JVC MX-KC4 Diagram
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MB36920056
MX-KC4
Area suffix
A ------------------------ Australia
UW ----------- Brazil,Mexico,Peru
UY ------------------------ Argentina
UJ ---------------------- U.S.Military
CA-MXKC4SP-MXKC4 SP-MXKC4
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
COPYRIGHT © 2005 Victor Company of Japan, Limited
No.MB369
2005/6
SPECIFICATION
Amplifier
Output Power 140 W per channel, min. RMS, driven into 6 Ω at 1kHz, with no
more than 10% total harmonic distortion (IEC 268-3)
Input Sensitivity/
Impedance (1 kHz)
Cassette Deck Section Frequency Response Type l (NORMAL) 63 Hz - 12 500 Hz
CD Player CD Capacity 3 CDs
Tuner FM Tuner 87.50 MHz - 108.00 MHz for A
Unit Dimensions 270 mm × 306 mm × 456 mm (W/H/D)
Speaker Specifications (each unit)
Type 3-way bass-reflex type
Speaker Unit Woofer 16 cm cone × 1
Power Handling Capacity 140 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)
Mass Approx. 3.9 kg
AUX IN 400 mV/50 kΩ
Speaker terminals 6 Ω - 16 Ω
Phones 32 Ω - 1 kΩ
15 mW/ch output into 32 Ω
Wow And Flutter 0.15% (WRMS)
Dynamic Range 85 dB
Signal-To-Noise Ratio 85 dB
Wow And Flutter Unmeasurable
AM Tuner 522 kHz - 1710 kHz for A
530 kHz - 1710 kHz (at AM10 kHz channel space) for UW, UJ, UY
531 kHz - 1710 kHz (at AM9 kHz channel space) for UW, UJ, UY
Mass Approx. 8.6 kg
Mid 5cm cone × 1
Tweeter 2cm dome × 1
Power Specifications
Power Requirements AC 240V 50Hz for A
AC 110 V/127 V/220 V/230 V-240 V , adjustable with voltage selector, 50 Hz/60 Hz for UW, UJ, UY
Power Consumption 140 W (power on mode)
22 W (in Standby mode)
Design and specifications are subject to change without notice.
1-2 (No.MB369)
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.MB369)1-3
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-4 (No.MB369)
SECTION 3
V
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.
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 A from the heat sink between the
power IC.
(2) Remove the solder fixing the power IC.
Fuse (F953)
T1.6AL 250V
Fig.1
W
Fuse (F951)
T3.15AL 250
Fuse (F952)
T1.6AL 250V
A
3.1.3 Replacing the heat sink cover
(See Fig.3)
(1) Remove four screws B from the rear panel.
(2) Pull the heat sink cover outward.
Fig.2
For CA-MXKC4 A
B
Fig.3
(No.MB369)1-5
3.1.4 Removing the top cover
(See Fig.4 to 7)
(1) Remove six screws C that retain the top cover from the
panel rear of the body.
(2) Remove six screws D that retain the top cover from the two
sides of the body.
(3) Remove the top cover from the body by lifting it toward the
rear.
For CA-MXKC4 UW
Top cover
C
For CA-MXKC4 A
Top cover
C
Fig.4
C
220V
110V
250V
127V
-240V
C
C
Fig.5
C
Top cover
C
220V
110V
250V
127V
-240V
C
C
Fig.6
Right Front panel assembly
D
D
Left Front panel assembly
D
D
Fig.7
1-6 (No.MB369)
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