JVC-UXF70MD-cs-sm 电路图 维修手册.pdf

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1、1-1 UX-F70MD/UX-F72MD SERVICE MANUAL MICRO COMPONENT MD SYSTEM No.21028 Sep. 2001 COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. UX-F70MD UX-F72MD UX-F70MD/UX-F72MD Contents Safety precautions Preventing static electricity Important for laser products Disassembly method Adjustment Method 1 (CD/MD sect

2、ion) Adjustment Method 2 (Cassette mechanism section) Flow of functional operation until TOC read (CD) Flow of functional operation until TOC read (MD) Maintenance of laser pickup Replacement of laser pickup Maintenance of MD pickup Procedures of changing the MD pickup Description of major ICs 1-2 1

3、-3 1-5 1-6 1-35 1-38 1-40 1-41 1-42 1-42 1-43 1-43 1-4471 This service manual is printed on 100% recycled paper. Area Suffix UB UF Hong Kong China COLOR MD GROUP MD TITLE IMPUT/EDIT CLOCK /TIMERFM MODE DISPLAY /CHARA MD TITLE SEARCH SOUND MODE AHB PRO SET CANCEL CD DIMMER 123 ENTER FM/AM /AUX REV.MO

4、DE REPEAT TAPE STANDBY/ON SLEEP PLAY MODE BEEP VOLUME MD 456 789 100+10 RM-SUXF70MDU MARK STANDBY/ON COMPACT DIGITAL AUDIO MICRO COMPONENT MD SYSTEM UX-F70MD PHONES COLOR MD GROUP MD TITLE IMPUT/EDIT CLOCK /TIMERFM MODE DISPLAY /CHARA MD TITLE SEARCH SOUND MODE AHB PRO SET CANCEL CD DIMMER 123 ENTER

5、 FM/AM /AUX REV.MODE REPEAT TAPE STANDBY/ON SLEEP PLAY MODE BEEP VOLUME MD 456 789 100+10 RM-SUXF70MDU MARK STANDBY/ON COMPACT DIGITAL AUDIO MICRO COMPONENT MD SYSTEM UX-F72MD PHONES CA-UXF72MDCA-UXF70MDSP-UXF70MDSP-UXF70MDSP-UXF72MDSP-UXF72MD RadioFans.CN 收音机爱 好者资料库 1-2 UX-F70MD/UX-F72MD Safety Pre

6、cautions 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 manufacturer. Replacement parts must be identical to those

7、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 should not be made. Any design alterations or additions will void the manufacturers warranty and

8、 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 characteristics are often not evident from visual inspection nor can the prot

9、ection 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 Parts List of Service Manual. Electrical components having such features are identified by s

10、hading 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 in the Parts List of Service Manual may create shock, fire, or other hazards. 4. The leads i

11、n 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, the original lead routing and dress should

12、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 isolation check on the exposed metal parts of the product (antenna terminals, knobs, meta

13、l 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, measure the leakag

14、e 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.) Alternate check method Plug the AC line cord directly into the AC outlet. Use an AC vo

15、ltmeter 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. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor conn

16、ection to eachexposed 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 measurement. voltage measured Any must not exceed 0.75 V AC (r.m.s.). This corresponds to

17、0.5 mA AC (r.m.s.). 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 the relevant safety standards. 4

18、. 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 ground Place this probe on each exposed metal part. AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity) 1500 10W 0.15 F AC TY

19、PE !CAUTION 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. RadioFans.CN 收音机爱 好者资料库 1-3 UX-F70MD/UX-F72MD Preventing static electricity Electrostatic discharge (ESD), which occurs when

20、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 electricity in the work area can destroy the optical

21、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 plate over it before placing the traverse u

22、nit (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 sides of the laser diode on the replacement

23、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. The testers internal power source can easily destroy the laser diode. 1.2. Handling the tr

24、averse 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 replacement procedure i

25、n 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

26、sts the laser power. Do not turn it Conductive material (conductive sheet) or iron plate (caption) Anti-static wrist strap RadioFans.CN 收音机爱 好者资料库 1-4 UX-F70MD/UX-F72MD 1.3. Cautions on removing the CD traverse unit * For removing the CD traverse unit in detail, refer to the Adjustment Method sectio

27、n of this manual. 1. Before disconnecting the flexible wire from the connector CN601 on the CD SERVO board, solder the part shown in the figure below. (Note:If the flexible wire is disconnected from the CN601 without presoldering, it may cause breakdown of the CD pickup assembly.) 2. When reassembli

28、ng the CD traverse unit, be sure to remove the solder from the soldered part after reconnecting the flexible wire to the CN601. CD SERVO board CD SERVO board Soldering part CN601 CN601 CN321 CN451 Pickup Soldering part b MAIN board CD SERVO board 1-5 UX-F70MD/UX-F72MD 1-6 UX-F70MD/UX-F72MD Remove th

29、e seven 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 method Removing the rear cover (See Fig.1 and 2) Prior to performing t

30、he 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.1 Fig.2 Fig.3 Fig.4 Fig.5 A A A

31、A Antenna terminal Rear cover Side panel (R) Side panel (L) Side panel (L) Rear cover B B Side panel (R) Side panel (R) Side panel (L) C C Joint a Joint aJoint a Joint a Speaker terminal (Bottom) 1-7 UX-F70MD/UX-F72MD Prior to performing the following procedure, remove the rear cover and the side pa

32、nels. Remove the two screw D on each side of the body. Release the joint b on each side of the body and remove the cassette mechanism assembly section in the direction of the arrow. Disconnect the card wires from connector CN705, CN743 and CN744 on the system control board on the left side of the bo

33、dy. 1. 2. 3. Removing the cassette mechanism assembly section (See Fig.6 and 7) Prior to performing the following procedure, remove the rear cover, the side panels, the cassette mechanism assembly section and the fan assembly. Disconnect the card wire from connector CN721 on the system control board

34、. Disconnect the card wire from connector CN522 on the underside of the MD mechanism assembly section. Remove the four screws F and the MD mechanism assembly section upward. 1. 2. 3. Removing the MD mechanism assembly section (See Fig.8) Prior to performing the following procedure, remove the rear p

35、anel and the right side panel. Disconnect the wire from connector CN907 on the main board on the right side of the body. Remove the two screws E attaching the fan assembly. 1. 2. Removing the fan assembly (See Fig.6) Fig.7 Fig.8 Fig.6 Cassette mechanism assembly Cassette mechanism assembly E E D Fan

36、 assembly Main board CN907 CN744 CN743 CN705 D System control board CN522 MD mechanism assembly F F F F System control board CN721 Front panel Joint b Joint b 1-8 UX-F70MD/UX-F72MD Prior to performing the following procedure, remove the rear cover and the right side panel. Disconnect the card wire f

37、rom connector CN1 on the tuner board on the right side of the body. Remove the screw H and remove the tuner board upward while disengaging the three joint 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 casset

38、te mechanism assembly section. Remove the screw G on the left side of the body. Disconnect the card wire from connector CN701 and CN721on the system control board. Disconnect connector CN709, CN711 and CN712 on the system control board from the body outward. Disconnect the card wire from connector C

39、N704 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 G CN712 CN711 CN701 CN721 CN709 CN704 CN1 H Joint c Tuner board 1-9 UX-F70MD/UX-F72MD Prior to performing the following procedure, remove the rear cover, the

40、 side panels, the cassette mechanism assembly section 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 panel assembly toward the front. 1. Removing the front panel assembly (See Fig.11 and 12) Prior to perform

41、ing the following rear cover, the side panels, the cassette mechanism assembly section, the system control board and the front panel assembly section. Disconnect the wire from connector CN804 on the main board. Remove the plastic rivet fixing the headphone jack board. 1. 2. Removing the headphone ja

42、ck board (See Fig.13 and 14) Fig.11 Fig.12 Fig.13 Fig.14 Front panel assembly Front panel assembly Joint d Joint d Headphone jack board Headphone jack board Main board CN804 Plastic rivet 1-10 UX-F70MD/UX-F72MD Prior to performing the following procedure, remove the rear cover, the side panels, the

43、cassette mechanism assembly section, the system control board, the MD mechanism assembly section and the main board / the tuner board. Disconnect the wire from connector CN809 on the AC jack board. Remove the screw K and screw L attaching the AC jack board. 1. 2. Removing the AC jack board (See Fig.

44、18 and 19) Prior to performing the following procedure, remove the rear cover, the side panels, the cassette mechanism assembly section, the system control board and the MD mechanism assembly section. Remove the screw I attaching the main board. Remove the screw H attaching the grounding terminal ex

45、tending from the main board. Disconnect the wire from connector CN804 on 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 t

46、he main board. Remove the three screws J 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 Fig.18 Fig.19 CN804 CN803 I H Main board CN805 Main board Main board CN803 CN805 CN804 Heat sink Heat

47、 sink J CN809 AC jack board AC jack board AC jack board CN809 L K Power transformer assembly 1-11 UX-F70MD/UX-F72MD Prior to performing the following procedure, remove the rear cover, the side panels, the cassette mechanism assembly section, the system control board, the MD mechanism assembly sectio

48、n and the main board. Disconnect 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 M attaching the power transformer assembly. 1. 2. 3. Removing the power transformer assembly (See Fig.20) Prior to performing the f

49、ollowing procedure, remove the rear cover, the side panels, the cassette mechanism assembly section, the system control board, the front panel assembly section, the MD mechanism assembly section, the main board / the tuner board and the AC jack board. Cut off the band setting the wire on CD mechanism cover. Release the wire extending from the headphone jack board from the three notches of the CD mechanism cover on the left side of the body. Remove the