Jvc-UXA-52-Service-Manual电路原理图.pdf

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1、1-1UX-A52SERVICE MANUALMICRO COMPONENET SYSTEMNo.21074Feb. 2002COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.UX-A52UX-A52Area Suffix US - SingaporeUJ - U.S.MilitaryUP - KoreaUW - Brazil,Mexico,PeruSafety precautionsPreventing static electricityImportant for laser productsDisassembly methodAdjustment M

2、ethod ContentsFlow of functional operation until TOC read (CD)Maintenance of laser pickupReplacement of laser pickup Description of major ICs1-21-31-41-51-241-281-291-291-3048STANDBY/ONCOMPACTDIGITAL AUDIOMICRO COMPONENT SYSTEM UX-A52PHONESCOLORCLOCK/TIMER FM MODEDISPLAYSOUNDMODEAHBPROSETCANCELCDDIM

3、MERFM/AMREV.MODE REPEATTAPESTANDBY/ONSLEEPPLAY MODEBEEPVOLUMERM-SUXA52UAUX/MD101234567890 +101-2UX-A521. 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 un

4、less 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 made. Any design alterations of the product shou

5、ld 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 products have special safety-related character

6、istics. 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 safety characteristics are identified in the P

7、arts 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 characteristics as the recommended replacement parts shown i

8、n 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 sharp edges for the prevention of electric sh

9、ock 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 re-assembling the product, always perform an i

10、solation 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 transformer during this check.Plug the AC lin

11、e 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 leakage current must not exceed 0.5mA AC (r.m.s.)

12、.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 exposed metal part and a known good earth ground.Mea

13、sure 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 the plug in the AC outlet and repeat each meas

14、urement. 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 ensure that these safety standards are maintained

15、.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 this probe on each exposedmetal part.AC VOLTMET

16、ER(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 component parts appearing on the silk-screen printed s

17、ide (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. (This regulation does not correspond to J and C version.)1-3UX-A52Preventing static electricity1.Grounding to

18、 prevent damage by static electricityElectrostatic 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.2.About the earth processing f

19、or 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. Be careful to use proper grounding in the area where repairs are being performed. 2-1 Ground the workbenchGround the workbench by laying

20、 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-static wrist strap to release any static electricity built up in your body. 3. Handling the optical pickup1. In order to maintain quality

21、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 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.

22、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 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 re

23、placing 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 to take too long a time when attaching it to the connector. 3. Handle the flexible cable carefully as it may break when subjec

24、ted to strong force. 4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn itAttention when traverse unit is decomposed1.Solder is put up before the card wire is removed from connector onthe CD substrate as shown in Figure. (When the wire is removed withou

25、t putting up solder, the CD pick-upassembly might destroy.)2.Please remove solder after connecting the card wire with when you install picking up in the substrate.*Please refer to “Disassembly method“ in the text for pick-up and how todetach the substrate. (caption)Anti-static wrist strapConductive

26、material (conductive sheet) or iron plateCN601 onmechanismboardShorting roundShorting roundFlexible wire1-4UX-A52Important 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

27、 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 whichprevent emission of radiation when the drawer is open and the saf

28、ety 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 other than those specified herein may result in hazardous radiatio

29、n 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 laserstrling ved bning , nr sikkerhedsafbrydere er ude af funktion. Und

30、g 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 to see the beam directly or touch it in case of an adjustment or o

31、perationcheck.1-5UX-A52Remove the nine screws A on the back of the body.Remove the two screws B on the bottom of the body.Unlock the speaker terminal and the antenna terminal, then remove the rear cover backward with releasing the hooks.1.2.3.Disassembly methodRemoving the rear cover (See Fig.1 and

32、2)Prior to performing the following procedure, remove the rear cover.Remove the two screws C attaching the side panels on the bottom of the body.Remove each side panel backward while releasing the eight joints a as shown in Fig.4 and 5.1.2.Removing the side panels (See Fig.3 to 5)Fig.1AAAAAntenna te

33、rminalRear coverSpeaker terminalFig.2Fig.3Fig.4Fig.5Side panel (R)Side panel (L)Side panel (L)Rear coverBBSide panel (R)Side panel (R)Side panel (L)CCJoint aJoint a Joint aJoint a(Bottom)1-6UX-A52Prior to performing the following procedure, remove the rear cover and the side panels.Remove the two sc

34、rews D on each side of the body.Release the two joints b on each side of the body and remove the top panel in the direction of the arrow.Disconnect the card wires from connector CN705 on the system control board on the left side of the body.1.2.3.Removing the top panel (See Fig.6 and 7) Prior to per

35、forming the following procedure, remove the rear cover, the side panels and the top panel.Disconnect each wire from connector CN706, CN715 and CN716 on the system control board on top of the body.Remove the four screws E retaining the cassette mechanism assembly section on top of the body.1.2.Removi

36、ng the cassette mechanism assembly section (See Fig.8)Reference: If necessary, remove the spacer marked h and the wire from the Cassette mechanism assembly section.REFERENCE: Fig.7Fig.8Fig.6Top panelTop panelDCN705DSystem control boardCN715System control boardCN706E EJoint bJoint bCN716Eh (spacer)Ca

37、ssette mechanism section1-7UX-A52Prior to performing the following procedure, remove the rear cover and the right side panel.Disconnect the card wire from connector CN1 on the tuner board on the right side of the body.Remove the screw G and remove the tuner board upward while disengaging the three j

38、oints c.1.2.Removing the tuner board (See Fig.10)Prior to performing the following procedure, remove the rear cover, the side panels and the top panel.Disconnect the card wire from connector CN701 and the wire from connector CN706, CN715, CN716 on the system control board. Remove the screw F on the

39、left side of the body.Disconnect connector CN709, CN711 and CN712 on the system control board from the body outward.Disconnect the card wire from connector CN704 on the underside of the system control board.1.2.3.4.Removing the system control board(See Fig.9)Fig.9Fig.10System control boardFCN712CN71

40、1CN701CN709CN704CN1GJoints cTuner boardCN715CN716CN7061-8UX-A52Prior to performing the following procedure, remove the rear cover, the side panels, the top panel and the system control board.Release the two joints d on the lower right and left sides of the front panel assembly, then remove the front

41、 panel assembly toward the front.1.Removing the front panel assembly (See Fig.11 and 12)Prior to performing the following procedure, remove the rear cover, the side panels, the top panel, the system control board and the front panel assembly section.Disconnect the wire from connector CN804 on the ma

42、in board.Remove the plastic rivet fixing the headphone jack board.1.2.Removing the headphone jack board(See Fig.13 and 14)Fig.11Fig.12Fig.14Front panel assemblyFront panel assemblyJoint dJoint dHeadphone jack boardFig.13Headphone jack boardMain boardCN804Plastic rivet1-9UX-A52Prior to performing the

43、 following procedure, remove the rear cover, the side panels, the top panel, the cassette mechanism assembly section and and the system control board.Disconnect the wire from connector CN804 on the main board.Remove the five screws H attaching the cassette mechanism bracket.Remove the screw G attach

44、ing the grounding terminal extending from the main board.Disconnect connector CN805 on the main board from the AC jack board while pulling out it. Remove the main board in the direction of the arrow and disconnect the wire from connector CN803 on the reverse side of the main board.Remove the three s

45、crews I attaching the heat sink on the reverse side of the main board.1.2.3.4.5.Removing the main board / the heat sink(See Fig.15 to 17)Fig.15Fig.16Fig.17HMain boardCN805CN803Tuner boardHeat sinkIHGMain boardCN804Cassette mechanism bracketMain boardCN8041-10UX-A52Prior to performing the following p

46、rocedure, remove the rear cover, the side panels, the top panel, the cassette mechanism assembly section, the system control board and the main board / the tuner board.Disconnect the wire from connector CN809 on the AC jack board.Remove the screw J and screw K attaching the AC jack board.1.2.Removin

47、g the AC jack board(See Fig.18 and 19)Prior to performing the following procedure, remove the rear cover, the side panels, the top panel, the cassette mechanism assembly section, the system control board and the main board.Disconnect the wire from connector CN809 on the AC jack board.Cut off the ban

48、d setting the wire on the CD mechanism cover.Remove the four screws L attaching the power transformer assembly.1.2.3.Removing the power transformer assembly (See Fig.20)Fig.18AC jack boardCN809KJFig.19AC jack boardCN809Power transformer assemblyFig.20LAC jack boardCN809Power transformer assemblyBandL