JVC XV-N50BK, XV-N55SL Service Manual

A0041200303

XV-N50BK,XV-N55SL

SERVICE MANUAL

DVD VIDEO PLAYER

XV-N50BK,XV-N55SL

TV DVD

STANDBY/ON

OPEN/

TV DVD

CLOSE

TV1 TV2 TV3

213

TV4 TV5 TV6

546

TV7 TV8 TV9

879

TV-/-- TV0 MUTING

010 +10

TITLE/
GROUP

U

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VOL VOL+

ENTER

C

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I

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SELECTCLEAR

-

SLOW

3D

PHONIC

SUB TITLE

ANGLE

AUDIO

REPEAT

DIMMER

TV/VIDEO
CANCELRETURN

N

O

NEXTPREVIOUS

SLOW+

PROGRESSIVE

Area Suffix (XV-N50BK)

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

Area Suffix (XV-N55SL)

J -------------------------- U.S.A.
C --------------------- Canada
B -------------------------- U.K.
E ------ Continental Europe
EN ------- Northern Europe
EV --------- Eastern Europe
EE ---- Russian Federation
UF ---------------------- China

M

E

N

U

N

E

E

R

C

S

VFPZOOM

SCAN

AMP
VOL

TABLE OF CONTENTS

1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED

No.A0041

2003/04

XV-N50BK,XV-N55SL

SPECIFICATION

General Readable discs DVD VIDEO, DVD-R (Video format), DVDRW(Video format),

+RW (Video format),SVCD, Video CD, Audio CD (CD-DA),MP3/WMAformat,
JPEG, CD-R/RW(CDDA,SVCD,Video CD, MP3/WMA format, JPEG)

Video format NTSC, 480i (Interlaced scan) / 480p(Progressive scan) selectable

Other Power requirements AC 120 V, 60 Hz

Power consumption 11 W (POWER ON), 0.7 W (STANDBYmode)
Mass 2.1 kg (4.7 lbs)
Dimensions (W xH x D) 435 mm x 45 mm x 270.5 mm (17-3/16 inch x 2-13/16 inch x 10-11/16 inch)

Video outputs COMPONENT (pin jacks) Y Output: 1.0 Vp-p (75 ohm)

PB/PR Output: 0.7 Vp-p (75 ohm)
VIDEO OUT (pin jack) 1.0 Vp-p (75 ohm)
S-VIDEO OUT (S jack) Y Output: 1.0 Vp-p (75 ohm)

C Output: 286 mVp-p (75 ohm)
Horizontal resolution 500 lines or more

Audio outputs ANALOG OUT (pin jack) 2.0 Vrms (10 kohm)

DIGITAL OUT (COAXIAL) 0.5 Vp-p (75 ohm termination)
DIGITAL OUT (OPTICAL) -21 dBm to -15 dBm (peak)

Audio characteristics Frequency response CD (sampling frequency 44.1 kHz):2 Hz to 20 kHz

DVD (sampling frequency 48 kHz):2 Hz to 22 kHz(4 Hz to 20 kHz for DTS and

Dolby Digital bitstream signals)

DVD (sampling frequency 96 kHz)2 Hz to 44 kHz
Dynamic range 16 bit: More than 98 dB

20/24 bit: More than 100 dB
Wow and flutter Unmeasurable (less than + 0.002%)
Total harmonic distortion less than 0.006%

• Specifications and appearance are subject to change without prior notice.

• Manufactured under license from Dolby Laboratories. “Dolby” and the double-D symbol are trademark of Dolby Laboratories.

• Manufactured under license from Digital Theater Systems, Inc. “DTS” and “DTS Digital Surround” are registered trademarks of
Digital Theater Systems, Inc.

1-2 (No.A0041)

SECTION 1

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

XV-N50BK,XV-N55SL

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)

(No.A0041)1-3

XV-N50BK,XV-N55SL

1.5 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.

1.5.1 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.

1.6 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) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

1-4 (No.A0041)

1.7 Importance admistering point on the safety

B4

EP951

C951

D960

CN901

C808

C802

Q951

B110

B202

B111

B112

B16

B17

B18

EP952 EP952 EP952 EP952 EP952 EP952 EP952 EP952 EP952 EP952 EP952

P901

R951

B129

B128

C904 C905

B402

R910

C918

FC901 FC902

L901

C902

B205

B303

B304

B13

B105

P704

B302

B14

D701

B15

C706

B204

XV-N50BK,XV-N55SL

L953

C963

B19

D956

B6

C908

C907

R901

B104

D901

D903

D902

IC901

C913

R912

C914

R913

R906

D904

R915

R903

PC901

B8

B9

B109

B12

B803

B10

B401

B11

X701

C701

D951

C906

C950

CP951

IC952

C970

B102

B7

B206

B501

B103

C965

C966

L954

C964

D954

D957

D955

C958

D953

C952

T901

C953

R954

D952

B301

B107

B101

B403

B106

CN904

C988

L955

C967

B207

B404

L952

L951

C955

B601

B603

C959

B801

B802

B901

B804

B902

C762

C761

CN651

J702

L709

L710

S902

B604

B3

S901

Q754

B201

Q753

J603

Full Fuse Replacement Marking

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

should be read as follows ;

FUSE CAUTION

WC802

B108

B203

EP953

C957

Q953

C973

B55

CN902 CN903

R966

B2

B1

WC801

B602

EP910

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

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

F901 : 1.6 A / 125 V F901 : 1.6 A / 125 V

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

(No.A0041)1-5

XV-N50BK,XV-N55SL

1.8 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.

(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.

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.

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.

REPRODUCTION AND POSITION OF LABEL and PRINT

WARNING LABEL and PRINT

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1-6 (No.A0041)

XV-N50BK,XV-N55SL

1.9 Precautions for Service

1.9.1 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) To replace the traverse unit, pull out the metal short pin for protection from charging.

(5) 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.

(6) 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.

1.9.2 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.

(3) Please be sure to make the switch of a relay board into the "SHORT" side before drawing out a wire from the connector CN101

on a servo control board,
when taking out a mechanism assembly from a main body.
And please be sure to make a switch into the "OPEN" side after connecting a wire to CN101, when it mounts a mechanism as-

sembly in a main body.
(4) After removing the flexible wire from the connector (CN1), short-circuit the flexible wire by the metal clip.
(5) Short-circuit the laser diode by soldering the land which is provided at the center of the flexible wire for the pickup.

After completing the repair, remove the solder to open the circuit.

The procedure for protecting a pickup

The switch on a relay board is
changed from "OPEN" to "SHORT."

Short circuit

A wire is extracted from the
connector CN101 on a servo control
board.

It solders to the short circuit part on a
flexible wire, and it is made to short­circuit.

A flexible wire is extracted from the
connector CN1 on a relay board.

In case you assemble, please do all work conversely.

Short circuit

CN1

Relay board

(No.A0041)1-7

XV-N50BK,XV-N55SL

TOP COVER

Push

SECTION 2

Disassembly method

2.1 Main body section

2.1.1 Removing the top cover (See Figure 1)

(1) Remove the two screws A attaching the top cover on both

sides of the main body.

(2) Remove the three screws B attaching the top cover on the

back of the main body.

(3) Raise the both sides and lower part of the rear of the top

cover, with opening them slightly in an outward direction.
And the top cover will be removed.

2.1.2 Removing the front panel assembly (See Figure 2, Figure 3, Figure 4)

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

• There is no need to remove the mechanism assembly.
(1) Insert a kind of screwdriver in a hole located in the right

side of mechanism assembly, and push a lever until it can­not be inserted any further.

(2) And then, a tray will come out. Remove the tray in an upper

direction, with slightly opening the lower part of fitting in an
outward direction.

(3) Disconnect the card wire from connector CN901 on the

power supply board.

(4) Hook a and b are removed respectively, and the front panel

assembly is removed.

Front panel assembly

Fitting

Tr ay

Mechanism assembly

A x 2

TOP COVER

TOP COVER

B

Fig.1

Front panel assembly

Power supply board

Fig.3

Hook b

Hook b

B

B

CN901

Hook a

1-8 (No.A0041)

Push

Fig.2

Hole and lever

Front panel
assembly

Hook a

Hook b

Fig.4

2.1.3 Removing the mechanism assembly (See Figure 2, Figure 5, Figure 6)

OPENSHORT

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

• There is no need to remove the front panel assembly.
(1) Insert a kind of screwdriver in a hole located in the right

side of mechanism assembly, and push a lever until it can­not be inserted any further. (See Figure 2)

(2) And then, a tray will come out. Remove the tray in an upper

direction, with slightly opening the lower part of fitting in an
outward direction. (See Figure 2)

(3) Remove the three screws C attaching the mechanism as-

sembly.
(4) The switch on a relay board is made into the “SHORT” side.
(5) Disconnect the card wire from connector CN101 on the

servo control and signal output terminal board.
(6) Remove the mechanism assembly by lifting the rear part of

the mechanism assembly.

ATTENTION:

Please be sure to make the switch on a relay board into a

Servo control and signal
output terminal board

“SHORT” side before disconnect a card wire from the connec­tor CN101 on servo control and signal output terminal board.
Moreover, please be sure to make a switch into the “OPEN”
side after inserting a card wire in a connector CN101 at the
time of an assembly.
There is a possiblity of destroying the laser diode of a pick-up
unit with static electricity.

Mechanism assembly

CN101

C

Switch

XV-N50BK,XV-N55SL

C

C

Fig.5

Mechanism assembly

2.1.4 Removing the relay board (See Figure 7)

• Prior to performing the following procedure, remove the mech­anism assembly.
(1) Remove the four screws D attaching the relay board.
(2) Disconnect the card wire from connector CN2,CN3 on the

relay board respectively.

(3) Disconnect the flexible wire from connector CN1 on the re-

lay board from pick-up unit.

ATTENTION:

At this time, please extract the wire after short-circuited
of two places on the wire in part c with solder. Please re­move the solder two places of part c after connecting the
wire with CN1 when reassembling.
There is a possibility of destroying the laser diode of a
pick-up unit with static electricity.

CN2
CN3

CN1

SHORT OPEN

OPEN

Relay board

Fig.6

Part c

D

D

Relay board

DD

Fig.7

(No.A0041)1-9

XV-N50BK,XV-N55SL

2.1.5 Removing the rear panel (See Figure 8, Figure 9)

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

(1) Remove the eight screws E attaching the rear panel.
(2) Disconnect the power cord from connector P901 on the

power supply board

(3) Remove tie band.

CN101

CN502

Servo control and signal
output terminal board

2.1.6 Removing the servo control and signal output terminal board. (See Figure 9)

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

(1) Remove the two screws F attaching the servo control and

signal output terminal board.

(2) Disconnect the card wire from connector CN101,CN502 on

the servo control and signal output terminal board.

(3) Disconnect the flat wire from connector CN902,CN903 on

the power supply board.

Rear panel

E E

F F

CN902,CN903

E

Fig.8

Fig.9

G CN901

Power supply board

G

G

P901

2.1.7 Removing the power supply board. (See Figure 9)

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

(1) Remove the three screws G attaching the power supply

board.

(2) Disconnect the wire from connector CN901,CN902,

CN903,CN904 on the power supply board.

(3) Disconnect the socket wire from socket P901 on the power

supply board.

1-10 (No.A0041)

2.2 Loading mechanism assembly

Projection of the tray

2.2.1 Removing the tray (See Figure 1, Figure 2, Figure 3, Figure 4, Figure 5, Figure 6)

(1) Push a of the slide cam on the hole in the right side of the

loading base by using a driver until it stops. (See Figure 1.)

(2) The tray comes out. Pull the tray in a front direction until it

stops.

(3) Remove the two screws A attaching the slide bracket. (See

Figure 2.)

(4) Tilt the tray in a direction of the arrow around the point in

the left rear part of the tray. (See Figure 3.)

(5) The rail of the tray is removed from b of the loading base.

Then, remove the tray upward. (See Figure 4.)

Attaching the tray:

Engage c of the loading base to the projection of the tray while
tilting the tray to the left. Turn the tray in a direction of the ar­row, and attach the slide bracket. (See Figure 5.)

Note:

Prior to the procedure above, move the slide cam in a direction
of the arrow so that d of the slide cam can be inserted in e of
the tray. (See Figure 6.)

Tray

XV-N50BK,XV-N55SL

Tray

The point in the left rear part

Fig.3

Push

Slide cam part a

Slide bracket

A

Fig.1

Fig.2

Loading base

A

Tray

Loading base part b

Projection of the tray

Projection of the tray

Loading base part c

Rail of the tray

Fig.4

Fig.5

Part e

Part d

Slide cam

Fig.6

(No.A0041)1-11

XV-N50BK,XV-N55SL

f

Shaft

2.2.2 Removing the traverse mechanism assembly (See Figure 7)

Reverse the loading mechanism assembly. Remove the four
screws B attaching the traverse mechanism assembly. Remove
the traverse mechanism assembly upward.

Loading mechanism

B

assembly

B

2.2.3 Removing the elevator (See Figure 8 and Figure 9)

• Prior to the following procedure, remove the traverse mecha­nism assembly.

(1) Remove the two arms of the elevator from the two parts f

by moving the arms in a direction of the arrow.

(2) Pull out the elevator in a rear direction.

Attaching the elevator:

Engage the two holes g to the two shafts on the front part of
the elevator. And then, attach the elevator.

Part f

Elevator

Traverse mechanism

B

assembly

Fig.7

Fig.8

g

B

Elevator

Part

Slide cam

g

1-12 (No.A0041)

Shaft

Shaft

Fig.9

2.2.4 Removing the loading motor (See Figure 10 and Figure 11)

• Prior to the following procedure, remove the tray, the traverse
mechanism assembly, and the elevator.
(1) Remove the belt from the pulley.
(2) Remove two screws C attaching the loading motor.
(3) Remove two solders h on the switch board.

Switch board

Pulley

Part h

Belt

C

Fig.10

Loading base

Pulley

C

Loading motor

XV-N50BK,XV-N55SL

Slide cam

Fig.11

(No.A0041)1-13

XV-N50BK,XV-N55SL

2.3 Traverse mechanism assembly

2.3.1 Removing the pickup (See Figure 12, Figure 13, and Figure 14)

• Prior to the following procedure, remove the traverse mecha­nism assembly.

(1) Remove one screw D attaching the plate.
(2) Remove the plate and the leaf spring.
(3) Lift i of the shaft 1, and pull out the shaft 1 from j.
(4) Remove k of the pickup from the shaft 2.

Attaching the pickup:

(1) Engage k of the pickup to the shaft 2.

Note:

As Figure 14 shows, the spring must come under the

shaft 2.
(2) Insert the shaft 1 in j, and attach the shaft 1 to i.
(3) Attach the leaf spring, and then attach the plate. Fix the

leaf spring and the plate by using the screw D.

Pick-up

Plate

D

Leaf spring

Fig.12

Part j

Shaft 1

Part k

Part i

Shaft 2

Fig.13

Spring

Shaft 2

Fig.14

1-14 (No.A0041)