JVC MX-KC2 Manuale utente

SERVICE MANUAL

2005/7

COMPACT COMPONENT SYSTEM

MB39420057

MX-KC2

Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

CA-MXKC2 SP-MXKC2SP-MXKC2

Area suffix

C ------------------------- Canada

1-2 (No.MB394)

SPECIFICATION

Design and specifications are subject to change without notice.

Amplifier Output Power 60 W per channel, min. RMS, driven into 6 Ωat 1kHz, with

no more than 10% total harmonic distortion

Input Sensitivity/Impedance

(1 kHz)

AUX IN 400 mV/50 kΩ

Speaker terminals 6 - 16 Ω

Phones 32 Ω- 1 kΩ

15 mW/ch output into 32 Ω

Cassette Deck Section Frequency Response Type l (NORMAL) 63 Hz - 12 500 Hz

Wow And Flutter 0.15% (WRMS)

CD Player CD Capacity 3 CDs

Dynamic Range 83 dB

Signal-To-Noise Ratio 85 dB

Wow And Flutter Unmeasurable

Tuner Tuning Range FM Tuner 87.5 MHz - 108.0 MHz

AM Tuner 530 kHz - 1 710 kHz

Unit Dimensions 270 mm ×308 mm ×410mm (W/H/D)

(10-11/16" ×12-3/16" ×16-3/16")

Mass Approx. 6.5 kg (14.4 lbs)

Speaker Specifications

(each unit)

Type 2-way bass-reflex type

Speaker Unit Woofer 13 cm (5-1/8") cone ×1

Tweeter 5cm (2") cone ×1

Power Handling Capacity 60 W

Impedance 6 Ω

Frequency Range 45 Hz - 22 000 Hz

Sound pressure level 87 dB/W·m

Dimensions 205 mm ×308 mm ×209 mm (W/H/D)

(8-1/8" ×12-3/16" ×8-1/4")

Mass Approx. 2.9 kg (6.4 lbs)

Power Specifications Power Requirements AC 120 V , 60 Hz

Power Consumption 95 W (power on mode)

13 W (in Standby mode)

1.2 W (in ECO mode)

(No.MB394)1-3

SECTION 1

PRECAUTION

1.1 Safety Precautions

(1) This design of this product contains special hardware and

many circuits and components specially for safety purpos-

es. 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 per-

formed 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 characteris-

tics are often not evident from visual inspection nor can the

protection afforded by them necessarily be obtained by us-

ing replacement components rated for higher voltage, watt-

age, etc. Replacement parts which have these special

safety characteristics are identified in the Parts List of Ser-

vice 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 charac-

teristics 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 reassem-

bling.

(5) Leakage shock hazard testing

After reassembling the product, always perform an isola-

tion check on the exposed metal parts of the product (an-

tenna 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, particular-

ly any exposed metal part having a return path to the

chassis, to a known good earth ground. Any leakage cur-

rent 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, 1,000Ωper volt or more sensitivity

in the following manner. Connect a 1,500Ω10W resistor

paralleled by a 0.15µF AC-type capacitor between an ex-

posed 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 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.).

1.2 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 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 pre-

forming repair of this system.

1.4 Critical parts for safety

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.

(This regulation dose not Except the J and C version)

Good earth ground

Place this

probe on

each exposed

metal part.

AC VOLTMETER

(Having 1000

ohms/volts,

or more sensitivity)

1500 10W

0.15 F AC TYPE

1-4 (No.MB394)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB394)1-5

SECTION 3

DISASSEMBLY

3.1 Disassembly of the main blocks of the set

Replacement of the fuses and the power IC.

3.1.1 Replacing the fuses

(See Fig.1)

• Prior to performing the following procedure, remove the left

side board.

(1) Replace the fuses inside.

Caution:

Be sure to use fuses with the specified ratings.

Fig.1

3.1.2 Replacing the power IC

(See Fig.2)

• Prior to performing the following procedure, remove the top

cover.

(1) Remove the two screws Afrom the heat sink between the

power IC.

(2) Remove the solder fixing the power IC.

Fig.2

3.1.3 Replacing the heat sink cover

(See Fig.3)

(1) Remove four screws Bfrom the rear panel.

(2) Pull the heat sink cover outward.

Fig.3

Fuse (F901)

1.6AL 250V

1-6 (No.MB394)

3.1.4 Removing the top cover right cabinet and left cabinet

(See Fig.4 and 5)

(1) Remove three screws Cthat retain the top cover from the

panel rear of the body.

(2) Remove six screws Dthat retain the left can/net from the

body.

(3) Remove six screws cthat retain the right can/net from the

body.

Fig.4

Fig.5

top cover

right cabinet

left cabinet

Right Front panel assembly

Left Front panel assembly

(No.MB394)1-7

3.1.5 Removing the CD changer unit

(See Fig.6 to 8)

• Prior to performing the following procedures, remove the top

cover.

Caution:

Although the CD mechanism unit can be removed without re-

moving the CD tray panel, it is still recommended to remove it

in order to prevent damage.

• From the front panel side of this set, push in the sections

marked with arrows and pull out the CD tray toward the front.

• Remove the CD tray panel by pushing both of its extremities

upward in the direction of the arrows.

• Push the CD tray deep into the set.

(1) Disconnect the cord wires from the CD board CN703 and

CN203.

(2) From the rear of the set, remove two screws E, and four

screws Gon the front panel left and right side.

(3) Handle the CD changer unit rear, take out the unit.

Fig.6

Fig.7

Fig.8

CD tray panel

1-8 (No.MB394)

3.1.6 Removing the front panel assembly

(See Fig.9 to 10)

• Prior to performing the following procedures, remove the top

cover.

Also remove the CD changer unit.

(1) Disconnect the parallel wire and the cord wire from the con-

nectors CN701, CN101 on the power amp. board.

(2) Remove one screws Hretaining the front panel assembly

onto the bottom of the body.

(3) Remove two screws Ion the front cabinet and bottom cab-

inet and then remove then GND lug bthat comes from the

power amp and supply board.

(4) Disengage the claws con both sides of the front panel as-

sembly and then remove the assembly.

Fig.9

Fig.10

Claw

GND lug

(No.MB394)1-9

3.2 Disassembly of units and assembly inside this set

3.2.1 Removing the MAIN board

(See Fig.11 to 12)

• Prior to performing the following procedures, remove the top

cover.

Also remove the CD changer unit.

(1) Disconnect the wires from CN603A, CN603B and CN604

on the MAIN board, which is located on the back side of the

CD changer unit.

(2) The four screws Jthat retain the CD board should be re-

moved.

(3) Remove the CD board by pulling it toward the side where

the CN601 is located.

(4) Using solder, short the CD pickup to connect to short

round.

Caution:

After re-connecting the wires, be sure to remove the

shorting solder from the GND connection.

(5) Disconnect the card wire from the connector CN601 on the

main board and then remove the main board.

Fig.11

Fig.12

P AIN PCB

CD PCB

Short round

CN601

1-10 (No.MB394)

3.2.2 Removing the CD changer mechanism assembly

(See Fig.13 to 14)

• Prior to performing the following procedures, remove the top

cover.

Also remove the CD changer unit.

(1) Turn the CD changer mechanism cover base and remove

the screws dconnecting the unit to the CD changer mech-

anism assembly.

(2) Removing four screws eretaining the CD mechanism hold-

er assembly.

Caution:

When replacing the CD changer mechanism assembly, be

sure not to mistake the positions of the silver color and copper

color spring.

Fig.13

Fig.14

CD changer unit

assembly

( Green color )

( Red color )

( Green color )

( Red color )

CD changer mechanism

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