Jvc-NXMD-1-R-Service-Manual电路原理图.pdf

《Jvc-NXMD-1-R-Service-Manual电路原理图.pdf》由会员分享，可在线阅读，更多相关《Jvc-NXMD-1-R-Service-Manual电路原理图.pdf（69页珍藏版）》请在收音机爱好者资料库上搜索。

1、COMPACT COMPONENT MD SYSTEMNX-MD1R / NX-MD1NX-MD1R/NX-MD1No.21041Oct. 2001COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.ContentsSafety precautionsPreventing static electricityImportant for laser productsDisassembly methodAdjustment method (CD/MD section)Flow of functional operation until TOC read (CD)

2、Flow of functional operation until TOC read (MD)Maintenance of laser pickup (CD)Replacement of laser pickup (CD)Maintenance of laser pickup(MD)Replacement of laser pickup(MD)Description of major ICs1-21-31-51-61-321-371-381-391-391-401-401-4168SERVICE MANUALCA-NXMD1R/CA-NXMD1 SP-NXMD1SP-NXMD1Area su

3、ffix NX-MD1A - AustraliaUS - SingaporeUB - Hong KongUP - KoreaArea suffix NX-MD1RB - U.K.E - Continental EuropeEN - Northern EuropeNX-MD1R/NX-MD11-21. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no ch

4、anges 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 personnel only.2. Alterations of the design or circuitry of the product should not be ma

5、de. 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 property damage resulting therefrom.3. Many electrical and mechanical parts in the

6、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 rated for higher voltage, wattage, etc. Replacement parts which have these special

7、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 use of a substitute replacement which does not have the same safety characteristic

8、s 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 like to be separated from live parts, high temperature parts, moving parts and/or

9、 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, after re-assembling.5. Leakage currnet check (Electrical shock hazard testing)After

10、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 is safe to operate without danger of electrical shock.Do not use a line isolation

11、 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 part having a return path to the chassis, to a known good earth ground. Any lea

12、kage 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 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an expose

13、d 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 to the chassis, and meausre the AC voltage across the resistor. Now, reverse

14、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.). 1. This equipment has been designed and manufactured to meet international safety standards.2. It is the legal responsibility of the repairer to ens

15、ure 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 voltage selector is provided, check setting for local voltage.Good earth groundPlace t

16、his probe on each exposedmetal part.AC VOLTMETER(Having 1000 ohms/volts,or more sensitivity)1500 10W0.15 F AC TYPE!Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.In regard with componen

17、t parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the “ “ mark nearby are critical for safety. When replacing them, be sure to use the parts of the same type

18、and rating as specified by the manufacturer. (Except the J and C version)NX-MD1R/NX-MD11-3Preventing static electricity1. Grounding to prevent damage by static electricityElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy t

19、he 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 Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players. B

20、e careful to use proper grounding in the area where repairs are being performed. 2-1 Ground the workbenchGround the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.2-2 Ground yourselfUse an anti-sta

21、tic 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 replacement optical pickup are shorted. After replacement, return the shorted parts to

22、 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 the traverse unit (optical pickup)1. Do not subject the traverse unit (optical pick

23、up) to strong shocks, as it is a sensitive, complex unit. 2. Remove solder of the shorting round on the flexible wire after replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not

24、to take too long a time when attaching it to the connector. 3. Handle the flexible wire carefully as it may break when subjected to strong force. 4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn itConductive material (conductive sheet) or iron plate(c

25、aption)Anti-static wrist strapNX-MD1R/NX-MD11-41.Short the shorting round before the flexible wire is removed from connector CN321 on the MD servo boardas shown in Figure. (When the wire is removed without putting up solder, the MD pick-up assembly might destroy.)2.Please remove solder after connect

26、ing the flexible wire with when you install picking up in the substrate.*Please refer to “Disassembly method“ in the text for pick-up and how to detach the substrate. 5. Attention when MD traverse unit is decomposed6. Attention when CD traverse unit is decomposed1.Short the shorting round before the

27、 flexible wire is removed from connector CN601 on the CD servo boardas shown in Figure. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.)2.Please remove solder after connecting the flexible wire with when you install picking up in the substrate.*Please refe

28、r to “Disassembly method“ in the text for pick-up and how to detach the substrate. CN321PickupShorting roundMD servo control boardShorting roundCN601CD servo boardNX-MD1R/NX-MD11-5Important for laser products1.CLASS 1 LASER PRODUCT2.DANGER : Invisible laser radiation when open and inter lock failed

29、or defeated. Avoid direct exposure to beam.3.CAUTION : There are no serviceable 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 whi

30、chprevent emission of radiation when the drawer is open and the safety interlocks have failed or are defeated. 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

31、 other than those specified herein may result in hazardous radiation exposure.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 lase

32、rstrling ved bning , nr sikkerhedsafbrydere er ude af funktion. Undg udsttelse for strling.ADVARSEL : Usynlig laserstrling ved pning,nr sikkerhetsbryteren er avslott. unng utsettelse for strling.REPRODUCTION AND POSITION OF LABELSWARNING LABELCLASS 1LASER PRODUCT!CAUTIONPlease use enough caution not

33、 to see the beam directly or touch it in case of an adjustment or operationcheck.CLASS 1LASER PRODUCTNX-MD1R/NX-MD11-6Removing the top cover (See Fig.1 and 2)1.2.3.Remove the four screws A attaching the top cover from the back side of the main body.Remove the two screws B attaching the top cover fro

34、m the both sides of the main body.Remove the top cover from the main body while lifting up the back side of the top cover.1.2.3.Prior to performing the following procedure, remove the top cover.Remove the nine screws C attaching the rear cover from the back side of the main body.Set the speaker and

35、antenna terminals to the locked condition.Disengage the claws a of the rear cover from the chassis and remove the cover toward the rear.Removing the rear cover (See Fig.3)Disassembly methodBFig.1Fig.2Fig.3ATop coverAAntenna terminalRear coverCClaw aSpeaker terminalCClaw aTop coverNX-MD1R/NX-MD11-7Re

36、moving the system control board(See Fig.4)Removing the main amplifier board(See Fig.5 and 6)Fig.5Fig.4Fig.61.2.3.4.5.Prior to performing the following procedure, remove the top cover.Prior to performing the following procedure, remove the rear cover.Remove the screw D attaching the card wire support

37、 board, then remove the card wire support board.Disconnect the card wires from connectors CN602 and CN605 on the system control board. Remove the two screws E and screw F attaching the system control board.Disconnect connectors CN603 and CN604 on the system control board from the connector CN693 on

38、the regulator board and the CN694 on the repeater board respectively.Disconnect the wire from connector CN601 on the system control board.1.2.3.4.5.6.Prior to performing the following procedure, remove the top cover.Prior to performing the following procedure, remove the rear cover.Disconnect the ca

39、rd wires from connectors CN661, CN695 and CN511 on the main amplifier board.Remove the protector, then remove the screws G attaching the main amplifier board. Remove the screw H and screw I attaching the main amplifier board.Remove the screw J attaching the heat sink from the back side.Disengage cla

40、w b on the heat sink and disconnect the connectors CN901 and CN904 on the main amplifier board, from connector CN991 on the repeater board and connector CN994 on the regulator board respectively.Disconnect the wire from connector CN301 on the main amplifier board.CN904ECN601CN301CN901Main amplifierb

41、oardCN604FCN605CN602CN603Card wire support boardDSystem control boardGJHICN695CN511CN661ProtectorClaw bRegulator boardENX-MD1R/NX-MD11-8Removing the regulator board(See Fig.7)Removing the AC jack board(See Fig.8)Fig.8Fig.71.2.Prior to performing the following procedure, remove the top cover.Prior to

42、 performing the following procedure, remove the rear cover.Prior to performing the following procedure, remove the system control board.Prior to performing the following procedure, remove the main amplifier board.Remove the two screws K and two screws L attaching the regulator board.Disconnect the w

43、ires from connectors CN903 and CN995 on the regulator board. 1.2.Prior to performing the following procedure, remove the top cover.Prior to performing the following procedure, remove the rear cover.Prior to performing the following procedure, remove the system control board.Prior to performing the f

44、ollowing procedure, remove the main amplifier board.Prior to performing the following procedure, remove the regulator board.Remove the screw M attaching the AC jack board.Disconnect the wire from connector CN921 on the AC jack board. KLCN995RegulatorboardCN903MAC jackboardCN921VoltageSelectorLF901 F

45、9001NX-MD1R/NX-MD11-9Removing the MD mechanism assembly (See Fig.9)Removing the fan motor assembly and fan motor (See Fig.10 and 11)Fig.9Fig.10Fig.111.2.3.Prior to performing the following procedure, remove the top cover.Prior to performing the following procedure, remove the rear cover.Prior to per

46、forming the following procedure, remove the system control board.Prior to performing the following procedure, remove the main amplifier board.Remove the two screws N and two screws P attaching the MD mechanism assembly.(Caution) When assembling, attach the screws N atthe point c so that it also fixe

47、s the earth wire.Disconnect the card wire from connector CN512 on the repeater board. Disengage the hook d from the MD mechanism assembly and lift the rear of the assembly to remove it.1.2.3.Prior to performing the following procedure, remove the top cover.Prior to performing the following procedure

48、, remove the rear cover.Prior to performing the following procedure, remove the system control board.Prior to performing the following procedure, remove the main amplifier board.Prior to performing the following procedure, remove the regulator board.Prior to performing the following procedure, remov

49、e the MD mechanism assembly.Remove the four screws Q attaching the fan motor assembly from the both sides of the sub chassis.Remove the fan motor assembly to the top side. Remove the two screws R attaching the fan motor, then remove the fan motor.(Caution)When assembling, attach the screws Rso that they also fix the