JVC XV-M50BK Service Manual

SERVICE MANUAL

DVD VIDEO PLAYER

XV-M50BK

TV DVD

STANDBY/ON

DISC

SELECT

TV DVD

PLAY

TV/VIDEO

MODE

PHONIC

CANCEL

RETURN

TV1 TV2 TV3

123

TV4 TV5 TV6

TV7 TV8 TV9

-/-- TV0 MUTING

0+1010

THEATER POSITION

SUBTITLEANGLE

AUDIO

DIGEST

SELECT

R A

–

L T I

VOL

ENTER

RM-SXVM50J REMOTE CONTROL

ZOOM

T R

VOL

P S I

STANDBY

STANDBY/ON

PLAY & EXCHANGE

DVD / VIDEO CD / CD

10-bit/27MHz VIDEO D/A CONVERTER

DOLBY

D I G I T A L

DISC

XV-M50 DVD/CD PLAYER

DISC TITLE CHAP RESUME THEATER

DVD EACH

SKIP

DISC 3

DISC 2

DISC 1

PAUSEPLAYSTOP

XV-M50BK

Contents

Safety precautions ------------------------ 1-2 Preventing static electricity ------------- 1-3 Precautions for Service ------------------ 1-4 Importance admistering point on the safety ----- 1-5

Area Suffix

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

Disassembly method -------------------- 1-6 Adjustment method ----------------------- 1-21 Description of major ICs ---------------- 1-25

No.A0008 Jun. 2001

XV-M50BK

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 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 current check (Electrical 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 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 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

0.15 F AC TYPE

1500 10W

Place this probe on each exposed metal part.

exceed 0.75 V AC (r.m.s.). This corresponds to 0.5

Good earth ground

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

XV-M50BK

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 next page.)

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. For specific details, refer to the replacement procedure in the text. 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

1-3

XV-M50BK

Precautions for Service

Handling of Traverse Unit and Laser Pickup

1. Do not touch any peripheral element of the pickup or the actuator.

2. The traverse unit and the pickup are precision devices and therefore must not be subjected to strong shock.

3. Do not use a tester to examine the laser diode. (The diode can easily be destroyed by the internal power supply of the tester.)

4. When replacing the pickup, after mounting a new pickup, remove the solder on the short land which is provided at the center of the flexible wire to open the circuit.

5. Half-fixed resistors for laser power adjustment are adjusted in pairs at shipment to match the characteristics of the optical block. Do not change the setting of these half-fixed resistors for laser power adjustment.

Destruction of Traverse Unit and Laser Pickup by Static Electricity

Laser diodes are easily destroyed by static electricity charged on clothing

or the human body. Before repairing peripheral elements of the traverse unit or pickup, be sure to take the following electrostatic protection:

1. Wear an antistatic wrist wrap.

2. With a conductive sheet or a steel plate on the workbench on which the traverse unit or the pick up is to be repaired, ground the sheet or the plate.

When you remove the traverse mechanism from the servo control substrate

The laser diode of pick-up might be destroyed by static electricity and set switch (S11) on the pick-up board on "SHORT" side, please before removing the card wire from connector (CN10). Moreover, please set switch (S11) on "OPEN" side after assembling and inserting the card wire in connector (CN10) without fail at times.

Traverse

mechanism

CN10

CN12

SWITCH S11

SHORT

OPEN

When you remove the pick-up from the traverse mechanism

The laser diode of the pick-up might be destroyed by static electricity, and solder with part a, please before extracting a flexible wire from connector (CN12). Moreover, please remove solder in part a after inserting a flexible wire in connector (CN12).

1-4

Pick-up

Traverse mechanism

Soldering part

Importance Admistering point on the Safety

F901

D954

D991

IC953

R960

D952

T901

B9015

Q991

D956

C978

C992

CP952

EP951

B9016

B9017

PC901

C982

PC902

L957

D957

C918

C987

L959

C984

K952

D911

C909

D910

R903

K953

CN981

B9018

C914

R904

C989

D908

D902

D904

B9030

C913

D903

K951

K902

B9024

HS901

B9019

B9020

B9023

IC901

C908

S1B

B9601

R908

C915

B9021

R906

R901

LEA10018-

B9022

C906

B9111

B9206

R907

R910

R911

C907

B9207

C916

C905

C912

1.6A/125V

FC902

C902

L901

D901

C911

B9025

B9801

B9501

B9201

B9102

B9202

B9203

CN971

B9031

B9005

B9008

B9004

B9006

B9113

CN961

B9003

C966

B9007

B9029

R957

B9002

Q953

D950

B9104

B9107

C969

B9001

B9013

B9101

R956

C962

R980

B9028

K954

L952

C974

C964

C973

D974

B9106

Q965

B9010

R953

D960

IC951

Q966

Q951

C965

B9105

D970

L955

R976

C995

L951

C979

CP951

C960

B9011

B9012

D973

D972

C963

R954

B9204

C996

B9301

D951

D953

C997

B9014

F901

FC901

XV-M50BK

P901

B9026

B9027

C904

CN952 CN951

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

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

1-5

XV-M50BK

Disassembly method

Main body

Removing the top cover (See Fig.1)

Remove the two screws A attaching the top cover on the back of the body.

Remove the four screws B attaching the top cover on both sides of the body.

Pull the lower parts of the top cover sides and remove the top cover in the direction of the arrow.

Removing the front panel assembly

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

Disconnect the wire from connector CN971 on the power supply board.

(See Fig.2 to 5)

Top cover

Power supply board

CN971

Fig.1

System control board

CN703

Disconnect the card wire from connector CN703 on the system control board.

Remove the three screws C attaching the front panel assembly on the bottom of the body.

Release the joint a on the bottom and the two joints b on both sides of the body. Remove the front panel assembly toward the front.

Front panel assembly

Fig.2

Joint a

Fig.3

Front panel assembly

1-6

Joint b

Fig.5Fig.4

XV-M50BK

Removing the rear panel (See Fig.6)

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

Remove the eleven screws D attaching the rear panel on the back of the body and detach the rear panel.

Removing the DVD changer mechanism assembly

(See Fig.7)

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

Remove the one screw E.

Disconnect the 9 pin wire from connector CN961 on the power supply board.

Power supply board

Fig.6

Rear panel

Video board

CN601

CN701

System control board

Disconnect the card wire from connector CN601 on the video board.

Disconnect the card wires from connector CN701 and CN702 on the system control board.

Remove the four screws F attaching the DVD changer mechanism assembly.

It is easy for removing the front panel assembly to remove the mechanism assembly though the mechanism assembly can be removed even in the state that the front panel assembly adheres.

CN961

DVD changer mechanism assembly

Fig.7

CN702

1-7

XV-M50BK

Removing the power supply board

(See Fig.8 and 9)

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

Disconnect the wire from connector CN971 on the power supply board (The wire is extending from the front panel assembly).

Disconnect the 9 pin wire from connector CN961 on the power supply board (The wire is extending from the DVD changer mechanism assembly).

Disconnect the wire from connector CN951 and CN952 on the power supply board (The wire is extending from the system control board).

Remove the screw D attaching the AC jack on the rear panel.

Remove the two screws G attaching the power supply board and detach the power supply board.

Power supply board

CN971

CN961

Rear panel

CN951,CN952

Front panel assembly

Fig.8

Rear panel

Fig.9

1-8

XV-M50BK

Removing the video board

(See Fig.10 and 11)

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

Disconnect the card wire from connector CN601 on the video board (The card wire is extending from the DVD changer mechanism assembly).

Disconnect the wire from connector CN704 on the system control board (The wire is extending from the video board).

Remove the three screws D attaching the video board on the rear panel. Pull out the video board from the rear panel.

Removing the system control board

(See Fig.12 and 13)

Prior to performing the following procedure, remove the top cover. The system control board can be removed even if the video board is attached.

Disconnect the card wire from connector CN703 on the system control board (The card wire is extending from the front panel assembly).

Rear panel

Front panel assembly

Power supply board

CN951,CN952

Fig.10

Rear panel

Fig.11

Rear panel

CN601

CN704

Video board

CN704

System control board

Video board

CN701

Disconnect the card wire from connector CN701 and CN702 on the audio board (The card wires are extending from the DVD changer mechanism assembly).

Disconnect the wire from connector CN704 on the system control board (The wire is extending from the video board).

Disconnect the wire from connector CN951 and CN952 on the power supply board (The wire is extending from the system control board).

Remove the screw H attaching the system control board.

Remove the four screws D attaching the system control board on the rear panel. Pull out the system control board toward the front.

Front panel assembly

Fig.12

Rear panel

Fig.13

CN703

System control board

CN702

1-9

XV-M50BK

Front panel assembly

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

Removing the front board

(See Fig.14 and 15)

Remove the two screws I on the back of the front panel assembly and remove the bracket from the front panel assembly.

Remove the seven screws J attaching the front board.

If necessary, unsolder FW803 and disconnect the wire.

Removing the STANDBY switch board

(See Fig.16)

Remove the two screws K on the back of the front panel assembly.

Front panel assembly

Front board

Bracket

Fig.14

FW803

Fig.15

If necessary, unsolder FW803 and disconnect the wire.

FW803

STANDBY switch board

Fig.16

1-10

XV-M50BK

DVD changer mechanism assembly

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

Removing the traverse mechanism control board (See Fig.17)

Disconnect the card wire from connector CN101 on the traverse mechanism control board on the bottom of the DVD changer mechanism assembly.

Remove the screw L attaching the traverse mechanism control board. Release the three parts e, f and g and remove the traverse mechanism control board.

Ejecting the DVD (See Fig.18 and 19)

DVD changer mechanism assembly

Par t

Fig.17

CN101

Par t

DVD traverse mechanism control board

When the DVD is set or the traverse mechanism is up.

The DVD tray can not be ejected when the traverse mechanism is up.

Bringing down the traverse mechanism as shown in the Fig.20

The motor pulley and the belt can be seen on the front side of the changer. Turn the motor pulley clockwise until the belt stops.

Pull the tray lock lever on the left side of the changer and draw the DVD tray.

Draw the DVD tray 1 to 3 as above.

Fig.18

Belt

Motor pulley

Draw the DVD tray.

Traverse mechanism

As the motor pulley is turned, the traverse mechanism lowers.

Fig.19

Tray stopper

Tray lock lever

1-11

XV-M50BK

DVD Changer Mechanism Section

Removing the DVD mechanism board (See Fig.1)

Remove the DVD changer mechanism assembly.

From bottom side the DVD changer mechanism assembly, remove the one screw A retaining the DVD servo control board. Disconnect the card wire from the connector CN101 on

3. the DVD servo control board. Disengage the one engagement a and two

4. engagements b , remove the DVD servo control board.

ATTENTION !

The laser diode of pick-up might be destroyed by static electricity and set switch (S11) on the pick-up board on "SHORT" side, please before removing the card wire from connector (CN101). Moreover, please set switch (S11) on "OPEN" side after assembling and inserting the card wire in connector (CN101) without fail at times.

Please refer to page 1-4 for a detailed content.

DVD servo

control board

CN101

Removing the DVD tray assembly (See Fig.2~4)

Remove the screw B retaining the Disc stopper

1. (See Fig.3). Remove the three screws C retaining the T.bracket

2. (See Fig.3). From the clamper base section c, remove both of the

3. edges fixing the rod(See Fig.2 and 3). Remove the screw D retaining the clamper assembly

4. (See Fig.3). From the left side face of the chassis assembly, remove

5. the one screw E retaining both of the return spring and lock lever(See Fig. 4). By removing the pawl at the section d fixing the return

6. spring, dismount the return spring(See Fig.4). Remove the three lock levers(See Fig.4).

Disc stopper

T.Bracket

Lod stopper (C/J version only)

Fig.1

Clamper base

Rod

T.Bracket

Fig.2

Return spring

Clamper assembly

1-12

Lock lever

Fig.4

Fig.3

XV-M50BK

8.9.Check whether the lifter unit stopper has been caught into the hole at the section e of DVD tray assembly as shown in Fig.5. Make sure that the driver unit elevator is positioned as shown in Fig.6 from to the second or fifth hole on the left side face of the DVD Traverse mechanism assembly.

[Caution]

10.

11.

12.

Chassis assembly

In case the driver unit elevator is not at above position, set the elevator to the position as shown in Fig.7 by manually turning the pulley gear as shown in Fig.8.

Manually turn the motor pulley in the clockwise direction until the lifter unit stopper is lowered from the section e of DVD tray assembly(See Fig.8). Pull out all of the three stages of DVD tray assembly in the arrow direction f until these stages stop (See Fig.6). At the position where the DVD tray assembly has stopped, pull out the DVD tray assembly while pressing the two pawls g and g' on the back side of DVD tray assembly(See Fig.9). In this case, it is easy to pull out the assembly when it is pulled out first from the stage DVD tray assembly.

Stopper

DVD tray assembly

Fig.5

Refer to Fig.7

Pulley gear

Pawl

DVD tray assembly

Drive unit of elevator

Fig.7Fig.6

DVD tray assembly

Fig.8

Motor pulley

Fig.9

Pawl ,

1-13

XV-M50BK

Removing the DVD mechanism

Cams R1, R2 assembly

assembly(See Fig.10)

1.2.While turning the cams R1 and R2 assembly in the arrow direction h , align the shaft i of the DVD mechanism assembly to the position shown in Fig.10. Remove the four screw F retaining the DVD mechanism assembly.

Arrow

Removing the DVD traverse mechanism

assembly (See Fig.11 and 12 )

For dismounting only the DVD mechanism without

1. removing the DVD mechanism assembly, align the shaft j of the DVD mechanism assembly to the position shown Fig.11 while turning the cam R1 and R2 assembly in the arrow direction k. Remove the two screws G raising the DVD mechanism

2. assembly. Remove the DVD traverse mechanism assembly in the

3. arrow direction I from the lifter unit (See Fig. 12)

DVD mechanism assembly

Cam R1, R2 assembly

Fig.10

DVD traverse mechanism assembly

Arrow

Lifter unit

Fig.11

Fig.12

Arrow

1-14

Removing the mechanism control

board (See Fig.14, 15)

Absorb the four soldered positions m of the right and left motors with a soldering absorber(See Fig.14).

Remove the two screws H retaining the mechanism control board(See Fig.14). Remove the two screws I retaining the tray select

3. switch board(See Fig.15).

Removing the cam unit (See Fig.15 18 )

Remove the DVD mechanism assembly.

While turning the cam gear L, align the pawl n position of the drive unit to the notch position(Fig.15) on the cam gear L. Pull out the drive unit and cylinder gear(See Fig.17).

3. While turning the cam gear L, align the pawl o position

4. of the select lever to the notch position(Fig.18) on the cam gear L. Remove the four screws J retaining the cam unit(cam

5. gear L and cams R1/R2 assembly)(See Fig.18).

Motor L

Mechanism control board

Fig.14

XV-M50BK

Motor R

Chassis assembly

CN801

Fig.15

CN802

Drive unit

CD Tray switch board

Cylinder gear

CN804

Drive unit

Cam gear L

Fig.16

Cams R1, R2 assembly

Cam unit

Fig.17

Select lever

Fig.18

1-15

XV-M50BK

Removing the actuator motor and belt (See Fig.19 22)

Remove the two screws K retaining the gear bracket (See Fig.19).

While pressing the pawl p fixing the gear bracket in the arrow direction, remove the gear bracket (See Fig.19). From the notch q section on the chassis assembly fixing

3. the edge of gear bracket, remove and take out the gear bracket(See Fig. 20). Remove the belts respectively from the right and left

4. actuator motor pulleys and pulley gears(See Fig. 19). After turning over the chassis assembly, remove the

5. actuator motor while spreading the four pawls r fixing the right and left actuator motors in the arrow direction(See Fig. 21).

[Note]

When the chassis assembly is turned over under the conditions wherein the gear bracket and belt have been removed, then the pulley gear as well as the gear, etc. constituting the gear unit can possibly be separated to pieces. In such a case, assemble these parts by referring to the assembly and configuration diagram in Fig. 22.

Pulley gear

Gear bracket

Belt

Motor pulley

Fig.19

Actuator motor

Pulley gear

Belt

Motor pulley

Pawl

Chassis assembly

Gear bracket

Fig.20

Assembly and Configuration Diagram

Pulley gear

Fig.21

Pulley gear

Gear B

Cylinder gear

1-16

Gear B

Gear C

Select gear

Gross gear L

Fig.22

Gross gear U

Gear C

XV-M50BK

Removing the cams R1/R2 assembly

and cam gear L (See Fig.23)

Remove the slit washer fixing the cams R1 and R2

1. assembly. By removing the two pawls s fixing the cam R1,

2. separate R2 from R1. Remove the slit washer fixing the cam gear L.

3. Pull out the cam gear L from the C.G. base assembly.

Removing the C.G. base assembly (See Fig.23 and 24)

Remove the three screws L retaining the C.G. base assembly.

[Caution]

To reassemble the cylinder gear, etc.with the

R1/R2

cam unit (cam gear and cams gear unit and drive unit, align the position of the pawl n on the drive unit to that of the notch on the cam gear L. Then, make sure that the gear unit is engaged by turning the cam gear L (See Fig. 24).

assembly),

Slit washer

Cam gear L

Slit washer

Cam R2

Pawl

Cam R1

Cam switch board

C.G. base assembly

Pawl

Notch

Pawl

Cylinder gear

Drive unit

Fig.23

Cam gear L

Cam R1, R2 assembly

Gear unit

Gear bracket

Fig.24

1-17

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