JVC XV-D721BK, XV-D723GD Service Manual

SERVICE MANUAL

DVD AUDIO/VIDEO PLAYER

XV-D721BK

XV-D721BK XV-D723GD

XV-D723GD

Area Suffix

XV-D721BK J

C EG ES EN EE

Area Suffix

XV-D723GD A

J EG ES EN UF

U.S.A

Canada

Germany

Spain

Northern Europe

Russian Federation

US Minitary

Australia

U.S.A

Germany

Singapore

Northern Europe

China

Brazil,Mexico,Peru

Contents

Safety Precautions Preventing static electricity Important for laser products Importance Admistering point on the Safety

This service manual is printed on 100% recycled paper.

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1-5

Disassembly method Adjustment method Description of major ICs

1-6 1-11 1-18

No.A0002

Nov. 2000

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XV-D721BK XV-D723GD

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. Alter ations 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 proper ty damage resulting therefrom.

3. Many electrical and mechanical par ts 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 par ts 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 ser vice is required, the or iginal 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.

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

Move the resistor connection to eachexposed metal part, par ticularly 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.).

0.15 F AC TYPE

1500 10W

Place this probe on each exposed metal part.

This corresponds to 0.5 mA AC (r.m.s.).

Good earth ground

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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.

XV-D721BK XV-D723GD

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

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XV-D721BK XV-D723GD

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 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.

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

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

CLASS 1 LASER PRODUCT

REAR

FRONT CENTER

LEFT

RIGHT

ANALOG

PCM/STREAM

DIGITAL

COAXIAL

OPTICAL

AUDIO OUT AV COMPU LINK

SUBWOOFER

VIDEO S-VIDEO

YPBP

COMPONENT

VIDEO OUT

SCAN MODE

525p 525i

CLASS 1 LASER PRODUCT

AC IN

CAUTION - - LASER RADIATION WHEN OPEN.

DO NOT STARE INTO BEAM.

ATTENTION RAYONNEMENT LASER EN CAS D’OUVERTURE.

NE PAS REGARDER DANS LE FAISCEAU.

- VORSICHT LASERSTRAHLUNG, WENN ABDECKUNG GEÖFFENET. NICHT IN DEN STRAHL BLICKEN.

- ADVARSEL LASERSTRÅ LING VED Å BNING. SE IKKE IND I STRÅ LEN.

- ADVARSEL LASERSTRÅ LING NÅ R DEKSEL Å PNES. STIRR IKKE INN I STRÅ LEN.

VARNING LASERSTRÅ LNING NÄR DENNA DEL ÄR ÖPPNAD.

STRRA EJ IN I STRÅ LEN.

VARO! AVATTAESSA OLET ALTTIINA LASERSÄTEILYLLE.

ÄLÄ TUIJOTA SÄTEESEEN.

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Importance Admistering point on the Safety

XV-D721BK XV-D723GD

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

XV-D721BK/XV-D723GD 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-721BK/XV-723GD 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

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XV-D721BK XV-D723GD

Disassembly method

< Main body>

Removing the top cover (See Fig.1)

Remove the four screws A on each side of the body.

Remove the two screws B on the back of the body.

Remove the top cover from behind in the direction of the arrow while pulling the lower part of the sides.

Removing the rear panel (See Fig.2)

A 2

Top cover

Fig.1

Prior to performing the following procedure, remove the top cover.

Remove the sixteen screws C on the back of the body.

Removing the fitting (See Fig.3 to 5)

Prior to performing the following procedure, remove the top cover.

ATTENTION:

Lower the mechanism by moving the lever marked a in the direction of the arrow from the upside of the body (Refer to Fig.3).

Manually eject the loading tray toward the front.

Remove the fitting from the loading tray by releasing the joints b on the both sides of the fitting.

Push and return the loading tray.

To remove the front panel assembly and the DVD mechanism assembly, remove the fitting in advance.

Lever a

Fig.2

Rear panel

Loading tray

1-6

Joint b

Fitting

Joint b

Loading tray

Fig.3

Loading tray

Fig.4Fig.5

XV-D721BK XV-D723GD

Removing the front panel assembly

(See Fig.6 to 9)

Prior to performing the following procedure, remove the top cover and the fitting.

Disconnect the card wire from connector CN818 on the regulator board.

Turn back the body and remove the three screws D fixing the front panel assembly.

Release the two joints c on both sides of the body and remove the front panel assembly toward the front.

Regulator board

CN818

Front panel assembly

Fig.6

Front panel assembly

(Bottom)

Fig.7

Fig.8

Joint c

Fig.9

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XV-D721BK XV-D723GD

Removing the DVD mechanism

(See Fig.10)

Prior to performing the following procedure, remove the top cover and the fitting. It is not necessary to remove the front panel assembly.

Disconnect the card wire from connector CN816 and the harness from CN817 on the regulator board.

Disconnect the card wire from connector CN701 on the video board.

Disconnect the card wire from CN831 on the DSP board.

Remove the four screws E and the DVD mechanism assembly by pulling out from the front panel assembly backward.

Removing the regulator board

(See Fig.11 and 12)

Regulator board

CN816

CN817

Regulator board

Video board

CN701

DVD mechanism assembly

Fig.10

CN711 CN815

DSP board

CN831

Prior to performing the following procedure, remove the top cover. It is not necessary to remove the rear panel.

Disconnect the card wire from connector CN816 and CN818 and the harnesses from CN815,CN817 and CN711 on the regulator board.

Remove the three screws F attaching the regulator board.

Remove the two screws C on the rear panel.

CN816 CN817

CN818

Rear panel

Fig.11

Fig.12

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XV-D721BK XV-D723GD

Removing the video board

(See Fig.13 and 14)

Prior to performing the following procedure, remove the top cover.

Ref. :

It is not necessary to remove the rear panel.

Disconnect the harnesses from the connector CN711 on the regulator board.

Disconnect the card wire from connector CN701 on the video board.

Remove the five screws C on the rear panel.

Removing the Audio board 1,2 and 3 / the Audio board (See Fig.13,15 and 16)

Prior to performing the following procedure, remove the top cover and rear panel.

Remove the three screws C attaching the audio board 1,2 and 3.

Regulator board

CN815

CN711

Video board

Fig.13

Rear panel

Fig.14

Audio board 3

CN701

Audio board 2

Audio board 1

Audio board CN831

Disconnect the audio board 1,2 and 3 from the audio board respectively.

Disconnect the harnesses from connector CN815 on the regulator board.

Disconnect the card wire from connector CN831 on the audio board.

Remove the two screws G attaching the audio board.

Audio board 1

Audio board 3

Audio board 2

Fig.15

Audio board

CN831

Fig.16

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XV-D721BK XV-D723GD

Removing the DVD servo board

(See Fig.17)

Prior to performing the following procedure, remove the top cover and the DVD mechanism assembly.

Turn over the DVD mechanism assembly and disconnect the card wire from connector CN102 and CN103 on the DVD servo board.

Remove the two screws H attaching the DVD servo board. Move the DVD servo board in the direction of the arrow to release the two corner joints d.

DVD mechanism board

CN103

Joint d Joint d

DVD servo board

Fig.17

CN102

Prior to performing the following procedure, remove the top cover and the front panel assembly.

Removing the FL board / the power switch board (See Fig.18 and 19)

Remove the eight screws I and three screws J on the back of the front panel assembly. Remove the FL board and the power switch board at the same time.

Disconnect the harness from connector CN903 on

the FL board.

FL board

Power switch board

Fig.18

Power switch board

CN903 FL board

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Fig.19

XV-D721BK XV-D723GD

Adjustment method

This model has the TEST mode for simple diagnosis of the internal function. Use the TEST mode for diagnosing and checking the set as mentioned below.

Details of the TEST mode

The TEST mode comprises the five modes of the following.

FL indication (*: numeral)

1.DVD AUDIO copyright protection key serial indication Indicates the content of the DVD AUDIO copyright at shipment. Use this mode for checking it.

2.Microcomputer's version number indication Indicates the initial version number of the microcomputer at shipment. Use this mode for checking it.

3.Servo signal system check mode CHECK Use this mode for checking the laser pickup status.

4.Indication check mode The FL and LED's go on in full. The LED's and FL of the set go on in full. Use this mode for checking indications.

5.Microcomputer software upgrading mode UPGRADE Use this mode for upgrading the microcomputer software.

How to set the TEST mode

1.While pressing the STOP key and PLAY key of the set together, plug in the power cord.

*Continue to pressing both the STOP key and PLAY key until reading of disk data completes (until the "NOW READING"

message changes into a DVD logo).

2."TEST *" message appears on the FL. (* In the part of the sign, the sign is different according to the destination.)

3.The five modes of the TEST mode change one after another each time the DISPLAY OFF key of the set is pressed.

4.To recover the usual operation mode, turn off the set by pressing the POWER ON/OFF key.

********

**_**_**

How to check the laser pickup

Since the laser pickup of the set is easily affected by static electricity, heat, etc., it may be damaged depending on use

condition. If the set shows such a symptom as it fails in reading disk data, check the laser pickup as follows.

* Checking laser current

1.Enter the set into the "servo signal system check mode" of the TEST mode.

2.Press the SKIP | key of the set. The laser is turned on and the LAS **** message appears on the FL display. **** in the message indicates the current in code. For knowing the actual laser current, read the first two figures (omitting the last two figures) and convert the number into the current (mA) referring to the following conversion table, because the FL indication is a hexadecimal number. Since the FL indication varies because of self-heating of the set, read the indication value about 20 seconds after the set was turned on. If the indicated value is the OK level (see the conversion table), the laser is judged to be normal in the initial status by this simple checking method.

3. Press the STOP key to set back the check mode to the initial status.

Laser current conversion table

FL indication

Current (mA)

Judgment

FL indication

Current (mA)

Judgment

FL indication

Current (mA)

Judgment

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XV-D721BK XV-D723GD

* Automatic adjustment/Jitter value indication

1.Enter the set into the "servo signal system check mode" of the TEST mode.

2.Open the tray with the OPEN key of the set. Set the TEST disk VT-501 on the tray and put back the tray with the CLOSE key. Then, press the PAUSE key. The TEST disk starts rotation to execute automatic adjustment. If the set is in the normal condition, the "CHECK OK" message appears. If there is something abnormal in the adjustment values, an error message appears and it mostly comes from a failure in the servo system (including the mechanism and pickup). In such the event, refer to the check points by errors. When using the TEST disk VT-501, carefully check to see if there is neither damage nor dirt on the read surface of the disk beforehand.

3.Press the STOP key to return the check mode to the initial status.

4.After the automatic adjustment with the TEST disk completes, press the PLAY key. The disk starts rotation and a jitter value (signal read precision in percentage) appears on the FL display (JIT 0***). If the indication value (in *** places) is 110 (11 %) or less, it can be judged by this simple checking method that the signal read precision of the set is satisfactory. Before using the TEST disk VT-501, carefully check it if there is neither damage nor dirt on the read surface.

5.Press the STOP key to return the mode to the initial status.

Upgrading microcomputer software

The internally incorporated microcomputer software of this set can be revised in part for the reason that the set is designed to conform to new standards and to be capable of playing disks to be put on the market by other manufacturers. To upgrade the internal microcomputer software, use the upgrade disk and follow the procedure mentioned below.

* How to upgrade the microcomputer software

1.Set the upgrade disk in the set and enter it into the TEST mode.

2.After confirming that the set completes reading of the upgrade disk data while looking at the indication on the monitor screen, change the TEST mode to the microcomputer software upgrading mode and then press the PLAY key.

3.The set completes writing of the upgrade disk data approximately 1 minute later and it is automatically reset by the self-resetting function. Then the set again reads the upgrade disk and stops automatically.

4.Take the upgrade disk out of the set and turn it off with the POWER ON/OFF key.

5.Again enter the set into the TEST mode, and press the SKIP key and then the PAUSE key.

6.Make sure that the DVD AUDIO indicator goes on a few seconds after the above-mentioned operation, check the version number of the microcomputer software in the microcomputer software version number indication mode. *Carefully carry out the above procedure. If data write is interrupted in the middle of course by power failure or careless shutdown operation, not only the data of the internal software may be damaged but the set may fail in resetting. The version number of the internal microcomputer software is shown as follows.

FL indication: ** ** **

[IC901] [IC401] [IC508/IC509] Symbol number of microcomputer IC

Initializing the set

Initialization of the set returns it to the initial status at shipment. Be sure to initialize the set after repair service.

* How to initialize the set

1.Enter the set into the TEST mode and press the SKIP key first and the PAUSE key second.

2.Make sure that the DVD AUDIO indicator goes on a few seconds later.

DVD AUDIO copyright protection

To protect the DVD AUDIO copyright from infringement, a number proper to each DVD AUDIO set called a device key is assigned to each set. If a proper device key is not set for a set, it fails in playing a copyrighted disk. The management number of the device key of a set can be checked by the DVD AUDIO copyright protection

key serial indication in the TEST mode. If the "???...." message appears in this check mode, the set has a

failure in the device key. If it occurs, inquire at the Service Section of the Audio and Communication Division, JVC.

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