Jvc MXJ 330 Service Manual

Page 1

MX-J30
MX-JSSO
MX-J35R

SERVICE MANUAL

Area Suffix (W430)
J .................. U.S.A.

MX-J30
MX-J330

US ------------ Singapore

UX Saudi Arabia

x R UT ------ Taiwan

- UP ._.. ----- Korea

UY ------------- Argentina

A --------------- Australia

B ------------------- U.K.

E Continental Europe

EN Northern Europe

5; EE --------------- Russia

:= EV ------ Eastern Europe
Am Suffix (MX-Ja30)

E Continental Europe
EN Northern Europe
B -------------------- U.K.

Area Suffix (MX-J35R)
E Continental Europe
EN ----- Northern Europe

This Illustration is MX-J30

EV ------ Eastern Europe
COMPACT
@R-D-s EON [filflgg
Only MX-J35R DIGITAL AUDIO
Contents
Safety precautions ----------------------- 1-2 Maintenance of laser pickup ---------- 2-27
Importance admistering point --------- 1-3 Replacement of laser pickup -- -- 2-27
Important for laser products ----------- 1-4 Adjustment method ---------------------- 2-28
Each defference point ------------------- 1-5 Diagnosis which uses extension
Instructions ---------------------------------- 1-6 wire method 2-32
Description of major ICs ---------------- 2-1 Block diagram --------------------------- 2-33
Internal connection of FL display tube 2-7 Standard schematic diagrams --------- 2-35
Disassembly method -------------------- 2-8 Printed circuit boards - 2-46
Flow 01 functional operation Parts list ------------------------------------ 3-1 ~29

until TOC read --------- 2-26

This service manual is made from 100% recycled paper.

COPYRIGHT © 1999 VICTOR COMPANY OF JAPAN, LTDt - 7,

No.20743
Apr. 1 999

Page 2

MX-J30/MX-J330/MX-35R
-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 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. Electricai 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, 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 tenninals, 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.

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 areturn 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 1,500910W resistor paralleled by
a 0.1511 F AC-type capacitor between an exposed

metal part and a known good earth ground. fimgéwggm
Measure the AC voltage across the resistor with the 7 ohms/volts,
AC voltmeter. or more sensitivity)
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a 015;: ACTYPE
return path to the chassis, and measure the AC "WH" Piace this

voltage across the resistor. Now reverse the plug in probe on
the AC outlet and repeat each measurement voltage WV " > each exposed
measured any must not exceed 0.75 V AC (r.m.s.). 15009 10W metal part.

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

-Warnmg
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.

A CAU110N 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

Page 30

MX-J30/MX-J330/MX-J35R

< Front Assembly > Main board Front panel
CN416 CN402 CN403 assembly

I Remowng the From Panel Assembly
(See Fig.7 to 9)

~ Prior to performing the following procedure, remove the
metal cover and CD changer mechanism assembly.

1. Disconnect the card wires from connector CN402, CN403
and CN416 on the main board.

2. Disconnect the flat wire from connector CN212 on the
amplifier board.

3. Disconnect the flat wire from connector CN410 on the
main board. (only Ver,U type)

4. Flemove the four E screws attaching the front panel
assembly on the bottom of the body.

5. Release the two joints(a) and (b) on the lowerlefl and
right sides of the body using a screwdriver, and remove Ampufief board CN212
the front panel assembly toward the front. Fig.7

Fig.8

Joint(b)

Joint(a)
Fig.9a Fig.9b

2-10

Page 45

MX-J30/MX-J330/MX-J35R

[Removing the Capstan Motor (See Fig 8)

Capstan motor
From the joint bracket, remove the two screws "C" .
retaining the capstan motor.

lRemoving the Flywheel (See Fig 9.10)

1.Remove the head amp. and mechanism control C
P.C.Board.
2.Fiemove the capstan motor assembly.
3.After turning over the cassette mechanism, remove
the slit washers "a" and "b" fixing the capstan shafts
R and L, and pull out the flywheels R and L respectively
from behind the cassette mechanism.

Flywheel Fl Flywheel L

Flywheel Fl FIyMteel L

IRemoving the Reel Pulse P.C.Board and Solenoid
(See Fig 11)

1.Remove the five pawls (c,d,e,f,g) retaining
the reel pulse P.C.Board.

2.From the surface of the reel pulse P.C.Board parts,
remove the two pawls "h" and i" retaining the solenoid.

C d e f 9 Reel pulse board

Solenoid

Solenoid

2-25