Jvc XV-LTR1 Service Manual
SERVICE MANUAL
DVD VIDEO PLAYER
XV-LTR1
Area Suffix
J --------- U.S.A.
XV-LTR1
Contents
Safety precautions ------------------------ 1-2
Preventing static electricity ------------- 1-3
Importance admistering
point on the safety ------------ 1-4
Precautions for service ----------------- 1-5
This service manual is printed on 100% recycled paper.
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
Disassembly method -------------------- 1-6
Adjustment method ---------------------- 1-15
Troubleshooting -------------------------- 1-19
Description of major ICs ---------------- 1-23
No.A0020
Nov. 2001
XV-LTR1
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 current check (Electrical 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 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.).
0.15 F AC TYPE
1500 10W
Good earth ground
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
Place this
probe on
each exposed
metal part.
!
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.
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.
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 J and C version)
1-2
XV-LTR1
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.
1.1. 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.
1.1.1. Ground the workbench
1. 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.
1.1.2. Ground yourself
1. Use an anti-static wrist strap to release any static electricity built up in your body.
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
1.1.3. Handling the optical pickup
1. 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.)
2. 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.
1.2. 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. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it
1-3
XV-LTR1
Importance Admistering point on the Safety
PC902
D910
FC901
F901
FC902
R904
R908
J702
C904
P901
B7053
B7052
D901
C902
L901
C907
C905
R905
R907
B7314
B7211
R906
C906
C914
D908
PC901
R910
HS901
K902
B7054
IC901
C913
R903
B7140
D904
C918
D911
C916
B7037
B7040
D951
Q991
R960
R954
C992
B7041
D991
CP951
C960
C962
D960
L951
Q953
B7046
D950
R980
B7044
B7043
Q951
B7045
R956
R953
B5511
B7126
B7125
D31
PC30
J691
L710
B7058
B7313
R911
D903
R901
C909
B7320
D952
B7038
C963
C964
EP951
D30
B5719
CN702
Q744
L709
C737
B7124
B5512
C12
C908
C13
Q1
C984
D902
L957
T901
C982
C987
B7051
D956
D957
D954
D953
B7039
D973
C979
C965
L955
C997
L952
B7042
IC951
B7319
C966
B5701
B7049
C969
CP952
IC953
C978
B7131
B7130
B7129
B7127
B5720
B7128
B7329
B7048
C697
B7034
Q754
C738
B7036
CN555
C11
Q965
C989
L959
C15
L1
B5710
C17
D974
D972
Q966
R976
C996
C995
B5721
B7050
DI801
C821
C695
B7311
C696
B7209
B7210
Q611
B7312
R1731
Q601
D609
R606
C973
B5201
B5153
L612
L602
L611
D970
L601
L2
B7405
B7802
B5202
B7214
C16
C14
B5301
B5156
B5509
B7601
B5513
B5102
CN961
B5151
B5709
B5302
B7803
B5154
B5502
B5203
B7406
B5715
B7602
B5515
B5501
B5116
B7806
S691
B7123
B7139
C694
B7208
R616
D619
L621
B5155
B5303
B7315
RA703
B7607
B7207
B7502
B7122
B7035
R636
R650
Q621
B7033
D629
Q631
D639
L622
L632
L631
B7410
B5101
B7212
B5304
B7407
B7408
J604
B7029
B7030
B7309
B7403
B7032
B7951
B7801
B7206
B7120
,B7119
C985
B5110
B5111
B5112
B5113
B5114
B7604
B7213
B7316
RA702
B7031
B7402
B7308
B7307
B7136
B7221
B7306
B7305
B5517
B7135
B5152
R1732
B5104
CN701
B5205
B5503
B5504
B5505
B5506
B5713
B7411
B7412
B7416
B7413
B7415
B7414
B7133
B7409
B7809
B7808
B7807
B5305
B7317
RA701
J602
C609
C619
C747
C659
B7025
B7114
B7116
B7115
B7023
B7203
B7204
B7132
B7137
B7810
B7304
B7142
B7222
B7606
B7501
C745
B7401
D791
D792
B7022
C761
B7219
B7218
B5115
B7134
B7011
B7010
B7326
B7012
B7327
B7325
B7328
B7056
B7003
B7002
B7001
B7007
B7004
B7005
B7006
C728
B7217
X701
J601
C756
C757
C649
Q753
Q743
B7028
C746
B7201
B7202
B7057
B7303
B7302
B7301
B7113
C744
C749
C762
B7021
C741
C740
R745
B7016
B7009
B7008
B7141
B7013
C729
B7014
B7026
B7112
C742
R740
B7015
IC702
C629
C739
C755
C772
C754
C752
R755
R750
R753
R751
R752
C714
R741
C721
R743
C716
R742
C715
B7321
D701
C701
B7322
B7107
B7330
D709
R1730
B7111
B7324
B5707
B5708
B5704
B5703
C421
B5507
B5702
B5107
CN703
J703
C707
C1701
J603
T701
B7024
C750
C751
C730
C717
B7605
C711
B5514
B7055
B5108
B5109
D702
B7117
C1702
B7118
C771
C718
C731
K709
EP711
B7020
B7608
B5714
B7105
B7102
B7104
B7019
B7103
B7106
B5105
B7101
B7018
B5157
B7017
B5718
B5705
B5706
C422
B5508
B5106
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 ;
1-4
Precautions for Service
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.
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:
XV-LTR1
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.
Please refer to "Fig.4" of "Disassembly
method" for details.
Short circuit
Servo control
board
1-5
XV-LTR1
Disassembly method
<Main body>
Removing the top cover (see Fig.1)
1.Remove the two screws A attaching the top cover
on both sides of the body.
2.Remove the three screws B attaching the top
cover on the back of the body.
3.Remove the top cover from the body by lifting
the rear part of the top cover.
ATTENTION: Do not break the front panel tab
fitted to the top cover.
Removing the mechanism assembly
(see Fig.2,3)
* Prior to performing the following procedure, remove
the top cover.
* There is no need to remove the front panel assembly.
1.Remove the three screws C attaching the mechanism
assembly on the bottom chassis.
2.Remove the two screws F attaching the lug wire and
main board on the bottom chassis.
3.The servo control board is removed from the
connector CN961 and CN701 connected with the
main board respectively.
A x 2
F
Lug wire
CN703
Main board
Servo control board
B
Mechanism assembly
C
Fig.1
C
C
F
Fig.2
Mechanism
assembly
B
B
CN702
4.Remove the mechanism assembly by lifting the rear
part of the mechanism assembly.
Removing the servo control board
(see Fig.4)
* Prior to performing the following procedure, remove
the top cover and mechanism assembly.
1.Disconnect the card wire from connector CN201 and
CN202 on the servo control board respectively.
2.Disconnect the flexible wire from connector CN101
on the servo control board from pick-up.
< ATTENTION >
At this time, please extract the wire after short-circuited
of two places on the wire in part a with solder.
Please remove the solder two places of part a after
connecting the wire with CN101 when reassembling.
3.Two places in hook b are removed, the servo control
board is lifted, and it is removed.
Hook b
CN701
Fig.3
Fig.4
CN961
Main board
Hook b
Servo control
board
1-6
Removing the rear panel (see Fig.5)
XV-LTR1
*Prior to performing the following procedure, remove
the top cover.
1.Remove the four screws D attaching the rear panel
on the back of the body.
Removing the front panel assembly
(see Fig.6,7)
* Prior to performing the following procedure, remove
the top cover.
* There is no need to remove the mechanism assembly.
1.Remove the one screw E attaching the front panel
assembly on the bottom chassis.
2.Disconnect the wire from CN702 and CN703 on the
main board respectively.
3.Hook c and d are removed respectively, and the front
panel assembly is removed.
Front panel
assembly
Hook d
D
Hook c
Rear panel
D
D
Fig.5
Hook d
E
Fig.6
Removing the main board (see Fig.8)
* Prior to performing the following procedure, remove
the top cover, mechanism assembly and rear panel.
1.Disconnect the wire from CN702 and CN703 on the
main board respectively.
2.Remove the four screws F attaching the main board
on the bottom chassis.
F
Mechanism assembly
CN703
Main board
F
CN703
Fig.7
Main board
CN702
F
CN702
Fig.8
F
1-7
XV-LTR1
<Loading assembly section>
Removing the clamper assembly
(See Fig.1)
1.
Remove the four screws A attaching the clamper
assembly.
2.
Move the clamper in the direction of the arrow to
release the two joints a on both sides.
ATTENTION:
When reattaching, fit the clamper to
the two joints a.
Removing the tray (See Fig.2 and 3)
Prior to performing the following procedure, remove
the clamper assembly.
1.
Push b of the slide cam into the slot on the left side
of the loading base until it stops.
2.
Draw out the tray toward the front.
Joint a
A
Joint a
A
AA
Fig.1
ATTENTION:
Before reattaching the tray, slide the
part c of the slide cam to the right as
shown in Fig.3.
Clamper base
Push
Tray
b
Fig.2
Par t c
Slide cam
Fig.3
1-8
Removing the traverse mechanism
assembly (See Fig.4 and 5)
XV-LTR1
Prior to performing the following procedure, remove
the clamper assembly and the tray.
1.
Remove the four screws B attaching the traverse
mechanism assembly.
ATTENTION:
Before reattaching the traverse
mechanism assembly, pass the card
wire extending from the spindle motor
board through the notch d of the
elevator.
Removing the elevator (See Fig.6 and 7)
Prior to performing the following procedure, remove
the clamper assembly, the tray and the traverse
mechanism assembly.
1.
Extend each bar e inside of the loading base
outward and detach the elevator shaft.
B
Traverse mechanism
assembly
B
B
BB
BB
Fig.4
Traverse mechanism assembly
BB
Elevator
Notch d
ATTENTION:
Elevator
When reattaching, first fit the two
shafts on the front of the elevator to
the slots f of the slide cam.
Shafts
Slide cam
Elevator
Fig.5
e
Elevator
Elevator
Loading base
Slots f
e
Fig.6Fig.7
1-9
XV-LTR1
Removing the motor assembly
(See Fig.8 and 9)
Prior to performing the following procedure, remove
the clamper assembly, the tray, the traverse
mechanism assembly and the elevator.
1.
Remove the belt from the pulley.
2.
Remove the screw C attaching the motor assembly.
3.
Turn over the body and remove the screw D
attaching the motor assembly.
4.
Release the two tabs g retaining the motor board.
Belt
C
Motor assembly
Fig.8
Tabs g
Motor assembly
D
Loading base
Fig.9
1-10
XV-LTR1
Pulley gear
Pulley gear bracket
Motor assembly
Pulley gear bracket
E
Idle gear
Fig.10
Idle gear
Pulley gear
Tads h
Pulley gear
Removing the Idle gear / pulley gear /
middle gear / slide cam (See Fig.10 to 12)
Prior to performing the following procedure, remove
the clamper assembly, the tray, the traverse
mechanism assembly, the elevator and the motor
assembly.
1.
Press the two tabs h inward and pull out the idle
gear.
2.
Remove the screw E attaching the pulley gear
bracket. Slide the pulley gear bracket in the direction
of the arrow and pull out the pulley gear.
3.
Slide the slide cam in the direction of the arrow to
release the two joints i and remove upward.
4.
Remove the middle gear.
Slide cam
Joint i
Slide cam
Middle gear
Joint i
Fig.11
Middle gear
Fig.12
Loading base
1-11
XV-LTR1
<Traverse mechanism assembly section>
Removing the feed motor assembly
(See Fig.13)
1.
Unsolder the two soldering j on the spindle motor
board.
2.
Remove the two screws F attaching the feed motor
assembly.
Removing the feed motor
(See Fig.13 to 15)
Prior to performing the following procedure, remove
the feed motor assembly.
1.
Remove the screw G attaching the thrust spring.
Feed motor assembly
F
F
Notch k
Soldering j
Spindle motor board
Pickup
Spindle motor
Fig.13
Feed gear (M)
Thrust spring
ATTENTION:
2.
Remove the feed gear (M).
3.
Pull out the feed gear (E) and the lead screw.
4.
Remove the two screws H attaching the feed motor.
ATTENTION:
When reattaching the thrust spring,
make sure that the thrust spring
presses the feed gear (M) and the feed
gear (E) reasonably.
When reattaching, pass the two cables
extending from the feed motor through
the notch k of the feed holder as
shown in Fig.13.
G
Lead screw
Feed gear (E)
Fig.14
Feed motor
1-12
Feed holder
H
Fig.15
XV-LTR1
Removing the pickup (See Fig.16 and 17)
1.
Remove the screw I attaching the T spring (S) and
the shaft holder. Remove also the plate.
ATTENTION:
2.
Pull out the part l of the shaft upward. Move the part
m in the direction of the arrow and detach from the
spindle base.
3.
Disengage the joint n of the pickup and the shaft in
the direction of the arrow.
4.
Pull out the shaft from the pickup.
5.
Remove the two screws J attaching the actuator.
6.
Disengage the joint of the actuator and the lead
spring. Pull out the lead spring.
When reattaching, make sure that the
T spring (S) presses the shaft.
Shaft holder
I
Plate
T spring (S)
Lead spring
Pickup
Joint n
Part m
Part l
Fig.16
Actuator
J
Actuator
Lead spring
Shaft
Spring
The spring must be under the shaft when you
install pick-up.
Removing the shaft holder / shaft
(See Fig.18)
1.
Remove the screw K attaching the shaft holder.
2.
Remove the shaft.
Pick-up
Pickup
K
Shaft
Fig.17
Shaft
Shaft holder
Fig.18
1-13
XV-LTR1
Removing the spindle motor assembly
(See Fig.19 to 21)
1.
Remove the three screws L attaching the spindle
motor on the bottom of the mechanism base.
ATTENTION:
2.
Remove the three screws M attaching the spindle
base.
When reattaching, pass the card wire
extending from the spindle motor
board through the notch of the spindle
base.
L
L
Spindle motor assembly
Spindle motor
Fig.19
Spindle base
L
Fig.20
M
M
Spindle base
Mechanism base
Fig.21
1-14
Adjustment method
(1) Initialization method
If microprocessor (IC401,IC402,IC403) or pick-up is replaces, initialize the
DVD player in the following matter
1)Take out the disc and close the tray.
2)Unplug the power plug.
3)Insert power plug into outlet while pressing both "PLAY" button and "OPEN/CLOSE" button.
4)FL Display indicate "TEST " . :Version, :Region code
5)Press "3D-PHONIC" button of remote controller. and EEPROM initialize start.
6)When indicate "DTS" on the display, initialize finishes.
7)The power is turned OFF, and Unplug the power plug.
(2) Display of "Laser current value" and "Jitter value"
"Laser current value" and "Jitter value" are displayed on the FL display by the undermentioned
method. Please refer to the failure diagnosis.
1)Take out the disc and close the tray.
2)Unplug the power plug.
3)Insert power plug into outlet while pressing both "PLAY" button and "OPEN/CLOSE" button.
4)FL Display indicate "TEST " . :Version, :Region code
5)Press the "OPEN/CLOSE" button to move the tray outward.
Put the test disc (VT-501) on the tray and press "OPEN/CLOSE" button.
The tray should move inward (Note:Don't push to close the tray directly by hand etc.)
6)Press the "PLAY" button.
7)The laser current value and the jitter value is displayed on the FL indicator as follows.
XV-LTR1
FL Display
* The test mode is canceled when
0 0 4 0 3 9 7 8
Laser current value Jitter value
the power is turned off.
For Laser current value
The laser current value becomes 40mA for the above-mentioned.
Becomes a test mode by doing above-mentioned procedure 1) - 4). Afterwards, the laser current value can
be switched by pushing the button to remote controller without turning on the disk.
Remote control "4" button --- Laser of CD
Remote control "5" button --- Laser of DVD
If the laser current value is 64mA or less, it is roughly good. There is a possibility to which pick-up is
deteriorated, and exchange pick-up, please when there are 65mA or more laser current value.
3D PHONIC
Button (Initialize start)
5 Button
(Laser of DVD)
4 Button
(Laser of CD)
POWER Button
DTS Display part
(Initialize complete)
*Returns to a usual test mode by the
thing to push the "STOP" button of
remote controller.
OPEN/CLOSE
Button(Test mode)
FL Display
PLAY Button
(Test mode & display of jitter)
1-15
XV-LTR1
For Jitter value
The jitter value is displayed on the FL display referring to the previous page.
The jitter value is displayed by the hexadecimal number.
In the following cases, please "Flap adjustment of the pick-up guide shaft" referring to the following page.
Before using the TEST disc VT-501, careful check it if there is neither damage nor dirt on the read surface.
< In the following cases, please adjustment >
* When you exchange the pick-up
* When you exchange the spindle motor
* When the reading accuracy of the signal is bad (There is a block noise in the screen etc..)
3D PHONIC
Button (Initialize start)
5 Button
(Laser of DVD)
4 Button
(Laser of CD)
DTS Display part
(Initialize complete)
POWER Button
FL Display
OPEN/CLOSE
Button(Test mode)
PLAY Button
(Test mode & display of jitter)
1-16
(3) Flap adjustment of the pick-up guide shaft
<Tool list for adjustment>
* Hex wrench for adjustment
Off-the-shelf (1.3mm)
* Test disc
VT-501 or VT-502
* Stud (four pieces set)
Parts No. : JIGXVS40 (One is not used though there are four. )
* Assistance board and extension cord
Parts No. : EXTXVS40MK2CB
1
EXTXVS40MK2CB-1 MAIN CONNECT
Parts No. : EXTXVS40CB
3
2
EXTXVS40MK2CB-2 CONTROL CONNECT
XV-S40
MAIN CONNECT
XV-LTR1
Parts No. : EXTXV521CB
<Connection diagram>
MAIN CONNECT
4
5
XV-521 CN601
XV-521 CN503
6
CONT CONNECT
To CN701 of main board
EXTXVS40MK2CB-1 MAIN CONNECT
1
3
XV-S40 CONTROL CONNECT
CN701 XV-521
XV-521 CN502
CONT CONNECT
MAIN CONNECT
MAIN CONNECT
CN706 XV-521
CN501 XV-521
CONT CONNECT
To CN961 of main board
4
MAIN CONNECT
6
These parts are not used.
XV-521 CN601
2
EXTXVS40MK2CB-2 CONTROL CONNECT
To CN503 of servo control board
5
CONT CONNECT
XV-521 CN503
To CN502 of servo control board
1-17
XV-LTR1
<Adjustment preparation>
1.The mechanism assembly is made in the state from the main body from which is detached referring to the
disassembly method.
2.Three studs are installed in the mechanism assembly respectively.
3.The servo control board is removed from the mechanism assembly, and puts into the state set up as shown
in figure. (Each wire connected by the servo control board this time leaves the connection maintained.)
Between shaft and hook of mechanism assembly of figure Board is put.
4.The extension cord is inserted in the connector of the assistance board respectively.
The main board is connected with the servo control board as shown in figure.
Mechanism
assembly
Extension
cord
Stud
Main board
Servo control board
Assistance
board
Extension
cord
Shaft & hook
Stud
Assistance
board
Assistance
board
Extension
cord
Shaft & hook
Assistance
board
Servo control board
Extension
cord
Assistance
board
<Adjustment>
1.Puts into the state to display the jitter value on the FL display referring to "Display of the jitter value".
2.The adjustment screw under the traverse mechanism is turned with hex wrench, and matches so that the
jitter value displayed on the FL display may become "maximum" value.
1-18
Adjustment screw a Adjustment screw b
Adjustment
screw c
<POINT>
1.Turns in the forward or the opposite direction,
and makes to the position where the jitter value
is good the half rotation of adjustment screw a
and b(180 degrees) respectively.
2.Afterwards, adjustment screw b and c are turned
in the same way, and makes to the best position.
Troubleshooting
Servo volume
Press OPEN
/CLOSE key
XV-LTR1
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.
ON
Y
Is the spindle servo
locked correctly?
Is the RF OUT waveform
locked correctly?
Y
A
See "(5) Tracking ON error"
N
in "Check points for
individual errors"
See "(6) Spindle CLV error"
N
in "Check points for
individual errors"
Has the disc information
been collected?
Stop will result
Y
Is playback
N
possible?
Y
OK !
N
(7) Address read
error
Check (9),(10),(11), and
(12) items in "Check points
for individual errors"
1-19
XV-LTR1
Check points for each error
(1) Spindle start error
1.Defective spindle motor
*Are there several ohms resistance between each pin of CN201 "5-6","6-7","5-7"?
(The power supply is turned off and measured.)
*Is the sign wave of about 100mVp-p in the voltage had from each terminal?
[ CN201"9"(H1-),"10"(H1+),"11"(H2-),"12"(H2+),"13"(H3-),"14"(H3+) ]
2.Defective spindle motor driver (IC251)
*Has motor drive voltage of a sine wave or a rectangular wave gone out to each terminal(SM1~3)
of CN201"5,6,7" and IC251"2,4,7"?
*Is FG pulse output from the terminal of IC251"24"(FG) according to the rotation of the motor?
*Is it "L(about 0.9V)" while terminal of IC251"15"(VH) is rotating the motor?
3.Has the control signal come from servo IC or the microcomputer?
*Is it "L" while the terminal of IC251"18"(SBRK) is operating?
Is it "H" while the terminal of IC251"23"(/SPMUTE) is operating?
*Is the control signal input to the terminal of IC251"22"(EC)?
(changes from VHALF voltage while the motor is working.)
*Is the VHALF voltage input to the terminal of IC251"21"(ECR)?
4.Is the FG signal input to the servo IC?
*Is FG pulse input to the terminal of IC301"69"(FG) according to the rotation of the motor?
(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 "20" (ASOUT) and
IC101 "41"(RFENV) and IC101 "22" (FEOUT)?
1-20
(3) Traverse movement NG
1.Defective traverse driver
*Has the voltage come between terminal of CN101 "1" and "2" ?
2.Defective BTL driver (IC201)
*Has the motor drive voltage gone out to IC201"17" or "18"?
3.Has the control signal come from servo IC or the microcomputer?
*Is it "H" while the terminal of IC201"9"(STBY1) ?
*TRSDRV Is the signal input? (IC301 "67")
4.TRVSW is the signal input from microcomputer? (IC401 "46")
(4) Focus ON NG
* Is FE output ? --- Pattern, IC101
* Is FODRV signal sent ? (R209) --- Pattern, IC301 "115"
* Is driving voltage sent ?
IC201 "13", "14" --- If NG, pattern, driver, mechanical unit .
* Mechanical unit is defective.
(5) Tracking ON NG
XV-LTR1
* 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)
Constant or IC it self is defective.
* Servo IC (IC301)
When improperly adjusted due to defective IC.
(6) Spindle CLV NG
* IC101 -- "35"(RF OUT), "30"(ARF-), "31(ARF+).
* Does not the input or the output of driver's spindle signal do the grip?
* Has the tracking been turned on?
* Spindle motor and driver is defective.
* Additionally, "IC101 and IC301" and "Mechanism is defective(jitter)", etc. are thought.
(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, IC401.
The disc is dirty or the wound has adhered.
(8) Between layers jump NG (double-layer disc only)
Mechanism defective
Defect of driver's IC(IC201)
Defect of servo control IC(IC301)
1-21
XV-LTR1
(9) Neither picture nor sound is output
1.It is not possible to search
*Has the tracking been turned on?
*To
"(5) Tracking ON NG" in "Check points for each error"
*Is the feed operation normal?
To "(3) traverse movement NG" in "Check points for each error" when it is not normal.
Are not there caught of the feeding mechanism etc?
(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?
(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.
when the tracking is not normal.
There is a possibility with bad jitter
value for such a symptom.
(12) CD During normal playback operation
a) Is TOC reading normal?
Displays total time
for CD-DA.
Shifts to double-speed
mode for V-CD.
YES
NO
b)Playback possible?
*--:-- 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.
1-22
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