Jvc-THV-70-Service-Manual-2电路原理图.pdf

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1、TH-V70No.21089Jul. 2002COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.SERVICE MANUALContentsSafety precautionsPreventing static electricityImportance administering pointon the safety1-21-31-41-61-211-2254Disassembly methodAdjustment methodDescription of major ICsTH-V70Area suffixJ - U.S.A.C - CanadaDVD

2、 DIGITAL THEATER SYSTEMSP-PWV70 XV-THV70SP-XCV70 SP-XSV70SP-XSV70SP-XSV70SP-XSV70TH-V701-21. 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 authori

3、zed 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 should not be ma

4、de. 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 characteristics. Thes

5、e 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 Parts List of

6、 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 in the Parts

7、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 shock and fire

8、 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 isolation che

9、ck 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 line cord direc

10、tly 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.).Alternate c

11、heck 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.Measure the AC

12、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 measurement. Vol

13、tage 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.3. Repairs

14、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 VOLTMETER(Having 10

15、00 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 side (parts s

16、ide) 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.)TH-V701-3Conductive material (conductive sheet) or iron plate(ca

17、ption)Anti-static wrist strapShort landsDVD servo boardFlexible wireCN202CN201DVD mechanism assemblyConnector5. Attention when traverse unit is decomposed*Please refer to “Disassembly method“ in the text for the DVD pickup unit. Apply solder to the short lands before the flexible wire is disconnecte

18、d from the connector on the DVD servo board. (If the flexible wire is disconnected without applying solder, the DVDpickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short lands after connecting the flexible wire.Electrostatic discharge (ESD), which oc

19、curs 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.Preventing static electricity1. Grounding to prevent damage by static electricityStatic electricity in the

20、 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. 2. About the earth processing for the destruction prevention by static electricityGround the workbench by laying conductive materia

21、l (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.2-1 Ground the workbench2-2 Ground yourselfUse an anti-static wrist strap to release any static electricity built up in your body.In order to maintain quality during transport and before i

22、nstallation, 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.)Do not use a tester to check the condition of the laser diode in the optical pickup. The testers internal power sourc

23、e can easily destroy the laser diode. 3. Handling the optical pickup1.2.Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.Remove solder of the short lands on the flexible wire after replacing the optical pickup. For specific details, refer to the

24、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.Handle the flexible wire carefully as it may break when subjected to strong force.It is not possible to adjust the semi-fixed resis

25、tor that adjusts the laser power. Do not turn it.4. Handling the traverse unit (optical pickup)1.2.3.4.TH-V701-4Importance administering point on the safetyMain boardCaution: For continued protection against risk offire, replace only with same type 1.6A/125V for F901.This symbol specifies type of fa

26、st operating fuse.Precaution: Pour eviter risques de feux, remplacezle fusible de surete de F901 comme le meme typeque 1.6A/125V. Ce sont des fusibles suretes qui functionnes rapide.F901 TH-V701-5Power supply & SP terminal boardF403F505Mother boardF504Caution: For continued protection against risk o

27、ffire, replace only with same type 4A/125V for F403,8A/125V for F504, 8A/125V for F505.This symbol specifies type of fast operating fuse.Precaution: Pour eviter risques de feux, remplacezle fusible de surete de F403 comme le meme typeque 4A/125V, F504 comme le meme type que 8A/125, et 8A/125V pour F

28、505. Ce sont des fusibles suretes qui functionnes rapide.TH-V701-6Fig.1Fig.2Fig.3Fig.4ABCATop plateTop panelTop panelBottom panelBottom panelbbaDisassembly methodRemoving the top plate (See Fig. 1.)From the top side of the main body, remove the four screws A attaching the top plate.Removing the bott

29、om panel(See Figs. 2 and 3.)1.2.3.From the rear side of the main body, remove the three screws B attaching the bottom panel.From the bottom side of the main body, remove the two screws C attaching the bottom panel.Remove the bottom panel in an upward direction.1.2.Slide the top panel toward the rear

30、 (direction of the arrow) and disengage it from the engagement sections a and b of the bottom chassis.Remove the top panel in an upward direction.Removing the top panel (See Fig. 4.)Remove the top plate.Remove the bottom panel.TH-V701-7Fig.5Fig.7Fig.6Fig.8DVD mechanismassemblyDVD servo boardMain boa

31、rdCN812LED boardPush buttonDDFDClaw cClaws dBottomchassis holeBottom chassisFront panel assemblyClaws dCN502CN803 CN801CN503Main boardWireCard wiresWire clampCN802CN813CN106Front panel assemblyBottom chassisWire holderCN814IC953ERemoving the DVD mechanism assembly (See Figs. 5 and 6.)1.2.3.4.From th

32、e top side of the main body, disengage the claw c of the DVD mechanism assembly and then remove the push button.Remove the five screws D and screw E attaching the DVD mechanism assembly.Disconnect the wire from connector CN812 on the LED board.Disconnect the connectors CN502 and CN503 on the DVD ser

33、vo board from connectors CN801 and CN803 on the main board while lifting the DVD mechanism assembly in an upward direction.Removing the front panel assembly(See Figs. 7 and 8.)1.2.3.4.5.6.Remove the wire clamp bundling the wires of the front panel assembly.Remove the card wire of the front panel ass

34、embly from the wire holder.Disconnect the wires from connectors CN106 and CN814 on the main board.Disconnect the card wires from connectors CN802 and CN813 on the main board.From the front side of the main body, remove the two screws F attaching the front panel assembly.Disengage the claws d of the

35、front panel assembly from the bottom chassis and then remove the front panel assembly in the direction of arrow. Remove the top plate.Remove the bottom panel.Remove the top panel.Remove the top plate.Remove the bottom panel.Remove the top panel.Remove the DVD mechanism assembly.ReferenceBefore attac

36、hing the front panel assembly, pass the card wire of the front panel assembly through the hole on the bottom chassis.After attaching the front panel assembly,bundle the wires and card wire of the frontpanel assembly using a wire clamp. CautionIn the assembly, arrange the wires and wireclamp so that

37、they are not touch to theregulator IC(IC953).TH-V701-8Fig.9Fig.10Rear panelJLHKGCard wireDSP/AudioboardCard wireCN806CN805CN592TunerCompulink boardRemoving the tuner(See Figs. 9 and 10.)1.2.3.Disconnect the card wire from connector CN805 on the main board.From the rear side of the main body, remove

38、the two screws L attaching the tuner.Take out the tuner from the bottom chassis.Removing the compulink board(See Figs. 9 and 10.)1.2.3.Disconnect the card wire from connector CN592 on the compulink board.From the rear side of the main body, remove the screw K attaching the compulink board.Take out t

39、he compulink board from the bottom chassis.Remove the top plate.Remove the bottom panel.Remove the top panel.Remove the DVD mechanism assembly.Remove the top plate.Remove the bottom panel.Remove the top panel.Remove the DVD mechanism assembly.Removing the DSP/Audio board(See Figs. 9 and 10.)1.2.3.Fr

40、om the top side of the main body, remove a screw G attaching the DSP/Audio board.From the rear side of the main body, remove the screw H and two screws J attaching the DSP/Audio board.Take out the DSP/Audio board from the bottom chassis and then disconnect the card wire from connector CN806 on the m

41、ain board.Remove the top plate.Remove the bottom panel.Remove the top panel.Remove the DVD mechanism assembly.ReferenceBefore attaching the DSP/Audio board, connectthe card wire to the connector CN806 on the main board.TH-V701-9Fig.11Fig.12Fig.13Fig.14Wire holderMain boardCN592MMMMWire clampBottom c

42、hassis Fan motor Front panelassemblyMCN972CN972CN805Rear panelNPTunerCompulink boardInsert this wire into the notch.Tie bandWire clampFan motor wireFan motor wireCard wireRemoving the main board(See Figs. 11 and 12.)1.2.3.4.5.6.7.Disconnect the card wire from connector CN805 on the main board.Remove

43、 the wire clamp bundling the fan motor wire and then disconnect the wire from connector CN972 on the main board.Disconnect the card wire from connector CN592 on the compulink board.Remove the five screws M and screw M attaching the main board.From the rear side of the main body, remove the three scr

44、ews N attaching the main board.Remove the rear panel with the tuner and compulink board.Take out the main board from the bottom chassis.Remove the top plate.Remove the bottom panel.Remove the top panel.Remove the DVD mechanism assembly.Remove the front panel assembly.Remove the DSP/Audio board.Refer

45、ence Attaching the main boardWhen attaching the screw M, attach the wire holder together with it.After connecting the wires to the connectors, bundle them using the wire clamp.Insert the DVD mechanism assembly wire into the notch on the bottom chassis.(See Fig. 11.)Removing the fan motor(See Figs. 1

46、3 and 14.)1.2.3.Remove the wire clamp and tie band bundling the fan motor wire.Disconnect the wire from connector CN972 on the main board.From the left side of the main body, remove the two screws P attaching the fan motor.Remove the top plate.Remove the bottom panel.Remove the top panel.Remove the

47、DVD mechanism assembly.ReferenceAfter mounting the fan motor, bundle the fan motor wire using the wire clamp.TH-V701-10Fig.15Fig.16Fig.17Fig.18Fig.19Fig.20Switch boardDoor motor assemblyFront panel assembly(Back side)WXRQFront panel assembly(Back side)Rod gear assemblyeFront baseMoving panel assembl

48、yFront basefggMoving panelMoving baseHoleFront boardhCard wireTDoor motorStop washerWasherOpen/closeboardGear 2Clutch assemblySDoor motor assemblyRemoving the switch board(See Fig. 15.)From the back side of the front panel assembly, remove the four screws Q attaching the switch board.Remove the top

49、plate.Remove the bottom panel.Remove the top panel.Remove the DVD mechanism assembly.Remove the front panel assembly.Removing the front board (See Figs. 17 to 20.)ReferenceBefore attaching the moving base, pass the card wire of the front board through the hole on the moving base. (See Fig.19.)1.2.From the back side of the front panel assembly, remove the two screws R attaching the door motor assembly.Remove the screw S attaching the open/close board of