Jvc TH-V70 Service Manual

SERVICE MANUAL

DVD DIGITAL THEATER SYSTEM

TH-V70

Area suffix

J ----------------------------- U.S.A. C -------------------------- Canada

TH-V70

SP-XSV70SP-XSV70

SP-PWV70 XV-THV70

Contents

Safety precautions Preventing static electricity Importance administering point on the safety

SP-XCV70 SP-XSV70SP-XSV70

1-2 1-3 1-4

Disassembly method Adjustment method Description of major ICs

1-6 1-21 1-22~54

No.21089

Jul. 2002

TH-V70

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 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 manufacturer`s 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. 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 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 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 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 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 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 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 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 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. Voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

0.15 F AC TYPE

1500 10W

Good earth ground

AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity)

Place this probe on each exposed metal part.

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. It is essential that safety critical components are replaced by approved parts.

5. If mains voltage selector is provided, check setting for local voltage.

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 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 regulation does not correspond to J and C version.)

1-2

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 the 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 DVD players. Be 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-static wrist strap to release any static electricity built up in your body.

(caption) Anti-static wrist strap

TH-V70

Conductive material (conductive sheet) or iron plate

3. Handling the optical pickup

In order to maintain quality during transport and before installation, both sides of the laser diode on the

1. 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 tester's internal power

2. source can easily destroy the laser diode.

4. Handling the traverse unit (optical pickup)

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 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 resistor that adjusts the laser power. Do not turn it.

5. Attention when traverse unit is decomposed

*Please refer to "Disassembly method" in the text for the DVD pickup unit.

Short lands

Apply solder to the short lands before the flexible wire is disconnected from the connector on the DVD servo board. (If the flexible wire is disconnected without applying solder, the DVD pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short lands after connecting the flexible wire.

Flexible wire

Connector

DVD mechanism assembly

CN202

CN201

DVD servo board

1-3

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Importance administering point on the safety

Main board

F901

1-4

Caution: For continued protection against risk of fire, replace only with same type 1.6A/125V for F901. This symbol specifies type of fast operating fuse.

Precaution: Pour eviter risques de feux, remplacez le fusible de surete de F901 comme le meme type que 1.6A/125V. Ce sont des fusibles suretes qui functionnes rapide.

F505

F504

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Power supply & SP terminal board

F403

Mother board

Caution: For continued protection against risk of fire, 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, remplacez le fusible de surete de F403 comme le meme type que 4A/125V, F504 comme le meme type que 8A/125, et 8A/125V pour F505. Ce sont des fusibles suretes qui functionnes rapide.

1-5

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Disassembly method

Removing 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 bottom panel

(See Figs. 2 and 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.

Top plate

Fig.1

Top panel

Bottom panel

Fig.2

Removing the top panel (See Fig. 4.)

Remove the top plate. Remove the bottom panel.

1.2.Slide the top panel toward the rear (direction of the arrow) and disengage it from the engagement sections a and b of the bottom chassis.

Bottom panel

Fig.3

Top panel

Remove the top panel in an upward direction.

1-6

Fig.4

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Removing the DVD mechanism assembly (See Figs. 5 and 6.)

Remove the top plate. Remove the bottom panel. Remove the top panel.

From the 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 servo 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.)

LED board

CN502

Claw c

CN812

Push button

Fig.5

DVD mechanism assembly

DVD servo board

CN503

Front panel assembly

Remove the top plate. Remove the bottom panel. Remove the top panel. Remove the DVD mechanism assembly.

Remove the wire clamp bundling the wires of the front panel assembly.

Remove the card wire of the front panel assembly 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 front panel assembly from the bottom chassis and then remove the front panel assembly in the direction of arrow.

[Reference] Before attaching 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 front panel assembly using a wire clamp.

[Caution] In the assembly, arrange the wires and wire clamp so that they are not touch to the regulator IC(IC953).

Main board

Wire holder

Bottom chassis hole

Claws d

CN803 CN801

Fig.6

CN814

CN813

CN802

CN106

Card wires

Fig.7

Front panel assembly

Fig.8

Main board

Wire clamp

Bottom chassis

Wire

IC953

Claws d

Bottom chassis

1-7

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Removing the DSP/Audio board

(See Figs. 9 and 10.)

Remove the top plate. Remove the bottom panel. Remove the top panel. Remove the DVD mechanism assembly.

From 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 main board.

Compulink board

CN592

CN805

CN806

Tuner

DSP/Audio board

Card wire

[Reference] Before attaching the DSP/Audio board, connect the card wire to the connector CN806 on the main board.

Removing the compulink board

(See Figs. 9 and 10.)

Remove the top plate. Remove the bottom panel. Remove the top panel. Remove the DVD mechanism assembly.

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 the compulink board from the bottom chassis.

Removing the tuner

(See Figs. 9 and 10.)

Remove the top plate. Remove the bottom panel. Remove the top panel. Remove the DVD mechanism assembly.

Fig.9

Rear panel

Fig.10

Disconnect the card wire from connector CN805 on the main board.

From the rear side of the main body, remove the two screws L attaching the tuner.

Take out the tuner from the bottom chassis.

1-8

Removing the main board

(See Figs. 11 and 12.)

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.

Disconnect the card wire from connector CN805 on the main board.

Remove 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.

Main board

Fan motor wire

Wire clamp

Wire holder

Insert this wire into the notch.

CN972

Fig.11

Rear panel

Compulink board

CN592

CN805

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Tuner

Card wire

From the rear side of the main body, remove the three screws N attaching the main board.

Remove the rear panel with the tuner and compulink board.

Take out the main board from the bottom chassis.

[Reference] Attaching the main board When 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. 13 and 14.)

Remove the top plate. Remove the bottom panel. Remove the top panel. Remove the DVD mechanism assembly.

Remove the wire clamp and tie band bundling the fan motor wire.

Fig.12

Fan motor wire

Wire clamp

CN972

Tie band

Fig.13

Bottom chassis Fan motor Front panel

assembly

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.

[Reference] After mounting the fan motor, bundle the fan motor wire using the wire clamp.

Fig.14

1-9

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Remove the top plate. Remove the bottom panel. Remove the top panel. Remove the DVD mechanism assembly. Remove the front panel assembly.

Removing the switch board

(See Fig. 15.)

From the back side of the front panel assembly, remove the four screws Q attaching the switch board.

Removing the open/close board

(See Figs. 15 and 16.)

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 the door motor assembly.

Removing the door motor (See Fig. 16.)

Remove the door motor assembly.

Remove the stop washers attaching the clutch assembly and gear 2.

Remove the clutch assembly, washer and Gear 2.

Door motor assembly

Clutch assembly

Stop washer

Gear 2

Front panel assembly (Back side)

Fig.15

Door motor

Washer

Fig.16

Rod gear assembly

Switch board

T S

Open/close board

Door motor assembly

Remove the two screws T attaching the door motor.

Removing the front board

(See Figs. 17 to 20.)

While widening section e of the front base in the direction of the arrow, remove the rod gear assembly.

Slide the moving panel assembly all the way in the direction of the arrow.

While slightly widening sections f toward the front, take out the moving panel assembly in the direction of the arrow.

Remove the two screws W attaching the moving base of the moving panel assembly.

Disengage the engagement sections g on the inside of the moving base and at the inside of the moving panel assembly and remove the moving base.

Remove the two screws X attaching the front board.

Disengage the claws h of the moving panel and remove the front board.

[Reference] Before attaching the moving base, pass the card wire of the front board through the hole on the moving base. (See Fig.19.)

Front base

Fig.17

Fig.18

Fig.19

Fig.20

Moving panel assembly

Hole

Front base

Moving base

Front board

Moving panel

Card wire

1-10

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Remove the top plate. Remove the bottom panel. Remove the top panel. Remove the DVD mechanism assembly.

Removing the LED board (See Fig. 1.)

From the top side of the DVD mechanism assembly, disengage the claw a of the top chassis attaching the LED board and then remove the LED board.

Removing the DVD mechanism

assembly (See Fig. 2.)

Extend the both sides of the protector, and then

1. raise the protector in the direction of arrow.

Remove the three screws A attaching the DVD

2. mechanism assembly on the top chassis.

Claw a

LED board

Fig.1

DVD mechanism assembly

Top chassis

Removing the DVD servo board

(See Fig. 3.)

[Caution] Be sure to solder the short land sections b on the flexible wire before disconnecting the flexible wire from connector CN101 on the DVD servo board. If the flexible wire is disconnected without attaching solder, the pickup unit may be destroyed by static electricity.

From the back side of the DVD mechanism assembly, attach solder to the short land sections b of the flexible wire that is connected to the connector CN101 of the DVD servo board.

Disconnect the flexible wire from connector CN101 on the DVD servo board.

Disconnect the card wires from connectors CN201 and CN202 on the DVD servo board.

Remove the two screws B attaching the DVD servo board.

Protector

Flexible wire

DVD servo board

Fig.2

Short land sections b

DVD mechanism assembly

CN202

CN101

CN201

Projection e

Top chassis

Projection d

Claw c

While pushing the claw c of the DVD mechanism assembly in the direction of the arrow, remove the DVD servo board from the projections d and e in an upward direction.

[Caution] In the assembly, be sure to remove solder from the short land sections b after connecting the flexible wire.

Fig.3

1-11

TH-V70

Removing the DVD traverse

mechanism assembly (See Fig. 4.)

Remove the DVD servo board.

Remove the two screws C attaching the DVD traverse mechanism assembly.

Disengage the claw f attaching the DVD traverse mechanism assembly and then take out the DVD traverse mechanism assembly.

DVD traverse mechanism assembly

Removing the DVD pickup unit

(See Figs. 5 to 7.)

Remove the DVD servo board. Remove the DVD traverse mechanism assembly.

From the top side of the DVD traverse mechanism assembly, remove the screw D attaching the bracket.

Remove the claw g attaching the thrust spring and then take out the torsion spring.

Remove the lead screw from the section h and then remove the shaft from the section i.

Disengage the section j of the DVD pickup unit and then remove the DVD pickup unit with the shaft.

Pull the shaft out of the DVD pickup unit.

Bracket

DVD traverse mechanism assembly

DVD pickup unit

Claw f

Fig.4

DVD pickup unit

Shaft

Fig.5

Section i

Remove the two screws E attaching the SW. actuator.

SW. actuator

Shaft

Fig.7

1-12

DVD pickup unit

Section j

Section h

Lead screw

Shaft

Claw g

Thrust spring

Fig.6

Attaching the DVD pickup unit

(See Figs. 5 to 9.)

[Reference] Refer to the explanation of "Removing the DVD pickup unit" on the preceding page.

Attach the SW. actuator and shaft to the DVD pickup unit. (See Fig.7.)

Engage the section j of the DVD pickup unit to the shaft of the DVD traverse mechanism assembly first, and set the both ends of the shaft of the DVD pickup unit in the sections i and i' of the DVD traverse mechanism assembly.

Slide the DVD pickup unit all the way in the direction of the arrow.

Mesh the lead screw to the section k of DVD pickup unit and then set the end of the lead screw to the section h.

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Section j

DVD pickup unit

Section i

Shaft

Section i'

Fig.8

Section h

Attach the thrust spring. (See Fig.6.)

Attach the bracket. (See Fig.5.)

Removing the spindle motor board

(See Figs. 10 and 11.)

Remove the DVD servo board. Remove the DVD traverse mechanism assembly.

From the top side of the DVD traverse mechanism assembly, remove the feed motor wire that is soldered to the spindle motor board.

From the back side of the DVD traverse mechanism assembly, remove the three screws F attaching the spindle motor board.

DVD pickup unit

Spindle motor board

Section k

Lead screw

Fig.9

Remove the solders.

Feed motor wire

Feed motor

Fig.11

Spindle motor board

Fig.10

1-13

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Removing the feed motor

(See Figs. 12 to 14.)

Remove the DVD servo board. Remove the DVD traverse mechanism assembly.

Remove the four screws G attaching the traverse mechanism assembly.

Take out the traverse mechanism assembly from the mechanism base.

Remove the screw D attaching the bracket and take out the bracket.

Disengage the claw g attaching the thrust spring and take out the thrust spring.

Pull out the lead screw in the direction of arrow.

Remove the feed gear M.

Remove the feed motor wire that is soldered to the spindle motor board.

Traverse mechanism assembly

Spindle motor board

Bracket

G G

Fig.12

Remove the solders.

Mechanism base

Feed motor

Remove the two screws H attaching the feed motor and take out the feed motor.

Torsion spring

Fig.13

Feed motor wire

Lead screw

Feed motor

Feed gear M

Claw g

1-14

Traverse mechanism assembly

Fig.14

Removing the switch board

(See Fig.15.)

Remove the DVD mechanism assembly.

From the top side of the CD mechanism assembly, remove the screw J attaching the switch board.

Lift the switch board slightly and then remove the wire from connector CN101 on the switch board.

Removing the loading motor assembly

(See Figs.3, 15 to 17.)

TH-V70

CD mechanism assembly Clamper base assembly

Remove the DVD mechanism assembly.

From the back side of the DVD mechanism assembly, disconnect the card wire from connector CN202 on the DVD servo board. (See Fig.3.)

From the top side of the CD mechanism assembly, remove the two screws K attaching the clamper base assembly.

Disconnect the wire from connector CN101 on the switch board while lifting the clamper base assembly slightly and remove the clamper base assembly.

Remove the three screws L attaching the roller holder assembly and take out the roller holder assembly.

Disconnect the wires from connectors CN103 and CN104 on the loading motor assembly.

Remove the belt of the loading motor assembly.

Remove the two screws M attaching the loading motor assembly and take out the loading motor assembly.

CN101

Roller holder assembly

Switch board

Fig.15

Fig.16

CN103

Roller holder assembly

CN104

Loading motor assembly

Fig.17

Belt

1-15

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Removing the amplifier assembly

(See Figs. 1 and 2.)

From the rear side of the speaker main body, remove the four screws A attaching the heat sink cover and then remove the heat sink cover.

Remove the eight screws B attaching the amplifier assembly.

Move the amplifier assembly backward and disconnect the wire from connector CN109 in the lower part of the amplifier assembly.

Removing the rear panel (See Fig. 3.)

Remove the amplifier assembly.

1.2.Pull out the knob.

Amplifier assembly

Fig.1

Heat sink cover

Amplifier assembly

Remove the ten screws C, ten screws D and screw

E attaching the rear panel.

CN109

Fig.2

Amplifier assembly

Knob

CCD

1-16

C D D

Rear panel

Fig.3

Removing the pre-amplifier board

(See Figs. 4 to 6.)

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Mother board

Remove the rear panel.

Remove the two screws F attaching the volume bracket.

Disconnect the pre-amplifier board from the connector CN201 on the mother board and take out the pre-amplifier board.

Pull out the push button.

Remove the two screws G and nut attaching the volume bracket.

Removing the power supply & SP

terminal board (See Figs. 4 and 5.)

Remove the rear panel.

Remove the two screws H attaching the AC bracket.

Disconnect the power supply & SP terminal board from the connectors CN210 and CN211 on the mother board.

Disconnect the wire from connector CN107 on the power supply & SP terminal board.

Disconnect the power cord from connector CN108 on the power supply & SP terminal board.

Volume bracket

Pre-amplifier board

AC bracket

Volume bracket

Pre-amplifier board

Power supply & SP terminal board

Fig.4

Power transformer

CN101

CN111

CN110

Heat sink

CN201

Mother board

CN211

CN210

CN108

Push button

CN107

Fig.5

Volume bracket

Nut

Fig.6

Power cord

Pre-amplifier board

CN101

1-17

+ 39 hidden pages

Jvc TH-V70 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preventing static electricity

Importance administering point on the safety

Disassembly method