JVC XV-N420B User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.YD054
2005/2
DVD PLAYER
YD05420052
XV-N420B,XV-N422S
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
Area Suffix
US ----------------------- U.S.A.
UC ------------------- Canada
XV-N420BUSC,XV-N420BUCC,XV-N422SUSC,XV-N422SUCC
VIDEO
®
OPEN/
CLOSE
LIST
SETUP
CLEAR
SLOW
+
DISPLAY ON SCREEN
ENTER
STANDBY/ON
VFP
I/P
CANCEL RETURN
SOUND
EFFECT
TITLE/
GROUP DIMMER
AUDIO
SUBTITLEANGLE
SLIDE EFFECT
ZOOM
123
456
789
0
THUMBNAIL/
TOP
MENU
MENU
NEXTPREVIOUS SELECT

1-2 (No.YD054)
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 Ωtermination)
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%

(No.YD054)1-3
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purpos-
es. 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 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 Ser-
vice 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 charac-
teristics 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 reassem-
bling.
(5) Leakage shock hazard testing)
After reassembling the product, always perform an isola-
tion check on the exposed metal parts of the product (an-
tenna 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 sensi-
tivity in the following manner. Connect a 1,500 ohm 10W
resistor paralleled by a 0.15 F AC-type capacitor be-
tween 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)

1-4 (No.YD054)
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.

(No.YD054)1-5
1.8 Importance administering point on the safety
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 ;
B905
C706
C707
C712
C713
C730
B724
C901
C902
C903 C904
C905
C906
C907
C908
C909
C950
C954
C955
C956
C957
C958
C959
C964
C966
C982
C983
C985 CN901
CN902
CN903
B752
CN905
B916
D902
B915
D906
D951 D952
D953
D954
D955
D956
D957
D960
EP902
FC901
FC902
IC901
IC902
J601
J602
J703
J901
L701
L702
L706
L707
L709
L730
L901
L951
L952
L953
L954
L955
L960
P901
PC901
Q951
B731
B730
R901
R902
R950
S501S502 S503 S504
S505 S506 S507
S508
B711
T901
B770
B725
L970
B755
B768
B757
D903
C756
C755
B751
B910
R963
B726
B716
B754
B763
B767
B750
B769
B908
B753
B766
B912
B746
B745
B719
B758
B759
B748
B903
B747
B904
B913
B756
B917
B901
B914
B702
B919
B705
B703
B740
B744
B902
B765
B762
B918
B715
D905
B727
B717
B704
B712
B743
B706
B749
B722
B710
B709
B718
B906
B764
B761
B760
CN904
B721
B720
B723
B729
B742
B907
B741
B708
B701
B714
B713
B728
B771
CP950
EP901

1-6 (No.YD054)
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), 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.
*Please refer to the disassembly method for details.
CN101Digital board
Pick-up
Short circuit

(No.YD054)1-7
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-8 (No.YD054)
SECTION 3
DISASSEMBLY
3.1 Main body section
3.1.1 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
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 aand bare removed respectively, and the front panel
assembly is removed.
Fig.2
B
B
B
Ax 2
TOP COVER
TOP COVER
TOP COVER
Hook a
Hook a
Hook b
Hook b
Front panel
assembly
Hook b

(No.YD054)1-9
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 Cattaching 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 on the FL
Display board.
(4) Remove the two screws Dattaching the Clamper base.
(5) Disconnect the card wire from connector CN4 on the LED
board.
(6) It solders to two csections on the pick-up unit.
(7) Disconnect the card wire from connector CN201, CN202,
CN101 on the digital board.
ATTENTION:
Please extract the wire after short-circuited of two places
on the pick-up unit in part cwith solder. Please remove
the solder two places of part cafter connecting the wire
with CN101 when reassembling.
CAUTION:
Be sure to solder the short land sections “c” on the pick-
up unit before disconnecting the card wire from connec-
tor CN101 on the digital board.
If the card wire is disconnected without attaching solder,
the pick-up unit may be destroyed by static electricity.
(8) Remove the three screws Eattaching the mechanism as-
sembly.
(9) Remove the mechanism assembly by lifting the rear part of
the mechanism assembly.
Fig.3
Fig.4
Fig.5
D
DClamper base CN503
Tape Lug wire FL Display board
C
E
E
E
CN4
LED board
CN202
CN201
CN101Digital board
Pick-up
Part c

1-10 (No.YD054)
3.1.4 Removing the tray(See Figure 6, Figure 7)
• Prior to performing the following procedure, remove the mech-
anism 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 Fattaching the shaft guide.
Fig.6
Fig.7
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 Gattaching the rear panel.
(2) Disconnect the power cord from connector P901 on the
main board
Fig.8
Tray
Push
F
Tray
F
Shaft guide
Main board
GG
P901

(No.YD054)1-11
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 Hattaching the digital board.
(2) Disconnect the card wire from connector CN201, CN202,
CN101, CN301, CN302, CN303 on the digital board.
(3) Disconnect the card wire from connector CN903 on the
main board.
(4) Remove the four screws Iattaching the main board.
Fig.9
Fig.10
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, CN503
on the FL Display board.
(2) Remove the two screws Jattaching the FL Dispiay board.
Fig.11
Digital board
CN303
CN202
CN302 H
H
CN101
CN201
CN301
Main board I
I
I
CN903
I
CN501
JJ
FL Display board
CN503

1-12 (No.YD054)
3.2 Loading mechanism assembly
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 Aattaching the traverse mecha-
nism assembly. Remove the traverse mechanism assem-
bly upward.
Fig.1
3.2.2 Removing the elevator (See Figure 2 and Figure 3)
• Prior to the following procedure, remove the traverse mecha-
nism 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 bto the two shafts on the front part of
the elevator. And then, attach the elevator.
Fig.2
Fig.3
Loading mechanism assembly
A
A
A
Traverse mechanism assembly
wire
bracket
A
Part aPart a
Elevator
Slide cam b
b
Shaft
Shaft
Elevator

(No.YD054)1-13
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 Battaching the loading motor.
(3) Remove two solders con the switch board.
Fig.4
Fig.5
Loading base
Slide cam
Belt
B
B
Pulley Pulley
Loading motor
Switch board Part c

1-14 (No.YD054)
3.3 Traverse mechanism assembly
3.3.1 Removing the pickup (See Figure 6, Figure 7)
• Prior to the following procedure, remove the traverse mecha-
nism assembly.
(1) Remove one screw Cattaching the plate.
(2) Remove the plate and the leaf spring.
(3) Lift dof the shaft 1, and pull out the shaft 1from e.
(4) Remove fof the pickup from the shaft 2.
Attaching the pickup:
(1) Engage fof the pickup to the shaft 2.
(2) A spring is lifted and shaft 1is 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.
Fig.6
Fig.7
C
Plate
Leaf spring
spring
Part d
Shaft 1
Shaft 2 Part f
Part e
spring

(No.YD054)1-15
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.
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.
Becomes test mode ----
Version of backend -----
Type of flash memory
Version of frontend -----
Check mode --------------
N420 ---------------
-------------
-------------
-------------
FL Display becomes all lighting
CHCK -------------------
Message area of TV screen
TEST MODE
BE VERSION :
FE VERSION :
CHECK MODE
TEST MODE
Message area
TV screen
OPEN/
CLOSE
LIST
SETUP
CLEAR
SLOW
+
DISPLAY ON SCREEN
ENTER
STANDBY/ON
VFP
I/P
CANCEL RETURN
SOUND
EFFECT
TITLE/
GROUP DIMMER
AUDIO
SUBTITLEANGLE
SLIDE EFFECT
ZOOM
123
456
789
0
THUMBNAIL/
TOP
MENU
MENU
NEXTPREVIOUS SELECT
SET UP key
(switch of mode)
POWER key
STOP key
(for test mode)
FWD SKIP key
(for initialize)
PLAY key
(for test mode)
FL Display

1-16 (No.YD054)
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.

(No.YD054)1-17
4.4 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.
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.

1-18 (No.YD054)
SECTION 5
TROUBLESHOOTING
5.1 Servo volume
Fig.1
FE
OFF ON
TE
OFF ON
FE
LO LI
OK !
Y
Y
A
N
N
N
N
Y
Y
N
N
Y
N
Y
Y
A
Y
Y
Y
N
N
N
Two layers of DVD only.
Is the inter-layer jump OK?
(8) Inter-layer
jump error
Has the disc information
been collected?
Stop will result
(7) Address read
error
Is playback
possible?
Press OPEN
/CLOSE key
Confirmation of tray drive circuit
and circuit in surrounding
See "(2) Disk detection, distinction error"
in "Check points for individual errors"
Is tray
operation
correct?
Is the traverse moving
along the innermost
perimeter for SW detection?
"NO DISC" message appears
immediately after vertical
movement of the pick-up lens
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.
Is focus retraction OK?
Even when it retracts
correctly, if it is out of focus
and makes repeated retries
with a clicking sound, it is
in error.
Is tracking retraction OK?
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?
See "(6) Spindle CLV error"
in "Check points for
individual errors"
See "(5) Tracking ON error"
in "Check points for
individual errors"
See "(4) Focus ON error"
in "Check points for
individual errors"
See "(1) Spindle startup error"
in "Check points for individual errors"
See "(3) Traverse movement error"
in "Check points for individual errors"
Check (9),(10),(11), and
(12) items in "Check points
for individual errors"

(No.YD054)1-19
5.2 Check points for each error
5.2.1 Spindle start error
(1) Defective spindle motor
• Are there several ohms resistance between each pin of CN201 "2-3","3-4","2-4"?
(The power supply is turned off and measured.)
(2) Defective spindle motor driver (IC201)
• Has motor drive voltage of a sine wave or a rectangular wave gone out to each terminal(UOUT,VOUT,WOUT)
of CN201"2,3,4" and IC201"19,18,17"?
• Is FG pulse output from the terminal of IC201"41"(FG) according to the rotation of the motor?
(3) Has the control signal come from the microcomputer?
• Is it "H" while the terminal of IC201"48"(MUTE1) is operating?
• Is the control signal input to the terminal of IC201"25"(SPDRV)?
• Is the SVREF voltage input to the terminal of IC201"26"(VREF)?
(4) Is the FG signal input to the servo IC?
• Is FG pulse input to the terminal of IC301"175"(FGIN) according to the rotation of the motor?
5.2.2 Disc Detection, Distinction error (no disc, no RFENV)
• Laser is defective.
• Front End Processor is defective (IC101).
• APC circuit is defective. --- Q101, Q102.
• Pattern is defective. --- Lines for CN101 - All patterns which relate to pick-up and patterns between IC101
•IC101 --- For signal from IC101 to IC301, is signal output from IC101 "40" (FE)?
5.2.3 Traverse movement NG
(1) Defective traverse driver
• Has the voltage come between terminal of CN201 "7" and "8" ?
(2) Defective BTL driver (IC201)
• Has the motor drive voltage gone out to IC201"11" or "14"?
(3) Has the control signal come from the microcomputer?
• TRSDRV Is the signal input? (IC301 "161")
(4) TRVSW is the signal input to microcomputer? (IC301 "177")
5.2.4 Focus ON NG
• Is FE output ? --- Pattern, IC101
• Is FODRV signal sent ? (R275) --- Pattern, IC301 "160"
• Is driving voltage sent ?IC101 "3", "4" --- If NG, pattern, driver, mechanical unit .
• Mechanical unit is defective.
5.2.5 Tracking ON NG
• When the tracking loop cannot be drawn in, TE shape of waves does not settle.
• Mechanical unit is defective.
Because the self adjustment cannot be normally adjusted, the thing which cannot be normally drawn in is thought.
• Periphery of driver (IC201)
Relative component or IC it self is defective.
• Microcomputer (IC301)
When improperly adjusted due to defective IC.

1-20 (No.YD054)
5.2.6 Spindle CLV NG
•IC101 -- "55"(DIN), "54(DIP).
• Does not the input or the output of driver's spindle signal do the grip?
• Has the tracking been turned on?
• Spindle motor or driver is defective.
• Additionally, "IC101 and IC301" and "Mechanism is defective(jitter)", etc. are thought.
5.2.7 Address read NG
• Besides, the undermentioned cause is thought though specific of the cause is difficult because various factors are thought.
Mechanism is defective. (jitter)
IC301
The disc is dirty or the wound has adhered.
5.2.8 Between layers jump NG (double-layer disc only)
• Mechanism defective
• Defect of driver's IC(IC201)
• Defect of microcomputer(IC301)
5.2.9 Neither picture nor sound is output
(1) It is not possible search
• Has the tracking been turned on?
• To "(5.2.5) Tracking ON NG" in "Check points for each error" when the tracking is not normal.
• Is the feed operation normal?
To "(5.2.3) traverse movement NG" in "Check points for each error" when it is not normal.Are not there caught of the feeding
mechanism etc?
5.2.10 Picture is distorted or abnormal sound occurs at intervals of several seconds.
• Is the feed operation normal?
• Are not there caught of the feeding mechanism etc?
5.2.11 Others
• The image is sometimes blocked, and the image stops.
• The image is blocked when going to outer though it is normal in surroundings in the disk and the stopping symptom increases.
There is a possibility with bad jitter value for such a symptom.
5.2.12 CD During normal playback operation
(1) Is TOC reading normal?
• Displays total time for CD-DA.
• Shifts to double-speed mode for V-CD
(2) Is playback afterwards possible?
(3) When can not do a normal playback
• --:-- is displayed during FL search.
According to [It is not possible to search ] for DVD(9), check the feed and tracking systems.
• No sound is output although the time is displayed.(CA-DA)
DAC, etc, other than servo.
• The passage of time is not stable, or picture is abnormal.(V-CD)
• The wound of the disc and dirt are confirmed.