JVC-UXA7DVD-cs-sm 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD. No.22013 2003/03 UX-A7DVD MICRO COMPONENT SYSTEM 22013200303 UX-A7DVD TABLE OF CONTENTS 1Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2、2Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 3Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . . 1-34 4Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41 DVD/SUPER VCD/VCD/CD DVD AUTO REVERSE COMPACT SUPER VIDEO UX-A7DVD D I G I T A L TAPE AUX/MDREV.MODE BASSFM/AM TREBLE M ULTI COLOR

4、D ISPLA Y 3 W A Y SPEA KER SYSTEM3 W A Y SPEA KER SYSTEM ANGLEAUDIO 123 456 789 100+10 DIMMER CANCEL TOP MENU SET STROBE PREV. FADE MUTING BASS/ TREBLE FM MODE DIGITAL ECHO KEY CONTROL KEY CONTROL 3D PHONICAHB PRO NEXT RETURN SLOW RM-SUXA7DVDU REMOTE CONTROL GROUP SKIP+SLOW AUX/MD DVD SELECTFM/AM VO

5、LUME SHIFT TAPE ENTER MENU CHOICE COLOR ON SCREEN PLAY MODE ZOOM SUB TITLE REV. MODE DIGEST CLOCK/TIMER STANDBY/ON DISPLAY SLEEP DVD LEVEL AP OFF D I G I T A L COMPACT SUPER VIDEO Area suffix US - Singapore UN - Asean RadioFans.CN 收音机爱 好者资料库 UX-A7DVD 1-2 (No.22013) SECTION 1 Important Safety Precaut

6、ions 1.1 Safety Precautions (1) This design of 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 man- ufacturer. Replacement parts must

7、be identical to those used in the original circuits. Services should be per- formed 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 m

8、anufacturers 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 products have special safety-related characteristics. These characteris- tics are often not evident from visual

9、 inspection nor can the protection afforded by them necessarily be obtained by us- ing replacement components rated for higher voltage, watt- age, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manu- al. Electrical components having

10、 such features are iden- tified by shading on the schematics and by () on the Parts List in the Service Manual. The use of a substitute re- placement which does not have the same safety character- istics as the recommended replacement parts shown in the Parts List of Service Manual may create shock,

11、 fire, or oth- er 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 sharp edges for the prevention of electric shock and fire hazard. When service is required, t

12、he original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after reassembling. (5) Leakage shock hazard testing) After reassembling the product, always perform an isolation check on the exposed metal parts of the product (antenna termina

13、ls, 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 transformer during this check. Plug the AC line cord directly into the AC outlet. Using a Leakage Current Tester, mea

14、sure the leakage current from each exposed metal parts of the cabinet, particular- ly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage cur- rent must not exceed 0.5mA AC (r.m.s.). Alternate check method Plug the AC line cord directly into the AC o

15、utlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 ohm 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.

16、 Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path 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

17、.). This corresponds to 0.5 mA AC (r.m.s.). 1.2 Warning (1) This 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 t

18、he 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. 1.3 Caution Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attentio

19、n to such burrs in the case of pre- forming repair of this system. 1.4 Critical parts for safety 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 id

20、entified 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 JC version) RadioFans.CN 收音机爱 好者资料库 UX-A7DVD (No.22013)1-3 1.5 Preventing static electricity Electrostatic discharge (ESD), whi

21、ch 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. 1.5.1 Grounding to prevent damage by static electricity Static electricity in the work area can dest

22、roy 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) Ground the workbench Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the

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

24、tical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.) 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. 1.6 Handling the traverse

25、 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 replace- ment procedure in

26、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 adju

27、sts the laser power. Do not turn it. 1.7 Attention when traverse unit is decomposed *Please refer to Disassembly method in the text for the DVD pickup unit. Apply solder to the short land sections before the flexible wire is disconnected from the connector CN101 on the DVD servo board. (If the flexi

28、ble wire is disconnected without applying solder, the DVD pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire. Short lands DVD servo board Flexible wire CN202 CN201 DVD mechanism assembly Connector

29、RadioFans.CN 收音机爱 好者资料库 UX-A7DVD 1-4 (No.22013) 1.8 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 dis

30、assemble the Laser Unit. Replace the complete Laser Unit if it malfunctions. (4) CAUTION : The compact disc player uses invisible laser radiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are de feated. I

31、t 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. CAUTION Please use enough c

32、aution not to see the beam directly or touch it in case of anadjustment or operation check. VARNING Osynlig laserstrlning r denna del r ppnad och sprren r urkopplad. Betrakta ej strlen. VARO Avattaessa ja suojalukitus ohitettaessa olet alttiina nkymt- tmlle lasersteilylle. l katso steeseen. ADVARSEL

33、 Usynlig laserstrling ved bning, nr sikkerhedsafbrydere er ude af funktion. Undg udsasttelse for strling. ADVARSEL Usynlig laserstrling ved pning, nr sikkerhetsbryteren er avs- lott. unng utsettelse for strling. REPRODUCTION AND POSITION OF LABELS Caution label UX-A7DVD (No.22013)1-5 SECTION 2 Disas

34、sembly method 2.1 Main body 2.1.1Removing the metal cover (See Fig.13) (1) Remove the six screws A on the back of the body. (2) Remove the screw B on each side of the body. (3) Detach the rear side of the metal cover upward while pull- ing the lower sides outward. Fig.1 Fig.2 Fig.3 A A A B Metal cov

35、er B Metal cover UX-A7DVD 1-6 (No.22013) 2.1.2Removing the DVD mechanism assembly (See Fig.4, 5) Prior to performing the following procedure, remove the metal cover. (1) Remove the three screws C attaching the DVD mecha- nism assembly on top of the body. (2) Disconnect connector CN502 and CN503 on t

36、he DVD ser- vo board upward at the bottom of the DVD mechanism as- sembly. Bring up the DVD mechanism assembly and remove back- ward. Fig.4 Fig.5 CC C DVD mechanism assembly CN502 CN503 DVD mechanism assmbly UX-A7DVD (No.22013)1-7 2.1.3Removing the front panel assembly (See Fig.69) Prior to performi

37、ng the following procedure, remove the metal cover and the DVD mechanism assembly. (1) Disconnect the card wire from connector CN705 on the mi- crocomputer board in the center of the right side of the body. (2) Disconnect the card wire from connector CN301,and the wires from connector CN300 and CN71

38、0 on the main board in the center of the left side of the body. (3) Disconnect the card wire from connector CN704, and the wire from CN703 on the microcomputer board. ATTENTION: When disconnecting the wires from CN703 and CN710, remove the spacer attaching the wires. (4) Disconnect the card wire fro

39、m connector CN442 on the FL connection board on top of the body. (5) Remove the screw D on each side of the body. (6) Remove the two screws E on the bottom of the body. (7) Release the joint a on the bottom and the two joints b on the right and left sides of the body using a screwdriver. Re- move th

40、e front panel assembly toward the front. Fig.6 Fig.7 Fig.8 Fig.9 D Front panel assembly b Micro computer board CN705 D Front panel assembly b Micro computer board CN704 Main board CN710 CN301CN300CN703 Spacer CN710 FL connection board CN442 Spacer CN703 CN704 D Front panel assemblyE a UX-A7DVD 1-8 (

41、No.22013) 2.1.4Removing the rear cover / rear panel (See Fig.1014) Prior to performing the following procedure, remove the metal cover and the DVD mechanism assembly. (1) Remove the two screws F on the back of the body. REFERENCE: There is no need to remove the metal cover. (2) Disconnect the card w

42、ire from connector CN1 on the tuner pack on the right side of the body. (3) Remove the twelve screws G and the two screws H on the back of the body. (4) Release the two joints c on the lower right and left sides of the rear panel. REFERENCE: The rear panel with the tuner pack comes off. Fig.10 Fig.1

43、1 Fig.12 Fig.13 Fig.14 Rear cover Rear panel F Rear panel Tuner pack CN1 G G G G H Rear cover Rear panel c Rear panel c UX-A7DVD (No.22013)1-9 2.1.5Removing the tuner pack (See Fig.15) Prior to performing the following procedure, remove the metal cover. (1) Disconnect the card wire from connector CN

44、1 on the tuner pack on the right side of the body. (2) Remove the two screws I on the back of the body. Fig.15 2.1.6Removing the fan (See Fig.16,17) Prior to performing the following procedure, remove the metal cover, the DVD mechanism assembly, the rear cover/rear pan- el and the DVD relay board. (

45、1) Disconnect the wire from connector CN711 on the micro- computer board on the right side of the body. (2) Remove the three screws J attaching the fan bracket on top of the body and release the joint d. (3) Remove the two screws K attaching the fan. Fig.16 Fig.17 CN1 Tuner pack I d J J J Micro comp

46、uter board CN711 Fan bracket K Fan bracket Fan UX-A7DVD 1-10 (No.22013) 2.1.7Removing the headphone board (See Fig.18, 19) Prior to performing the following procedure, remove the metal cover, the DVD mechanism assembly and the front panel as- sembly. (1) Disconnect the wire from connector CN310 on t

47、he main board on the left side of the body. (2) Release the wires from the two clamps on the bottom chas- sis. (3) Remove the screw L attaching the headphone board on the right side of the body. Fig.18 Fig.19 Headphone board Clamp Main board CN310 L Headphone board UX-A7DVD (No.22013)1-11 2.1.8Remov

48、ing the main board (See Fig.20, 21) Prior to performing the following procedure, remove the metal cover, the DVD mechanism assembly, the front panel assem- bly and the rear cover/ rear panel. (1) Remove the two screws M and the three screws N, and then remove the heat sink. (2) Disconnect the wires

49、from connector CN307 and CN310, the card wire from CN312 on the main board on the left side of the body. (3) Remove the screw O and P attaching the main board. (4) Disconnect connector CN303, CN304, CN305 and CN306 on the main board. Release the two joints e at the bottom. (5) Draw out the main board and disconnect the wire from con- nector CN311. Fig.20 Fig.21 2.1.9Removing the DVD relay board (See Fig.22) Prior to performing the following procedure, remove the metal cover, the DVD mechanism assembly and the rear co