JVC XV-N50BK User manual

SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED No.A0041
2003/04
XV-N50BK,XV-N55SL
DVD VIDEO PLAYER
A0041200303
XV-N50BK,XV-N55SL
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
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TV7 TV8 TV9
TV-/-- TV0 MUTING
TV DVD
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TV DVD
PROGRESSIVE
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TV1 TV2 TV3
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

XV-N50BK,XV-N55SL
1-2 (No.A0041)
SPECIFICATION
• 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.
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%

XV-N50BK,XV-N55SL
(No.A0041)1-3
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 man-
ufacturer. Replacement parts must be identical to those
used in the original circuits. Services should be per-
formed 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 characteris-
tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us-
ing replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special safety
characteristics are identified in the Parts List of Service Manu-
al. Electrical components having such features are iden-
tified by shading on the schematics and by ( ) on the
Parts List in the Service Manual. The use of a substitute re-
placement which does not have the same safety character-
istics as the recommended replacement parts shown in the
Parts List of Service Manual may create shock, fire, or oth-
er 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, particular-
ly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage cur-
rent 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
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 pre-
forming 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)

XV-N50BK,XV-N55SL
1-4 (No.A0041)
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.

XV-N50BK,XV-N55SL
(No.A0041)1-5
1.7 Importance admistering point on the safety
C701
C706
C761
C762
C902
C904 C905
C907
C908
C913
C914
C918
C950
C951
C952
C953
C955
C957
C958
C959
CN901
C963
C964
C965
C966
C967
C970
C973
C988
B112
CN904
CP951
B401
B201
D701
D901
D902
D903
D904
D951
D952
D953
D954
D955
D956
D957
D960
EP951
FC901FC902
IC901
IC952
J603 J702
L709
L710
L901
L951
L952
L953
L954
L955
P704
P901
PC901
Q753 Q754
Q951
Q953
R901
R903
R906
R910
R912
R913
R915
R951
R954
R966
S901
S902
T901
X701
CN651
EP910
B16
B17
B18
CN902 CN903
C906
B803
B301
B107
C808
B802
C802
B1
B4
B601
B9
B8
B12
B10
B11
B19
B104
B103
B7
B206
B501
B102
EP952EP952EP952EP952EP952EP952EP952EP952EP952EP952EP952
B302
B204
B303 B304
B202
B15
B105
B14
B111
B13
B110
B901
B902
B203
B804
B205
B101
B801
B602
B2
B129
B6
B207
B402
B404
B403
WC801
B109
WC802
B106
B108
B603
B604
B128
B55
EP953
B3
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 F901 : 1.6 A / 125 V
Marquage Pour Le Remplacement
Complet De Fusible
PRECAUTIONS SUR LES FUSIBLES
POUR UNE PROTECTION CONTINUE CONTRE
DES RISQUES D'INCENDIE, REMPLACER
SEULEMENT PAR UN FUSIBLE DU MEME TYPE ;
Le symbole graphique (Ce symbole signifie
fusible de type a fusion rapide.)
doit etre interprete comme suit ;

XV-N50BK,XV-N55SL
1-6 (No.A0041)
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 näkymät-
tömälle 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 avs-
lott. unngå utsettelse for stråling.
REPRODUCTION AND POSITION OF LABEL and PRINT
WARNING LABEL and PRINT
CAUTION: Invisible laser
radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE
TO BEAM. (e)
ADVARSEL: Usynlig laser-
stråling ved åbning, når
sikkerhedsafbrydere er ude
af funktion. Undgåudsæt-
telse for stråling (d)
VARNING: Osynlig laser-
strålning när denna del är
öppnad och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARO: Avattaessa ja suo-
jalukitusohitettaessa olet
alttiinan
äkymättömälle
lasersäteilylle. Älä katso
säteeseen. (f)
The inside of a chassis base

XV-N50BK,XV-N55SL
(No.A0041)1-7
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.
Short circuit
CN1
Relay board
Short circuit
The procedure for protecting a pickup
In case you assemble, please do all work conversely.
The switch on a relay board is
changed from "OPEN" to "SHORT."
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 short-
circuit.
A flexible wire is extracted from the
connector CN1 on a relay board.

XV-N50BK,XV-N55SL
1-8 (No.A0041)
SECTION 2
Disassembly method
2.1 Main body section
2.1.1 Removing the top cover (See Figure 1)
(1) Remove the two screws Aattaching the top cover on both
sides of the main body.
(2) Remove the three screws Battaching 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.
Fig.1
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 can-
not 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 aand bare removed respectively, and the front panel
assembly is removed.
Fig.2
Fig.3
Fig.4
B
B
B
Ax 2
TOP COVER
TOP COVER
TOP COVER
Front panel assembly
Mechanism assembly
Tray
Fitting
Hole and lever
Push
Push
Front panel assembly
Power supply board
CN901
Hook a
Hook a
Hook b
Hook b
Hook b
Front panel
assembly

XV-N50BK,XV-N55SL
(No.A0041)1-9
2.1.3 Removing the mechanism assembly (See Figure 2, Figure 5, Figure 6)
• 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 can-
not 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 Cattaching 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
“SHORT” side before disconnect a card wire from the connec-
tor 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.
Fig.5
Fig.6
2.1.4 Removing the relay board (See Figure 7)
• Prior to performing the following procedure, remove the mech-
anism assembly.
(1) Remove the four screws Dattaching 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 cwith solder. Please re-
move the solder two places of part cafter connecting the
wire with CN1 when reassembling.
There is a possibility of destroying the laser diode of a
pick-up unit with static electricity.
Fig.7
C
Mechanism assembly
Servo control and signal
output terminal board
C
C
CN101
Mechanism assembly
Switch
Relay board
OPEN
OPENSHORT
SHORT OPEN
CN3
D
Part c
CN2
CN1
Relay board DD
D

XV-N50BK,XV-N55SL
1-10 (No.A0041)
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 Eattaching the rear panel.
(2) Disconnect the power cord from connector P901 on the
power supply board
(3) Remove tie band.
Fig.8
Fig.9
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 Fattaching 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.
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 Gattaching 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.
E
Rear panel
E E
G
Power supply board
F F
G
P901
CN902,CN903
Servo control and signal
output terminal board
G CN901
CN101
CN502

XV-N50BK,XV-N55SL
(No.A0041)1-11
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 aof 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 Aattaching 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 bof the loading base.
Then, remove the tray upward. (See Figure 4.)
Attaching the tray:
Engage cof the loading base to the projection of the tray while
tilting the tray to the left. Turn the tray in a direction of the ar-
row, 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 dof the slide cam can be inserted in eof
the tray. (See Figure 6.)
Fig.1
Fig.2
Fig.3
Fig.4
Fig.5
Fig.6
Tray
Push
Loading base
Slide cam part a
Tray
AA
Slide bracket
Tray
The point in the left rear part
Loading base part bRail of the tray
Projection of the tray
Projection of the tray
Projection of the tray
Loading base part c
Slide cam
Part d
Part e

XV-N50BK,XV-N55SL
1-12 (No.A0041)
2.2.2 Removing the traverse mechanism assembly (See Figure 7)
Reverse the loading mechanism assembly. Remove the four
screws Battaching the traverse mechanism assembly. Remove
the traverse mechanism assembly upward.
Fig.7
2.2.3 Removing the elevator (See Figure 8 and Figure 9)
• Prior to the following procedure, remove the traverse mecha-
nism 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 gto the two shafts on the front part of
the elevator. And then, attach the elevator.
Fig.8
Fig.9
Loading mechanism
assembly B
B
BB
Traverse mechanism
assembly
Part fPart
f
Elevator
Slide cam
Shaft
Shaft
Shaft
Elevator
g
g

XV-N50BK,XV-N55SL
(No.A0041)1-13
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 Cattaching the loading motor.
(3) Remove two solders hon the switch board.
Fig.10
Fig.11
Loading base
Slide cam
Belt
Pulley Pulley
CC
Loading motor
Switch board Part h

XV-N50BK,XV-N55SL
1-14 (No.A0041)
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 mecha-
nism assembly.
(1) Remove one screw Dattaching the plate.
(2) Remove the plate and the leaf spring.
(3) Lift iof the shaft 1, and pull out the shaft 1from j.
(4) Remove kof the pickup from the shaft 2.
Attaching the pickup:
(1) Engage kof the pickup to the shaft 2.
Note:
As Figure 14 shows, the spring must come under the
shaft 2.
(2) Insert the shaft 1in 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.Fig.12
Fig.13
Fig.14
Leaf spring
D
Plate
Shaft 1
Part j
Part i
Shaft 2
Part k
Pick-up
Spring
Shaft 2

XV-N50BK,XV-N55SL
(No.A0041)1-15
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.
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:
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" and a progressive indicator lights up.
(The left "0" of "00" is not always "0". It shows parameter adjustment status.)
Becames test mode
Version of firmware
Check mode
Not used
0 ------------------------------
_ _ -------------
FL Display becames all lighting
CHECK -------------------------
EXPERT -----------------------
Back end
System controller 04_02_17
FL Display (Example)
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TITLE/
GROUP TV/VIDEO CANCELRETURN
VOL VOL+
CH
+
CH
VFPZOOM
AMP
VOL
AUDIO
3D
PHONIC
SUB TITLE ANGLE
DIMMER
REPEAT
OPEN/
CLOSE
TV4 TV5 TV6
TV7 TV8 TV9
TV-/-- TV0 MUTING
TV DVD
NEXTPREVIOUS
SELECTCLEAR
SLOW
- SLOW+
T
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N
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N
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N
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N
C
H
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ENTER
STANDBY/ON
TV DVD
PROGRESSIVE
SCAN
TV1 TV2 TV3
CHOICE key
(switch of mode)
POWER key
STOP key
(for test mode)
PLAY key
(for test mode)
PAUSE key
(for initialize)
Progressive indicator
(for initialize)
FL Display

XV-N50BK,XV-N55SL
1-16 (No.A0041)
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:
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 informa-
tion.) 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 soft-
ware) 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.
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
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TITLE/
GROUP TV/VIDEO CANCELRETURN
VOL VOL +
CH
+
CH
VFPZOOM
AMP
VOL
AUDI O
3D
PHONIC
SUB TITLE ANGLE
DIMMER
REPEAT
OPEN/
CLOSE
TV4 TV5 TV6
TV7 TV8 TV9
TV-/-- TV0 MUTING
TV DVD
NEXTPREVIOUS
SELECTCLEAR
SLOW
- SLOW+
T
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N
U
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N
U
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C
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N
C
H
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ENTER
STANDBY/ON
TV DVD
PROGRESSIVE
SCAN
TV1 TV2 TV3
STOP key
(for test mode)
PLAY key
(for test mode)
POWER key FL Display
BACKWARD SKIP key
(for All initialize : It pushes 2 seconds or more.)

XV-N50BK,XV-N55SL
(No.A0041)1-17
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 "CHECK".
(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.
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 prod-
uct 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.
To return to test mode, press "STOP" key of the main body.
3.7 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.)
00002530
FL Display (Example)
Remote controller "4" key --- Laser of CD
Remote controller "5" key --- Laser of DVD
POWER key
STOP key
(for test mode)
PLAY key
(for test mode and jitter value)
FL Display
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TITLE/
GROUP TV/VIDEO CANCELRETURN
VOL VOL+
CH
+
CH
VFPZOOM
AMP
VOL
AUDIO
3D
PHONIC
SUB TITLE ANGLE
DIMMER
REPEAT
OPEN/
CLOSE
TV4 TV5 TV6
TV7 TV8 TV9
TV-/-- TV0 MUTING
TV DVD
NEXTPREVIOUS
SELECTCLEAR
SLOW
- SLOW+
T
O
P
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N
U
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N
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N
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C
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N
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H
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ENTER
STANDBY/ON
TV DVD
PROGRESSIVE
SCAN
TV1 TV2 TV3
CHOICE key
(switch of mode)
4 key (laser of CD)
5 key (laser of DVD)
1 key (automatic adjustment)
6 key
(display of jitter value)

XV-N50BK,XV-N55SL
1-18 (No.A0041)
3.7.1 Tool for adjustment
*Stud: One set (four studs), Part number: JIGXVS40 (Note: One of the four studs is not used here.)
3.7.2 Preparation for adjustment
(1) See the disassembly procedure, and remove the Mechanism assembly from the main body.
(2) Remove the relay board attached to the mechanism assembly.
(If you disconnect the wires connected to the Relay board, connect them again.)
(3) Attach the three studs to the Mechanism assembly.
(4) Put the Mechanism assembly in the center of the main body, and connect the 50 pin wire from the connector CN4 on the
Relay board to the connector CN101 on the Servo control & signal output terminal board.
3.7.3 Adjustment
(1) Set the unit to test mode.
(2) Press the "CHOICE" key of the remote controller three times, and the FL display is displayed "CHECK".
(3) Insert a test disc (VT-501), and press the numeric key "1" of the remote controller for automatic adjustment.
(4) After a few seconds, press the numeric key "6" of the remote controller. Then, the FL display displays a jitter value.
(5) Turn the adjustment screws on the underside of the traverse mechanism with phillips screw driver until the maximum jitter value
is displayed on the FL display. (In this model, a bigger jitter value means a better result.)
NOTE:
During operation, the switch on the Relay board should be switched to "OPEN".
Reference values to judge whether the jitter is allowable or not are displayed, instead of actual jitter values.
POINT:
Turn the adjustment screws a and b to the same angle in the
right direction. And turn the adjustment screws a and b to the
same angle in the left direction. Then, turn the screws a and b
in either the right or the left direction to increase the number of
jitter. Don't turn the adjustment screw c.
Stud
S
tud
Stud
Mechanism
assembly
Relay board
CN4
Switch
OPEN SHORT
OPEN SHORT
OPEN SHORT
Relay board
CN4
Mechanism assembly
CN101
Servo contro &
signal output
terminal board
Screw
a
Screw
b
Screw
c

XV-N50BK,XV-N55SL
(No.A0041)1-19
3.8 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.
When up-grade is completed
Upgrade application initializing...
While upgrading (blue screen)
A
fter inserting the up-grade disc
Firmware upgrade Disc ... press UP
NO DISC
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TITLE/
GROUP TV/VIDEO CANCELRETURN
VOL VOL+
CH
+
CH
VFPZOOM
AMP
VOL
AUDIO
3D
PHONIC
SUB TITLE ANGLE
DIMMER
REPEAT
OPEN/
CLOSE
TV4 TV5 TV6
TV7 TV8 TV9
TV-/-- TV0 MUTING
TV DVD
NEXTPREVIOUS
SELECTCLEAR
SLOW
- SLOW+
T
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P
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N
U
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N
U
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N
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C
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E
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N
C
H
O
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C
E
ENTER
STANDBY/ON
TV DVD
PROGRESSIVE
SCAN
TV1 TV2 TV3
POWER key
STOP key
(for test mode)
PLAY key
(for test mode)
PAUSE key
(for initialize)
Progressive indicator
(for initialize)
FL Display
CHOICE key
(switch of mode)
OPEN/CLOSE key
UP key
(for firmware upgrade)

XV-N50BK,XV-N55SL
1-20 (No.A0041)
3.9 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 as-
sembled.
(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 con-
nector 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.
ATTENTION :
Please remove solder in two places in part "a" after
connecting a flexible wire with connector CN1 on the
relayl 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" sure-
ly.
Switch actuator
Lead spring
Pick-up
Pick-up spring
Flexible wire
Flexible wire
Connector
Short land
part "a"
Electrostatic breakdown
protection circuit
Electrostatic breakdown
protection circuit
Cutting part
Short land
part "a"
CN1
Relay board