Jvc-XV-523-GD-Service-Manual.pdf

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Important Information
1. Main adjustment
2. Check point for each error
3. IC701 (M101C12GHA)
For the above 3 items, a supplementary edition
will be issued in early July.
XV-521BK/523GD
XV-525BK/421BK
SERVICE MANUAL
DVD PLAYER
XV-521BK/523GD
XV-525BK/421BK
J
Area Suffix
XV-421BK
U.S.A
Area Suffix
XV-525BK/523GD
J
U.S.A
Area Suffix
XV-521BK
C
Canada
Contents
Safety precautions
Importance administering
point on the safety
Dismantling and assembling
the traverse unit
1-2
1-3
1-4
Disassembly method
Precautions for service
Description of major ICs
1-5
1-15
1-16
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
AC VOLTMETER
metal part and a known good earth ground.
(Having 1000
Measure the AC voltage across the resistor with the
ohms/volts,
or more sensitivity)
AC voltmeter.
Move the resistor connection to eachexposed metal
part, particularly any exposed metal part having a
0.15 F AC TYPE
return path to the chassis, and meausre the AC
Place this
voltage across the resistor. Now, reverse the plug in
probe on
the AC outlet and repeat each measurement. voltage
each exposed
1500 10W
metal part.
measured Any must not exceed 0.75 V AC (r.m.s.).
This corresponds to 0.5 mA AC (r.m.s.).
Good earth ground
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.
!
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.
1-2
XV-521BK/523GD/525BK/421BK
Importance administering point on the safety
F901
For USA and Canada / pour Etats - Unis d' Amerique et Canada
Caution: For continued protection against risk of
fire, replace only with same type 1.6A/250V for F901.
This symbol specifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de comme le meme type que
1.6A/250V pour F901.
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.
Shorting
Shot with the clip
1-4

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