JVC XV-521BK, XV523GD, XV-525BK, XV421BK Service Manual
SERVICE MANUAL
DVD PLAYER
XV-521BK/523GD
XV-525BK/421BK
J
C
XV-521BK/523GD
XV-525BK/421BK
Area Suffix
XV-421BK
U.S.A
Canada
Contents
Safety precautions
Importance administering
point on the safety
Dismantling and assembling
the traverse unit
Instructions
Disassembly method
Main adjustment
1-2
1-3
1-4
1-5
1-15
Check points for each error
Precautions for service
Description of major ICs
Block diagram
Standard schematic diagrams
Printed circuit boards
Parts list
XV-525BK/523GD
J U.S.A
C Canada
Area Suffix
Area Suffix
XV-521BK
1-18
1-23
1-24
2-1
2-5
2-12
3-1~
COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.
No.20836
Jun. 2000
XV-521BK/523GD/525BK/421BK
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 manufacturer`s
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 re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling 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 eachexposed metal
part, particularly any exposed metal part having a
return path to the chassis, and meausre 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.
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.
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.
1-2
CAUTION
!
XV-521BK/523GD/525BK/421BK
Importance administering point on the safety
For USA and Canada / pour Etats - Unis d' Amerique et Canada
Caution: For continued protection against risk of
fire, replace only with same type 2A/250V for
F8901, 1.6A/250V for F8911 and F8921. This symbol
specifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de F8901 comme le meme type
que 2A/250V, et 1.6A/250V pour F8911 et F8921.
Ce sont des fusibles suretes qui functionnes rapide.
^
1-3
XV-521BK/523GD/525BK/421BK
Dismantling and assembling the traverse unit
1. Notice regarding replacement of optical pickup
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 to the optical pickup or connected devices.
(Refer to the section regarding anti-static measures.)
1. Do not touch the area around the laser diode and actuator.
2. Do not check the laser diode using a tester, as the diode may easily be destroyed.
3. It is recommended that you use a grounded soldering iron when shorting or removing the laser diode.
Recommended soldering iron: HAKKO ESD-compatible product
4. Solder the land on the optical pickup's flexible cable.
Note : Short the land after shorting the terminal on the flexible cable using a clip, etc., when using an
ungrounded soldering iron.
Note : After shorting the laser diode according to the procedure above, remove the solder according
to the text explanation.
Short circuit land
Laser pick-up unit
Flexible cable
Shorting
Shot with the rclip
1-4
Disassembly method
XV-521BK/523GD/525BK/421BK
< Main body>
Removing the top cover (See Fig.1)
1.
Remove the four screws A on both side of the body.
2.
Remove the two screws B on the back of the body.
3.
Lift up the rear part of the top cover while pulling the
lower part of the sides, then detach upward.
Removing the rear panel (See Fig.2)
Prior to performing the following procedure, remove
the top cover.
1.
Remove the seven screws C on the back of the
body.
A
2
Rear panel
C
A
2
C
Top cover
B
Fig.1
C
C
Fig.2
1-5
XV-521BK/523GD/525BK/421BK
Removing the fitting (See Fig.3 to 6)
Prior to performing the following procedure, remove
the top cover.
ATTENTION:
by hand
1.
Turn over the body. Insert a screwdriver into the hole
of the bottom chassis and turnit. The loading tray will
be ejected out of the front panel assembly.
2.
Pull the loading tray toward the front.
3.
Remove the fitting upward from the loading tray at
the joints b.
4.
Push and return the loading tray.
To remove the front panel assembly
and the DVD mechanism assembly,
remove the fitting in advance.
Front panel
Front panel assembly
TRAY OPEN
(Bottom)
Fig.3
Hole
Bottom chassis
Loading tray
Front panel assembly
Fitting
Joint b
Joint b
Front panel assembly
Fig.4
Loading tray
Fig.5
DVD mechanism assembly
1-6
Loading tray
Fig.6
Removing the front panel assembly
(See Fig.7 to 10)
Prior to performing the following procedure, remove
the top cover and the fitting.
1.
Disconnect the card wire from connector CN703 on
the main board.
2.
Turn over the body and remove the screw D
attaching the front panel assembly.
3.
Release the five joints c on both sides and bottom of
the body and remove the front panel assembly
toward the front.
ATTENTION:
The connector CN832 on the front
panel assembly and CN971 on the AC
jack board will be disconnected at the
same time.
AC jack board
CN971
XV-521BK/523GD/525BK/421BK
DC mechanism assembly
Main board
Front panel assembly
Fig.7
Joint c Joint c
D
CN703
Front panel assembly
Fig.8
Fig.9
Front panel assembly
Joint c
Joint c
Fig.10
1-7
XV-521BK/523GD/525BK/421BK
Removing the DVD mechanism assembly
(See Fig.11 to 14)
Prior to performing the following procedure, remove
the top cover and the front panel assembly.
1.
Disconnect the card wire from connector CN101 on
the DVD Servo.
2.
Disconnect the harness from connector CN031 on
the DVD mechanism assembly.
3.
Remove the screw E on the rear left part of the
loading tray.
3.
From the front side of the DVD mechanism
assembly, move the lever d in the direction of the
arrow and pull out the loading tray.
4.
Remove the two screws F on the upper side of the
DVD mechanism assembly. Then release the two
joints e and detach the clamper base back-upward.
5.
Remove the three screws G attaching the DVD
mechanism assembly.
E
Loading tray
Fig.11
Loading tray
CN101
DVD Servo
DVD mechanism assembly
P031
Lever d
P031
F
DVD mechanism assembly
Fig.12
DVD mechanism assembly
CN101
F
Joint e Joint eClamper base
Fig.13
G
CN101
1-8
G
G
DVD mechanism assembly
Fig.14
Removing the AC jack board
(See Fig.15 and 16)
Prior to performing the following procedure, remove
the top cover and the front panel assembly.
1.
Remove the two screws H attaching the AC jack
board.
2.
Remove the two screws C on the rear panel.
3.
Disconnect connector CN951 and CN961 on the AC
jack board from CN704 and CN705 on the main
board respectively.
H
XV-521BK/523GD/525BK/421BK
CN951 / CN705
H
CN961 / CN704
Fig.15
Main boardAC jack board
Removing the DVD Servo
(See Fig.17 and 18)
Prior to performing the following procedure, remove
the top cover.
1.
Remove the screw I attaching the DVD Servo.
2.
Pull out the DVD Servo from the fix f while pinching
the fix f.
3.
Disconnect connector CN501, CN502 and CN503 on
the DVD Servo from CN601, CN701 and CN706 on
the main board respectively.
Rear panel
Fix f
C
Fig.16
CN501 / CN706
I
CN101
DVD Servo
CN503 / CN701CN502 / CN701
Fig.17
Fix f
Main board
Fig.18
DVD Servo
1-9
XV-521BK/523GD/525BK/421BK
Removing the main board
(See Fig.19 and 20)
Prior to performing the following procedure, remove
the top cover, the front panel assembly, the DVD
mechanism assembly, the AC jack board and the
DVD Servo
1.
Remove the three screws J attaching the main
board.
2.
Remove the two screws C on the rear panel.
.
<Front panel assembly>
Main board
J
J
J
Fig.19
Prior to performing the following procedure, remove
the top cover and the front panel assembly.
Removing the power switch board
(See Fig.21)
1.
Unsolder connector FW841 on the power switch
board on the back of the front panel assembly.
2.
Remove the two screws K attaching the power
switch board.
3.
Push the two tabs g in the direction of the arrow and
remove the power switch board.
Removing the LCD board (See Fig.22)
1.
Unsolder connector FW802 and soldering h on the
LCD board.
2.
Remove the four screws L attaching the LCD board.
Removing the search switch board
(See Fig.20)
C
Fig.20
Front panel assembly
Fig.21
Rear panel
Power switch board
K
Tabs g
K
FW841
1.
Unsolder soldering i on the search switch board.
2.
Remove the three screws M.
3.
Release the four tabs j in the direction of the arrow
and remove the search switch board.
1-10
M
Tabs j 4
M
L
hi
Fig.22
Front panel assemblySearch switch board
LCD board
FW802
LLL
XV-521BK/523GD/525BK/421BK
Disassembly method
<DVD mechanism>
Removing the traverse mechanism unit
(See Fig.1 and 2)
1.
Remove the screw A and the spring on the upper
side of the loading base assembly.
2.
Move the rear part of the traverse mechanism unit
upward and pull backward to release the two joints a
with the base chassis.
ATTENTION:
When reattaching, engage the two
joints a and make sure the front
springs and the four insulators of the
traverse mechanism unit are correctly
attached.
Spring and Insulator
Traverse mechanism unit
A
Joints a
Fig.1
A
Spring
Spring
Joints a
Spring and Insulator
Removing the loading motor / loading
motor board (See Fig.3 and 4)
1.
Move the cam plate on the upper side of the loading
base assembly in the direction of the arrow.
2.
Remove the belt from the motor pulley.
3.
Remove the two screws B attaching the loading
motor.
4.
Turn over the loading base assembly and release the
loading motor board from the three tabs b while
spreading them outward. The loading motor board
will be detached with the loading motor.
Insulator
Fig.2
Belt
B
B
Cam plate
Fig.3
Loading motor
5.
Unsolder soldering c on the loading motor board and
remove the loading motor.
Ref.:
To remove the loading motor board only,
unsolder soldering c on the loading motor and
release the three tabs b.
Tab b
Tab b
Tab b
c
Loading motor board
Fig.4
1-11
XV-521BK/523GD/525BK/421BK
Removing the pickup (See Fig.5 to 9)
It is not necessary to remove the traverse
mechanism unit.
1.
Solder soldering d on the flexible board next to the
pickup unit.
2.
From the bottom of the traverse mechanism unit,
disconnect the flexible wire from CN10 on the pickup
board.
ATTENTION:
3.
Remove the screw C attaching the shaft stopper (R)
on the upper side of the traverse mechanism unit.
Pull the side of the shaft stopper (R) outward to
release the joint e and remove it upward. Remove
the skew spring at the same time.
4.
Move the shaft in the direction of the arrow to release
it from the part f.
Disconnecting the flexible wire without
soldering may cause damage to the
pickup.
Pickup unit
Flexible board
d
Fig.5
Pickup board
CN10
Flexible wire
5.
Release the joint g with the shaft and remove the
pickup with the shaft.
6.
Pull out the shaft.
7.
Remove the screw D attaching the switch actuator.
Shaft
Pickup
D
Pickup unit
Shaft
Joint g
Shaft stopper (R)
Fig.6
Shaft stopper (R)
Fig.7
C
C
Shaft
Part f
Shaft stopper (R)
Joint e
1-12
Switch actuator
Skew spring
Shaft
Fig.8Fig.9
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