JVC XV-N420B, XV-N422S Service Manual
SERVICE MANUAL
DVD PLAYER
YD05420052
XV-N420B,XV-N422S
Area Suffix
US ----------------------- U.S.A.
UC ------------------- Canada
STANDBY/ON
OPEN/
CLOSE
+
SLOW
DISPLAYON SCREEN
T
O
T
P
H
U
M
B
N
A
IL
L
ENTER
S
NEXTPREVIOUS
SELECT
CLEAR
123
456
789
0
SOUND
VFP
EFFECT
I/P
SUBTITLEANGLE
AUDIO
ZOOM
/
IS
T
E
T
U
P
®
VIDEO
M
E
N
U
M
E
N
U
CANCEL RETURN
TITLE/
GROUP DIMMER
SLIDE EFFECT
XV-N420BUSC,XV-N420BUCC,XV-N422SUSC,XV-N422SUCC
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
COPYRIGHT © 2005 Victor Company of Japan, Limited
No.YD054
2005/2
SPECIFICATION
XV-N420B,XV-N422S for US,UC
General
Readable discs DVD VIDEO, DVD-R (Video format), DVD-RW (Video format), SVCD, Video CD, Audio CD (CD-DA),
CD-R/RW (CD-DA, SVCD, Video CD, MP3 format, JPEG)
Video format NTSC, 480i/480p selectable
Other
Power requirements AC 120 V~, 60 Hz
Power consumption 11.0 W (POWER ON), 1.0 W (STANDBY mode)
Mass 1.5 kg (3.3 lbs)
Dimensions (W × H × D) 435mm × 44mm × 203.5 mm (17-3/16 inch × 1-3/4 inch × 8-1/16 inch)
Video outputs
COMPONENT (pin jacks) Y Output: 1.0 Vp-p (75 Ω)
Pb/Pr Output: 0.7Vp-p (75 Ω)
VIDEO (pin jack) 1.0 Vp-p (75 Ω)
S-VIDEO (S jack) Y Output: 1.0 Vp-p (75 Ω)
C Output: 286 mVp-p (75 Ω)
Horizontal resolution 500 lines or more
Audio outputs
ANALOG OUT (pin jack) 2.0 Vrms (10 kΩ)
DIGITAL OUT (COAXIAL) 0.5 Vp-p (75 Ω termination)
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
Wow and flutter Unmeasurable (less than +- 0.002%)
Total harmonic distortion less than 0.009%
1-2 (No.YD054)
SECTION 1
PRECAUTION
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 F AC-type capacitor between an exposed metal part and a known good earth
ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
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.YD054)1-3
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.
1.7 Precautions of the safe use of battery
• Store the battery in a place where children cannot reach.If a child accidentally swallows the battery, consult a doctorimmediately.
• Do not recharge, short, disassemble or heat the battery or dispose of it in a fire.
Doing any of these things may cause the battery to give off heat, crack, or start a fire.
• Do not leave the battery with other metallic materials.Doing this may cause the battery to give off heat, crack, or start a fire.
• When throwing away or saving the battery, wrap it in tape and insulate; otherwise, the battery may start to give off heat, crack, or
start a fire.
• Do not poke the battery with tweezers or similar tools.Doing this may cause the battery to give off heat, crack, or start a fire.
• Dispose of batteries in the proper manner, according to federal, state, and local regulations.
1-4 (No.YD054)
1.8 Importance administering point on the safety
CN903
B918
B902
S501S502
B916
B915
S507
B912
B910
S506
R963
Q951
S508
C966
S503 S504
L955
S505
CN902
B908
B907
C985
C954
C964
L953
C955
D954
C957
D956
L954
C982
C956
D960
C950
R950
B701
B914
B913
EP902
B905
B904
CP950
CN901
B901
C959
C958
L952
L951
D953
C983
D955
B903
D957
D952
D951
L960
B730
B731
B712
B714
B704
B703
B702
B705
B710
B740
B906
L970
C902
B713
B706
B709
B708
B741
B919
B742
B743
B744
IC902
C905
PC901
R902
D906
C909
IC901
C908
D905
R901
T901
B917
D902
C907
C906
B716
B715
B717
B722
B718
C755
C756
B729
B711
CN905
B745
B728
B727
L709
L730
B760
B761
L706
B762
L701
B746
B747
L702
B748
B749
C903
C904
D903
L901
B723
B725
B719
B720
EP901
B721
B765
B764
B759
B763
B758
B757
B754
C730
B751
B752
B750
C901
P901
FC901
J901
C713
B724
B726
C712
C706
C707
B770
B767
B769
B768
B766
J601
CN904
B771
B756
L707
J703
J602
B753
B755
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 ;
F901 : 1.6 A / 125 V F901 : 1.6 A / 125 V
Marquage Pour Le Remplacement
Complet De Fusible
Le symbole graphique (Ce symbole signifie
fusible de type a fusion rapide.)
doit etre interprete comme suit ;
PRECAUTIONS SUR LES FUSIBLES
POUR UNE PROTECTION CONTINUE CONTRE
DES RISQUES D'INCENDIE, REMPLACER
SEULEMENT PAR UN FUSIBLE DU MEME TYPE ;
(No.YD054)1-5
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 clothingor 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) It solders to two short circuit sections on the substrate of a pick-up.
(4) After removing the flexible wire from the connector (CN101
(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 the flexible wire by the metal clip.
Pick-up
CN101Digital board
Short circuit
*Please refer to the disassembly method for details.
1-6 (No.YD054)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
(No.YD054)1-7
SECTION 3
TOP COVER
DISASSEMBLY
3.1 Main body section
3.1.1 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.
3.1.2 Removing the front panel assembly (See Figure 2)
• Prior to performing the following procedure, remove the top
cover.
• There is no need to remove the mechanism assembly.
(1) Hook a and b are removed respectively, and the front panel
assembly is removed.
A x 2
TOP COVER
TOP COVER
B
Front panel
assembly
Hook b
Fig.1
Hook b
Hook b
B
B
Hook a
Hook a
Fig.2
1-8 (No.YD054)
3.1.3 Removing the mechanism assembly (See Figure 3, Figure 4, Figure 5)
• Prior to performing the following procedure, remove the top
cover/front panel assembly.
(1) Remove the one screw C attaching the FL Display board
and lug wire.
(2) The tapes on mechanism assembly is peeled off and the
wire is taken.
(3) Disconnect the card wire from connector CN503
Display board.
(4) Remove the two screws D attaching the Clamper base.
(5) Disconnect the card wire from connector CN4
board.
(6) It solders to two c sections on the pick-up unit.
(7) Disconnect the card wire from connector CN201
on the digital board.
CN101
ATTENTION:
Please extract the wire after short-circuited of two places
on the pick-up unit in part c with solder. Please remove
the solder two places of part c after connecting the wire
with CN101
CAUTION:
Be sure to solder the short land sections “c” on the pickup unit before disconnecting the card wire from connector CN101
If the card wire is disconnected without attaching solder,
the pick-up unit may be destroyed by static electricity.
(8) Remove the three screws E attaching the mechanism as-
sembly.
(9) Remove the mechanism assembly by lifting the rear part of
the mechanism assembly.
when reassembling.
on the digital board.
on the FL
on the LED
, CN202,
CN201
D
Clamper base
Tape
E
E
CN202
Fig.3
Fig.4
D
Lug wire
E
Pick-up
C
CN503
FL Display board
CN4
LED board
CN101Digital board
Part c
Fig.5
(No.YD054)1-9
3.1.4 Removing the tray(See Figure 6, Figure 7)
• Prior to performing the following procedure, 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) A tray is made to slide ahead.
(3) Remove the two screws F attaching the shaft guide.
Tr ay
Push
Fig.6
Tr ay
F
F
3.1.5 Removing the rear panel (See Figure 8 )
• Prior to performing the following procedure, remove the top
cover.
(1) Remove the five screws G attaching the rear panel.
(2) Disconnect the power cord from connector P901
main board
on the
Shaft guide
Main board
P901
Fig.7
GG
Fig.8
1-10 (No.YD054)
3.1.6 Removing the digital board and main board. (See Figure 9 ,Figure 10)
• Prior to performing the following procedure, remove the top
cover/front panel assembly/rear panel.
(1) Remove the two screws H attaching the digital board.
(2) Disconnect the card wire from connector CN201
, CN301, CN302, CN303 on the digital board.
CN101
(3) Disconnect the card wire from connector CN903
main board.
(4) Remove the four screws I attaching the main board.
, CN202,
on the
CN301
CN302
I
CN202
H
CN303
Digital board
CN903
I
H
CN101
CN201
Fig.9
3.1.7 Remove the FL Display board (See Figure 11)
• Prior to performing the following procedure, remove the top
cover.
(1) Disconnect the card wire from connector CN501
on the FL Display board.
(2) Remove the two screws J attaching the FL Dispiay board.
, CN503
I
Main board
I
Fig.10
CN501
CN503
Fig.11
J
FL Display board
J
(No.YD054)1-11
3.2 Loading mechanism assembly
A
Shaft
3.2.1 Removing the traverse mechanism assembly (See Figure 1)
(1) Reverse the loading mechanism assembly.
(2) A card wire is removed from a wire bracket.
(3) Remove the four screws A attaching the traverse mecha-
nism assembly. Remove the traverse mechanism assembly upward.
Loading mechanism assembly
A
wire
bracket
3.2.2 Removing the elevator (See Figure 2 and Figure 3)
• Prior to the following procedure, remove the traverse mechanism assembly.
(1) Remove the two arms of the elevator from the two parts a
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 b to the two shafts on the front part of
the elevator. And then, attach the elevator.
A
Part a
A
Traverse mechanism assembly
Fig.1
Elevator
Part a
1-12 (No.YD054)
Elevator
Shaft
Fig.2
Fig.3
b
Slide cam
b
3.2.3 Removing the loading motor (See Figure 4 and Figure 5)
• 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 B attaching the loading motor.
(3) Remove two solders c on the switch board.
Pulley
Switch board Part
Belt
B
Fig.4
c
Loading base
Pulley
B
Loading motor
Slide cam
Fig.5
(No.YD054)1-13
3.3 Traverse mechanism assembly
3.3.1 Removing the pickup (See Figure 6, Figure 7)
• Prior to the following procedure, remove the traverse mechanism assembly.
(1) Remove one screw C attaching the plate.
(2) Remove the plate and the leaf spring.
(3) Lift d of the shaft 1, and pull out the shaft 1 from e.
(4) Remove f of the pickup from the shaft 2.
Attaching the pickup:
(1) Engage f of the pickup to the shaft 2.
(2) A spring is lifted and shaft 1 is inserted in the e, and at-
tach the shaft 1 to d.
(3) Attach the leaf spring, and then attach the plate. Fix the
leaf spring and the plate by using the screw C.
spring
C
Leaf spring
Plate
Fig.6
Part e
spring
Shaft 2
Part f
Shaft 1
Part d
Fig.7
1-14 (No.YD054)
SECTION 4
ADJUSTMENT
4.1 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 "N420 ∗∗ ", and the main body turns to test mode.
*The portion of "∗∗" changes with destinations.
(4) To release test mode, press "POWER" key of the main body.
NOTE:
Each pressing of "SET UP" key of the remote controller in test mode changes the mode as follows.
Message area of TV screen
N420 ---------------
-------------
-------------
-------------
Becomes test mode ----
Version of backend -----
Type of flash memory
Version of frontend -----
FL Display becomes all lighting
CHCK -------------------
Check mode --------------
TEST MODE
BE VERSION :
FE VERSION :
CHECK MODE
TV screen
TEST MODE
Message area
4.2 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 "FWD SKIP" key of the main body.
(3) When indicate "P" on the FL display, initialization is completed.
PLAY key
STANDBY/ON
OPEN/
CLOSE
+
SLOW
DISPLAYON SCREEN
T
O
P
M
E
N
U
ENTER
M
E
N
U
SELECT
CLEAR
123
456
789
CANCEL RETURN
0
SOUND
TITLE/
VFP
EFFECT
GROUP DIMMER
I/P
SUBTITLEANGLE
AUDIO
SLIDE EFFECT
T
H
U
M
B
N
A
IL
/
L
IS
T
SET UP key
S
E
T
U
P
(switch of mode)
NEXTPREVIOUS
ZOOM
POWER key
(for test mode)
FWD SKIP key
(for initialize)
STOP key
(for test mode)
FL Display
(No.YD054)1-15
4.3 Upgrading of firmware
The latest firmware for upgrading is updated in "Digital Video Storage" 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.
4.3.1 Distribution method
(1) Compressed file is distributed through JS-NET.
(2) Download the version of the destination of the model, and self-extract the file.
(3) "N420XXXX.rom" file is made.(The portion of “XXXX” may change with a model and destinations.)
(4) Write "N420XXXX.rom" file in the root of CD-R/RW. (Folders such as jvc_dvd are not necessary.)
4.3.2 Upgrade method
(1) Prepare upgrade disc with "N420XXXX.rom" file written in its root.
(2) Press "POWER" key of the main body to turn the main body on.
(3) Insert the upgrade disc.
(4) The contents of disc are read automatically and upgrade is started.
(5) TV screen 1/28,2/28... if the count-up is displayed and it becomes 28/28, it will be displayed on FL display as "DONE", and up-
grade will be completed.
(6) When upgrade finishes, the main body changes from the POWER ON mode to STANDBY mode.
(7) Press the "OPEN/CLOSE" key, and open the tray to eject the disc.
(8) Set the main body at test mode, and perform initialization. Then, confirm the version of the firmware.
1-16 (No.YD054)
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