JVC THA-9 Service manual

SERVICE MANUAL

DVD DIGITAL THEATER SYSTEM

TH-A9

SP-XSA9

SP-XCA9

SP-XSA9

AUX

TITLE

ZOOM

CONTROL

VCR

SLEEP

SETTING

TV RETURN FM MODE

PLAY MODE

THEATER

POSITION

CHANNELTV VOL VOLUME

/REW

REC

TH-A9TH-A9

STANDBY/ON

AUDIOTV/CATV/DBS

VCR

DVD

FM/AM

DECODE

SUBTITLE

AUDIO

TIME

DIGEST

DISPLAY

CHOICEANGLERETURN

SOUND

SUBWOOFER

EFFECT

CENTER

TEST

REAR-L

REAR-R

100+

AUDIO/ TV/VCR

CAT/DBS

ENTER

DSP

MODE

TV/VIDEO

MUTING

F.SEARCHB.SEARCH

PLAY

UPDOWN

TUNING

PAUSE

STOP

STROBEMEMORY

DVD MENU

SP-PWA9

Contents

Safety precautions Important for laser products Preventing static electricity Dismantling and assembling the treverse unit Disassembly method Discription of major IC's

XV-THA9

RM-STHA9J

DVD THEATER SYSTEM

Areas suffix

J ------------------------- U.S.A.

C ---------------------- Canada

1-2 1-3 1-4

1-5 1-8 1-22

No.20926

Mar. 2001

TH-A9

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 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 eachexposed 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.

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.

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.

1-2

CAUTION

Important for Laser Products

TH-A9

1.CLASS a 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

laserradiation and is equipped with safety switches

whichprevent emission of radiation when the drawer is

open and the safety interlocks have failed or are de

feated. It is dangerous to defeat the safety switches.

5.CAUTION : If safety switches malfunction, the laser is able

to function.

6.CAUTION : Use of controls, adjustments or performance of

procedures other than those specified herein may result in

hazardous radiation exposure.

CAUTION

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

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TH-A9

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.

1.1. 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.

1.1.1. Ground the workbench

1. 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 yourself

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

(caption) Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

1.1.3. Handling the optical pickup

1. 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 condition of the laser diode in the optical pickup. The tester's 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 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 flexible 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 it

1-4

Dismantling and assembling the traverse unit

1. Notice regarding replacement of optical pickup

(Refer to the section regarding anti-static measures.)

1. Do not touch the area around the laser diode and actuator.

2. Do not check the laser diode using a tester, as the diode may easily be destroyed.

3. It is recommended that you use a grounded soldering iron when shorting or removing the laser diode. Recommended soldering iron: HAKKO ESD-compatible product

4. Solder the land on the optical pickup's flexible cable. Note : Short the land after shorting the terminal on the flexible cable using a clip, etc., when using an ungrounded soldering iron. Note : After shorting the laser diode according to the procedure above, remove the solder according to the text explanation.

TH-A9

Shorting

1-5

TH-A9

Importance Admistering point on the Safety (XV-THA9)

Note : It's means "J" for U.S.A. market model and "C" for canada market model.

XV-THA9 C/J ONLY

Full Fuse Replacement Marking

Graphic symbol mark (This symbol means fast blow type fuse.)

should be read as follows ;

FUSE CAUTION

FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE AND RATING OF FUSES ;

F901 : 1.6 A / 125 V

XV-THA9 C/J SEULEMENT

Marquage Pour Le Remplacement Complet De Fusible

Le symbole graphique (Ce symbole signifie fusible de type a fusion rapide.)

doit etre interprete comme suit ;

PRECAUTIONS SUR LES FUSIBLES

POUR UNE PROTECTION CONTINUE CONTRE DES RISQUES D'INCENDIE, REMPLACER SEULEMENT PAR UN FUSIBLE DU MEME TYPE ;

F901 : 1.6 A / 125 V

1-6

Importance Admistering point on the Safety (SP-PWA9)

TH-A9

Note : It's means "J" for U.S.A. market model and "C" for canada market model.

SP-PWA9 C/J ONLY

Full Fuse Replacement Marking

Graphic symbol mark (This symbol means fast blow type fuse.)

should be read as follows ;

FUSE CAUTION

FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE AND RATING OF FUSES ;

F401 : 4A / 125 V F504 : 8A / 125 V F505 : 8A / 125 V

SP-PWA9 C/J SEULEMENT

Marquage Pour Le Remplacement Complet De Fusible

Le symbole graphique (Ce symbole signifie fusible de type a fusion rapide.)

doit etre interprete comme suit ;

PRECAUTIONS SUR LES FUSIBLES

POUR UNE PROTECTION CONTINUE CONTRE DES RISQUES D'INCENDIE, REMPLACER SEULEMENT PAR UN FUSIBLE DU MEME TYPE ;

F401 : 4A / 125 V F504 : 8A / 125 V F505 : 8A / 125 V

1-7

TH-A9

Disassembly method

Removing the DVD door (See Fig.1)

Remove the four screws A that retain the DVD door from the top of the unit.

Removing the right and left side covers

(See Fig.2)

DVD door

Fig.1

Right side cover

Prior to performing the following procedure, remove the DVD door.

Remove the four screws (B) that attach the left and right side covers of the unit, from the bottom panel.

Remove the left and right side covers by moving each of them in the direction of the corresponding arrow.

Bottom panel

Left side cover

Fig.2

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TH-A9

Removing the front panel assembly and the DVD mechanism base

(See Figs.3 to 7)

Prior to performing the following procedure, remove the left and right side covers. Also remove the DVD door.

(Note)

The mechanism slide switch for pickup protection should be set to the SHORTED position.

Remove the three screws (C) that retain the front panel assembly, from the bottom panel of the unit.

Remove four screws (D) that retain the DVD mechanism base, from the top of the unit.

Remove the three screws (E) from the rear panel of the unit that retain the DVD mechanism base.

Remove the DVD mechanism together with the front panel assembly by lifting them upward from the main unit and moving them toward the front.

Disconnect the card wire of the DVD mechanism from the connector CN101 on the DVD servo board.

Disconnect the wire of the LED board from the connector CN812 on the analog input/output board.

Remove the front panel assembly and the DVD mechanism together, just as they were assembled.

Bottom panel

Front panel assembly

Fig.3

DVD mechanism base

Front panel assembly

Fig.4

Front panel assembly

DVD mechanism base

DVD servo board

CN101

DVD mechanism assembly

Analog I/O board

Fig.7

CN812

LED board

Front panel assembly

DVD servo board

CN101

Fig.6

Rear panel

Fig.5

DVD mechanism base

Analog I/O board

CN812

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TH-A9

Separating the front panel assembly and the DVD mechanism base (See Fig.8)

Prior to performing the following procedure, remove the left and right side covers. Also remove the DVD door.

Remove the front panel assembly and the DVD mechanism base together from the main unit. (See Figs. 3 to 7.)

On the back of the DVD mechanism base, disengage the four claws at the engaging points (a) that attach the front panel assembly to the DVD mechanism base, and then pull out the front panel assembly in the direction of the arrow to separate it from the DVD mechanism base.

(Note)

It is at this stage that the front panel assembly and the DVD mechanism base are separated from each other.

Removing the display board (See Fig.9)

Prior to performing the following procedure, remove the left and right side covers. Also remove the DVD door. Also separate the front panel assembly from the DVD mechanism base.

Remove the five screws (F) that retain the display board.

Engaging points (a)

Front panel assembly

DVD mechanism base

Engaging points (a)

Front panel assembly

Fig.8

Display board

Fig.9

Removing the DVD mechanism assembly

(See Figs.10 and 11)

Prior to performing the following procedure, remove the left and right side covers. Also remove the DVD door.

(Note)

Remove the four screws (G) from the back of the DVD mechanism base that retain the DVD mechanism cover.

Remove the DVD mechanism assembly from the DVD mechanism base.

This work is possible even when the front panel assembly is attached to the DVD mechanism base.

Removing the LED board

(See Figs.10 and 11)

Prior to performing the following procedure, remove the left and right side covers. Also remove the DVD door.

(Note)

This work is possible even when the front panel assembly is attached to the DVD mechanism base.

LED board cover

DVD mechanism cover

DVD mechanism assembly

Fig.10

Remove two screws (H) that retain the LED board cover, from the back of the DVD mechanism base.

Remove the LED board by pulling it away from the DVD mechanism base.

1-10

Fig.11

LED board

TH-A9

Removing the analog board

(See Figs.12 to 14)

Prior to performing the following procedure, remove the left and right side covers. Also remove the DVD door. Also remove the front panel assembly and DVD mechanism base.

Disconnect the card wires from the connectors CN401 and CN402 on the analog board.

Remove the screw (I) that retains the analog board bracket from the top of the unit.

Remove the screw (J) and the screw (K) that retain the analog board from the rear panel of the unit.

Disengage the analog board bracket and the gear motor assembly by moving the engaged part (b) upward. Then move the analog board in the direction of the arrow, and remove it as if pulling it out of the rear panel.

Engaging

point (b)

Analog board

CN401

Analog board

Tuner assembly

Analog board

CN402

CN1

Tuner assembly

Analog board bracket

Fig.12

Analog board bracket

CN1

CN402

Engaging point (b)

Remove two screws (L) that attach the analog board to the analog board bracket.

Removing the tuner assembly

(See Figs.12 and 13)

Prior to performing the following procedure, remove the left and right side covers. Also remove the DVD door. Also remove the front panel assembly and the DVD mechanism base.

Remove the three screws (M) that retain the tuner assembly, from the rear panel of the unit.

Disconnect the card wire from the connector CN1 on the tuner assembly.

Fig.13

Analog board

CN401

Analog board bracket

Fig.14

1-11

TH-A9

Removing the fan motor assembly

(See Figs.15 and 16)

Prior to performing the following procedure, remove the left and right side covers. Also remove the DVD door. Also remove the front panel assembly and the DVD mechanism base.

Disconnect the wire from the connector CN972 on the power supply board.

Remove the two screws N that retain the fan motor assembly, from the right side of the unit.

Power supply board

CN972

Fan motor assembly

Fig.15

Remove the two screws (O) that attach the fan motor assembly to the fan bracket.

Removing the gear motor assembly

(See Figs.17 to 19)

Prior to performing the following procedure, remove the left and right side covers. Also remove the DVD door. Also remove the front panel assembly and the DVD mechanism base. Also remove the analog board.

Disconnect the wire from the connector CN106 on the analog input/output board.

Remove the two screws (P) that retain the gear motor assembly and remove the assembly in the direction of the arrow.

(Note)

Remove the belt from the gear motor assembly.

Remove two screws Q that retain the gear motor.

When reassembling, check that the gear motor assembly is engaged properly with the door arm assembly at the engaging points (c) and (d).

Fan motor

Fan bracket

Fig.16

Gear motor assembly

Analog I/O board

CN106

Fig.17

1-12

Fig.19

Belt

Gear motor

Engaging

point (c)

Engaging

point (d)

Gear motor assembly

Analog I/O board

CN106

Fig.18

Removing the door arm assembly

(See Figs.20 to 23)

Disconnect the wires from the connectors CN810 and CN811 on the analog input/output board.

Remove the four screws (R) that retain the door arm assembly, from the top of the unit.

Remove the two screws (S) that retain the door arm assembly, from the left and right sides of the unit.

TH-A9

Door arm assembly

Analog I/O board

CN811

Fig.20

Door arm assembly

Analog I/O board

CN810

Analog I/O board

CN810

Power supply

board

Fig.21

Door arm assembly

Fig.23

Fig.22

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