Service Manuals, User Guides, Schematic Diagrams or docs for : JVC Monitor JVC_MX-DVB10_[SM]
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MX-DVB10
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MX-DVB10 Area suffix
US ------------- Singapore
UX ---------- Saudi Arabia
UN -------------------Asean
(SP-XSDVB10) (SP-XCDVB10) (SP-XSDVB10)
REAR CENTER REAR
(SP-XDVB10) (SP-WDVB10) (CA-MXDVB10) (SP-WDVB10) (SP-XDVB10)
MAIN SUBWOOFER SUBWOOFER MAIN
Contents
Safety precautions 1-2 Maintenance of laser pickup 1-34
Preventing static electricity 1-3 Replacement of laser pickup 1-34
Precautions for service 1-4 Flow of functional operation
Important for laser products 1-5 until TOC read 1-35
Disassembly method 1-6 Description of major ICs 1-36~70
Adjustment method 1-26
No.21120
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. Sep. 2002
MX-DVB10
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 re-assembling.
5. Leakage current 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. AC VOLTMETER
Measure the AC voltage across the resistor with the AC (Having 1000
voltmeter. ohms/volts,
or more sensitivity)
Move the resistor connection to each exposed metal part,
particularly any exposed metal part having a return path to
0.15 F AC TYPE
the chassis, and measure the AC voltage across the resistor.
Now, reverse plug in the AC outlet and repeat each Place this
probe on
measurement. Voltage measured any must not exceed 0.75 V each exposed
AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 1500 10W metal part.
Good earth ground
!
1. This equipment has been designed and manufactured to meet international safety standards. Burrs formed during molding may
2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained. be left over on some parts of the
3. Repairs must be made in accordance with the relevant safety standards. chassis. Therefore, pay attention to
4. It is essential that safety critical components are replaced by approved parts. such burrs in the case of
5. If mains voltage selector is provided, check setting for local voltage. 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.
(This regulation does not correspond to J and C version.)
1-2
MX-DVB10
Preventing static electricity
1. Grounding to prevent damage by 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.
2. About the earth processing for the destruction prevention by static electricity
In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of
the work environment.
Be careful to use proper grounding in the area where repairs are being performed.
2-1 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.
2-2 Ground yourself
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
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.
4. 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
MX-DVB10
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. 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.
5. 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:
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.
When you remove the traverse mechanism from the servo control substrate
The laser diode of pick-up might be destroyed by static electricity and set switch (S11) on the pick-up board
on "SHORT" side, please before removing the card wire from connector (CN10).
Moreover, please set switch (S11) on "OPEN" side after assembling and inserting the card wire in
connector (CN10) without fail at times.
CN10 SWITCH S11
Traverse CN12 SHORT
mechanism
OPEN
When you remove the pick-up from the traverse mechanism
The laser diode of the pick-up might be destroyed by static electricity. Before extracting
the flexible wire from connector (CN12), please solder point A as shown below.
Moreover, please remove solder in point A after inserting a flexible wire in connector (CN12).
Pick-up
Traverse
mechanism
Soldering points A
1-4
MX-DVB10
Important for laser products
1. CLASS 1 LASER PRODUCT 5.CAUTION : If safety switches malfunction, the laser is able
2. DANGER : Invisible laser radiation when open and inter to function.
lock failed or defeated. Avoid direct exposure to beam. 6.CAUTION : Use of controls, adjustments or performance of
3. CAUTION : There are no serviceable parts inside the procedures other than those specified herein may result in
Laser Unit. Do not disassemble the Laser Unit. Replace hazardous radiation exposure.
the complete Laser Unit if it malfunctions.
4.CAUTION : The compact disc player uses invisible laser
radiation and is equipped with safety switches which ! CAUTION Please use enough caution not to
see the beam directly or touch it
prevent emission of radiation when the drawer is open
in case of an adjustment or operation
and the safety interlocks have failed or are defeated. It is check.
dangerous to defeat the safety switches.
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