JVC-CXJT8-cs-sm 维修电路原理图.pdf

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1、RadioFans.CN 收音机爱 好者资料库18CX-JT8SECTION 4TEST MODECOLD RESET The cold reset clears all data including preset data stored in theRAM to initial conditions. Execute this mode when returningthe set to the customer.Procedure:1.Press the POWER key to turn the power ON.2.Press three keys ofx, ENTER and POWE

2、R simultaneously.3.The message “RESET” is displayed on the fluorescent indicatortube momentarily, then becomes standby states.TUNER STEP CHANGE-OVER(Except AEP, UK and CIS models) A step of AM channels can be changed over between 9 kHz and10 kHz.Procedure:1.Press the POWER key to turn the power ON.2

3、.Press the TUNER BAND key to select “AM”.3.Press the POWER key to turn the power OFF.4.Press two keys of ENTER and POWER simultaneously.5.The message “9K STEP” or “10K STEP” is displayed on thefluorescent indicator tube, and thus the channel step is changedover.CD SHIP MODE This mode moves the optic

4、al pick-up to the position durable tovibration. Use this mode when returning the set to the customerafter repair.Procedure:1.Press the POWER key to turn the power ON.2.Press the CD key to select “CD”.3.Press two keys of CD and POWER simultaneously.4.The message “LOCK” is displayed on the fluorescent

5、 indicatortube, and the CD ship mode is set.CHANGE-OVER FUNCTION OF MD/VIDEO This mode is used to enable function of external input to changeover between MD and VIDEO.Procedure:1.Set to standby state.2.Press two keys of MD VIDEO and POWER simultaneously.3.The message “MD” or “VIDEO”is displayed on t

6、he fluorescentindicator tube, and the function of external input is changedover.CD TRAY LOCK MODE This mode is used to unable to take sample disc out of tray inthe shop.Procedure:1.Press the POWER key to turn the power ON.2.Press the CD key to select “CD”.3.While pressing thexkey, press theZkey for

7、5 seconds.4.The message “LOCKED” is displayed on the fluorescentindicator tube and the tray is locked. (Even if pressingtheZkey, the message “LOCKED” is displayed on thefluorescent indicator tube and the tray is locked)5.To release from this mode, while pressing thexkey, presstheZkey for 5 seconds.6

8、.The message “UNLOCKED” is displayed on the fluorescentindicator tube and the tray is unlocked.AMP TEST MODE This mode is used to set the parameter of AMP IC for adjustmentof tone quality and VACS level and display VACS status.Procedure:1.Press the POWER key to turn the power ON.2.Press three keys o

9、fx, HEAVY and HIP POP simultaneously.3.When the AMP test mode is activated, the message “AMPTEST” is displayed on the fluorescent indicator tubemomentarily.4.Press two keys of HEAVY and DISC DIRECT PLAY 2simultaneously, mode is changed over to parameter setting ofAMP IC and display of VACS status.5.

10、When the VACS ON, the message “V2255255” is displayed onthe fluorescent indicator tube, and when the VACS OFF, themessage “2255255” is displayed on the fluorescent indicatortube.6.Press the VOCAL key, DBFB ON/OFF is changed over.7.Press the ENTER key, surround ON/OFF is changed over.8.Press the MANU

11、AL key, EQ band is changed over to LOW,MID or HIGH.9.Press the HIP POP and TECHNO key, EQ curve adjustmentvalue is changed over between 8dB to +8dB.10. To release from this mode, press two keys of HEAVY andTECHNO simultaneously.)(RadioFans.CN 收音机爱 好者资料库19CX-JT8AGING MODE This mode can be used for op

12、eration check of CD section andtape deck section.CD section and tape deck section work in parallel.If an error occurred:The aging operation stops only an error occurred sections anddisplay then status.If no error occurs:The aging operation continues repeatedly.Procedure:1.Press the POWER key to turn

13、 the power ON.2.Press the CD key to select “CD”.3.Set disc on the tray and set tape into the deck.4.Set the “ALL DISCS” mode and “REV OFF” mode.5.Press three keys ofx, HEAVY and DISC CHANGE/DISC SKIPsimultaneously.6.The message “AGING” is displayed on the fluorescent indicatortube momentarily, then

14、aging operations of CD and tape arestarted at the same time.7.To release from this mode, operate the “COLD RESET”.1. Display at the Aging ModeDisplay operating state of CD section and tape deck sectionalternately.If an error occurred, stop display which that section.2. CD SectionThe sequence during

15、the aging mode is following as below.Display at the aging mode is the same as the normal operation.Aging mode sequence (CD section) :Start (from disc 1)Disc chuckingTOC readPlay first track for 2 secondsPlay last track for 2 secondsEX-change open/closeOpen the disc trayDisc skipClose the trayChange

16、the next disc.3. Tape Deck SectionThe sequence during the aging mode is following as below.If an error occurred, stop display that step.Aging mode sequence (tape deck section) :Rewind the tape A and B“AAG-1 or 2”Shut offFWD play the tape A“AAG-3”2 minutesFast forward the tape A“AAG-4”Shut off or 20

17、secondsREV play the tape A“AAG-5”2 minutesRewind the tape A“AAG-6”Shut offFWD play the tape B“BAG-3”2 minutesFast forward the tape B“BAG-4”Shut off or 20 secondsREV play the tape B“BAG-5”2 minutesRewind the tape B“BAG-6”Shut offNote: “*AG-*” is display of each step.20CX-JT8GC TEST MODE This mode is

18、used to check the fluorescent indicator tube, LEDand key.Procedure:1.Press the POWER key to turn the power ON.2.Press three keys ofx, HEAVY and DISC DIRECT PLAY 2simultaneously.3.Fluorescent indicator tube and LEDs are all turned ON.4.Press two keys of HEAVY and DISC DIRECT PLAY 2simultaneously, mod

19、e is changed over.5.In the key check mode, press each key, the defined key numberof every each key list is displayed on the fluorescent indicatortube.6.In the key count check mode, “K-CNT 0” is displayed on thefluorescent indicator tube. Each time a key is pressed, “K” valueincreases. However, once

20、a key is pressed, it is no longer takeninto account.7.In the headphone input check mode, connect the headphone,the message “H_P ON” is displayed on the fluorescent indicatortube, and disconnect the headphone, the message “H_P OFF”is displayed on the fluorescent indicator tube.8.In the volume check m

21、ode, turn the VOLUME knob, thedisplay on the fluorescent indicator tube is changed over to“VOL UP”, “VOL FLAT” or “VOL DOWN”MC TEST MODE This mode is used to check operations of Amplifier.Procedure:1.Press the POWER key to turn the power ON.2.Press three keys ofx, HEAVY and DISC DIRECT PLAY 3simulta

22、neously.3.When the MC test mode is activated, the message “MC MODE”is displayed on the fluorescent indicator tube momentarily, thenVACS level is displayed on the fluorescent indicator tube.4.Press the TECHNO key, the display on the fluorescentindicator tube is changed over to “EQ MAX”, press theMANU

23、AL key, the display on the fluorescent indicator tube ischanged over to “EQ MID”, press the HIP POP key, thedisplay on the fluorescent indicator tube is changed over to “EQMIN”,5.Turn the VOLUME knob, the display on the fluorescentindicator tube is changed over to “VOL MAX”, “VOL MID” or“VOL MIN”6.P

24、ress the ENTER key, VACS ON/OFF is changed over.7.When the REC PAUSE/START key is pressed with a tape setin the deck-B, the function is switched “MD” or “VIDEO” andrecording starts. When themorMkey is pressed duringrecording, the tape is rewound back to the beginning ofrecording, the function is swi

25、tched to “TAPE B”, then playbackstarts.8.When the CD SYNC key is pressed with the test tape (AMS-100, AMS-110A) in the deck, number of space between tunesis counted, then if AMS-110A is set, “OK” is displayed on thefluorescent indicator tube and if AMS-100 is set, “NG” isdisplayed on the fluorescent

26、 indicator tube.9.To release from this mode, press the POWER key.MODEL, DESTINATION AND VERSION DISPLAY This mode is used to check the model, destination and softwareversion.Procedure:1.Set to the standby state.2.Press three keys ofx, TECHNO and HEAVY simultaneously.3.When the model, destination and

27、 version display mode isactivated, the model an destination is displayed on thefluorescent indicator tube.4.Press two keys of HEAVY and DISC DIRECT PLAY 2simultaneously, mode is changed over to model and destinationdisplay mode and version display mode.5.In the version display mode, press the DISC D

28、IRECT PLAY 3key, display is changed over to version display and year, monthand day of the software creation display.6.To release from this mode, press the two keys of TECHNOand HEAVY simultaneously.CD ERROR CODE DISPLAY This mode can be used for error display of CD section.Procedure:1.Press the POWE

29、R key to turn the power ON.2.Press the CD key to select “CD”.3.Press three keys ofx, HEAVY and DISC DIRECT PLAY 1simultaneously.Note: Error code is not displayed on the liquid crystal display.CD SERVICE MODE This mode can run the CD sled motor freely. Use this mode, forinstance, when cleaning the op

30、tical pick-up.Procedure:1.Press the POWER key to turn the power ON.2.Press the CD key to select “CD”.3.Press three keys ofx, HEAVY andZsimultaneously.4.When the CD service mode is activated, the message “TRVSON” is displayed on the fluorescent indicator tube.5.Press theMkey, optical pick-up move to

31、outside track andthe message “SLED OUT” is displayed on the fluorescentindicator tube.6.Press themkey, optical pick-up move to inside track andthe message “SLED IN” is displayed on the fluorescent indicatortube.7.Press the TECHNO key, traverse ON/OFF is changed over.5 REPEAT LIMIT CANCEL Number of r

32、epeat for CD playback is 5 times when the repeatmode is “REPEAT”. This mode is used to enables CD to repeatplayback for limitless times.Procedure:1.Press the POWER key to turn the power ON.2.Press the CD key to select “CD”.3.Press three keys ofx, HEAVY andYsimultaneously.CX-JT82121CD SECTIONNote:1.C

33、D Block is basically designed to operate without adjustment. Therefore,check each item in order given.2.Use YEDS-18 (3-702-101-01) unless otherwise indicated.3.Use an oscilloscope with more than 10M impedance.4.Clean the object lens by an applicator with neutral detergent when thesignal level is low

34、 than specified value with the following checks.S-CURVE CHECKProcedure :1.Connect an oscilloscope to TP (FE) and TP (VC).2.Turn the power on.3.Load a disc (YEDS-18) and actuate the focus search. (Inconsequence of open and close the disc tray, actuate the focussearch)4.Confirm that the oscilloscope w

35、aveform (S-curve) issymmetrical between A and B. And confirm peak to peak levelwithin 3 0.5 Vp-p.Note: Try to measure several times to make sure than the ratioof A : B or B : A is more than 10 : 7. Take sweep time as long as possible and light up thebrightness to obtain best waveform.RF LEVEL CHECKP

36、rocedure :1.Connect an oscilloscope to TP (RF) and TP (VC).2.Turn the power on.3.Load a disc (YEDS-18) and playback.4.Confirm that oscilloscope waveform is clear and check if RFsignal level is correct or not.BD boardOscilloscopeTP(FE)TP(VC)symmetryS-curve waveformwithin 3 0.5Vp-pABTP(RF)BD boardosci

37、lloscopeTP(VC)Note:Clear RF signal waveform means that the shape “ ” can be clearlydistinguished at the center of the waveform.Connecting Location: BD boardRF signal waveformVOLT/DIV : 200mVTIME/DIV : 500nslevel : 1.3 0.3Vp-pTP (VC)TP (RF)TP (FE)IC721 BD Board (Conductor side) SECTION 5ELECTRICAL AD

38、JUSTMENTSCX-JT82222SECTION 6DIAGRAMS6-1.BLOCK DIAGRAM CD Section 87910807970 LIMIT SW20TDO1810VO3(+)FOIN20TIN3SPIN7LDS25SLIN17 VO3()11 VO2(+)12 VO2()26 VO4(+)27 VO4()2VO1(+)1VO1()ACBDEFLDPDRF AMP, FOCUS/TRACKING ERROR AMP,DIGITAL SIGNAL PROCESSOR, DIGIRAL SERVO PROCESSOR,DIGITAL FILTER, D/A CONVERTE

39、RIC72121FDO23SLDO22SPDO25CONT4ABDEFCI-V AMPDETECTORLDPDLASER DIODEOPTICAL PICK-UPBLOCK(KSM-213DCP)2-AXISDEVICE(FOCUS)(TRACKING)M702(SPINDLE)M701(SLED)MMFOCUS/TRACKING COIL DRIVE,SPINDLE/SLED MOTOR DRIVEIC7224948X70116.9344MHzS701(LIMIT)79 DATAIN80 DATACK5C2FIN1LRSY2ADDATA3ADBCK4ADLRCK7CKIN9CKOUT78 R

40、ESB99 I-LC78646/LC78684 DI98 O-LC78646/LC78684 DO100 O-LC78646/LC78684 CLK5O-LC78646 CE85 I-WRQ86 I-CD DRF4O-LC78646 RESET60DATA59DATACK52C2F58LRSY57ASDFIN56ASDACK55ASLRCK5416MOUT10676 6653EFLG50FSX/16MIN73 CMDOUT74 CMDINCEFSYNCO-LC78684 CEI-LC78684 SYNC75 CL26MP3RES64DO63DI62CL96I-CD NUMBER SENS22I

41、-BU IP DOWN/CD OPEN CLOSE9RINLM-R11RESET1O-SYS-MUTE94O-POWER RELAY29I-HOLDS-MUTEO-POWERHOLD61CE65*WRQ67DRF72CD MUTE66*RES4OUT12OUT2M751(LOADING)MLOADING MOTOR DRIVEIC701MP3 DECODERIC801SYSTEM CONTROLLERIC901 (1/2)S751OPEN/CLOSEDETECTOPENCLOSELEVEL SHIFTQ731TABLE ADDRESSSENSORIC731+ROTARYENCODERS7117

42、FINLM-F9RINTM-R4OUT12OUT2M741(TABLE)MTABLE MOTOR DRIVEIC7127FINTM-FLM-F, LM-R,TM-F, TM-RDS-MUTE,O-POWER, HOLDB42LCHO45RCHOR-CHCD-LAAPCFIN2FIN1LDDLDSTIN2TIN1XOUTXINRF4EFMIN3ERRORCORRECTEQ,AGCCOMMANDINTERFACECLOCKGENERATORPH, BHRF AMPTBALA/DCONVERTERD/ACONVERTEREXTERNALAUDIO INSERIAL OUTD/ACONVERTERSE

43、RVOPROCESSORAUTOMATICPOWER CONTROLQ70127I-POWER DOWNPOWER DOWNRESETRESET,POWER DOWNC SIGNAL PATH: CD PLAY R-ch is omitted due to same as L-ch.(Page 24)(Page 24)(Page 24)(Page 23)R-CHDISC TRAYADDRESS DETECTI/01 I/016A0 A8MDATA0 MDATA15MADRS0 MADRS827 OE45OEB13 WE42WEB14 RAS41RASB29 LCAS43CASLB28 UCAS

44、44CASUBIC802MEMORY2-5, 7-10,31-34, 36-3923-30, 33-4060-53, 5016-19, 22-26MUTINGQ311MUTING CONTROLSWITCHQ312CX-JT8232310CAPSTAN/REELMOTOR DRIVEQ60111PLUNGER DRIVE(DECK-A)Q602M MTAPE MECHANISMDECK BLOCK(CAPSTAN/REEL)(DECK-A)(DECK-B)LED DRIVER,TAPE MECHANISM CONTROLLERIC202MOTOR3DATA4CLOCK87 I-LC72121

45、DI92 O-LC72121/BU2099 CLK9O-LC72121 CE88 I-TUNER TUNE97 I-TUNER STEREO2I-BU1924 DI3I-BU1924 CLK21 I-MIC/I-TU SIG19 I-SPEANA M91 O-LC72121/M61529/BU2099 DO5LCK18 SOA-SOLGTAPE-L, REC-L(Page 24)KDI, SO, CLK, MCLK, LCK, (Page 24)JTUNER-L(Page 24)DLM-F, LM-R, TM-F, TM-R(Page 22)TUNER UNITAM LOOPFM ANTAM

46、ANTL-CHR-CHR-CHTU-MUTEDIDICLKCLKS-OUTLCKDIBIAS OSCL201REC BIASSWITCHQ228+9VBIAS OSCQ223ERASEHRPE1(REC/PB/ERASE)(DECK-B)HP1(PB)(DECK-A)L-CHR-CHR-CHR-CHL-CHR-CHR-CH18 I-SPEANA L20 I-SPEANA H76 I-HP MUTEBAND-PASSFILTERQ204 206KEY ACTIVESWITCHQ504, 50528 I-RMCREMOTE CONTROLRECEIVERIC802S301 309,S311 331

47、(FRONT PANEL KEY)83 I-VOL B84 I-VOL AROTARYENCODERS801SPEANA AMPQ201, 202B+ SWITCHQ921FL901FLUORESCENTINDICATOR TUBEMUTINGQ219, 22112PLUNGER DRIVE(DECK-B)Q603B-SOLLED213LED901A-PHOTOB-SOLA-SOLCAPM+B-PHOTOA-HALFB-HALFA-MODEB-MODEREC (FWD)REC (REW)9I-BASS+3.3VB+D603 610I-B-PHOTOI-B-HALFI-REC (FWD)S10/

48、I-REC (REW)S6 S10S1 S5,S11 S26G2 G11485249535055S7/I-A-PHOTO95O-KEYSCANS8/I-A-HALFU8U9U7S10/U11S7/U5S8/U6S9/I-B-MODE4754S6/I-A-MODES9/U10S6/U4U8U9U7U11U5U6U10U493O-POWER LED8O-BU2099 LCK41 45, 56 7131 40MIC, SASAMICEVOLUME79 I-BASS B80 I-BASS AROTARYENCODERS802TREBLEMIDDLE81 I-JOG B82 I-JOG AROTARYE

49、NCODERS803BASS77 I-TRE BI-KEY1 I-KEY378 I-TRE AROTARYENCODERS804MULTI JOG26 24SOMCLKLCKX90132.768kHz1312XT2XT17O-M61529 CLK1615X9028.64MHzCF2CF1i-BASSLED3038CD33LED3027CD22LED3016CD11POWER 1 STANDBY/ON(Page 24)HPF(Page 24)(AEP, UK)(Except AEP, UK, CIS)SYSTEM CONTROLLERIC901 (2/2) FM 75(COAXIAL)LED D

50、RIVERIC2013DATA4CLOCK5LCK18 SOLED2049TAPETAPE A/BLED20510HEAVYHEAVYLED20611VOCALVOCALLED20712SALSATECHNOLED20813TECHNOSALSALED21014HIP POPHIP POPLED21115MANUALMANUALLED2038AUXMD (VIDEO)LED2027TUNERTUNER BANDLED2016CDCDDISC DIRECT PLAYANTENNA3432BIN (L)AIN (L)2827EQOUT (L)26PB-OUT (L)TAI (L)MUTEDECK