Kenwood-KRC-766-Service-Manual电路原理图.pdf

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1、 2002-12 PRINTED IN JAPANB53-0015-00 (N)2139AUTOAMEDOLBY B NRDABPanel assy(A64-2844-02): KRC-766Escutcheon(B07-3022-02)DOLBY B NRPanel assy(A64-2847-02): KRC-694/YEscutcheon(B07-3022-02)DC cord (ISO)(E30-4790-05): KRC-694/YDC cord(E30-4784-05): KRC-766Plastic cabinet assy(A02-1486-13)Lever(D10-4589-

2、04)x2Remote controller assy (RC-410)(A70-2025-05): KRC-766 onlyMounting hardware assy(J22-0011-03)Antenna adaptor(T90-0523-05): KRC-694/YScrew set(N99-1719-05): KRC-766 onlyScrew set(N99-1730-15)CASSETTE RECEIVERKRC-694/YKRC-766SERVICE MANUALThe CASSETTE MECHANISM OPERATION DESCRIPTION is the same m

3、odel D40-1122-05.Please refer to the service manual for model D40-1122-05 (B51-7452-00).KRC-694/YKRC-7662DISASSEMBLY FOR REPAIRHow to remove the Volume Knob1. Remove the rear cover of panel unit.2. Juck up as remove the switch unit (x16-) and Volume Knobas shown.(CAUTION)Volume Knob cannot pull of f

4、ront side that looked at tabpoint in the rotary encoder.LIGHTING BOARDCAPBe careful of direction.Rib: tallCAPKNOB(VOL)Dented partRib: shortHow to install the Volume Knob1. Remove the peeling paper of LIGHTING BOARD BOSS side.2. CAP and LIGHTING BOARD are install positioning as shown.5. Install a Vol

5、ume Knob in rotary encoder positioning as shown.KNOB(VOL)BROAD SIDEOTHER SIDEMount the Volume Knob into the broad Y shaped cutting in the direction of the picture.3. Remove the peeling paper.(Use Tweezers)4. CAP and Volume Knob are install positioning as shown.KRC-694/YKRC-7663BLOCK DIAGRAMTUNERCASS

6、ETTECHBUFFERRDSDECODERE-VOLMPX&BUFFERu-COMDOLBY EQMOTORMAINAVRSUB MOTORSUB MOTORDRIVERPANEL 5VEJECT ILLUMILCDEJECT SWPANEL DETROTARYENCODERKEY MATRIXLCD DRIVERWITHRESET SWREMOCONP CONANT CONPOWERSUPPLYICSW 5VRESETWIRED REMOACC DETSURGE DETB.U DETTEL MUTEBACK UPTEL MUTEACCSP OUTPOWERICDRIVERPROTECTTH

7、ERMALMUTEPRE MUTE PRE OUTIC2IC7IC9Q51Q53IC11IC8IC3IC6IC4IC1PLL-DATAPLL-CLKIFC OUTAUDIO OUTS-METERSW5VA8VAM+BSW5VR CLKRDATAS-METERQUALAFSQUALMP INLEVELTAPECHAMFMMODE2MODE3SUB-MOT +BSUB+MODE1FOR(L)FOR(R)REV(L)R REELF REELREV(R)MTL ON/OFFDOLBY ON/OFFMUTEMS OUTMS MODEF/RSW5VA8VBACK UPSUB-SUB+MOT +BLX RE

8、Q MBACK UPLX RSTLX MUTELX DATA SLX DATA MLX CONLX CLKLX REQ SBU5VI2C DATAI2C CLKPANELEJECT ILLEJECT REMOVOLUME BVOLUME ALDATALL CELDATASL CLKILLUMIBU5VA8VFM+BAM+BBU5VACC DETB.U DETPHONEEN1EN2EN3RSTBEEPP-MUTEMUTEBACK UPBU5VSW5V3600mV600mV1800mV1800mVK,M-TYPEFMCHAMTAPEMODE1372mV3600mV855mV1800mVE-TYPE

9、A8VDETKRC-694/YKRC-7664COMPONENTS DESCRIPTIONa71 SWITCH UNIT (X16-2020-11) Ref. No Purpose Function Operation/Condition/CompatibilityIC1 LCD driver Drives LCDIC2 Remote control IC Controls the unitQ1,Q4 REMO ON switch The power supply of IC2 is turned on when base level goes “L“Q2 Key Illumination s

10、witch (Green) Lights Green key-illumination when base level goes “H“Q3 Key Illumination switch (Red) Lights Red key-illumination when base level goes “H“a71 SYNTHESIZER UNIT (X14-918x-xx)Ref. No Purpose Function Operation/Condition/CompatibilityIC1 System -com Controls FM/AM tuner, the changer, cass

11、ette mechanism, Panel, volume and tone.IC2 E.Vol & N.C.MPX Controls the source, volume, tone and FM multiplex detector.IC3 Power supply IC BU5V(5V) Audio8V(8V) FM+B(8V)AM+B(8V) P-CON ANT-CONIC4 Power IC Amplifies the front L/R and the rear L/R to 50W or 47W maximum.IC6 Muting logic IC Controls logic

12、 for muting.IC7 RDS decoderIC8 Reset IC “L“ when detection voltage goes below 3.5V or less.IC9 Equalizer amplifier Dolby-B, Metal-EQ, Equalizer the Tape sound(120 sec).IC11 Sub motor driver Sub motor controlQ1 Serge detection “L“ when the back-up voltage becomes more than 18V(momentary power down).“

13、H“ when the back-up voltage becomes less than 18V.Q2 BACK-UP detection “L“ when B.U is present.“H“ when B.U is absent or momentary power down is detected.Q3 ACC detection “L“ when Acc is present.Q4 SW 5V ON when the base is “L“.Q5 Power-antenna detection “H“ when P-ANT output is short-circuit(P.ANT

14、OFF).“L“ when FM/AM signal does not exist.Q6 P-CON detection “H“ when P-CON output is short-circuit.Q51 Main motor switch 1 Outputs 14V when the base is “L“.Q52 Main motor switch 2 Q51 turns ON when the base is “H“ .Q53 Sub motor AVR Output 3.6V when the base of Q4 is “L“.Q54 MSTC switch ON when the

15、 base is “H“ .Q101 Composite signal bufferQ151 DSI driver DSI lights when the base is “L“.DSI turns off when the base is “H“ .DSI turns on and off when panel is taken off. Q152 Panel 5V switch When the panel is attached, the base goes “L“, turning the Tr ON to supply 5Vto the panel. When panel is ta

16、ken off, panel 5V cut off.Q201 Noise bufferQ350 Pre mute switch Drives the pre mute switch (Q351354) when the base is “L“.Q351 Pre mute switch Mutes the rear Lch when the base is “H“.Q352 Pre mute switch Mutes the rear Rch when the base is “H“.Q355 Pre mute switch Mutes the front Lch when the base i

17、s “H“.Q356 Pre mute switch Mutes the front Rch when the base is “H“.EN1 ILLUMI0V OFF5V ONIN OUTEN2 AM FM A8V0V OFF OFF OFF2.5V OFF ON ON5V ON OFF ONIN OUTEN3 ANT-CONP-CON0V OFF OFF2.5V OFF ON5V ON ONIN OUTIN SUB MOTORIN1() IN2(+)L L STOPLH CWH L CCWH H STANBYKRC-694/YKRC-7665MICROCOMPUTERS TERMINAL

18、DESCRIPTIONa71 SYSTEM MICROCOMPUTER MN101C49HNA (IC1: X14-)Pin No. Name Module I/O Description Processing Operation1 VREF- Power supply GND for A/D2 F REEL TAPE I Reel pulse FWD Cassette mecha reel pulse output FWD Vth=2.5V3 R REEL TAPE I Reel pulse REW Cassette mecha reel pulse output REW Vth=2.5V4

19、 S-METER TUNER I K3I tuner S-meter5 IFC-OUT TUNER I IF count 0V or 5V6 NOISE TUNER I FM noise detection terminal7 PHONE EXTRA I PHONE detection terminalTel mete :1V or less, NAVI MUTE:2.5V or less,Only J type 1V or less,more than 2.5V NAVI7 PHONE EXTRA I When Not used, output L fixed8 DCDET RESERVE

20、Power supply I Not used DE DET pull down DC offset detection terminal of P-IC9 GND Power supply GND10 VREF+ Power supply VCC for A/D11 VDD Power supply Microcomputers main Vcc12 MAIN OSC1 Main oscillation input 8.38MHz13 MAIN OSC2 Main oscillation input14 VSS Power supply Microcomputers main GND15 S

21、UB OSC1 32.768kHz oscillation input16 SUB OSC2 32.768kHz oscillation input17 GND Power supply GND External ROM18 LX-DATAM LX O Data output to CH Last maintain19 LX-DATAS LX I Data input from CH20 LX-CLK LX O Clock input and output with CH21 FLASH READ O22 FLASH WRITE O23 FLASH CLK O24 BEEP AUDIO O B

22、eep for built in amplifier25 PANEL-DET to PANEL I Panel existence detection terminal Detached the panel :L, Attached the panel :H26 REMO to PANEL I Remote control input27 R-CLK TUNER I Clock for RDS decoder With no destination:out put L fixing27 NC O With no RDS output L fixed28 LX-REQS LX I Request

23、 input from CH Request detection :L29 B.U-DET Power supply I Momentary power down detection BU detection :L With no BU :H30 EJECT to PANEL I Tape eject L :KEY input31 KEY-REQ to PANEL I Communication request from LCD driver L :KEY input32 VDD Power supply I VDD33 RESET I ResetDuring tape play :L34 E

24、Q MUTE TAPE O Equalizer mute During tape FF/REW :HMode except tape :H35 DOLBY TAPE O B NR ON/OFFB NR ON:H, B NR OFF:LMode except tape :keep the value36 MUSIC TAPE I Tape between music detection music signal detection:L, with no music signal:H37 NC O38 NC O39 NC O40 NC O41 VDD Power supply I VDD42 L

25、DATAS to PANEL O TXD for LCD43 L DATAL to PANEL I RXD for LCD44 L CLK to PANEL O Clock for LCD45 PLL DATA TUNER I/O Tuner I2C SDA46 NC OKRC-694/YKRC-7666MICROCOMPUTERS TERMINAL DESCRIPTIONPin No. Name Module I/O Description Processing Operation47 PLL CLK TUNER I/O Tuner I2C SCL48 NC O49 NC O50 NC O5

26、1 PANEL 5V to PANEL I/O Panel 5V ON/OFF Attached the panel, ACC ON :L (Refer to “Truth table 5“)52 NC O53 NC O54 VOL A to PANEL I Rotary encorder input Refer to timing chart55 VOL B to PANEL I Rotary encorder input Refer to timing chart56 DSI to PANEL O Eject key illumination, guide illumination, DS

27、I control Light on :L, Light off :H57 NC O58 FILP-DET to PANEL I 14seg retractable detection59 L CE to PANEL O LCD driver CE60 NC O61 TYPE0 EXTRA I Destination setting Refer to “Trush table 4“62 TYPE1 EXTRA I Destination setting Refer to “Trush table 4“63 TYPE2 EXTRA I Destination setting Refer to “

28、Trush table 4“64 NC O65 ST TYPE0 EXTRA I for OEM Refer to “Trush table 4“66 ST TYPE1 EXTRA I for OEM Refer to “Trush table 4“67 NC O68 NC O69 NC O70 MODE1 TAPE I Cassette mechanism mode detection Refer to “Trush table 1“71 MODE2 TAPE I Cassette mechanism mode detection Refer to “Trush table 1“72 MOD

29、E3 TAPE I Cassette mechanism mode detection Refer to “Trush table 1“73 MOTOR TAPE O Cassette mechanism main motor Motor active :H, Motor stop :L74 SUB+ TAPE O Cassette mechanism sub motor Refer to “Trush table 2“75 SUB- TAPE O Cassette mechanism sub motor Refer to “Trush table 2“76 R QUAL TUNER I RD

30、S quality76 NC O When with no RDS, output L fixed77 R DATA TUNER I RDS data77 NC O When with no RDS, output L fixed78 LX-MUTE LX I Mute request from CH H:MUTE ON L:MUTE OFF79 LX-CON LX O Control output to CH ON:H OFF:L80 LX-REQM LX O Request output to CH Request detection :L81 LX-RST LX O Reset for

31、CH Usually, L after system RST returned, after more than 400msec H, and L82 MUTE AUDIO O Mute83 AFS TUNER O Noise detection time constant switching terminal FM seek during AF search :L, during receiving :H84 IC2 SDA AUDIO I/O SDA for EVOL85 IC2 SCL AUDIO I/O SCL for EVOL86 P-MUTE AUDIO O Power IC Mu

32、te output terminal When power off :L all off :L tel mute :L87 P-STBY AUDIO O Power IC standby output terminal When power IC on :H off :L 88 SVR AUDIO O Power IC servo control terminal momentary power down :H 89 ACC-DET Power supply I ACC detection ACC detection :L with no ACC :H90 PCON-DET EXTRA I P

33、CON output detection PCON detection :L 91 PANT-DET EXTRA I PANT output detectionPANT detection :L with no PANT :output L fixed92 MS MODE TAPE O Tape between music detection switchingWhile tape play :HWhile tape FF/REW, mode except tape :LKRC-694/YKRC-7667MICROCOMPUTERS TERMINAL DESCRIPTIONPin No. Na

34、me Module I/O Description Processing OperationFWD input :L93 F/R TAPE O Tape EQ input switching REV input :H MODE except TAPE :keep the value94 METAL TAPE O TAPE METAL ON/OFFNORMAL :H, METAL :LMODE except TAPE :keep the value95 DAVSS Power supply96 EN2 Power supply O Power supply IC control Refer to

35、 “Trush table 3“97 EN3 Power supply O Power supply IC control Refer to “Trush table 3“98 EN1 Power supply O Power supply IC control Refer to “Trush table 3“99 SW5V Power supply O SW5V control100 DAVDD Power supply Reference power supply for D/AMODE1 MODE2 MODE3 conditionL H H EjectH L H StandbyL L L

36、 REWLL FH L L REV playH H L FWD playH H H other positionTrush table 1. (Cassette mechanism conditions)SUB MOTOR + SUB MOTOR - conditionL L Stop (Power off)L H Normal rotation (way to loading)H L Reverse (way to eject)H H Stop (Power on)Trush table 2. (Cassette mechanism sub motor)EN1 ILLL OFFHONTrus

37、h table 3. (Power supply IC TDA3682)EN1 ControlModel number TYPE0 TYPE1 TYPE2 ST TYPE0 ST TYPE1KRC-766 L LLLLKRC-694/Y L L H L LKRC-666R L H L L LKRC-594/Y L H H L LKRC-594V/YV H LLLLKRC-666 H H L L LTrush table 4. (Destination type list)Processing intructions for low consumption modePOWER OFF O LAC

38、C OFF I Hi-zDetached the panel I Hi-zMomentary power downI Hi-z(Attached the panel)Trush table 5. (Panel 5V)EN2 AUDIO 8V AM 8V FM 8VL OFF OFF OFFM ON OFF ONH ON ON OFFEN2 ControlEN3 P-ANT P-CONL OFF OFFM OFF ONHONONEN3 Control*H=5V M=2.5V L=0VKRC-694/YKRC-7668TEST MODE1. How to enter the test mode W

39、hile holding the Preset 1 and Preset 3 keys, reset the unit.2. How to exit from the test mode Reset the unit, momentary power down, ACC OFF, power OFF, and Panel detached. (Note) The test mode cannot terminated by Panel is falldown.3. Initial status in the test mode Sources : All OFF. Display : All

40、segments are lit. Volume : -10 dB (displayed as 30) Loudness : OFFCRSC : OFF regardless of the presence of switching function. SYSTEM Q : Flat. BEEP : When pressing any keys, the buzzergenerates a beep at any time. DISPLAY TYPE : TYPE A4. RDS automatic measurement An addition to disposal of substitu

41、te for visual check PSdisplay as usual production lines. P-CON terminal is OFF by force, when received the PSdata and in case of corrobaration PS display is “RDS_TEST“.(“_” is mean blank.) This disposal is test mode only. P-CON is switching the source or return with power on a161 off.5. Special disp

42、lay in Tuner modeWhen any of the following messages is displayed in Tunermode, the front end may be abnormal. “TNE 2P NG“: The EEPROM is set to the default (unsta-ble values) because the F/E was shipped without passingthrough the adjustment process, etc. “TNCON NG“: Communication with the F/E is not

43、 possible.6. Forced switching of K3IEach press of the Preset 6 key in Tuner mode shouldswitch K3I from AUTO a161 Forced Wide a161 Forced Middlea161 Forced Narrow a161 AUTO. The initial status is AUTOand the display shows these modes as follows. AUTO : FMA Forced Wide : FMW Forced Middle : FMM Forced

44、 Narrow : FMN7. Test mode specifications of the cassette receiverBLANK SKIPP :OFF8. Audio-related specifications A short press of the Q key initiates the audio adjustmentmode.Pressing the key on the remote initiates the audioadjustment mode. Fader is selected to the initial item. Continuous holding

45、of a remote control key is inhibited. Bass, Middle and Treble are adjusted in 3 steps of -8/0/+8 with the Track Up/Down keys. Balance is adjusted in 3 steps of L15/0/R15 with the Track Up/Down keys. Fader is adjusted in 3 steps of F15/0/R15 with the TrackUp/Down keys. Volume Offset is adjusted in 2

46、steps of -8/0 with theTrackUp/Down keys.9. Menu-related specifications A short press of the MENU key initiates the Menu mode.Except, tape source is usually press and hold 1 second to enter the menu mode and short press initiates turn over. Pressing the DNPP/SBF key on the remote initiates theMenu mo

47、de. Continuous holding of a remote control key is inhibited. Contrast is adjusted in 3 steps of 0/5/10(5x7dot), 0/4/7 (14seg) with the Track Up/Down keys.10. Backup current measurement When the unit is reset while ACC is OFF (i.e. by turningBack-Up ON), the MUTE terminal goes OFF in 2 secondsin plac

48、e of 15 second.KRC-694/YKRC-7669TEST MODE11. Special display when the display is All ONPressing the Preset keys while the power is All OFFdisplays the following information.14seg 8 digits15x7dot 12 digits12. Other specifications The line mute against times are 1 second from 10 secondswhen starting t

49、he test mode.a73 Security Forced Power ON mode (All models)Even when the security is approved, resetting the unitwhile holding the Q and 4 keys makes it possible to turnthe power ON for 30 minutes.After 30 minutes haveelapsed, it is not possible to return to the previous con-dition unless the unit is reset again. Method of registration of the security code afterEEPROM (F/E) replacement (Code security model)1. Enter the test mode. (See How to enter the test mode)