JVC-UXA52-cs-sm 电路图 维修手册.pdf

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1、1-1 UX-A52 SERVICE MANUAL MICRO COMPONENET SYSTEM No.21074 Feb. 2002 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. UX-A52 UX-A52 Area Suffix US - Singapore UJ - U.S.Military UP - Korea UW - Brazil,Mexico,Peru Safety precautions Preventing static electricity Important for laser products Disassembly me

2、thod Adjustment Method Contents Flow of functional operation until TOC read (CD) Maintenance of laser pickup Replacement of laser pickup Description of major ICs 1-2 1-3 1-4 1-5 1-24 1-28 1-29 1-29 1-3048 STANDBY/ON COMPACT DIGITAL AUDIO MICRO COMPONENT SYSTEM UX-A52 PHONES COLOR CLOCK /TIMERFM MODE

3、 DISPLAY SOUND MODE AHB PRO SET CANCEL CD DIMMER FM/AM REV.MODEREPEAT TAPE STANDBY/ON SLEEP PLAY MODE BEEP VOLUME RM-SUXA52U AUX/MD 10 123 456 789 0+10 RadioFans.CN 收音机爱 好者资料库 1-2 UX-A52 1. This design of this product contains special hardware and many circuits and components specially for safety pu

4、rposes. 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 only. 2. Alterations of the design or c

5、ircuitry 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 property damage resulting therefrom. 3. Man

6、y 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 for higher voltage, wattage, etc. Re

7、placement 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 a substitute replacement which doe

8、s 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 to be separated from live parts, h

9、igh 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-assembling. 5. Leakage currnet ch

10、eck (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 safe to operate without danger of

11、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 part having a return path to the ch

12、assis, 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 per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled b

13、y 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 to the chassis, and meausre th

14、e 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 international safety standards. 2. It is

15、 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 selector is provided, check

16、 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 may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the cas

17、e 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 for safety. (This

18、 regulation does not correspond to J and C version.) RadioFans.CN 收音机爱 好者资料库 1-3 UX-A52 Preventing static electricity 1.Grounding to prevent damage by static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy th

19、e 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. Be

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

21、tatic wrist strap to release any static electricity built up in your body. 3. Handling the optical pickup 1. 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

22、 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. 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

23、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 replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. B

24、e 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 adjusts the laser power. Do not turn it Attention when traverse unit is decomp

25、osed 1.Solder is put up before the card wire is removed from connector on the CD substrate as 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 card wire with when you install picking up in the su

26、bstrate. *Please refer to Disassembly method in the text for pick-up and how to detach the substrate. (caption) Anti-static wrist strap Conductive material (conductive sheet) or iron plate CN601 on mechanism board Shorting round Shorting round Flexible wire RadioFans.CN 收音机爱 好者资料库 1-4 UX-A52 Importa

27、nt 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 complete Laser Unit if it ma

28、lfunctions. 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 switches. 5.CAUTION : If safety s

29、witches 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 urkopplad. Betrakta ej strlen. VARO

30、 : 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 sikkerhetsbryteren er avslott. unng uts

31、ettelse 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. 1-5 UX-A52 Remove the nine screws A on the back of the body. Remove the two screws B o

32、n 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 method Removing the rear cover (See Fig.1 and 2) Prior to performing the following procedure, remove the rear cover. Remove the two screw

33、s 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.1 A A A A Antenna terminal Rear cover Speaker terminal Fig.2 Fig.3 Fig.4 Fig.5 Side panel (R) Side

34、panel (L) Side panel (L) Rear cover B B Side panel (R) Side panel (R) Side panel (L) C C Joint a Joint aJoint aJoint a (Bottom) 1-6 UX-A52 Prior to performing the following procedure, remove the rear cover and the side panels. Remove the two screws D on each side of the body. Release the two joints

35、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 performing the following procedure, remove the rear c

36、over, 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. Removing the cassette mechanism assembly section (S

37、ee Fig.8) Reference: If necessary, remove the spacer marked h and the wire from the Cassette mechanism assembly section. REFERENCE: Fig.7 Fig.8 Fig.6 Top panel Top panel D CN705D System control board CN715 System control board CN706 EE Joint b Joint b CN716 E h (spacer) Cassette mechanism section 1-

38、7 UX-A52 Prior 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 joints c. 1. 2. Removin

39、g 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 left side of the

40、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.9 Fig.10 System control board F CN712 CN711 C

41、N701 CN709 CN704 CN1 G Joints c Tuner board CN715 CN716 CN706 1-8 UX-A52 Prior 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 remov

42、e the front 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

43、CN804 on the main board. Remove the plastic rivet fixing the headphone jack board. 1. 2. Removing the headphone jack board (See Fig.13 and 14) Fig.11 Fig.12 Fig.14 Front panel assembly Front panel assembly Joint d Joint d Headphone jack board Fig.13 Headphone jack board Main board CN804 Plastic rive

44、t 1-9 UX-A52 Prior to performing the 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 mecha

45、nism bracket. Remove the screw G attaching 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 s

46、ide of the main board. Remove the three screws 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.15 Fig.16 Fig.17 H Main board CN805 CN803 Tuner board Heat sink I H G Main board CN804 Cassette mechanism brac

47、ket Main board CN804 1-10 UX-A52 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 / the tuner board. Disconnect the wire from connector CN809 on the AC jack board.

48、Remove the screw J and screw K attaching the AC jack board. 1. 2. Removing 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. D

49、isconnect the wire from connector CN809 on the AC jack board. Cut off the band 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.18 AC jack board CN809 K J Fig.19 AC jack board CN809 Power transformer assembly Fig.20 L AC jack board CN809 Power transformer assembly Band L 1-11 UX-A52 Prior to p