Jvc-XVLTR-1-Service-Manual电路原理图.pdf

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1、SERVICE MANUALDVD VIDEO PLAYERNo.A0020Nov. 2001COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.XV-LTR1XV-LTR1Area SuffixJ - U.S.A.This service manual is printed on 100% recycled paper.ContentsSafety precautions - 1-2Preventing static electricity - 1-3Importance admisteringpoint on the safety - 1-4Precau

2、tions for service - 1-5Disassembly method - 1-6Adjustment method - 1-15Troubleshooting - 1-19Description of major ICs - 1-23XV-LTR11-21. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should b

3、e 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. Any design

4、 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 products have

5、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 safety charact

6、eristics 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 as the recom

7、mended 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 sharp edges f

8、or 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 reassembling.5. Leakage current check (Electrical shock hazard testing)After reassembling th

9、e 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 isolation transformer dur

10、ing 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 leakage current mus

11、t not exceed 0.5mA AC (r.m.s.).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

12、 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 measure the AC voltage across the resistor. Now, reverse the plug in the

13、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 ensure that these s

14、afety 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 groundPlace this probe on eac

15、h exposedmetal part.AC VOLTMETER(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 appearin

16、g 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. When replacing them, be sure to use the parts of the same type and rating as sp

17、ecified by the manufacturer. (Except the J and C version)XV-LTR11-3Preventing 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

18、this when performing repairs.1.1. Grounding to prevent damage by static electricityStatic electricity in the work area can destroy 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. 1.1.1. Ground the work

19、bench1. 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.1.1.2. Ground yourself1. Use an anti-static wrist strap to release any static electricity built up in your body. 1.1.3. Handling th

20、e optical pickup1. 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 to their original condition. (Refer to the text.)2. Do not use a tester to check the cond

21、ition of the laser diode in the optical pickup. The testers internal power source can easily destroy the laser diode. 1.2. 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

22、 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. Be careful not to take too long a time when attaching it to the connector. 3. Handle the f

23、lexible 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 itConductive material (conductive sheet) or iron plate(caption)Anti-static wrist strapXV-LTR11-4Full Fuse Replacement MarkingGraph

24、ic symbol mark (This symbol means fast blow type fuse.)should be read as follows ;FUSE CAUTIONFOR CONTINUED PROTECTION AGAINST RISKOF FIRE, REPLACE ONLY WITH SAME TYPEAND RATING OF FUSES ;F901 : 1.6 A / 125 V F901 : 1.6 A / 125 VMarquage Pour Le Remplacement Complet De FusiblePRECAUTIONS SUR LES FUS

25、IBLESPOUR UNE PROTECTION CONTINUE CONTRE DES RISQUES DINCENDIE, REMPLACER SEULEMENT PAR UN FUSIBLE DU MEME TYPE ;Le symbole graphique (Ce symbole signifie fusible de type a fusion rapide.)doit etre interprete comme suit ;Importance Admistering point on the Safety F901B7048B7140B7125B7131B7130B7129B7

26、128B7034B7058B7052 B7053B7036B7035B7033B7032B7029B7030B7031B7023B7022B7203B7204B7135B7136 B7116B7114B7115B7142B7222B7025B7028 B7026B7024 B7117B7118B7113B7112B7201B7202B7303B7302B7301B7304 B7057B7401B7305B7306B7307B7308B7309B7606B7501B7021B7219B7218B7134B7012 B7011 B7010B7016B7020K709B7608B7605B5503B

27、7411B7412B7413B7414B7415B7416B5715B7325 B7326 B7327 B7328B7056B7003B7002B7001B7004 B7005 B7006B7007B7008B7009B7013B7014B7141B7015B7107B7324B7321B7322B7330B5708B5707B7111B5702B7104B7103B7105B7102B7106B7019B7017B7101B7018B7137B7133B7132B7409B7808 B7809 B7810B7807B7213B7317B7316B7315B7408B7407B7212B780

28、6B7602B7050B7803B5302B5301B7406B7601B5201B5202B7802CN555B5102B7405B7210B7209B7208B7311B7122B7139B7123B7502B7607B7207C11C12C13C14C15C16C1701C1702C17C421C422C609C619C629C649C659C701C707C711C714C716C717C718C728C730C731C740C741C742C744C745C746C747C750C751C752C754C755C756 C757C761C762C771C772C821C902C907

29、C914C918C960C962C963C964C965C966C969C973C978C979C982C984C985C987C989C992C995C996C997CN701CN702CN703CP951CP952D609 D619D629D639D701D702D709D791 D792D901D902D903D904D908D910D911D950D951D952 D953D954D956D957D960D970D972D973D974D991DI801EP711EP951FC901FC902IC702IC901IC951IC953J601J602J603J702J703K902B70

30、54L1L2L601L602L611L612L621L622L631L632L709L901L951L952L955L957L959P901Q1Q601Q611Q621Q631Q743Q753Q951Q953Q965Q966Q991R1730R1732R606R616R636R650R740R741R742R743R745R750R751R752R753R755R901R903R904R905R906R907R908R910R911R953R954R956R960R976R980T701T901X701C906C908C909C913C916PC901PC902C694C695C696C697

31、C715C721C729C737C738C739C749J604J691L710Q744Q754R1731RA701RA702RA703S691C905B7206B7120,B7119B7951B7801B7403B7402B7221B7312B7124B7313B7314B7211B7320B7051B7038B7039B7040B7041B7037B7042B7319B7046B7043 B7044B7049B7045B7329B7126B7127CN961B5502B5501B5504 B5505 B5506B5205B5104B5152B7217B5714B5101B5303B5304

32、B5305B5107B5718B5705B5706B5704B5703B5108B5109B5507B5508B5105B5720B5106B5701B5153PC30D31D30B5511B5719B5512B5517B5513B5509B5721HS901B7410B5113B5112B5111B5110B7604B5115B5713B5114B7055B5514B5157B5154B5515B5710B5116B5155B5709B5151B5203B5156B7214C904XV-LTR11-5Precautions for ServiceHandling of Traverse Un

33、it and Laser Pickup1. Do not touch any peripheral element of the pickup or the actuator.2. The traverse unit and the pickup are precision devices and therefore must not be subjected to strong shock.3. Do not use a tester to examine the laser diode. (The diode can easily be destroyed by the internal

34、power supply of the tester.)4. To replace the traverse unit, pull out the metal short pin for protection from charging.5. When replacing the pickup, after mounting a new pickup, remove the solder on the short land which is provided at the center of the flexible wire to open the circuit.6. Half-fixed

35、 resistors for laser power adjustment are adjusted in pairs at shipment to match the characteristics of the optical block.Do not change the setting of these half-fixed resistors for laser power adjustment.Destruction of Traverse Unit and Laser Pickup by Static ElectricityLaser diodes are easily dest

36、royed by static electricity charged on clothingor the human body. Before repairing peripheral elements of the traverseunit or pickup, be sure to take the following electrostatic protection:1. Wear an antistatic wrist wrap.2. With a conductive sheet or a steel plate on the workbench on whichthe trave

37、rse unit or the pick up is to be repaired, ground the sheetor the plate.3. After removing the flexible wire from the connector (CN101), short-circuit the flexible wire by the metal clip.4. Short-circuit the laser diode by soldering the land which is providedat the center of the flexible wire for the

38、 pickup.After completing the repair, remove the solder to open the circuit.Please refer to “Fig.4“ of “Disassemblymethod“ for details. Short circuitServo controlboardXV-LTR11-6Disassembly methodRemoving the top cover (see Fig.1)Removing the mechanism assembly(see Fig.2,3)Removing the servo control b

39、oard(see Fig.4)1.Remove the two screws A attaching the top coveron both sides of the body.2.Remove the three screws B attaching the topcover on the back of the body.3.Remove the top cover from the body by liftingthe rear part of the top cover.ATTENTION: Do not break the front panel tabfitted to the

40、top cover.* Prior to performing the following procedure, removethe top cover.* There is no need to remove the front panel assembly.1.Remove the three screws C attaching the mechanismassembly on the bottom chassis.2.Remove the two screws F attaching the lug wire andmain board on the bottom chassis.3.

41、The servo control board is removed from theconnector CN961 and CN701 connected with themain board respectively.4.Remove the mechanism assembly by lifting the rearpart of the mechanism assembly.* Prior to performing the following procedure, removethe top cover and mechanism assembly.1.Disconnect the

42、card wire from connector CN201 andCN202 on the servo control board respectively.2.Disconnect the flexible wire from connector CN101on the servo control board from pick-up.At this time, please extract the wire after short-circuitedof two places on the wire in part a with solder. Please remove the sol

43、der two places of part a afterconnecting the wire with CN101 when reassembling. 3.Two places in hook b are removed, the servo controlboard is lifted, and it is removed. A x 2BBBFig.1CN701CN961Servo control boardMain boardMechanismassemblyFig.3Hook bHook bServo controlboardFig.4C CCCN703CN702Fig.2Mai

44、n boardLug wireMechanism assemblyFFXV-LTR11-7Removing the rear panel (see Fig.5)Removing the front panel assembly(see Fig.6,7)Removing the main board (see Fig.8)*Prior to performing the following procedure, removethe top cover.1.Remove the four screws D attaching the rear panelon the back of the bod

45、y.* Prior to performing the following procedure, removethe top cover.* There is no need to remove the mechanism assembly.1.Remove the one screw E attaching the front panelassembly on the bottom chassis.2.Disconnect the wire from CN702 and CN703 on themain board respectively.3.Hook c and d are remove

46、d respectively, and the frontpanel assembly is removed. * Prior to performing the following procedure, removethe top cover, mechanism assembly and rear panel.1.Disconnect the wire from CN702 and CN703 on themain board respectively.2.Remove the four screws F attaching the main boardon the bottom chas

47、sis.DDDRear panelFig.5EHook cHook dHook dFront panelassemblyFig.6CN703CN702Fig.7Main boardMechanism assemblyCN703CN702Fig.8FFFFMain boardXV-LTR11-8Remove the four screws A attaching the clamper assembly.Move the clamper in the direction of the arrow to release the two joints a on both sides.1.2.Remo

48、ving the clamper assembly (See Fig.1)Prior to performing the following procedure, remove the clamper assembly.Push b of the slide cam into the slot on the left side of the loading base until it stops.Draw out the tray toward the front.1.2.Removing the tray (See Fig.2 and 3)When reattaching, fit the

49、clamper to the two joints a.ATTENTION: Before reattaching the tray, slide the part c of the slide cam to the right as shown in Fig.3.ATTENTION: Joint aJoint aAAA AFig.1Fig.2Fig.3PushbTrayClamper basePart cSlide camXV-LTR11-9Prior to performing the following procedure, remove the clamper assembly and the tray.Remove the four screws B attaching the traverse mechanism assembly.1.R