JVC PCX-290 Service manual

CD PORTABLE COMPONENT SYSTEM

SERVICE MANUAL

PC-X290

PC-X290

HYPER-BASS

SOUND

J.................................................USA

C...........................................Canada

Contents

Page

HYPER-BASS

SOUND

Areas Suffix

Safety precautions............................................. 2 Exploded view................................................. .35

Block diagram ................................................... 3 Mechanical parts list.........................................37

Disassembly instructions................................... 4 Electrolytic parts list ......................................... 40

Troubleshooting ................................................ 5 IC lead identification

Main adjustment................................................ 7 and transistor pin out diagrams..............51

Wiring connections.......................................... 11 Voltage charts..................................................60

Printed circuit boards....................................... 12 Illustration of Packing and Parts List................62

Schematic diagrams........................................ 30

This service manual is made from 100% recycled paper.

COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.

No.
APR. 2004

PC-X290
30/MAR/200

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 warranty
and will further relieve the manufacture of responsibility for personal injury or property damage
resulting there from.

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, 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, tubing, 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 and 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 1,500Ω 10W resistor paralleled by a

0.15µF 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 eachexposed
metal part, particularly any exposed metal part
having a return path to the chassis, and
measure 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.).

Safety Precautions

0.15µF AC TYPE

1500Ω 10W

Good earth ground

AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity

Place this
probe on
each exposed
metal part.

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

pay attention to such burrs in the case of preforming repair of this system.

Warning

2

Burrs formed during molding may be left over on some parts of the chassis. Therefore,

PC-X290

30/MAR/2004

BLOCK DIAGRAM

TA2092

CD Servo

CD Pick

Up

CD RF AMP

TA2153FN

For Tape

For Tuner

Remote

Control

Remote

sensor

TC94A09

AUX IN

Key Board

MCU/CD

TA2149

Tuner

TC9257

PLL

Display

LCD

Back

Light

Regulator

For MCU/CD

Regulator

CD/MCU

Voltage

AC IN

Voltage

Rectifier

Supply

Main

Power AMP

TA8229PK

Power

Speaker

Phone

Selector

TC9422

Deck

Source

TA8189N

Section

Tape

TapeB

TapeA

Deck

3

PC-X290

30/MAR/2004

DISASSEMBLY INSTRUCTIONS

A

B

DD

L

R

ANT.

SCREW

D

OPEN

BEATCUT RESET

12

AUXIN

DO NOT USE THIS UNIT
IN DIRECT SUNLIGHT
OR LEAVE THE UNIT
IN CLOSED AUTOMOBILES
(OR YACHTS, ETC.)
WHERE IT WOULD BE EXPOSED
TO THE HIGH TEMPERATURE
(ABOVE 40 C (104 F)

OPEN

D

SPEAKERIMPEDANCEMIN 3.2

D

R

L

AC IN

D

D

C

ThisClass B digital apparatus
complieswith Canadian
ICES-003.

Cetappareil numerique de la
classeB est conforme ala
normeNMB-003 du Canada.

C

C

Removing Left and Right and Top side and back side

Remove all screws on left and right and back side

4