JVC TH-V70R Schematic

21175200302

TH-V70R

SERVICE MANUAL

DVD DIGITAL CINEMA SYSTEM

TH-V70R

Area suffix

SP-XSV70 SP-XCV70SP-XSV70 SP-XSV70SP-XSV70

DVD DIGITAL CINEMA

SYSTE

TH-

SP-PWV70 XV-THV70R

EE --------- Russian Federation

TV AUDIO

DVD

VCR 1

AUX

FM/AM

VCR

DECODE

AUDIO

ANGLE

SUBTITLE

RETURN DIGEST ZOOM VFP

TOP MENU MENU ZOOM

SOUND

CONTROLÐ SUBWOOFER +EFFECT

VCR

123

CENTER

TEST

456

SLEEP

REAR-L

789

SETTING

REAR-R

+10

TV RETURN

FM MODE

100+

TA/NEWS/INFO

SCREEN

DVD

RDS

PTY PTY

ENTER

SURROUND

CHOICE

MODE

RDS DISPLAY

PTY SEARCH

CHANNEL VOLUMETV VOL

TV/VIDEO MUTING

/REW

FF/

PLAY

TUNING

DOWN UP

PAUSE

STOP

REC

MEMORY

STROBE

DIMMER

RMÐSTHV70R

DVD CINEMA SYSTEM

TABLE OF CONTENTS

1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

No.21175

2003/02

TH-V70R

Important Safety Precautions

1.1 Safety Precautions

(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 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. 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 reassembling.

(5) Leakage shock hazard testing)

After reassembling 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 ohm 10W resistor paralleled by a 0.15 µF AC-type capacitor between an

SECTION 1

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 measure 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.).

1.2 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) It is essential that safety critical components are replaced

by approved parts.

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

voltage.

1.3 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.

1.4 Critical parts for safety

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. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (Except the JC version)

1-2 (No.21175)

1.5 Safety Precautions (U.K only)

(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-

tinued 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.

(2) Any unauthorised design alterations or additions will void the manufacturer's guarantee; furthermore the manufacturer cannot

accept responsibility for personal injury or property damage resulting therefrom.

(3) Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never

be replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts in the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts shown in the Parts List of the Service Manual and 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.

1.5.1 Warning

(1) Service should be performed by qualified personnel only. (2) This equipment has been designed and manufactured to meet international safety standards. (3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained. (4) Repairs must be made in accordance with the relevant safety standards. (5) It is essential that safety critical components are replaced by approved parts. (6) If mains voltage selector is provided, check setting for local voltage.

TH-V70R

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.

(No.21175)1-3

TH-V70R

1.6 Preventing 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.

1.6.1 Grounding to prevent damage 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.

(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) Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(3) Handling the optical pickup

• 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.)

• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily destroy the laser diode.

1.7 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 of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the replace-

ment 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 flexible cable carefully as it may break when subjected to strong force. (4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

1.8 Attention when traverse unit is decomposed

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

• Apply solder to the short land sections before the flexible wire is disconnected from the connector CN101 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 land sections after connecting the flexible wire.

Short lands

DVD mechanism assembly

1-4 (No.21175)

Flexible wire

Connector

CN202

CN201

DVD servo board

1.9 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 Unit. Replace the complete Laser Unit if it malfunctions.

(4) CAUTION : The compact disc player uses invisible laser

radiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are de feated. It is dangerous to defeat the safety switches.

TH-V70R

(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.

CAUTION Please use enough caution not to see the beam directly or touch it in case of anadjustment or operation check.

VARNING

Osynlig laserstrålning är denna del är öppnad och spårren är urkopplad. Betrakta ej strålen.

VARO

Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle. Älä katso säteeseen.

REPRODUCTION AND POSITION OF LABELS

CLASS 1 LASER PRODUCT

ADVARSEL

Usynlig laserstråling ved åbning, når sikkerhedsafbrydere er ude af funktion. Undgå udsasttelse for stråling.

ADVARSEL

Usynlig laserstråling ved åpning, når sikkerhetsbryteren er avslott. unngå utsettelse for stråling.

WARNING LABEL

CAUTION: Invisible laser

radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e)

ADVARSEL: Usynlig laserstråling ved åbning, når sikkerhedsafbrydere er ude af funktion. Undgåudsættelse for stråling. (d)

VARNING: Osynlig laserstrålning när denna del är öppnad och spärren är urkopplad. Betrakta ej strålen. (s)

VARO: Avattaessa ja suojalukitus ohitettaessa oleta lttiina näkymättömälle lasersäteilylle. Älä katso

säteeseen. (f)

CLASS 1 LASER PRODUCT

(No.21175)1-5

TH-V70R

SECTION 2

Disassembly method

2.1 Main body section

2.1.1 Removing the top plate (See Fig. 1.)

From the top side of the main body, remove the four screws A attaching the top plate.

2.1.2 Removing the bottom panel (See Figs. 2 and 3.)

(1) From the rear side of the main body, remove the three

screws B attaching the bottom panel.

(2) From the bottom side of the main body, remove the two

screws C attaching the bottom panel.

(3) Remove the bottom panel in an upward direction.

Top plate

Fig.1

Top panel

Bottom panel

Fig.2

2.1.3 Removing the top panel (See Fig. 4.)

• Remove the top plate.

• Remove the bottom panel. (1) 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.

(2) Remove the top panel in an upward direction.

Bottom panel

Fig.3

Top panel

1-6 (No.21175)

Fig.4

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

• Remove the top plate.

• Remove the bottom panel.

• Remove the top panel. (1) From the top side of the main body, disengage the claw c

of the DVD mechanism assembly and then remove the push button.

(2) Remove the five screws D and screw E attaching the DVD

mechanism assembly.

(3) Disconnect the wire from connector CN812 on the LED

board.

(4) 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.

LED board

TH-V70R

DVD mechanism assembly

CN812

2.1.5 Removing the front panel assembly (See Figs. 7 and 8.)

• Remove the top plate.

• Remove the bottom panel.

• Remove the top panel.

• Remove the DVD mechanism assembly. (1) Remove the wire clamp bundling the wires of the front pan-

el assembly.

(2) Remove the card wire of the front panel assembly from the

wire holder.

(3) Disconnect the wires from connectors CN106 and CN814

on the main board.

(4) Disconnect the card wires from connectors CN802 and

CN813 on the main board.

(5) From the front side of the main body, remove the two

screws F attaching the front panel assembly.

(6) Disengage the claws d of the front panel assembly from the

bottom chassis and then remove the front panel assembly in the direction of the 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).

CN502

Main board

Wire holder

Bottom chassis hole

Claws d

Claw c

CN803 CN801

Push button

Fig.5

Fig.6

CN814

CN813

CN802

CN106

Fig.7

Card wires

Front panel assembly

Fig.8

DVD servo board

CN503

Front panel assembly

Main board

Wire clamp

Bottom chassis

Wire

IC953

Claws d

Bottom chassis

(No.21175)1-7

TH-V70R

2.1.6 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. (1) From the top side of the main body, remove a screw G at-

taching the DSP/Audio board.

(2) From the rear side of the main body, remove the screw H

and two screws J attaching the DSP/Audio board.

(3) Take out the DSP/Audio board from the bottom chassis

and then disconnect the card wire from connector CN806 on the main board.

Reference:

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

2.1.7 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. (1) Disconnect the card wire from connector CN592 on the

compulink board.

(2) From the rear side of the main body, remove the screw K

attaching the compulink board.

(3) Take out the compulink board from the bottom chassis.

2.1.8 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. (1) Disconnect the card wire from connector CN805 on the

main board.

(2) From the rear side of the main body, remove the two

screws L attaching the tuner.

(3) Take out the tuner from the bottom chassis.

Compulink board

Main board

CN592

Fig.9

Rear panel

Fig.10

CN805

CN806

Tuner

DSP/Audio board

Card wire

1-8 (No.21175)

TH-V70R

2.1.9 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. (1) Disconnect the card wire from connector CN805 on the

main board.

(2) Remove the wire clamp bundling the fan motor wire and

then disconnect the wire from connector CN972 on the main board.

(3) Disconnect the card wire from connector CN592 on the

compulink board.

(4) Remove the five screws M and screw M' attaching the main

board.

(5) From the rear side of the main body, remove the four

screws N attaching the main board. (6) Remove the rear panel with the tuner and compulink board. (7) 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.)

Main board

Fan motor wire

Wire clamp

Wire holder

Insert this wire into the notch.

CN972

Fig.11

Rear panel

Fig.12

Compulink board

CN592

Card wire

CN805

Tuner

2.1.10 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. (1) Remove the wire clamp and tie band bundling the fan mo-

tor wire.

(2) Disconnect the wire from connector CN972 on the main

board.

(3) 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.

Fan motor wire

Wire clamp

CN972

Tie band

Fig.13

Bottom chassis Fan motor Front panel

assembly

Fig.14

(No.21175)1-9

TH-V70R

2.2 Front panel assembly section

• Remove the top plate.

• Remove the bottom panel.

• Remove the top panel.

• Remove the DVD mechanism assembly.

• Remove the front panel assembly.

2.2.1 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.

2.2.2 Removing the open/close board (See Figs. 15 and 16.)

(1) From the back side of the front panel assembly, remove the

two screws R attaching the door motor assembly.

(2) Remove the screw S attaching the open/close board of the

door motor assembly.

2.2.3 Removing the door motor (See Fig. 16.)

• Remove the door motor assembly. (1) Remove the stop washers attaching the clutch assembly

and gear 2. (2) Remove the clutch assembly and Gear 2. (3) Remove the two screws T attaching the door motor.

Door motor assembly

Clutch assembly

Stop washer

Gear 2

Front panel assembly (Back side)

Fig.15

Door motor

Fig.16

Switch board

Open/close board

Door motor assembly

1-10 (No.21175)

2.2.4 Removing the front board (See Figs. 17 to 20.)

(1) While widening section e of the front base in the direction

of the arrow, remove the rod gear assembly.

(2) Slide the moving panel assembly all the way in the direction

of the arrow.

(3) While slightly widening sections f toward the front, take out

the moving panel assembly in the direction of the arrow.

(4) Remove the two screws U attaching the moving base of the

moving panel assembly.

(5) Disengage the engagement sections g on the inside of the

moving base and at the inside of the moving panel assem-

bly and remove the moving base. (6) Remove the two screws V attaching the front board. (7) 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 panel assembly (Back side)

Front base

Rod gear assembly

Fig.17

Moving panel assembly

Fig.18

TH-V70R

Front base

Fig.19

Fig.20

Hole

Front board

Moving panel

Moving base

Card wire

(No.21175)1-11

TH-V70R

2.3 DVD mechanism assembly section

• Remove the top plate.

• Remove the bottom panel.

• Remove the top panel.

• Remove the DVD mechanism assembly.

2.3.1 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.

2.3.2 Removing the DVD mechanism assembly (See Fig. 2.)

(1) Extend the both sides of the protector, and then raise the

protector in the direction of the arrow.

(2) Remove the three screws A attaching the DVD mechanism

assembly on the top chassis.

Claw a

LED board

Top chassis

Fig.1

DVD mechanism assembl

Protector

Fig.2

Top chassis

1-12 (No.21175)

2.3.3 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.

(1) From the back side of the DVD mechanism assembly, at-

tach solder to the short land sections b of the flexible wire that is connected to the connector CN101 of the DVD servo board.

(2) Disconnect the flexible wire from connector CN101 on the

DVD servo board.

(3) Disconnect the card wires from connectors CN201 and

CN202 on the DVD servo board. (4) Remove the two screws B attaching the DVD servo board. (5) 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.

Flexible wire

DVD servo board

Short land sections b

DVD mechanism assembly

CN202

CN101

CN201

Projection e

Fig.3

TH-V70R

Projection d

Claw c

2.3.4 Removing the DVD traverse mechanism assembly (See Fig. 4.)

• Remove the DVD servo board. (1) Remove the two screws C attaching the DVD traverse

mechanism assembly.

(2) Disengage the claw f attaching the DVD traverse mecha-

nism assembly and then take out the DVD traverse mechanism assembly.

DVD traverse mechanism assembly

C C

Claw f

Fig.4

(No.21175)1-13

TH-V70R

2.3.5 Removing the DVD pickup unit (See Figs. 5 to 7.)

• Remove the DVD servo board.

• Remove the DVD traverse mechanism assembly. (1) From the top side of the DVD traverse mechanism assem-

bly, remove the screw D attaching the bracket.

(2) Remove the claw g attaching the thrust spring and then

take out the torsion spring.

(3) Remove the lead screw from the section h and then re-

move the shaft from the section i.

(4) Disengage the section j of the DVD pickup unit and then re-

move the DVD pickup unit with the shaft. (5) Pull the shaft out of the DVD pickup unit. (6) Remove the two screws E attaching the SW. actuator.

SW. actuator

Shaft

DVD pickup uni

2.3.6 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. (1) Attach the SW. actuator and shaft to the DVD pickup unit.

(See Fig.7.) (2) 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. (3) Slide the DVD pickup unit all the way in the direction of the

arrow. (4) 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. (5) Attach the thrust spring. (See Fig.6.) (6) Attach the bracket. (See Fig.5.)

Bracket

DVD pickup unit

Shaft

DVD pickup unit

Shaft

Section i'

Fig.7

Fig.8

Section

Section i

Section h

Section k

DVD pickup unit

Section j

1-14 (No.21175)

DVD traverse mechanism assembl

Fig.5

Section i

Section h

Lead scre

Claw g

Thrust spring

Fig.6

Lead scre

DVD pickup unit

Fig.9

Shaft

2.3.7 Removing the spindle motor board (See Figs. 10 and 11.)

• Remove the DVD servo board.

• Remove the DVD traverse mechanism assembly. (1) From the top side of the DVD traverse mechanism assem-

bly, remove the feed motor wire that is soldered to the spindle motor board.

(2) From the back side of the DVD traverse mechanism as-

sembly, remove the three screws F attaching the spindle motor board.

Spindle motor board

TH-V70R

Remove the solders.

Feed moto wire

Feed motor

Fig.10

Fig.11

Spindle moto board

(No.21175)1-15

TH-V70R

2.3.8 Removing the feed motor (See Figs. 12 to 14.)

• Remove the DVD servo board.

• Remove the DVD traverse mechanism assembly. (1) Remove the four screws G attaching the traverse mecha-

nism assembly.

(2) Take out the traverse mechanism assembly from the

mechanism base.

(3) Remove the screw D attaching the bracket and take out the

bracket.

(4) Disengage the claw g attaching the thrust spring and take

out the thrust spring. (5) Pull out the lead screw in the direction of the arrow. (6) Remove the feed gear M. (7) Remove the feed motor wire that is soldered to the spindle

motor board. (8) Remove the two screws H attaching the feed motor and

take out the feed motor.

Traverse mechanism

assembly

Bracket

G G

Fig.12

Mechanism base

Feed moto

Spindle motor board

Thrust spring

Remove the solders.

Feed motor wire

Lead screw

Feed motor

Feed gear M

Claw g

Fig.13

1-16 (No.21175)

Traverse mechanism assembly

Fig.14

TH-V70R

2.3.9 Removing the switch board (See Fig.15.)

• Remove the DVD mechanism assembly. (1) From the top side of the CD mechanism assembly, remove

the screw J attaching the switch board.

(2) Lift the switch board slightly and then remove the wire from

connector CN101 on the switch board.

2.3.10 Removing the loading motor assembly (See Figs.3,

15 to 17.)

• Remove the DVD mechanism assembly. (1) From the back side of the DVD mechanism assembly, dis-

connect the card wire from connector CN202 on the DVD servo board. (See Fig.3.)

(2) From the top side of the CD mechanism assembly, remove

the two screws K attaching the clamper base assembly.

(3) Disconnect the wire from connector CN101 on the switch

board while lifting the clamper base assembly slightly and remove the clamper base assembly.

(4) Remove the three screws L attaching the roller holder as-

sembly and take out the roller holder assembly.

(5) Disconnect the wires from connectors CN103 and CN104

on the loading motor assembly. (6) Remove the belt of the loading motor assembly. (7) Remove the two screws M attaching the loading motor as-

sembly and take out the loading motor assembly.

CD mechanism assembly Clamper base assembl

CN101

K K

Switch board

Fig.15

Roller holde assembly

Fig.16

CN103

Roller holder assembly

CN104

Loading motor assembl

Belt

Fig.17

(No.21175)1-17

TH-V70R

2.4 Speaker section

2.4.1 Removing the amplifier assembly (See Figs. 1 and 2.)

(1) 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.

(2) Remove the eight screws B attaching the amplifier assem-

bly.

(3) Move the amplifier assembly backward and disconnect the

wire from connector CN109 in the lower part of the amplifier assembly.

Amplifier assembl

mplifier assembly

Heat sink cove

Fig.1

2.4.2 Removing the rear panel (See Fig. 3.)

• Remove the amplifier assembly. (1) Pull out the knob. (2) Remove the ten screws C, ten screws D and screw E at-

taching the rear panel.

CN109

Fig.2

Amplifier assembl

Knob

CCD

1-18 (No.21175)

C D D

Fig.3

Rear panel

TH-V70R

2.4.3 Removing the pre-amplifier board (See Figs. 4 to 6.)

• Remove the rear panel. (1) Remove the two screws F attaching the volume bracket. (2) Disconnect the pre-amplifier board from the connector

CN201 on the mother board and take out the pre-amplifier

board. (3) Pull out the push button. (4) Remove the two screws G and nut attaching the volume

bracket.

2.4.4 Removing the power supply & SP terminal board (See Figs. 4 and 5.)

• Remove the rear panel.

(1) Remove the two screws H attaching the AC bracket. (2) Disconnect the power supply & SP terminal board from the

connectors CN210 and CN211 on the mother board.

(3) Disconnect the wire from connector CN107 on the power

supply & SP terminal board.

(4) Disconnect the power cord from connector CN108 on the

power supply & SP terminal board.

Volume bracket

Pre-amplifier board

AC bracket

Volume bracket

Mother board

Fig.4

Power transformer

CN101

Heat sink

CN201

Pre-amplifier board

Power supply & SP terminal board

Volume bracket

Push button

CN107

Nut

CN111

CN110

Fig.5

Mother board

CN211

CN210

CN108

Power cord

Pre-amplifier board

CN101

Fig.6

(No.21175)1-19

TH-V70R

2.4.5 Removing the mother board (See Figs. 7 and 8.)

• Remove the rear panel.

• Remove the pre-amplifier board.

• Remove the power supply & SP terminal board. (1) Disconnect the wire from the connector CN104 on the

mother board. (2) Remove the seven screws J attaching the mother board. (3) Take out the mother board with the power amplifier board

(A,B). (4) From the bottom side of the mother board, remove the two

screws K and two screws L attaching the power amplifier

board (A,B). (5) Remove the power amplifier board (A,B) from connectors

CN202, CN203, CN205 and CN206 on the mother board.

CN104

CN202

Mother board

Power amplifier board (A)

Power amplifier board (B)

Power transforme

Mold base

Fig.7

Mother board

CN206

CN203

Power amplifier board (A)

Power amplifie board (B)

CN205

K L

Fig.8

1-20 (No.21175)

2.4.6 Removing the power amplifier board (A) (See Figs. 9 and 10.)

• Remove the mother board.

(1) Remove the four screws M attaching the heat sink to the

power amplifier board (A).

(2) From the bottom side of the power amplifier board (A), dis-

engage the four engagement sections a.

(3) From the top side of the power amplifier board (A), slide the

P.TR holder (A) in the direction of the arrow to disengage the engagement section b and remove the power amplifier board (A) from the P.TR holder (A).

2.4.7 Removing the power amplifier board (B) (See Figs. 9 and 11.)

• Remove the mother board.

(1) Remove the four screws N attaching the heat sink to the

power amplifier board (B). (See Fig.9.)

(2) From the bottom side of the power amplifier board (B), dis-

engage the four engagement sections c.

(3) arrow to disengage the engagement section d and remove

the power amplifier board (B) from the P.TR holder (B).

P.TR holder (A)

M N

Fig.9

TH-V70R

P.TR holder (B)

(Bottom side)

Power amplifier board (A)

(Bottom side)

P.TR holder (B)

CN102

CN103

Fig.10

CN106

CN105

P.TR holder (A)

(Bottom side)

Power amplifier board (B)

Fig.11

(Bottom side)

(No.21175)1-21

TH-V70R

2.4.8 Removing the power transformer (See Figs. 12 and

13.)

• Remove the rear panel. (1) Remove the wire from the connector CN104 on the mother

board.

(2) Disconnect the wire from the connector CN107 on the pow-

er supply & SP terminal board.

(3) Remove the four screws P attaching the power transformer

and then remove the power transformer from the transformer bracket of the mold base.

Mother board

Power supply & SP terminal board

Transforme bracket

CN104

Power supply & SP terminal board

Power transformer

Fig.12

Mold base

CN107

Fig.13

1-22 (No.21175)

2.4.9 Removing the LED indicator (See Figs. 14 to 16.)

(1) Insert the tip of a flat-bladed screwdriver or a similar tool

into the space between the speaker main body and the ornament panel (the section indicated by the arrows), and lift the net little by little to remove.

Note:

To prevent damaging the ornament panel and speaker main body, insert cushioning plates etc. above and below the tip of the flat-bladed screwdriver or a similar tool.

(2) From the back side of the ornament panel, remove the two

screws Q attaching the LED indicator.

(3) Disconnect the wire from connector CN109 on the LED in-

dicator.

TH-V70R

Ornament panel

JVC

Fig.14

Ornament panel

Cushioning plate, etc.

Speaker main body

Fig.15

CN109

LED indicator

Flat-bladed screwdriver, etc.

Fig.16

(No.21175)1-23

TH-V70R

2.4.10 Removing the speaker (See Figs. 17 and 18.)

(1) Remove the eight screws R attaching the speaker. (2) Take out the speaker. (3) Disconnect the wires from the terminals of the speaker.

Speaker main body

Speaker

Terminal

Ornament panel

Fig.17

Speaker

Fig.18

1-24 (No.21175)

3.1 Initializing in TEST MODE

TH-V70R

SECTION 3

Adjustment method

Initializing in TEST MODE

Moving panel close?

YES

While pressing both the STOP button (fourth button from left) and EJECT (farthest right button) button on the main unit, plug in the power.

FL indication

TEST E

Monitor indication (Upper left of the monitor)

E(Europe)

Pressing the PAUSE button (fifth button from right)

Initialization starts

FL indication

"ATT" will appear

Press the power button on the main unit, and put it in standby.

Make sure that the panel has closed.

Pull out the power plug.

Initialization is complete.

Set the power to standby.

(No.21175)1-25

TH-V70R

SECTION 4

Description of major ICs

4.1 74LCX32MTC-X (IC522) : Quad 2 input OR gate

• Pin layout & Block diagram

11A 21B 31Y 42A 52B 62Y 7

14 13 12 11 10 9 8GND

V 4B 4A 4Y 3B 3A 3Y

(TOP VIEW)

4.2 74LCX373MTC-X (IC512,IC513) : Octal D-type latch

• Pin layout • Truth table

20 19 18 17 16 15 14D2 13 12 11

VCC Q7 D7 D6 Q6 Q5 D5 D4 Q4 LE

1OE 2Q0 3D0 4D1 5Q1 6Q2 7 8D3 9Q3

10GND

(TOP VIEW)

• Truth table

INPUTS OUTPUT ABY LLL LHH HLH HHH

INPUTS OUTPUT

LE D Y

HXXZ

LLXQn LHLL LHHH

X: Don't care Z: High impedance Qn: Q outputs are latched at the time when the LE input is tak-

en to a low logic level.

• Block diagram

2 Q0

D1 4

D3 8

1-26 (No.21175)

4.3 AK93C65AF-X (IC510) : EEPROM

•Pin layout

TH-V70R

• Block diagram

VCC

8 PIN SOP

INSTRUCTION

GND

INSTRUCTION

DECODE,

CONTROL

AND

CLOCK

GENERATION

DATA

ADD.

BUFFERS

R/W AMPS

AND

AUTO ERASE

DECODER

EEPROM

4096bit

256 x 16

• Pin function

Pin no. Symbol Function

1 PE Program enable (With built-in pull-up resistor) 2 VCC Power supply 3 CS Chip selection 4 SK Cereal clock input 5 DI Cereal data input 6 DO Cereal data output 7 GND Ground 8 NC No connection

NOTE :

The pull-up resistor of the PE pin is about 2.5Mohm (VCC=5V)

VREF

VPP SW

VPP

GENERATOR

(No.21175)1-27

TH-V70R

4.4 AK4527BVQP (IC401): A/D, D/A converter

• Pin layout

4443424140393837363534

1 2 3 4 5 6 7 8 9 10 11

1213141516171819202122

Top View

• Pin function

No. Symbol I/O Function

1 SDOS I SDTO Source Select Pin (Note 1)

"L" : Internal ADC output "H" : DAUX input

2 OSKS I Control Mode Select Pin

"L" : 3-wire Serial "H" : I2C Bus

3 MIS - Soft Mute Pin (Note 1) Connect to GND

When this pin goes to "H" soft mute cycle is initialized.

When returning to "L" the output mute releases. 4 BICK I Audio Serial Data Clock Pin 5 LRCK I/O Input Channel Clock Pin 6 SDTI1 I DAC1 Audio Serial Data Input Pin 7 SDTI2 I DAC2 Audio Serial Data Input Pin 8 SDTI3 I DAC3 Audio Serial Data Input Pin 9 SDTO O Audio Serial Data Output Pin

10 D,AUX - Sub Audio Serial Data Input Pin Connect to GND 11 DFS - Double Speed Sampling Mode Pin (Note 1)

"L" : Normal Speed "H" : Double Speed

12 DEMI - Connect to GND

No internal bonding.

13 DEMO - Zero Input Detect Enable Pin Connect to GND

"L" : mode 7 (disable) at parallel mode

- zero detect mode is selectable by DZFM2-0 bits at serial mode.

- H : mode 0 (DZF is AND of all six channels) 14 MCKO - Output Buffer Power supply Pin 2.7V~5.5V 15 DVDD I Digital Power Supply Pin 4.5V~5.5V 16 DVSS - De-emphasis Pin 0V 17 PD

I Power-Down & Reset Pin

When "L" the AK4527B is powered-down and the control registers are reset to default state. If the state of P/S or CAD0-1 changes then the AK4527B must be reset by PDN.

18 XTS - Test Pin Connect to GND

This pin should be connected to DVSS. 19 ICKS - Connect to GND No internal bonding. 20 ADIF - Analog Input Format Select Pin Digital Power Supply

H : Full-differential input "L" : Single-ended input 21 CAD1 - Chip Address 1 Pin Connect to GND

33 32 31 30 29 28 27 26 25 24 23

1-28 (No.21175)

No. Symbol I/O Function

22 CAD0 O Chip Address 0 Pin Connect to GND 23 LOUT3 O DAC3 Lch Analog Output Pin 24 ROUT3 O DAC3 Rch Analog Output Pin 25 LOUT2 O DAC2 Lch Analog Output Pin 26 ROUT2 O DAC2 Rch Analog Output Pin 27 LOUT1 O DAC1 Lch Analog Output Pin 28 ROUT1 O DAC1 Rch Analog Output Pin 29 LIN- I Lch Analog Negative Input Pin 30 LIN+ I Lch Analog Positive Input Pin 31 RIN- I Rch Analog Negative Input Pin 32 RIN+ I Rch Analog Positive Input Pin 33 VREFL - Zero Input Detect 2 Pin (Note 2) Non Connect

When the input data of the group 1 follow total 8192LRCK cycles with "0" input data this pin goes to "H".

OVF O Analog Input Overflow Detect Pin (Note 3)

This pin goes to "H" if the analog input of Lch or Rch is overflows.

34 VCOM O Common Voltage Output PinAVDD/2

Large external capacitor around 2.2uF is used to reduce power-supply noise. 35 VREFH - Positive Voltage Reference Input PinAVDD 36 AVDD - Analog Power Supply Pin4.5V~5.5V 37 AVSS - Analog Ground Pin0V 38 XTI - Zero Input Detect 1 Pin (Note 2) Non connect

When the input data of the group 1 follow total 8192 LRCK cycles with "0" input data this pin

goes to "H". 39 XTO I Master Clock Input Pin 40 P1S - Parallel / Serial Select Pin

"L" : Serial control mode "H" : Parallel control mode 41 CS

CSN I Chip select pin in 3-wire serial control mode

42 DIF1 I Audio Data Interface Format 1 Pin in parallel mode

SCL/CCLK I Control Data Clock Pin in serial control mode

43 LOOP0 I Loopback Mode 0 Pin in parallel control mode

SAD/CDTI I/O Control Data Input Pin in serial control mode

44 CDTD I Loopback Mode 1 Pin (Note 1)

Note:

(1) SDOS, SMUTE, DFS, and LOOP1 pins are ORed with register data if P/S = "L". (2) The group 1 and 2 can be selected by DZFM2-0 bit if P/S = "L" and DZFME = "L". (3) This pin becomes OVF pin if OVFE bit is set to "1" at serial control mode. (4) All input pins should not be left floating.

I Audio Data Interface Format 0 Pin in parallel mode

This pin should be connected to DVDD at I2C bus control mode

I2C = "L" : CCLK(3-wire Serial) I2C = "H" : SCL(I2CBus)

Enables digital loop-back from ADC to 3 DACs.

I2C = "L" : CDTI(3-wire Serial) I2C = "H" : SDA(I2CBus)

Enable all 3 DAC channels to be input from SDTII.

TH-V70R

(No.21175)1-29

TH-V70R

4.5 AN8703FH-V (IC101) : Frontend processor for DVD

• Pin layout

64 49

17 32

• Pin function

Pin No.

10 IDGT I Data slice part address part gate signal

11 STANDBY I Standby mode control terminal 12 SEN I SEN(Serial data input terminal) 13 SCK I SCK(Serial data input terminal) 14 STDI I STDI(Serial data input terminal) 15 RSCL I Standard electric current terminal 16 JLINE I Electric current setting terminal of JLine 17 TEN I Reversing input terminal of tracking error

18 TEOUT O Tracking error signal output terminal 19 AGCBAL I Offset adjusting terminal 1 20 ASOUT O Full adder signal output terminal 21 FEN I Focus error output amplifier reversing in-

22 FEOUT O Focus error signal output terminal 23 AGCOFST I Offset adjusting terminal 2 24 MON - Non connect 25 AGCLVL O Output amplitude adjustment for DRC 26 GND2 - Connect to GND 27 VREF2 O VREF2 voltage output terminal 28 VCC2 - Power supply terminal 5V 29 VHALF O VHALF voltage output terminal 30 DFLTON O Reversing output terminal of filter AMP. 31 DFLTOP O Filter AMP. output terminal 32 DCFLT I Capacity connection terminal for filter

Symbol I/O Description 1 LPC1 I Laser input terminal (DVD) 2 LPC01 O Laser drive signal output terminal (DVD) 3 LPC2 I Laser input terminal (CD) 4 LPC02 O Laser drive signal output terminal (CD) 5

VFOSHORT 6 TBAL I Tracking balance control terminal 7 FBAL I Focus balance control terminal 8 POFLT O Track detection threshold level terminal 9 DTRD I Data slice part data read signal input ter-

I VFOSHORT control terminal

minal(For RAM)

input terminal( For RAM)

output AMP.

put terminal

output

Pin No.

33 GND3 - Connect to GND 34 RFDIFO - Non connect 35 RFOUT - Connect to TP103 36 VCC3 - Power supply terminal 3.3V 37 RFC O Filter for RF delay correction AMP. 38 DCRF O All addition amplifier capacitor terminal 39 OFTR O OFTR output terminal 40 BDO O BDO output terminal 41 RFENV O RF envelope output terminal 42 BOTTOM O Bottom envelope detection filter terminal 43 PEAK O Peak envelope detection filter terminal 44 AGCG O AGC amplifier gain control terminal 45 AGCO O AGC amplifier level control terminal 46 TESTSG I TEST signal input terminal 47 RFINP I RF signal positive input terminal 48 RFINN I RF signal negative input terminal 49 VIN5 I Internal four-partition (CD) RF input 1 50 VIN6 I Internal four-partition (CD) RF input 2 51 VIN7 - Internal four-partition (CD) RF input 3 52 VIN8 - Internal four-partition (CD) RF input 4 53 VIN9 I External two-partition (DVD) RF input 2 54 VIN10 I External two-partition (DVD) RF input 1 55 VCC1 - Power supply terminal 5V 56 VREF1 O VREF1 voltage output terminal 57 VIN1 I Internal four-partition (DVD) RF input 1

58 VIN2 I Internal four-partition (DVD) RF input 2

59 VIN3 I Internal four-partition (DVD) RF input 3

60 VIN4 I Internal four-partition (DVD) RF input 4

61 GND1 - Connect to GND 62 VIN11 I 3 beam sub input terminal 2 (CD) 63 VIN12 I 3 beam sub input terminal 1 (CD) 64 HDTYPE O HD Type selection

Symbol I/O Description

1-30 (No.21175)

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