Jvc MXK 350 V Service Manual

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MX-K350V

JVB
SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MX-K350V

SP-MXK350V CA-MXK350V SP-MXK350V

[j] COMPACT CUM PACT

Has [tinge

VIDEOCD DIGITALAUDID

Area Suffix

US -- SINGAPORE

UX - -- SAUDI
Contents
Safety precautions - 1- 2 Flow of functional
Important for laser products - 1- 3 operation until TOC read - 1-20
Preventing static electricity - 1- 4 Maintenance of laser pickup - 1-21
Disassembly method - 1- 5 Replacement of laser pickup- 1-21
Adjustment method ........................... 1.1 8 Description of major le - 1-22

No.21166

COPYRIGHT ©2001 VICTOR COMPANY OF JAPAN, LTD.
Dec.2002

Page 2

- Safety Precautions

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 manufacturers warranty and
will funher 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
(A) 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, hightemperature 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 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, headphonejack, 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.

0 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.)

0 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 o. 10w resistor paralleled by a 0.15 M F GCamfifilgggm

AC-type capacitor between an exposed metal a ohms/soils,

part and a known good earth ground. Measure the o, more sensmvny)

AC voltage across the resistor with the AC

voltmeter. . _ 015/, F AC TYPE

Move the reSlstor connectlon to each exposed metal -I .

part, particularly any exposed metal part having a 3:9 "5

return path to the chassis, and meausre the AC A ngheeigosed

voltage across the resistor. Now, reverse the plug in 15000 10W mew part

the AC outlet and repeat each measurement. Voltage

measured Any must not exceed 0.75 V AC (r.m.s.). Good earth ground

This corresponds to 0.5 mA AC (r.m.s.).

Warning A CAUTION
1 . This equipment has been designed and manufactured to meet international safety standards. Burrs formed during molding may
2. It isthe legal responsibility ofthe repairerto ensure thatthese safetystandards are maintained. be left over on some parts of the
3. Repairs mustbe made in accordance with the relevant safety standards. chassis. Therefore. pay attention
4. It is essential that safety critical components are replaced by approved parts. t° such burrs_ "1 "1? case °f
. . . . preformlng repalr of thls system.

5. If malns voltage selector ls prov1ded, check settlng for local voltage.

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 (I), diode ( -l- ) and ICP ( I) or identified by the
A"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)

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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

I Top cover

I CD changer unit

I Front panel assembly
I Chassis unit

I CD changer unit
I Removing the main PCB
I Removing the CD changer mechanism assembly
I Removing the CD pickup
I Replacing the loading motor and belt of the CD changer tray
I Replacing the CD tray rotor belt of CD changer, and removing the motor

I Front panel assembly
I Removing the cassette deck mechanism
I Removing the earphone jack PCB
I Removing the control/FL PCB
I Removing the switch PCB and ACTIVE BASS EX. switch PCB
I Removing the cassette deck main motor, and replacing the main belts
I Removing the leaf switches of the cassette deck mechanism
I Removing the cassette deck heads

I Chassis unit
I Removing the 3-pin regulator
I Removing the power amp and supply PCB and the Power Trans PCB
I Removing the sub power PCB

1-5