Jvc XV-N44-SL Service Manual

A0040200303

XV-N40BK,XV-N44SL

SERVICE MANUAL

DVD VIDEO PLAYER

XV-N40BK,XV-N44SL

Area Suffix (XV-N40BK)

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

Area Suffix (XV-N44SL)

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

STANDBY/ON

OPEN/

CLOSE

DISPLAY

1

3

2

4

6

5

7

9

8

010 +10

TITLE/

CANCEL

GROUPRETURN

U

M

N

E

E

N

M

U

P

O

T

ENTER

C

N

H

E

O

E

R

I

C

C

E

S

N

O

NEXTPREVIOUS

SELECTCLEAR

-

SLOW

3D

PHONIC

SUB TITLE

ANGLE

VIDEO

SLOW+

VFP

REPEAT

PROGRESSIVE

SCAN

ZOOM

AUDIO

DIMMER

TABLE OF CONTENTS

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

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED.

No.A0040

2003/03

XV-N40BK,XV-N44SL

SPECIFICATION

General

Readable discs DVD VIDEO, DVD-R (Video format), DVDRW (Video format), +RW (Video format), SVCD, Video CD,

Audio CD (CD-DA), MP3 format, JPEG, CD-R/RW (CD-DA, SVCD, Video CD, MP3 format, JPEG)

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

Other

Power requirements AC 120 V, 60 Hz

Power consumption 10.4 W (POWER ON) 0.7 W (STANDBY mode)

Mass 2.1 kg (4.7 lbs)

Dimensions (W x H x D) 435mm x 53mm x 248.4mm (17-3/16 inch x 2-1/8 inc x 9-13/16 inch)

Video outputs

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

Pb/Pr Output: 0.7Vp-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 bit: More than 100 dB

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 trademarkes of Dolby Laboratories.

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

Digital output signal chart

Disc type Output

PCM ONLY DOLBY DIGITAL/PCM STREAM/PCM

DVD with 48/44.1 kHz,
16/20/24 bit linear PCM

DVD with 96 kHz,
16/22/24 bit linear PCM

DVD with DTS No output DTS bitstream

DVD with Dolby Digital 48 kHz, 16 bit, stereo linear PCM Dolby Digital bitstream

DVD with MPEG
Multichannel

SVCD/Video CD/Audio CD 44.1 kHz, 16 bit, stereo linear PCM

Audio CD with DTS No output DTS bitstream

CD-R/RW with MP3 Linear PCM

48 kHz, 16 bit, stereo linear PCM MPEG bitstream

48/44.1 kHz, 16 bit, stereo linear PCM

48kHz, 16 bit, stereo linear PCM (Down sampling)

1-2 (No.A0040)

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-N40BK,XV-N44SL

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.A0040)1-3

XV-N40BK,XV-N44SL

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.A0040)

1.7 Importance admistering point on the safety

XV-N40BK,XV-N44SL

J702

EP953

C966

C965

C964

L953

C963

D957

D956

T901

C908

C906

R901

C907

B234

R910

C904

C918

C905

L901

C902

L955

C967

L954

D954

B304

D903

D901

B631

C988

C958

D953

D955

R912

D902
C914

R915

C913

IC901

L951

C952

D951

R903

D904

R906

C955

B141

D952

PC901

R913

R954

C950

C970

CP951

B137

IC952

B34

Q951

R953

R951

B116

B135

B303

B37

B133

B134

C701

B38

B39

B132

B40

B202

B205

B231

B233

B105

C802

C808

B45

B107

B4

L710

L709

L952

B331

C953

R969

C951

B236

B403

B136

B271

B347

D701

X701

C706

B201

B142

B143

B2

B203

B102

B16

C959

B140

B852

B871

B874

B872

B166

B237

EP952

CN904

B36

B103

B101

B171

B44

P704

B41

CN901

S901

B273

B873

B772

B771

C973

C957

B601

Q953

B32

B332

R966

B272

B138

B139

B532

C977

L959

S902

C975

C976

L957

B15

B533

L956

B276

B333

C974

CN902

EP951

P901

FC901

FC902

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 ;

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 F901 : 1.6 A / 125 V

(No.A0040)1-5

XV-N40BK,XV-N44SL

1.8 Precautions for Service

1.8.1 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.

1.8.2 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) After removing the flexible wire from the connector (CN101), short-circuit the flexible wire by the metal clip.

(4) 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.

Short circuit

Short circuit

CN101

Servo control board

1-6 (No.A0040)

SECTION 2

TOP COVER

r

Push

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.

A x 2

TOP COVER

TOP COVER

XV-N40BK,XV-N44SL

B

B

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.

B

Fitting

Push

Front panel assembly

Fig.1

Front panel assembly

Tray

Fig.2

Mechanism assembly

Hole and leve

CN901

Power supply board

Fig.3

Hook b

Front panel
assembly

Hook b

Hook a

Fig.4

Hook a

(No.A0040)1-7

XV-N40BK,XV-N44SL

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

• 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.

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

sembly.

(4) Disconnect the wire from connector CN501,CN502,CN503

on the servo control board respectively.

(5) Remove the mechanism assembly by lifting the rear part of

the mechanism assembly.

2.1.4 Removing the servo control board (See Figure 6)

• Prior to performing the following procedure, remove the mech­anism assembly.
(1) Remove the three screws D attaching the servo control

board.

(2) Disconnect the card wire from connector CN201,CN202 on

the servo control board.

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

servo control 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 CN101 when reassembling.

CN502
CN503

CN202

CN201

CN101

Mechanism assembly

C

C

C

CN501

Fig.5

Part c

D

D

Servo control board

Fig.6

D

1-8 (No.A0040)

2.1.5 Removing the rear panel (See Figure 7, Figure 8)

• Prior to performing the following procedure, remove the top
cover.
(1) Remove the six screws E attaching the rear panel.
(2) Disconnect the power cord from connector P901 on the

power supply board

(3) Remove tie band.

E

G G

XV-N40BK,XV-N44SL

Rear panel

E E

Fig.7

CN901 P901

H

Tie band

Power cord

CN702

2.1.6 Removing the output terminal board and power supply board. (See Figure 8)

• Prior to performing the following procedure, remove the top
cover/mechanism assembly/rear panel.
(1) Remove the two screws G attaching the output terminal

board.

(2) Disconnect the card wire from connector CN702 on the

output terminal board.

(3) Remove the three screws H attaching the power supply

board.

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

power supply board.

Power supply boardOutput terminal board

Fig.8

H

H

(No.A0040)1-9

XV-N40BK,XV-N44SL

Projection of the tray

2.2 Loading mechanism assembly

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

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

1-10 (No.A0040)

Part d

Slide cam

Fig.6

2.2.2 Removing the traverse mechanism assembly (See Figure 7)

f

Shaft

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

XV-N40BK,XV-N44SL

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

Shaft

Shaft

Fig.9

(No.A0040)1-11

XV-N40BK,XV-N44SL

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

Slide cam

Fig.11

1-12 (No.A0040)

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

XV-N40BK,XV-N44SL

Plate

D

Leaf spring

Fig.12

Part j

Shaft 1

Part k

Part i

Shaft 2

Fig.13

Spring

Shaft 2

Fig.14

(No.A0040)1-13

XV-N40BK,XV-N44SL

SECTION 3

Adjustment

3.1 Test mode setting method

(1) Unplug the power plug.
(2) Insert power plug into outlet while pressing both "PLAY" key and "STOP" key of the main body.
(3) The FL display shows " 0", and the main body turns to test mode. " " means the destination, and "0" means parameter adjust-

ment status.

(4) To release test mode, press "POWER" key of the main body.

NOTE:

Each pressing of "CHOICE" key of the remote controller in test mode changes the mode as follows.

0 ------------------------------

_ ----------------------

Becames test mode

Version of firmware

FL Display becames all lighting

CK --------------------------------

EP -------------------------------

3.2 Method of displaying version of firmware

(1) Set the main body at test mode.
(2) Press "CHOICE" key of the remote controller once. Then, version number and alphabetical letter of the system controller and

the back end are displayed in the FL display as follows:

Check mode

Not used

FL Display (Example)

19_16

System controller

3.3 Initialization method

Please initialize according to the following procedures in the following case:

• Just after you upgrade the firmware.

• After you confirm the symptoms that a customer points out. First Initialize, and then confirm whether the symptoms are improved or
not.

• After servicing, before returning the main body to a customer. (Initialized main body should be returned to a customer.)
(1) Set the main body at test mode.
(2) Press "PAUSE" key of the main body.
(3) When initialization is completed, the FL display changes from " 0" to " 00".

(The left "0" of "00" is not always "0". It shows parameter adjustment status.)

Back end

OPEN/

CLOSE

1

4

7

U

N

E

M

P

O

T

C

H

O

I

C

E

SLOW

ANGLE

1-14 (No.A0040)

-

SUB TITLE

DISPLAY

PHONIC

ENTER

SELECTCLEAR

3D

STANDBY/ON

2

5

8

010 +10

TITLE/
GROUPRETURN

REPEAT

AUDIO

CANCEL

N

O

NEXTPREVIOUS

SLOW+

PROGRESSIVE

ZOOM

DIMMER

3

6

9

M

E

N

U

N

E

E

R

C

S

VFP

SCAN

CHOICE key
(switch of mode)

POWER key

FL Display

PLAY key

(for test mode)

STOP key

(for test mode)

PAUSE key

(for initialize)

XV-N40BK,XV-N44SL

3.4 All-initialization method

Please perform all-initialization according to the following procedures in the following case:

• Just after you exchange the pick-up.

• Just after you exchange the spindle motor.

• Just after you exchange the traverse mechanism base.

NOTE:

Please perform all-initialization when you exchange the parts above and also when you remove the parts above.

• Just after the flap adjustment of the pick-up guide shaft
(1) Set the main body at test mode.
(2) Press and hold "BACKWARD SKIP" key of the main body for more than 2 seconds.
(3) When all-initialization is completed, the FL display changes from " 0" to " 33".

NOTE:

After all-initialization, be sure to perform optimization adjustment of Front End parameter.

3.5 Optimization adjustment of Front End parameter

Adjustment to optimize Front End parameter must be performed in each mechanism assembly of this model for high-speed starting.
Please perform optimization according to the following procedures just after all-initialization is completed and when FL display shows
anything except " 0" (For example when FL display shows " 1", " 2", and " 3") at test mode.

(1) Press "POWER" key of the main body to turn the main body on (not to set the main body at test mode).
(2) Insert the test disc VT-501 or commercial dual-layer DVD software.
(3) Remove the disc when the FL display changes from "READ" to disc information.
(4) Perform the same procedures as in (2) and (3) above by using the test disc CTS-1000 or commercial CD-DA software.
(5) Set the main body at test mode, and check that the FL display shows " 0".

NOTE:

Status of this adjustment can be judged by the number displayed at test mode as follows:

DVD adjustment CD adjustment FL display at test mode

Adjusted Adjusted 0

Not adjusted Adjusted 1

Adjusted Not adjusted 2

Not adjusted Not adjusted 3

NOTE:

As for a disc used for adjustment,

• Disc should be mounted. ("Mounting" means to display "READ" after the disc is inserted and then display the disc informa­tion.) Disc need not be played.

• If you do not have test disc either VT-501 (DVD) or CTS-1000 (CD-DA), use a commercial disc (for DVD, dual-layer soft­ware) after seeing and checking that the disc is neither curved nor foreseen that it may shake at the time of playback.
If you use a disc with bad features, starting time may be slow or disc may not be read.

STANDBY/ON

OPEN/
CLOSE

DISPLAY

1

3

2

4

6

5

7

9

8

010 +10

TITLE/

CANCEL

GROUPRETURN

U

M

N

E

E

N

M

U

P

O

T

ENTER

C

N

H

E

O

E

R

I

C

C

E

S

N

O

NEXTPREVIOUS

SELECTCLEAR

-

SLOW+

SLOW

3D

VFP

REPEAT

PHONIC

PROGRESSIVE

SCAN

SUB TITLE

ANGLE

ZOOM

AUDIO

DIMMER

POWER key

FL Display

STOP key

(for test mode)

BACKWARD SKIP key

(for All initialize : It pushes 2 seconds or more.)

PLAY key

(for test mode)

(No.A0040)1-15

XV-N40BK,XV-N44SL

3.6 Display of current value of laser

(1) Set the main body at test mode.
(2) Press "CHOICE" key of the remote controller three times. Then, FL display is displayed "CK".
(3) The laser current value can be switched between the value of CD and that of DVD by pressing the following key of the remote

controller.

FL Display (Example)

2530

The number shown in the FL display shows mA of current value of laser.
The first two numbers ("25" in "2530") shows current value of laser at the time of adjustment after the latest all-initialization, 25mA
in this example.
The last two numbers ("30" in "2530") shows the present current value of laser, 30mA in this example.
The first two numbers ("25" in "2530") usually shows current value of laser at the time of shipment, so you can see how the prod­uct has been deteriorated by comparing the first two numbers ("25" in "2530") and the last two numbers ("30" in "2530").

CD:

The laser current value of 49 mA or less is normal.
The laser current value of over 50 mA is not normal. Laser diode of the pickup has been deteriorated.

DVD:

The laser current value of 64 mA or less is normal.
The laser current value of over 65 mA is not normal. Laser diode of the pickup has been deteriorated.

Remote controller "4" key --- Laser of CD
Remote controller "5" key --- Laser of DVD

To return to test mode, press "STOP" key of the main body.

3.7 Display of jitter value

(1) Set the main body at test mode.
(2) Press "CHOICE" key of the remote controller three times. Then, FL display is displayed "CK".
(3) Insert the test disk (VT-501), and press "PLAY" key of the main body.
(4) After a few seconds, press "6" of the remote controller. Then, the jitter value is displayed on the LCD display as follows.

FL Display (Example)

****

3.8 Flap adjustment of the pick-up guide shaft

Please perform flap adjustment of the pick-up guide shaft in the following case:

• Just after you exchange the pick-up.

• Just after you exchange the spindle motor.

• Just after you exchange the traverse mechanism base.

NOTE:

Please perform flap adjustment of the pick-up guide shaft when you exchange the parts above and also when you remove the
parts above.

• When the reading accuracy of the signal is bad (There is a block noise in the screen, Screen stops in the outer circumference of a
disc, etc.)

ATTENTION:

Adjustment procedures will be informed of you in JVC Service Bulletin.

4 key (laser of CD)

5 key (laser of DVD)

STANDBY/ON

OPEN/

CLOSE

DISPLAY

1

3

2

4

6

5

7

U

N

E

M

P

O

T

ENTER

C

H

O

I

C

E

SELECTCLEAR

-

SLOW

3D

PHONIC

SUB TITLE

ANGLE

6 key

9

8

010 +10

(display of jitter value)

TITLE/

CANCEL

GROUPRETURN

M

E

N

U

CHOICE key

N

E

E

R

C

S

(switch of mode)

N

O

NEXTPREVIOUS

SLOW+

VFP

REPEAT

PROGRESSIVE

SCAN

ZOOM

AUDIO

DIMMER

Reference values to judge whether the jitter is allowable or not are displayed,
instead of actual jitter values.

PLAY key

POWER key

FL Display

(for test mode and jitter value)

STOP key

(for test mode)

1-16 (No.A0040)

XV-N40BK,XV-N44SL

A

3.9 Upgrading of firmware

The latest firmware for upgrading is updated in "Optical disc CSG" page in JS-net.
At the time of service, compare the version of the product and the latest version, and upgrade the old version into the latest version.

(1) Press "POWER" key of the main body to turn the main body on
(2) Insert the upgrade disc.
(3) When FL display of the main body changes from "READ" to "UP", press "cursor UP" key ( ) of the remote controller.
(4) The entire screen becomes blue, and upgrading starts.
(5) The tray opens automatically. Remove the upgrade disc.
(6) The screen returns to the normal screen. Then, press "POWER" key of the main body. When the stand-by indicator is lighted,

upgrading is completed.

(7) Set the main body at test mode, and perform initialization. Then, confirm the version of the firmware.

Firmware upgrade Disc ... press UP

fter inserting the up-grade disc

STANDBY/ON

OPEN/
CLOSE

DISPLAY

1

4

7

U

N

E

M

P

O

T

ENTER

C

H

O

I

C

E

SELECTCLEAR

-

SLOW

3D

PHONIC

SUB TITLE

ANGLE

UP key
(for firmware upgrade)

3

2

6

5

9

8

010 +10

TITLE/

CANCEL

GROUPRETURN

M

E

N

U

CHOICE key

N

E

E

R

C

S

(switch of mode)

N

O

NEXTPREVIOUS

SLOW+

VFP

REPEAT

PROGRESSIVE

SCAN

ZOOM

AUDIO

DIMMER

Upgrade application initializing...

While upgrading (blue screen)

POWER key

FL Display

(for test mode)

OPEN/CLOSE key

NO DISC

When up-grade is completed

PLAY key

(for test mode)

STOP key

PAUSE key

(for initialize)

(No.A0040)1-17

XV-N40BK,XV-N44SL

3.10 Attention when pick-up is exchanged

(1) Flexible wire, pick-up spring, switch actuator, and lead

spring are removed from an old pick-up (broken the one).

Guide:

Flexible wire, pick-up spring and switch actuator,lead
spring are removed without each decomposing while as­sembled.

(2) The above-mentioned parts are installed in a new pick-up

(non-defective article).

(3) A flexible wire is inserted in the connector which has taken

side with the pick-up, and solder is put up to short land part
"a" two places on a flexible wire.

(4) The electrostatic breakdown protection circuit attached to

the pick-up is cut.

ATTENTION:

Please cut the electrostatic breakdown protection
circuit attached to the pick-up after solder is put up
to two places on a flexible wire short land part "a" of
the insertion of a flexible wire this time in the con­nector without fail.
The procedure might be mistaken and if solder has
not surely adhered to two places on a flexible wire
short land part "a", the laser diode in the pick-up be
destroyed again.

(5) The pick-up is installed in the traverse mechanism.

(6) A flexible wire is connected with connector CN101 on the

servo control board by installing the traverse mechanism in
the loading mechanism.

(7) Solder in two places on a flexible wire in part "a" is re-

moved.

Switch actuator

Lead spring

Pick-up spring

Flexible wire

Electrostatic breakdown

protection circuit

Pick-up

Flexible wire

Connector

Short land
part "a"

ATTENTION :

Please remove solder in two places in part "a" after
connecting a flexible wire with connector CN101 on
the servo control board without fail this time.
When the procedure is mistaken, the laser diode in
the pick-up might be destroyed.
Please remove solder in two places in part "a" sure­ly.

Cutting part

Electrostatic breakdown

protection circuit

Short land part "a"

CN101

1-18 (No.A0040)

Servo control board

XV-N40BK,XV-N44SL

3.11 Confirm method of operation

Please confirm the operation of the undermentioned item after doing the repair and the upgrade of the firmware.

Initialize Refer to the initialization method.

All-initialize Refer to the All-initialization method.

Parameter adjustment status Set the main body at test mode, and check that the FL display shows " 0".

Opening picture check (Power ON) It should be display "JVC"

Muting working The noise must not be had to the performance beginning when you push "PLAY" button or

at ON/STANDBY.

FL Display The mark and the logo, etc. displayed by each operation must be displayed correctly.

FL Display should light correctly without any unevenness.

All Function button All function buttons should worked correctly with moderate click feeling.

Open and close movement of tray When press OPEN/CLOSE button the tray should move smoothly without any noise.

Remote controller unit working Check the correctly operation in use of remote controller unit.

Reading of TOC Be not long in the malfunction.

Search Both forward-searches and backward-searches should be able to be done.

Do not stop be searching or after the search.

Skip Both forward-skip and backward-skip should be able to be done.

Do not stop be after the skip.

Playback Do not find abnormality etc. of tone quality and the picture quality.

Most outside TITLE playback check Play VT-501 TITLE 59 CHAPTER 1 , check normal playback.

(No.A0040)1-19

XV-N40BK,XV-N44SL

3.12Troubleshooting

3.12.1 Servo volume

Press OPEN
/CLOSE key

Is tray

operation

Confirmation of tray drive circuit

N

and circuit in surrounding

correct?

Y

Is the traverse moving
along the innermost

N

perimeter for SW detection?

Y

"NO DISC" message appears

Y

immediately after vertical
movement of the pick-up lens

N

The state that DISC does not rotate continues for
several seconds, and becomes NO DISC or an
error display afterwards.
The rotation of DISC becomes high-speed and
abnormal, and becomes NO DISC or an error
display afterwards.

N

Is focus retraction OK?

FE

OFF
Even when it retracts
correctly, if it is out of focus
and makes repeated retries
with a clicking sound, it is
in error.

ON

See "(4) Focus ON error"

N

in "Check points for
individual errors"

Y

Is tracking retraction OK?

See "(3) Traverse movement error"
in "Check points for individual errors"

See "(2) Disk detection, distinction error"
in "Check points for individual errors"

Y

See "(1) Spindle startup error"
in "Check points for individual errors"

Is the inter-layer jump OK?

FE

LO LI

A

Two layers of DVD only.

N

(8) Inter-layer

jump error

Y

TE

OFF

If TE waveform reappears
or fails to converge after the
TE retraction, it is in error.

Is the spindle servo

locked correctly?

Is the RF OUT waveform

locked correctly?

1-20 (No.A0040)

A

ON

See "(5) Tracking ON error"

N

in "Check points for
individual errors"

Has the disc information

been collected?

Stop will result

N

(7) Address read

error

Y

Y

Check (9),(10),(11), and

See "(6) Spindle CLV error"

N

in "Check points for
individual errors"

Is playback

possible?

Y

N

(12) items in "Check points
for individual errors"

Y

OK !

Fig.1