jvc_xmpx50wt_service 维修电路图.pdf

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1、SERVICE MANUAL PORTABLE MINIDISC PLAYER No.20902 Jan. 2001 COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. XM-PX50WT XM-PX50WT Area Suffix UBHong Kong Contents Safety Precautions Important for laser products Attention when MD pick up is exchanged Disassembly method Adjustment method Maintenance of lase

2、r pickup Replacement of laser pickup Description of major ICs 1-2 1-3 1-4 1-5 1-11 1-12 1-12 1-1325 收音机爱好者资料库 Ra d i o Fa n s .CN XM-PX50WT 1-2 1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no change

3、s 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 circuitry of the product should not be made.

4、 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. Many electrical and mechanical parts in the pr

5、oducts 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. Replacement parts which have these special sa

6、fety 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 does not have the same safety characteristics

7、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, high temperature parts, moving parts and/or

8、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 check (Electrical shock hazard testing) After

9、 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 electrical shock. Do not use a line isolati

10、on 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 chassis, to a known good earth ground. Any l

11、eakage 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 by a 0.15 F AC-type capacitor between an exp

12、osed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection 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, rever

13、se 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 the legal responsibility of the repairer to

14、 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 setting for local voltage. Good earth groun

15、d 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 case of preforming repair of this system. 收音机爱好

16、者资料库 Ra d i o Fa n s .CN XM-PX50WT 1-3 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

17、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 safety interlocks have failed or are de feated. It is dangerous to defea

18、t 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. VARNING : Osynlig laserstrlning r denna del r ppnad oc

19、h 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. Undg udsttelse for strling. ADVARSEL : Usynlig laserstrling ved pn

20、ing,nr sikkerhetsbryteren er avslott. unng utsettelse for strling. REPRODUCTION AND POSITION OF LABELS WARNING LABEL DANGER : Invisibie laser radiation when open and interlock or defeated. AVOID DIRECT EXPOSURE TO BEAM (e) VARNING : Osynlig laserstrlning r denna del r ppnad och sprren r urkopplad. B

21、etrakta ej strlen. (s) VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina nkymttmlle lasersteilylle.l katso steeseen. (d) ADVARSEL :Usynlig laserstrling ved bning , nr sikkerhedsafbrydere er ude af funktion. Undg udsttelse for strling. (f) !CAUTION Please use enough caution not to see the

22、beam directly or touch it in case of an adjustment or operation check. 收音机爱好者资料库 Ra d i o Fa n s .CN XM-PX50WT 1-4 The laser diode in the traverse unit (optical pick up) is easy to be destroyed by clothes and the human body to the electrified static electricity. Please note the explosion by static e

23、lectricity when repairing. In the equipment which uses an optical pick up (laser diode), an optical pick up is destroyed by the static electricity of the work environment. Please do the earth processing and work. 2. About the earth processing for the electrostatic destruction prevention 1) Earth of

24、work stand Please pull the conductive material (conductive sheet) or the iron plate to the depository place of the traverse unit (optical pick up), and take the earth to ground. 2) Human body earth Please use the anti-static wrist strap to exhaust the electrified static electricity to the human body

25、. 3. Handling the optical pick up 1) Please return according to a correct procedure based on short processing after exchanging parts. 2) Do not use a tester to check the condition of the laser diode in the optical pick up .The tester s internal power source can easily destroy the laser diode. 4. Att

26、ention when unit is disassembled Please refer to Disassembling method for how to detach . Conductive material (conductive sheet) or the iron plate anti-static wrist strap Attention when MD pickup is exchanged 1. About the static electricity protection measures Solder short 1) Please be sure to solde

27、r before a flexible wire is removed from connector on a main printed circuit board as shown. if you removes without soldering.the MD picking up assembly might destroy 2) When installing , solder in the part of short round should be removed after a flexible wire is connected with connector. XM-PX50WT

28、 1-5 Shift the door lever to open the door. Remove the four screws A and detach the MD door assembly from the main body. 1. 2. Disassembly method Removing the MD door assembly (See Fig.1 and 2) Prior to performing the following procedure, remove the MD door assembly. Turn the Holder assembly as show

29、n in Fig.3. Pull the side arm (L) marked a and remove outward. Open the Holder assembly as shown in Fig.4. Move the “U-shaped” notch marked b in the direction of the arrow and release it from the shaft. Move the part c inward and pull out the Holder assembly from the shaft. 1. 2. 3. 4. Removing the

30、holder assembly (See Fig.3 and 4) When reassembling, first reattach the part c to the shaft of the Chassis assembly. And next, fit the “U-shaped” notch to the shaft. ATTENTION: MD door assembly Door lever A A Fig.1 Fig.2 Fig.3 Part a Part b ”U-shaped” notch Part c Shaft Side arm (L) MD door assembly

31、 Door lever Holder assembly Holder assembly Holder assembly Part c Holder assembly Fig.4 XM-PX50WT 1-6 Prior to performing the following procedure, remove the MD door assembly and the holder assembly. Open the battery lid. Release the tab d and pull out the battery lid. Remove the screw B and pull o

32、ut the side arm (R) upward. Remove the two screws C and pull out the eject unit. Remove the screw D, E, F and G attaching the chassis assembly respectively. Disengage the three joints e of the bottom case and the battery holder. Remove the chassis assembly and the jack cover at once. 1. 2. 3. 4. 5.

33、Removing the chassis assembly (See Fig.5 to 7) Chassis assembly Side arm (R) Battery lid Tab d Joint e B C Eject unit C G D F E Bottom case Battery holder Joints e Battery lid Chassis assembly Fig.5 Fig.6 Fig.7 Chassis assembly Joint e Joints e XM-PX50WT 1-7 Solder the short circuit round of the fle

34、xible wire on the main board. Disconnect the flexible wires from connector CN301 and CN401 on the main board. Remove the one screw H attaching the main board. Remove the main board with the battery holder . Unsolder the four soldered parts f retaining the main board and the battery holder. 1. Removi

35、ng the main board and the battery holder (See Fig.8 and 9) Prior to performing the following procedures, remove the MD door assembly, the holder assembly and the chassis assembly. Prior to performing the following procedures, remove the MD door assembly, the holder assembly, chassis assembly and the

36、 main board. Disconnect the flexible wire extending from the headphone jack from connector CN601 on the main board. 1. When reassembling, connect the flexible wire extending from the pickup to the connector on the main board and unsolder the short circuit round. ATTENTION: Before disconnecting the f

37、lexible wire extending from the pickup, make sure to solder the short circuit round to prevent damage to the pickup. ATTENTION: Removing the headphone jack assembly (See Fig.10) Soldering f Battery holder H CN401 CN301 Headphone jack assembly Main board Battery holder Headphone jack assembly CN601 C

38、N401 CN301 Fig.8 Fig.9 Fig.10 Soldering f Short circuit round Short circuit round Main board XM-PX50WT 1-8 Unsolder the part g on the flexible wire extending from the underside of the Chassis assembly to the spindle motor. 1. Remove the three screws I attaching the spindle motor. 2. Removing the spi

39、ndle motor (See Fig.11) Remove the slit washer and the worm gear from the underside of the Chassis assembly. Remove the screw J attaching the shaft holder and draw out the shaft (lead screw). Pull out the Pickup unit and the lead screw while disengaging the part h and i. 1. 2. 3. Removing the pickup

40、 unit (See Fig.11) Prior to performing the following procedures, remove the MD door assembly, the holder assembly, the chassis assembly and the main board. Do not spill flux on the gear and others.ATTENTION: When handling the Pickup unit, touch the parts marked in Fig.13 only. ATTENTION: Remove the

41、screw K and the lead spring. Pull out the shaft from the pickup. 1. 2. Removing the pickup (See Fig.12 and 13) When handling the pickup unit, touch the parts marked in Fig.13 only. ATTENTION: Lead screw K Lead spring Touch these parts only. Worm gear Slit washer I J Shaft holder Spindle motor Solder

42、ing g Part h Part i Chassis assembly Fig.11 Fig.12 Fig.13 Pickup unit Pickup XM-PX50WT 1-9 Peel off the adhesive tape j on the flexible wire on the underside of the feed motor. Unsolder soldering k connecting the flexible wire to the feed motor. Remove the two screws L attaching the feed motor. 1. 2

43、. 3. Removing the feed motor (See Fig.14) When reassembling, reattach the flexible wire with an adhesive tape and solder. ATTENTION: Chassis assembly Feed motor j Soldering k L Pickup unit L Fig.14 XM-PX50WT 1-10 Remove the four screws A on the bottom of the body. Remove the top cover upward while p

44、ushing the front part a. Pull out the charge board from the bottom cover. 1. 2. Removing the charge board (See Fig.1 to 3) Fig.1 Fig.2 Fig.3 AA AA Top cover Part a Push Charge board Bottom cover XM-PX50WT 1-11 Adjustment method This model is auto adjustment by Remote Controller. Please adjust the at

45、tached remote controller. LCD indication 5. M o T G Test mode setting OK. Indicate at 2sec. When LCD indicate NG at another item, Return back this item by press (STOP) key Resume initialize LCD Indication change : *Initializing *Resume Initializing Servo Servo initialize LCD Indication change : FEED

46、 Executes by LCD Indication change :FwdBwd :Pickup is go to outside Press LCD Indication change :OK :Pickup is go to inside MO TG Insert the Recordable disc. Executes by LCD Indication change : MO DISC ADJUST Executes by LCD Indication change : Press LCD Indication change : OK * MO DISC ADJUST Pre T

47、G Insert the Pre master disc. Executes by LCD Indication change : Pre DISC ADJUST Executes by LCD Indication change : XXYYZZ Press RESET Executes by LCD Indication : Left out the test mode ,power off ,and END. Press and key together more than 3sec. at power off condition. next item .before item. PLA

48、Y LASER Insert the laser power meter. Executes by LCD Indication change :XX:YY Up by .Down by LCD Indication change :VW.YY Setting by LCD Indication change : OK PLAY LASER 7. * Adjusting * Adjusting * Adjusting * Adjusting FEED * 0. TMD-V2 Adjust power-supply voltage 1.5v 20mv before the laser power is adjusted and stops. Laser power adjust 560 adjust Equipments- 1. Remote controller 2. DC power supply 3. Laser power meter 4. MO disc (AU-1)