Jvc-NXCDR-7-R-Service-Manual电路原理图.pdf

《Jvc-NXCDR-7-R-Service-Manual电路原理图.pdf》由会员分享，可在线阅读，更多相关《Jvc-NXCDR-7-R-Service-Manual电路原理图.pdf（88页珍藏版）》请在收音机爱好者资料库上搜索。

1、COMPACT COMPONENT CDR SYSTEMNX-CDR7RNX-CDR7RArea suffixB - U.K.E - Continental EuropeEN - Northern EuropeNo.21030Oct. 2001COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.CA-NXCDR7RSP-NXCDR7 SP-NXCDR7ContentsSafety PrecautionsPreventing static electricityImportant for laser productsDisassembly methodAdju

2、stment methodConfirm method of operationFlow of functional operation until TOC readMaintenance of laser pickupReplacement of laser pickupDescription of major ICs1-21-31-41-51-291-301-321-331-331-3450SERVICE MANUALNX-CDR7R1-21. This design of this product contains special hardware and many circuits a

3、nd 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 personnel on

4、ly.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 propert

5、y 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 rated f

6、or 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 use of

7、 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 like

8、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, after re

9、-assembling.5. Leakage currnet 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 is sa

10、fe 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 par

11、t 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 1

12、,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 t

13、o the chassis, and meausre 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.). 1. This equipment has been designed and manufactured to meet internation

14、al 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 voltage se

15、lector 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!Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such b

16、urrs in the case of preforming repair of this system.In regard with component 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

17、 for safety. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (Except the J and C version)NX-CDR7R1-3Preventing static electricityElectrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is dischar

18、ged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.1.1. Grounding to prevent damage by static electricityStatic electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players. Be careful

19、to use proper grounding in the area where repairs are being performed. 1.1.1. Ground the workbench1. Ground 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.1.1.2. Ground yourself1. Use an anti-s

20、tatic wrist strap to release any static electricity built up in your body. 1.1.3. 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 pa

21、rts to their original condition. (Refer to the next page.)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. 1.2. Handling the traverse unit (optical pickup)1. Do not subject the traverse unit

22、(optical pickup) to strong shocks, as it is a sensitive, complex unit. 2. For specific details, refer to the replacement procedure in the text. Be careful not to take too long a timewhen attaching it to the connector. 3. Handle the flexible cable carefully as it may break when subjected to strong fo

23、rce. 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(caption)Anti-static wrist strapNX-CDR7R1-4Important for Laser Products1.CLASS 1 LASER PRODUCT2.DANGER : Invisible laser radiation when open an

24、d inter lock failed 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

25、 safety switches whichprevent 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 perfo

26、rmance of procedures 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.ADV

27、ARSEL : Usynlig laserstrling 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 us

28、e enough caution not to see the beam directly or touch it in case of an adjustment or operationcheck.CLASS 1LASER PRODUCTNX-CDR7R1-5Remove the four screws A on the back of the body.Remove the screw B on each side of the body.Remove the rear part of the metal cover upward while pulling the lower part

29、 of both sides.1.2.3.Disassembly methodRemoving the metal cover (See Fig.1 and 2)Fig.1Fig.2AAB 2Metal coverMetal coverB 2NX-CDR7R1-6Prior to performing the following procedure, remove the metal cover.Disconnect the card wire from connector CN705, CN708, CN704 and CN712 on the main board.Disconnect t

30、he wire from connector CN905 on the power board.Remove the two screws C on each side of the body.Remove the two screws D on the bottom of the body.Disengage the joint a on the bottom and the two joints b on the lower side of the body using a screwdriver. Then remove the front panel assembly toward t

31、he front.1.2.3.4.5.Removing the front panel assembly (See Fig.3 to 6)Fig.3Fig.4Fig.5Fig.6Front panel assemblyCN704CN712CN705CN708Main boardPower boardCN905Main boardFront panel assemblyJoint bCCN705Main boardCN708Joint bCDFront panel assemblyFront panel assemblyJoint aNX-CDR7R1-7Prior to performing

32、the following procedure, remove the metal cover.Disconnect the card wire from connector CN704, CN705, CN706, CN707, CN708, CN709 and CN712 on the main board on the upper side of body.Remove the two screws E on the upper side of the body.Disconnect connector CN701, CN702, CN703, CN710, CN711 on the m

33、ain board from other boards respectively.1.2.3.Removing the main board (See Fig.7 and 8)Fig.7Fig.8CN711CN704CN708Main boardEFront panel assemblyCN705CN710CN709CN712CN702CN703CN701CN707CN706EMain boardCN711CN710CN702CN703CN701Front panel assemblyCN706CN707NX-CDR7R1-8Prior to performing the following

34、procedure, remove the metal cover.Remove the four screws F on the back of the body, and press the two joints c inward to release.Remove the thirteen screws G attaching the rear panel.Disengage the two joints d in the lower part of the rear panel using a screwdriver.1.2.3.Removing the rear cover / re

35、ar panel (See Fig.9 to 12)Fig.9Fig.10Fig.11Fig.12FFJoint cJoint cRear coverGGGGGGRear panelRear panelJoint dRear panelJoint dNX-CDR7R1-9Prior to performing the following procedure, remove the metal cover, the main board and the rear panel.Disconnect the wire from connector CN802 on the tuner board o

36、n the right side of the body.Remove the screw H attaching the tuner board.Move the tuner board upward and outward to disengage the tuner board from the base chassis at the joint f, and from the power board at the joint e.1.2.3.Removing the tuner board (See Fig.13)Prior to performing the following pr

37、ocedure, remove the metal cover, the main board and the rear panel.Remove the band attaching the wire to the power board on the back of the body.Disconnect the wire from connector CN901, CN904 and CN905 on the power board.Remove the screw I on the left side of the body.Disconnect connector CN902 and

38、 CN903 on the power board from the power board, and move the power board upward to disengage it from the base chassis at the joint g.1.2.3.4.Removing the power board (See Fig.14 and 15)Fig.13Fig.14Fig.15HJoint fJoint eTuner boardCN802Power boardTuner boardBandCN904CN901Power boardCN903CN905 CN902Ban

39、dCN904CN901IJoint gNX-CDR7R1-10Prior to performing the following procedure, remove the metal cover, the main board, the rear panel and the tuner board.Disconnect the wire from connector CN403 on the power amplifier board 2.As the wire extending from the fan, take it off the notch h in the lower part

40、 of the power amplifier board 2.Disconnect connector CN101 and CN103 on the power amplifier board 1, and CN402 and CN405 on the power amplifier board 2 from the power board respectively. The heat sink is still attached to the power amplifier board 1 and the power amplifier board 2.Remove the two scr

41、ews J attaching the IC bracket (1) on the back of the heat sink, and remove the power amplifier 1.Remove the three screws K attaching the IC bracket (2) on the back of the heat sink, and remove the power amplifier 2.1.2.3.4.5.Removing the power amplifier board 1 / power amplifier board 2 / heat sink

42、 (See Fig.16 to 19)Fig.16Fig.17Fig.18Fig.19JJNotch hPower amplifier board 2CN403Power amplifier board 1CN101Power boardCN402Power amplifier board 2CN405CN103Heat sinkPower amplifier board 2Heat sinkPower amplifier board 2Power amplifier board 1Heat sinkIC bracket (1)KKPower amplifier board 2Power amplifier board 1Heat sinkIC bracket (2)