MX-K350V
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MX-K350V
Area Suffix
US .................. SINGAPORE
UX .................. SAUDI
Contents
Safety precautions ----------------------------- 1- 2
Important for laser products ------------------ 1- 3
Preventing static electricity ------------------- 1- 4
Disassembly method -------------------------- 1- 5
Adjustment method --------------------------- 1-18
Flow of functional
operation until TOC read --------------- 1-20
Maintenance of laser pickup ---------------- 1-21
Replacement of laser pickup ---------------- 1-21
Description of major ICs --------------------- 1-22
COPYRIGHT
© 2001VICTOR COMPANY OF JAPAN, LTD.
No.21166
Dec.2002
1-2
1. This design of this product contains special hardware and many circuits and components specially or
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.
l
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.)
l
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 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.).
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)
Safety Precautions
!
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.
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
Important for laser products
1. CLASS 1 LASER PRODUCT
2. DANGER : Invisible laser radiation when open and inter
lock failed or defeated. Avoid direct exposure to beam.
3. CAUTION : There are no serviceable parts inside the Laser
Unit. Do not disassemble the Laser Unit. Replace the
complete Laser Unit if it malfunctions.
4. CAUTION : The compact disc player uses invisible laser
radiation and is equipped with safety switches which
prevent emission of radiation when the drawer is open
and the safety interlocks have failed or are defeated. It is
dangerous to defeat the safety switches.
5. CAUTION : If safety switches malfunction, the laser is able
to function.
6. CAUTION : Use of controls, adjustments or performance of
procedures other than those specified herein may result
in hazardous radiation exposure.
!
CAUTION
Please use enough caution not to
see the beam directly or touch it in
case of an adjustment or operation
check.
VARNING :
Osynlig laserstrålning är denna del är
öppnad och spårren är urkopplad. Betrakta
ej strålen.
VARO
:
Avattaessa ja suojalukitus ohitettaessa olet
alttiina näkymättömälle lasersäteilylle. Älä
katso säteeseen.
ADVARSEL :
Usynlig laserstråling ved åbning, når
sikkerhedsafbrydere er ude af funktion.
Undgå udsættelse for stråling.
ADVARSEL :
Usynlig laserstråling ved åpning, når
sikkerhetsbryteren er avslott. Unngå
utsettelse for stråling.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
1-4
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.
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 testers internal power
source can easily destroy the laser diode.
4. Handling the CD changer unit (optical pickup)
1. Do not subject the CD changer 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 CD changer
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 ad-
justs the laser power. Do not turn it.
Attention when traverse unit is decomposed
* Please refer to
"Disassembly method " in the text for pick
up and how to detach the CD changer mechanism.
1. Remove the CD changer unit.
2. Disconnect the harness from connector on the CD motor board.
3. Solder is put up before the card wire is removed from connector
Cn601on the main board as shown in Fig.1 and Fig. 2.
(When the wire is removed without putting up solder, the CD
pick-up assembly might destroy.)
4. Please remove solder after connecting the card wire with CN601
when you install picking up in the substrate.
1-5
Disassembly method
Commence disassembly of this set by removing the main units and then proceed to the components and assemblies
inside the units.
Replacement of the fuses and the power IC
n Top cover
n CD changer unit
n Front panel assembly
n Chassis unit
n CD changer unit
n Removing the main PCB
n Removing the CD changer mechanism assembly
n Removing the CD pickup
n Replacing the loading motor and belt of the CD changer tray
n Replacing the CD tray rotor belt of CD changer, and removing the motor
n Front panel assembly
n Removing the cassette deck mechanism
n Removing the earphone jack PCB
n Removing the control/FL PCB
n Removing the switch PCB and ACTIVE BASS EX. switch PCB
n Removing the cassette deck main motor, and replacing the main belts
n Removing the leaf switches of the cassette deck mechanism
n Removing the cassette deck heads
n Chassis unit
n Removing the 3-pin regulator
n Removing the power amp and supply PCB and the Power Trans PCB
n Removing the sub power PCB