JVC-MXJ170V-cs-sm 维修电路原理图.pdf

《JVC-MXJ170V-cs-sm 维修电路原理图.pdf》由会员分享，可在线阅读，更多相关《JVC-MXJ170V-cs-sm 维修电路原理图.pdf（78页珍藏版）》请在收音机爱好者资料库上搜索。

1、SERVICE MANUALCOMPACT COMPONENT SYSTEMNo.20859Nov. 2000COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.MX-J170VArea SuffixUSUSingaporeOther AreasSafety precautionsImportant for laser productsPreventing static electricityDisassembly methodAdjustment method1-21-31-41-51-21Flow of functional operation unti

2、l TOC readMaintenance of laser pickupReplacement of laser pickupDescription of major ICs 1-251-261-261-27ContentsOPEN / CLOSESTANDBYDISC CHANGEVOLUMEPLAYREC/PLAYCD SYNCHRO RECORDINGEJECTEJECTPROGRAM/SETCOUNTERRESETACTIVE BASS EX.SOUNDMODECLOCK/TIMERNTSC/PALAUXFM/AM- VCD NUMBER PRESETVCD NUMBER +CDTA

3、PETAPE A/BCD RECSTARTA BDUBBINGREC/PAUSECD1CD2CD3+PLAY & EXCHANGERMIC LEVELDEMOPHONESFULL-LOGIC CONTROLMINMAXMICNTSC/PAL COMPATIBILITYCOMPACTDIGITAL VIDEOVIDEO CDSELECTPREVNEXTKEYCONTROLECHOMPX/V.REPLACE/V.MASKINGCDSLEEPTIMERON/OFFDECK A/BTUNING MODE FM MODEVOLUMEPREV+RMSMXJ170V REMOTE CONTROLTAPEDI

4、SC SKIPFM/AMAUXCDFADE MUTINGSELECTNEXTVOLUME+VCDNUMBERKEY CONTROLPBC(MENU)NTSC/PALSLOW SINGLE STEPV. MASKINGECHOREPEATPROGRAM/SETBASSSOUND MODE07VIDEO CDPlayBackControlMX-J170VRadioFans.CN 收音机爱 好者资料库MX-J170V1-2Safety Precautions1. This design of this product contains special hardware and many circui

5、ts and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personne

6、l only.2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturers warranty and will further relieve the manufacture of responsibility for personal injury or pro

7、perty damage resulting therefrom.3. Many electrical and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rat

8、ed for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The us

9、e of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the l

10、ike to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, afte

11、r re-assembling.5. Leakage current check (Electrical shock hazard testing)After re-assembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product i

12、s safe to operate without danger of electrical shock.Do not use a line isolation transformer during this check.Plug the AC line cord directly into the AC outlet. Using a Leakage Current Tester, measure the leakage current from each exposed metal parts of the cabinet , particularly any exposed metal

13、part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.)Alternate check methodPlug the AC line cord directly into the AC outlet. Use an AC voltmeter having 1,000 ohms per volt or more sensitivity in the following manner. Connect a

14、1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground.Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path

15、to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). Warning1. This equipment has been designed and manufactured to meet int

16、ernational safety standards.2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.3. Repairs must be made in accordance with the relevant safety standards.4. It is essential that safety critical components are replaced by approved parts.5. If mains vo

17、ltage selector is provided, check setting for local voltage.Good earth groundPlace this probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE!CAUTIONBurrs formed during molding may be left over on some parts of the chassis. Therefore, pay atte

18、ntion to such burrs in the case of preforming repair of this system.RadioFans.CN 收音机爱 好者资料库MX-J170V1-3Important for laser products1.CLASS 1 LASER PRODUCT2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.3.CAUTION : There are no serviceabl

19、e parts inside theLaser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.4.CAUTION : The compact disc player uses invisible laserradiation and is equipped with safety switches whichprevent emission of radiation when the drawer is open and the safety interlo

20、cks have failed or are de feated. It is dangerous to defeat the safety switches.5.CAUTION : If safety switches malfunction, the laser is able to function.6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure

21、.VARNING : Osynlig laserstrlning r denna del r ppnad och sprren r urkopplad. Betrakta ej strlen.VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina nkymttmlle lasersteilylle.l katso steeseen.ADVARSEL : Usynlig laserstrling ved bning , nr sikkerhedsafbrydere er ude af funktion. Undg udsttels

22、e for strling.ADVARSEL : Usynlig laserstrling ved pning,nr sikkerhetsbryteren er avslott. unng utsettelse for strling.REPRODUCTION AND POSITION OF LABELSWARNING LABELDANGER : Invisibie laser radiation when open and interlock or defeated.AVOID DIRECT EXPOSURE TO BEAM (e)VARNING : Osynlig laserstrlnin

23、g r denna del r ppnad och sprren r urkopplad. Betrakta ej strlen. (s)VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina nkymttmlle lasersteilylle.l katso steeseen. (d)ADVARSEL :Usynlig laserstrling ved bning , nr sikkerhedsafbrydere er ude af funktion. Undg udsttelse for strling. (f)CLASS

24、1LASER PRODUCT!CAUTIONPlease use enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.MX-J170V1-4Preventing static electricity1. Grounding to prevent damage by static electricity Electrostatic discharge (ESD), which occurs when static electricity stored

25、in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.2. About the earth processing for the destruction prevention by static electricity In the equipment which uses optical pick-up (laser diode),

26、optical pick-up is destroyed by the static electricity of the work environment.Be careful to use proper grounding in the area where repairs are being performed. 2-1 Ground the workbench Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before pl

27、acing the traverse unit (optical pickup) on it.2-2 Ground yourself Use an anti-static wrist strap to release any static electricity built up in your body. 3. Handling the optical pickup1. In order to maintain quality during transport and before installation, both sides of the laser diode on the repl

28、acement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)2. Do not use a tester to check the condition of the laser diode in the optical pickup. The testers internal power source can easily destroy the laser diode. 4. Handling t

29、he traverse unit (optical pickup)1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. 2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the replacement procedu

30、re in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector. 3. Handle the flexible cable carefully as it may break when subjected to strong force. 4. It is not possible to adjust the semi-fixed resistor that

31、adjusts the laser power. Do not turn itConductive material (conductive sheet) or iron plate(caption)Anti-static wrist strapAttention when CD mechanism assembly is decomposed1. Remove the CD changer unit. 2. Remove the CD changer mechanism. 3. Solder is put up before the card wire is removed from the

32、 pickup unit connector on the CD mechanism assembly. (When the card wire is removed without putting up solder, the CD pick-up assembly might destroy.) 4. Please remove solder after connecting the card wire with the pickup unit connector when you install picking up in the substrate.*Please refer to D

33、isassembly method in the text for pick-up and how to detach the CD mechanism assembly. SolderingFig.1Fig.2Card wireCard wirePickup unitconnectorPickup unitconnectorCD changer unitCD mechanismMX-J170V1-5Remove the five screws A on the back of the body and the both sides of the body. Remove the top co

34、ver upward from behind.Remove the eight screws B attaching the side covers on the back of the body and the both side of the body.Slide the right and left covers backward and unhook the two hooks a in the lower part of the side covers as shown in Fig.2-2. 1.2.3.4.Removing the top cover and the side c

35、overs (See Fig.1 to 3) Disassembly methodFig.1Fig.2Fig.2-2Fig.3Top coverAAABBSide cover (L)Side cover (R)Side cover (R)ABBBTop coverHooks aTop coverHooks aABBBSide cover (L)HookHookMX-J170V1-6Prior to performing the following procedure, remove the top cover and the side covers.Press the POWER button

36、. Press the OPEN/CLOSE button to eject the CD tray. Move the CD tray fitting upward and release the joint b.Press the OPEN/CLOSE button to insert the CD tray.1.2.3.Removing the CD Tray fitting(See Fig. 4 to 6) Be sure to remove the CD tray fitting before removing the CD changer unit. ATTENTION: Fig.

37、4Fig.5Fig.6POWER buttonOPEN/CLOSE buttonCD trayJoint bJoint bCD tray fittingCD trayMX-J170V1-7Prior to performing the following procedure, remove the top cover and the side covers.Disconnect the harness from connector PCON1 of the VCD board. Remove the four screws W attaching the sealed and VCD boar

38、d.Turn the black loading pulley gear marked c from the back of the CD changer unit as shown in Fig.8 and draw the CD tray toward the front.Move the CD tray fitting upward and release the joint b.Push and insert the CD tray manually.1.2.3.4.5.Removing the CD Tray fitting & the VCD board (See Fig.7 to

39、 10) Be sure to remove the CD tray fitting before removing the CD changer unit. ATTENTION: - How to eject the CD tray without turning on power -Fig.9Fig.10Joint bJoint bCD tray fittingCD trayFig.7Fig.8WVCD boardSealedPCON1Marked cLoading pulley gearMX-J170V1-8Prior to performing the following proced

40、ure, remove the top cover, the side covers and the CD Tray fitting.Disconnect the card wire from connector SCW1 of the CD servo board on the back of the CD changer unit.Disconnect the harness from connector FW2 on the inner side of the main board in the body.Disconnect the harness from connector VCW

41、2 on the VDC power board .Remove the two screws C attaching the CD changer unit on the back of the body. Draw the CD changer unit upward from behind while pulling the rear panel outward. 1.2.3.4.5.Removing the CD changer unit (See Fig.11 to 13)Fig.11Fig.12Fig.13SCW1CD servo boardCD changer unitMain

42、boardFW2Rear panelCRear panelFront panel assemblyCD changer unitVCW2VCD power boardVCD power boardMX-J170V1-9Prior to performing the following procedure, remove the top cover, the side covers, the CD Tray fitting and the CD changer unit.There is no need to remove the rear panel. Disconnect the harne

43、ss from head wire connector ECW1,DW1 and DW2 on the inner side of the main board in the body.Disconnect the harness from connector HCW1 of the headphone board on the right side of the body. Remove the three screws D attaching the front panel assembly on both sides of the body.Remove the screw E atta

44、ching the earth terminal extending from the front compartment. Remove the screw F attaching the front panel assembly on the bottom of the body.Release the two joints d on both sides and two joints e on the bottom of the body using a screwdriver. At the same time, disconnect the front compartment fro

45、m connector CCW1 and CCW2 of the main board. 1.2.3.4.5.Removing the front panel assembly (See Fig.14 to 16)Fig.14Fig.15Fig.16Main boardDW2DW1CCW1CCW2Front panel assemblyJoint dearth wireDEFront panel assemblyDDMain boardMIC/Headphone boardHCW1FJoint eJoint eJoint dECW1MX-J170V1-10Prior to performing

46、 the following procedure, remove the top cover, the side covers, the CD Tray fitting and the CD changer unit.There is no need to remove the front panel assembly. Remove the ten screws G attaching the main board, the tuner board and the heat sink to the rear panel on the back of the body.Remove the t

47、hree screws H attaching the VCD power board to the rear panel on the back of the body. Remove the four screws I attaching the rear panel on the back of the body. 1.2.3.Removing the rear panel (See Fig.17)Prior to performing the following procedure, remove the rear panel.Disconnect the harness from c

48、onnector HCW1 of the MIC/headphone board on the right side of the body. Release the harness from the clamp in the body. Disconnect the harness from head wire connector ECW1,DW1 and DW2 extending to the main board in the body. Disconnect the harness from connector RCW1 of the power transformer.Remove

49、 the screws D attaching the front panel assembly on both sides of the body.Remove the screw J attaching the earth terminal to the base chassis.Disconnect connector CCW1 and CCW2 connected to the main board. 1.2.3.4.5.6.Removing the main board(See Fig.18 and 19) Fig.17Fig.18Fig.19GRear panelGGIHFront

50、 panel assemblyMain boardMIC/headphone boardHCW1Main boardHeat sinkTuner boardDW2DW1CCW2CCW1Power transformerRCW1JClampGECW1DVCD boardMX-J170V1-11Prior to performing the following procedure, remove the main board.Disconnect the harness from connector MJW1 of the main board.Remove the three screws K