JVC-NXCDR7R-cs-sm维修电路原理图.pdf

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1、COMPACT COMPONENT CDR SYSTEM NX-CDR7R NX-CDR7R Area suffix B - U.K. E - Continental Europe EN - Northern Europe No.21030 Oct. 2001 COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. CA-NXCDR7RSP-NXCDR7SP-NXCDR7 Contents Safety Precautions Preventing static electricity Important for laser products Disassem

2、bly method Adjustment method Confirm method of operation Flow of functional operation until TOC read Maintenance of laser pickup Replacement of laser pickup Description of major ICs 1-2 1-3 1-4 1-5 1-29 1-30 1-32 1-33 1-33 1-3450 SERVICE MANUAL RadioFans.CN 收音机爱 好者资料库 NX-CDR7R 1-2 1. This design of

3、this product contains special hardware and many circuits 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 circui

4、ts. Services should be performed by qualified personnel 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 m

5、anufacture of responsibility for personal injury or property 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 nec

6、essarily be obtained by using replacement components rated 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 an

7、d by ( ) on the Parts List in the Service Manual. The use 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 a

8、nd dressed with ties, clamps, tubings, barriers and the like 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

9、be confirmed that they have been returned to normal, after re-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, hea

10、dphone jack, control shafts, etc.) to be sure the product is 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

11、 metal parts of the cabinet, particularly any exposed metal 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 method Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms

12、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 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 meta

13、l part, particularly any exposed metal part having a return path to 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. Thi

14、s equipment has been designed and manufactured to meet international 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 crit

15、ical components are replaced by approved parts. 5. If mains voltage selector is provided, check setting for local voltage. Good earth ground Place this probe on each exposed metal part. AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TYPE ! Burrs formed during molding m

16、ay 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 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 resi

17、stor ( ), 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 and rating as specified by the manufacturer. (Except the J and C version) RadioFans.CN 收音机爱 好者资料库 NX-CDR7R 1-3 Preventing static electricity Electr

18、ostatic discharge (ESD), which occurs when static electricity stored 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. 1.1. Grounding to prevent damage by static electricity Static electricit

19、y in the work area can destroy the optical pickup (laser diode) in devices such as DVD players. Be careful to use proper grounding in the area where repairs are being performed. 1.1.1. Ground the workbench 1. Ground the workbench by laying conductive material (such as a conductive sheet) or an iron

20、plate over it before placing the traverse unit (optical pickup) on it. 1.1.2. Ground yourself 1. Use an anti-static wrist strap to release any static electricity built up in your body. 1.1.3. Handling the optical pickup 1. In order to maintain quality during transport and before installation, both s

21、ides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts 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 easi

22、ly destroy the laser diode. 1.2. Handling the traverse unit (optical pickup) 1. Do not subject the traverse unit (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 time when

23、 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 adjusts the laser power. Do not turn it Conductive material (conductive sheet) or iron plate (caption) Anti-static wrist

24、 strap NX-CDR7R 1-4 Important for Laser Products 1.CLASS 1 LASER PRODUCT 2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam. 3.CAUTION : There are no serviceable parts inside the Laser Unit. Do not disassemble the Laser Unit. Replace the c

25、omplete 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 interlocks have failed or are de feated. It is dangerous to defeat the safety switch

26、es. 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. VARNING : Osynlig laserstrlning r denna del r ppnad och sprren r urkoppla

27、d. 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 udsttelse for strling. ADVARSEL : Usynlig laserstrling ved pning,nr sikkerhetsbr

28、yteren er avslott. unng utsettelse for strling. REPRODUCTION AND POSITION OF LABELS WARNING LABEL CLASS 1 LASER PRODUCT !CAUTION Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check. CLASS 1 LASER PRODUCT NX-CDR7R 1-5 Remove the four screws A

29、 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 of both sides. 1. 2. 3. Disassembly method Removing the metal cover (See Fig.1 and 2) Fig.1 Fig.2 A A B 2 Metal cover Metal cover B 2 NX-CDR7R 1-6 Prior

30、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 the 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

31、 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 the front. 1. 2. 3. 4. 5. Removing the front panel assembly (See Fig.3 to 6) Fig.3 Fig.4 Fig.5Fig.6 Front panel assembly CN704 CN712 C

32、N705 CN708 Main board Power board CN905 Main board Front panel assembly Joint b C CN705 Main board CN708 Joint b C D Front panel assembly Front panel assembly Joint a NX-CDR7R 1-7 Prior to performing the following procedure, remove the metal cover. Disconnect the card wire from connector CN704, CN70

33、5, 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 main board from other boards respectively. 1. 2. 3. Removing the main board (See Fig.7 and 8) Fig.

34、7 Fig.8 CN711 CN704 CN708 Main board E Front panel assembly CN705 CN710 CN709 CN712 CN702 CN703 CN701 CN707 CN706 E Main board CN711 CN710 CN702 CN703 CN701 Front panel assembly CN706 CN707 NX-CDR7R 1-8 Prior to performing the following procedure, remove the metal cover. Remove the four screws F on

35、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 / rear panel (See Fig.9 to 12) Fig.9 Fig.10 Fig.11Fig.12 F F

36、 Joint c Joint c Rear cover G G G G G G Rear panel Rear panel Joint d Rear panel Joint d NX-CDR7R 1-9 Prior 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 on the right side of the body. Rem

37、ove 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 procedure, remove the metal

38、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 CN903 on the power bo

39、ard 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.13 Fig.14 Fig.15 H Joint f Joint e Tuner board CN802 Power board Tuner board Band CN904 CN901 Power board CN903 CN905CN902 Band

40、 CN904 CN901 I Joint g NX-CDR7R 1-10 Prior 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 lo

41、wer part 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 t

42、he two screws 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 bo

43、ard 2 / heat sink (See Fig.16 to 19) Fig.16 Fig.17 Fig.18Fig.19 J J Notch h Power amplifier board 2 CN403 Power amplifier board 1 CN101 Power board CN402 Power amplifier board 2 CN405 CN103 Heat sink Power amplifier board 2 Heat sink Power amplifier board 2 Power amplifier board 1 Heat sink IC brack

44、et (1) K K Power amplifier board 2 Power amplifier board 1 Heat sink IC bracket (2) NX-CDR7R 1-11 Prior to performing the following procedure, remove the metal cover, the main board, the rear panel, the tuner board, the power amplifier board 1, the power amplifier board 2 and the heat sink. Removing

45、 the fan (See Fig.20) Prior to performing the following procedure, remove the metal cover, the main board, the rear panel, the tuner board, the power amplifier board 1, the power amplifier board 2 and the heat sink. Disconnect the wire from connector CN203 and CN210 on the power board on the back of

46、 the body. Remove the two screws M attaching the power board. Disconnect connector CN204 and CN207 on the power board from the power board. 1. 2. 3. Removing the power board (See Fig.21) Disconnect the wire from connector CN210 on the power board. Remove the two screws L attaching the fan. Push down

47、 the clamp which settles the wire extending from the power transformer, in the direction of the arrow, and remove the fan backward. 1. 2. 3. The fan is detachable without removing the CDR mechanism assembly. REFERENCE: Fig.20 Fig.21 L L Power board CN210 Clamp Fan M Power board CN204 CN207 Power boa

48、rd CN203 CN210 NX-CDR7R 1-12 Prior to performing the following procedure, remove the metal cover, the front panel assembly, the rear panel, the main board and the tuner board. Removing the CDR mechanism cover / CDR mechanism assembly (See Fig.22 to 27) Remove the spacer settling the card wire on the

49、 right side of the body and release the wire from the clamp and the notch i of the power board on the upper side of the body. Disconnect the card wire from connector CN702 and CN703 on the CDR connection board. Disconnect the wire from connector CN507 on the CD servo board. Disconnect the wire from connector CN210 on the power board on the back of the body and release the wire from the notch h of the power amplifier board 2. Remove the four screws N on th