. Press the MD 6key.3. Wait for some time and verify that the display becomes asshown in the figure.4. Press the CD 6key.5. Wait for some time and verify that the display becomes asshown in the figure.6. Wait a few seconds and turn the unit off.Memory backup functionStored contents which are cleared immediately when power plug isunplugged from power outlet.- Clock display(Backed up for 3 min.)Stored contents which are cleared in at least a day after powerplug is unplugged from power outlet.¶¶Amplifier section- Input selection- Volume control value- AUX input level- Tone control levels- Timer setting contents¶¶Tuner section- Receiving band- Frequency- Preset stations- Auto tuning setting¶¶Cassette deck- Tape transport direction- Tape equalizer - Tape reverse mode¶¶MD recorder- Recording mode- Recording speedCautionsMDX-G33EXTERNAL VIEWCD/MDHIGHSPEEDDUBBINGSYSTEM1BITDUALD/ACONVERTERRod antenna(T90-0828-05)Top cover ass'y (A52-0920-21): L(A52-0922-21): S(A52-0924-21): RMDX-G34DISASSEMBLY FOR REPAIRSPCONNECTORX09 (G/7) -CN502X28-CN1111121122x3FRONTSIDE4333544FRONTSIDEFRONTSIDEFRONTSIDEx31. How to Remove Front Panel1. Remove 6 screws(1) from the rear side.2. Remove 2 screws(2) from the bottom side.3. Slide the front panel frontwards and pull out the connec-tors and FPC.4. Remove the front panel from the rear cabinet.2. How to Remove Top Panel1. Remove 3 screws(3) from rear side.2. Remove 3 screws(4) from top side.3. Remove 3 screws(5).4. Lift the top cover.Note: You need to pull out FPC on the rear side of top cover.MDX-G35CIRCUIT DESCRIPTION4. Microprocessor : MN101C49KLA(X09,IC11)4-1 Microprocessor Periphery Block Diagram 1. Initializing1-1 Initialization Method While pressing the POWER key, turn the AC on.1-2 Initialization Operation During the initial operation, the display shows “INITIAL-IZE “and after that it will be retuned to standby condi-tion. If any mechanisms error occurred, the error indicationis displayed as “ERR“ on the display.1-3 Mechanism Initialization1CD Mechanism If a mechanism error occurred, the error indication isdisplayed as “C ERR“ on the display.2Deck Mechanism If a mechanism error occurred, the error indication isdisplayed as “T ERR“ on the display.3MD Mechanism If a mechanism error occurred, the error indication isdisplayed as “M ERR“ on the display. The disc will be unloaded from MD mechanism auto-matically, if a disc is its in.P.CHBandFrequencyP.CHBandFrequency1FM98.30MHz16FM98.00MHz2FM87.50MHz17FM98.50MHz3FM108.00MHz18FM87.50MHz4FM89.10MHz19AM990kHz5FM90.00MHz20FM97.70MHz6FM87.50MHz21AM531kHz7FM87.50MHz22FM87.50MHz8FM87.50MHz23FM87.50MHz9AM1602kHz24FM87.50MHz10AM999kHz25FM87.50MHz11AM630kHz26FM87.50MHz12AM1440kHz27FM87.50MHz13FM106.0MHz28FM87.50MHz14AM531kHz29FM108.0MHz15FM87.50MHz30AM945kHzSetDestin-BandReceiving Channel IFRFationFrequecy RangeSpaceME1FM87.5MHz108.0MHz50kHz+10.7MHz25kHzME1AM531kHz1602kHz9kHz+450kHz9kHz2. Tuner Destination3. Tuner Preset FrequencyX28,IC1634551X09,ED501X09,IC12X09,IC21MN101C49KLAX09,IC22X09,IC32633322KEY1,2X09,A501X09,S517DECK MECHA.(ADR-2176TR3)DECK SYSTEM ICDOTDRIVER(M66004-001FPG)Vaccume FluorescentDisplay (HNA-16MM30T)ENCODERREMOTEKEYMD MECHA MDM-07SYSTEM IC(M61510FP)CD MECHA(KSM213CDM)PLLIC(LC72131)DSPIC(MN662748RPMFA)MDX-G36CIRCUIT DESCRIPTION4-2 Key MatrixInput Voltage Value : 4.6VInput Voltage(V)KEY2(Pin7)KEY1(Pin8)0.000.45POWERBEST HITS0.431.10SOUNDMD REC1.131.78AUXTAPE REC1.812.37SKIP DOWNTUNER2.412.80SKIP UPCD PLAY/PAUSE2.843.25STOPMD PLAY/PAUSE3.293.68MD EJECTTAPE PLAY3.724.22MENUSET/DEMO4.244.60KEY OFFKEY OFF4-3 Voltage Value of Control Port1Deck Reel PulseInput Voltage(V)Active0.001.94LOW1.952.91-2.924.6HIGH2Tuner Destination(Pin3)Input Voltage(V)Type0.002.50J(Japan)2.514.6M(Asia)3Voltage Protection(Pin4)Input Voltage(V)Protection0.002.50ON2.514.6OFF4CD Protection(Pin5)Input Voltage(V)Protection0.001.49ON1.503.49OFF3.504.6ONPort No.Port NameI/ODescriptionActiveHL1GNDConnected to ground.2PHOTOIDeck reel sensor input.3TYPEIDiscrimination of tuner destination.4PROTECTIONIDetection port for power supply protection.5CD PROTECTIDetection port for CD protection.6MD BACKVIDetection port for MD back up voltage.7,8KEY2,KEY1IA/D key (1,2) input.9KEY3Unused.10VREF+A/D reference voltage input for the A/D converter.11VDDPower supply input (+5V).12OSC2OMain clock output (8.38MHz).13OSC1IMain clock input (8.38MHz).14GNDConnected to ground.15XIITimer clock input (32kHz).16XOOTimer clock output (32kHz).17GNDConnected to ground18MD TXDOMD communication TX (to mecha. u-com RX).19MD RXDIMD communication RX (to mecha. u-com TX).20NC-Unused.21FL SDATAOData output to FL dot driver.22NC-Unused.23FL SCLKOClock output to FL dot driver.24FLRESETOReset output to FL dot driver.Reset25FL CEOCE output to FL dot driver.26REMIRemote control signal input.27MODEL TYPEIDiscrimination port for model type.Fixed28CD BLKCKISub code synchronous signal input.29RDSCLK-Unused.30,31ENC A,BIVolume encoder (A/B) input.32VDD2-Microcomputer power supply (+5v).33RESETIReset signal input for microcomputer.Reset34CEIBack up detection input.AC OnAC Off35OP/CL SWIInput port of detection switch for CD open/close.36SLTSWICD start switch input.37XRSTOCD DSP reset output.Reset3840NC-Unused.4-4 Port Description of MicroprocessorMDX-G37CIRCUIT DESCRIPTIONPort No.Port NameI/ODescriptionActiveHL41VPP-Microcomputer power supply (+5v).42MDATAOCD DSP command data output.43STATICD DSP status signal input.44MCLKOCD DSP command clock signal output.45MLDOCD DSP command load signal output.46SUBQICD sub code input.47SQCKOClock output for CD sub code.48EEP SDA-Unused.49EEP SCL-Unused.50HI SPEED-Unused.51OPEN-Unused.52CLOSE-Unused.53MD CEIDetection port for MD back up.54MD RSTIReset output from MD mechanism.55INI MD SWIUnused.56BACK CHK-Unused.57BACK ON-Unused.58MD IN SWILoad switch input for MD disc.59NC-Unused.60PLAY SWIDetection switch input of head position for deck.61CrO2 SW-Unused.62HALF SWICassette half switch input.63REC F SWIDeck forward recording switch input.OFFON64CPMOControl port of capstan motor for deck.65REC R SWIDeck reverse recording switch input.OFFON66SOLOControl port of solenoid for deck.67LMUTEODeck line mute control.ON68A/B-1ODeck recording mute & head select control 1.69A/B-2ODeck recording mute & head select control 2.70Bø/¿-Unused.71NOR-Unused.72BIASOControl port of bias on/off for deck.ONOFF73R/PODeck recording & playback changeover.RecordingPlayback74BEAT_COOn/off control port of beat cancel for deck.ONOFF75NCOUnused.76EVCLKOSound controller clock output.77EVDATAOSound controller data output.78ST-Unused.79,80NC-Unused.81LED STBY GRNOStandby led(green) control port.OFFON82LED STBY REDOStandby led(red) control port.OFFON83,84NC-Unused.85CD POWEROCD DSP power on/off changeover control.ONOFF86AMP ON/OFFOOn/off control port for amplifier circuit.87AMUTEOAudio mute output.88POWEROPower relay control.8992NC-Unused.93STIStereo detector input.94SDISD detector input.95GND-Connected to ground.96PLL DATAOPLL IC data output.97PLL CLKOPLL IC clock output.98PLL DOIPLL IC data input.99PLL CEOPLLIC chip enable output.100DAVDDID/A converter positive voltage.MDX-G38CIRCUIT DESCRIPTIONTEST MODESETTING METHODCD MODECD PLAY Key + AC-ONMD MODEMD PLAY Key + AC-ONDECK MODETAPE PLAY/REVERSE Key + AC-ONSUB CLOCK OSCSTOP Key + AC-ONDIAGNOSIS5. Test Mode5-1 Setting method of the Test ModeThe oscillation diagnosis(existence of oscillation and mea-surement of period) of a sub clock is performed before thetest mode is entered. If the diagnosis result is OK, the sys-tem enters the test mode.If the diagnosis result is NG, the oscillation of the sub clockis diagnosed again. If the result is OK, the system entersthe test mode. If the diagnosis result is continuously NG 5times, the system stops with “ERR1“and “ERR2“displayed.5-2 Cancel of the test mode By turning the AC off, the system is initialized and the testmode is canceled. Cancel the test mode only if the power switch is turnedoff.5-3 Contents of the Test Mode The muting during mode selection is not controlled in thetest mode. During the test mode, it can be operated in a special man-ner that is defferent from an ordinary operation by usingthe keys on the main body, specifically as shown in thenext page.KEYSDISPLAYOPERATIONCD-PLAY/PAUSE05 : (: ) Time DisplayTracking-servo on.(Cyclically changed the mode03 : 05 and 03 by pressing the key.)(: )Time DisplayTracking-servo off.CD STOP01 -:-Stop the CD operation.Adjustment value/mean value(Cyclically changed in the07 FG/FEFG value/FE valuestop mode only.)08 FB/FOFBAL value/FO value09 TG/TETG value/TE value10 TB/TOTBAL value/TO valueSKIP UPEx.0102Track No up.SKIP DOWNEx.0201Track No down.SKIP UPNormal Indication Play the first track No in the stop mode.SKIP DOWNNormal IndicationPlay the last track No in the stop mode.BEST HITSCD FF search.The pickup travels outward in the stop mode.SOUNDCD FB search.The pickup travels inward in the stop mode.KEYSDISPLAYOPERATION4 Seconds RecordingIf the REC/ARM key is pressed, the system record for 4 seconds.Then, it rewinds to the REC starting position and plays back automatically.TAPE RECTAPEIf the REC/ARM key is pressed, during the 4 seconds REC operation, the systemrecords further for 4 seconds, then returns to the starting position of the first 4 secondsREC operation and plays back.SOUNDBeat-C ONBeat cancel will be on while pressing the sound key.MENUNORMALChangeover the EQ. on/off cyclically.INDICATION5-5 Deck Test Mode 5-4 CD Test ModeMDX-G39CIRCUIT DESCRIPTIONKEYSDISPLAYOPERATIONBEST HITSNormal IndicationHi-speed O.T.E.(CDîMD) operation in the stop mode.FFMD FF search in the play mode.SOUNDDIGITAL or ANALOGThe digital and analog can be changed cyclically by pressing the “SOUND“ key.FBMD FB search in the play mode.STOP01 - : -Stop the MD operation.MD RECNormal IndicationStart the MD recording with LP4 mode.SETALL ERASEStop the MD operation and start operation of ALL- ERASE if disc is recordable.Mechanism half switches indication The mechanism half switches status are indicated “blank“ or “E “on the display.7th Dot(Display)1st figure2nd figure3rd figure4th figureMechanismFWD REC InhibitRVS REC InhibitCrO2(TYPE¿)Cassette HalfHalf SwitchDetection SWDetection SWDetection SWDetection SWONBlankBlankBlankBlankOFFEEEE5-6 MD Test ModeMDX-G310ADJUSTMENTNoITEMDemagneti-zation andcleaningAzimuth oftheREC/PLAYheadTAPE SPEED(NORMAL)BIASCURRENTINPUTSETTINGSCC-1727TCC153MTT11410kHz, 10dBTCC110MTT111SCC17273kHz(C)Connect theAG to jack.400Hz: -20dBs12.5kHz: -20dBsOUTPUTSETTING(B)(B)(B)DECKSETTINGDemagneti-zation:POWER OFFCleaning:PLAYPLAYPLAYREC andPLAYALIGNMENTPOINTRecordinghead, erasehead,capstanpinch rollerRVS FWDTrimming potin the motor.VR 1 (L)VR 2 (R)ALIGN FORDemagnetize the REC / PLAY head with the head eraser.Clean the REC/ PLAY head, erase head,capstan andpinch roller using a cotton swab slight-ly damped with alcohol.Adjust the output to maximum andadjust the azimuth adjustment screwfor the Lissajours waveform pattern ofthe oscilloscope to become close to a45°straight line.Fig.1Fig.1Check the tape speed so that3kHz(±2%) is obtained at the centerof the tape.Record 400Hz and 12.5kHz alternate-ly, and adjust the bias current adjust-ment potentiometer for the playbacklevels to become the same.FIG.ø. CASSETTE MECHANISM UNIT ¿. PC BOARD ADJUSTMENTCassette Deck adjustmentTuner adjustmentAMANTENNARFVCCN23(TAPE Rch),22 pinX28 CN1X09(E/7) P301(TAPE Lch),20 pin12LD+5VCN25 12(B)(A)(C)Fig.1FM-MPX-SGFM-MPX-SGPOLAR SGAC voltmeterAGDummy antennaOscilloscopeAC voltmeterFrequency counterNo.ITEMINPUTSETTINGSOUTPUTSETTINGSRECEIVERSETTINGSALIGNMENTPOINTSALIGN FORFIG.1TUNING LEVEL(A)98.0MHz MONO1kHz, ±75kHz dev.37.2dBf (ANT. input)(B)MONO98.0MHzVR301(X09)Adjust VR1and stop at thepoint where ED501(TUNED)Fig.1goes on.FM SECTION : SELECTOR : FM SYSTEM CONNECTIONS0dBs=0.775V