JVC MX-KC4 Service Manual
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MB35020054
MX-KC4
Area suffix
J ---------------------------- U.S.A.
C ------------------------- Canada
STANDBY/ON
SLEEP
AUX
FM /AM
FM MODE
CD
CD1CD2CD
3
PROGRAM/RANDOM
REPEAT
TAPE
TAPE
A
B
SOUND
VOLUME
MODE
FADE
MUTING
RHYTHM AX
REMOTE CONTROL
CA-MXKC4SP-MXKC4 SP-MXKC4
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
COPYRIGHT © 2005 Victor Company of Japan, Limited
No.MB350
2005/4
SPECIFICATION
Amplifier Output Power 180 W per channel, min. RMS, driven into 6 Ω at
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 85 dB
Signal-To-Noise Ratio 85 dB
Wow And Flutter Unmeasurable
Tuner FM Tuner 87.5 MHz - 108.0 MHz
AM Tuner 530 kHz - 1 710 kHz
Unit Dimensions 270 mm × 306 mm × 456 mm (W/H/D)
(10-11/16" × 12-1/16" × 18")
Mass Approx. 8.6 kg (19.0 lbs)
Speaker Specifications (each unit)
SP-MXKC4
Power Specifications Power Requirements AC 120 V , 60 Hz
Type 3-way bass-reflex type
Speaker Unit Woofer: 16 cm (6-5/16") cone × 1
Mid: 5cm (2") cone × 1
Tweeter: 2 cm (13/16") dome × 1
Power Handling Capacity 180 W
Impedance 6 Ω
Frequency Range 45 Hz - 22 000 Hz
Sound pressure level 87 dB/W·m
Dimensions 266 mm × 333 mm × 241 mm (W/H/D)
(10-1/2" × 13-1/8" × 9-1/2")
Mass Approx. 3.9 kg (8.6 lbs)
Power Consumption 150 W (power on mode)
22 W (in Standby mode)
Design and specifications are subject to change without notice.
1-2 (No.MB350)
SECTION 1
PRECAUTION
1.1 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. 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 reassembling.
(5) Leakage shock hazard testing
After reassembling 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 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.).
• Alternate check method
Plug the AC line cord directly into the AC outlet. Use an
AC voltmeter having, 1,000Ω 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 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.).
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
0.15 F AC TYPE
Place this
probe on
1500 10W
Good earth ground
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 preforming 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)
each exposed
metal part.
(No.MB350)1-3
1.5 Preventing 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.
1.5.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products.
Be careful to use proper grounding in the area where repairs are being performed.
(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) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(caption)
Anti-static wrist strap
1M
Conductive material
(conductive sheet) or iron palate
(3) Handling the optical pickup
• 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.)
• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.
1.6 Handling the traverse unit (optical pickup)
(1) Do not subject the traverse 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 traverse 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) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.7 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the pickup unit.
• Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexible
wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire.
CD changer
unit
1-4 (No.MB350)
Flexible cable
Soldering
1.8 Importance administering point on the safety
Caution: For continued protection against risk of
fire, replace only with same type 3.5A/125V for
F901 and 1.6A/250V for F902. This symbol
specifies type of fast operating fuse.
Precaution: Pour eviter risques de feux, remplacez
le fusible de surete de F901 comme le meme type
que 3.5A/125V et F902 que 1.6A/250V .
Ce sont des fusibles suretes qui functionnes rapide.
^
(No.MB350)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe PRECAUTION.
1-6 (No.MB350)
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the metal cover/ rear cover
(See Fig.1 to 5)
(1) Remove the four screws A on the back of the body.
(2) Remove the six screws B on the back of the body.
(3) Remove the four screws C and the two screws D on both
sides of the body.
(4) Move the metal covers in the direction of the arrow with
pulling them sideways, and release two joints a and six
joints b.
A
Rear cover
A
Fig.1
Metal cover
B
BB
Fig.2
(No.MB350)1-7
Front panel assembly
D
C
Metal cover
Metal cover
Fig.3
Front panel assembly
D
C
b
Metal cover
1-8 (No.MB350)
Fig.4
a
b
Fig.5
3.1.2 Removing the CD fitting
(See Fig.6 to 8)
• Prior to performing the following procedure, remove the metal
cover/ rear cover.
Caution:
For protecting the CD fitting from damage, remove it before detaching the CD changer mechanism unit.
(1) Push STANDBY/ON key to turn on the power.
(2) Push CD tray eject key.
(3) Move the CD fitting in the direction of the arrow to release
two joints d of the CD tray.
(4) Push STANDBY/ON key to close the tray.
3.1.3 Removing the CD fitting
(See Fig.7 to 9)
[How to eject the CD tray without turning on the power]
• Prior to performing the following procedure, remove the metal
cover/ rear cover.
(1) Turn the loading pulley gear on the bottom of the CD
changer mechanism unit (part e) as shown in the figure to
move the CD tray frontward.
(2) Move the CD fitting in the direction of the arrow to release
two joints d.
(3) Push and close the CD tray.
CD changer mechanism unit
CD fitting
STANDBY / ON key
Fig.6
d
CD tray
CD tray eject key
Front panel assembly
CD fitting
d
Fig.7
(No.MB350)1-9
Loading...