JVC MX-KC68J, MX-KC68C, MX-KC68B, MX-KC68E, MX-KC68EN Service Manual
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SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MB664<Rev.002>20088SERVICE MANUAL
MX-KC68J, MX-KC68C, MX-KC68B, MX-KC68E,
MX-KC68EN, MX-KC68EV, MX-KC68A,
MX-KC68UJ, MX-KC68UW, MX-KC38J, MX-KC38C
SP-MXKC68W
SP-MXKC68F
SP-MXKC38
SP-MXKC68F
SP-MXKC38
CA-MXKC68
CA-MXKC38
(MX-KC68B,E,EN,EV)
COPYRIGHT © 2008 Victor Company of Japan, Limited
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
Lead free solder used in the board (material : Sn-Cu, melting point : 230 Centigrade)
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
COPYRIGHT © 2008 Victor Company of Japan, Limited
TABLE OF CONTENTS
No.MB664<Rev.002>
2008/8
SPECIFICATION
MX-KC68J/C/MX-KC38J/C
Amplifier section OUTPUT POWER
Main speakers 110 W per channel min. RMS driven into 3Ω at 1 kHz with no more than 10% total harmonic distortion
Speakers/Impedance 3Ω - 6 Ω
Subwoofer (for MX-KC68) 180 W per channel min. RMS driven into 8 Ω at 63 Hz with no more than 10% total harmonic distortion
Speakers/Impedance 8 Ω - 16 Ω
Tuner section
FM tuning range 87.5 MHz - 108.0 MHz
AM tuning range 530 kHz - 1 710 kHz
CD player section
Dynamic range 90 dB
Signal-to-noise ratio 85 dB
Wow and flutter Immeasurable
Main speakers (MX-KC68/SP-MXKC38)
Type 3-Way 3-Speaker Bass-Reflex Type
Speaker units Main Woofer 16 cm (6-5/16 inches) cone x 1
Mid Range 5 cm (2 inches) cone x 1
Tweeter 2 cm (13/16 inches) dome x 1
Power Handling Capacity 110 W
Impedance 3 Ω
Frequency Range 41 Hz - 35 kHz
Sound Pressure Level 83 dB/W•m
Dimensions (approx.) 210 mm x 315 mm x 220 mm (W/H/D)
(8-5/16 inches x 12-7/16 inches x 8-11/16 inches)
Mass (approx.) 3.0 kg (6.7 lbs) each
Subwoofer (MX-KC68)
Type 1-Way Bass-Reflex Type
Speaker 16 cm (6-5/16 inches) cone x 1
Power Handling Capacity 180 W
Impedance 8 Ω
Frequency Range 38 Hz - 5 kHz
Sound Pressure Level 83 dB/W•m
Dimensions (approx.) 210 mm x 315 mm x 242 mm (W/H/D)
(8-5/16 inches x 12-7/16 inches x 9-9/16 inches)
Mass (approx.) 3.4 kg (7.5 lbs)
General
Power requirements AC 120 V , 60 Hz
Audio input AUDIO IN 400 mV/47 kΩ
Power supply to iPod DC 5 V 500 mA
Power consumption 95 W (MX-KC68) - power on
60 W (MX-KC38) - power on
9 W - standby mode, without charging iPod
0.9 W or less - save mode
Dimensions (W x H x D) 215 mm x 307 mm x 309 mm
(8-1/2 inches x 12-1/8 inches x 12-3/16 inches)
Mass (approx.) 3.8 kg (8.4 lbs) (MX-KC68)
3.6 kg (8.0 lbs) (MX-KC38)
Specifications and appearance are subject to change without prior notice.
1-2 (No.MB664<Rev.002>)
MX-KC68B/E/EN/EV
Amplifier section
OUTPUT POWER Main speakers
Subwoofer
Tuner section FM tuning range 87.50 MHz - 108.00 MHz
AM tuning range 522 kHz - 1 629 kHz
CD player section Dynamic range 86 dB
Signal-to-noise ratio 85 dB
Wow and flutter Immeasurable
Main speakers
(SP-MXKC68F)
Subwoofer
(SP-MXKC68W)
Power requirements AC 230 V , 50 Hz
Audio input AUDIO IN 400 mV/47 kΩ
Power supply to iPod DC 5 V 500 mA
Power consumption 95 W - power on
Dimensions (W x H x D) 215 mm x 307 mm x 309 mm
Mass (approx.) 3.8 kg
Specifications and appearance are subject to change without prior notice.
Type 3-Way 3-Speaker Bass-Reflex Type
Speaker units Main Woofer 16 cm cone x 1
Power Handling Capacity 110 W
Impedance 3 Ω
Frequency Range 41 Hz - 35 kHz
Sound Pressure Level 83 dB/W
Dimensions (approx.) 210 mm x 315 mm x 220 mm (W/H/D)
Mass (approx.) 3.0 kg each
Type 1-Way Bass-Reflex Type
Speaker 16 cm cone x 1
Power Handling Capacity 180 W
Impedance 8 Ω
Frequency Range 38 Hz - 5 kHz
Sound Pressure Level 83 dB/W
Dimensions (approx.) 210 mm x 315 mm x 242 mm (W/H/D)
Mass (approx.) 3.4 kg
110 W per channel min. RMS driven into 3 Ω at 1 kHz with no more than 10% total harmonic distortion
Speakers/Impedance: 3 Ω - 6 Ω
180 W min. RMS driven into 8 Ω at 63 Hz with no more than 10% total harmonic distortion
Speakers/Impedance: 8 Ω - 16 Ω
Speakers
Mid Range 5 cm cone x 1
Tweeter 2 cm dome x 1
•m
•m
General
9 W - standby mode, without charging iPod
0.8 W or less - save mode
(No.MB664<Rev.002>)1-3
MX-KC68A/UJ/UW
Amplifier section
OUTPUT POWER Main speakers
Subwoofer
FM tuning range 87.50 MHz - 108.00 MHz
AM tuning range 531 kHz - 1 710 kHz (at 9 kHz intervals)
Dynamic range 86 dB
Signal-to-noise ratio 85 dB
Wow and flutter Immeasurable
Main speakers (SPMXKC68F)
Subwoofer
(SP-MXKC68W)
Power requirements For Australia AC 240 V , 50 Hz
Audio input AUDIO IN 400 mV/47 kΩ
Power supply to iPod DC 5 V 500 mA
Power consumption 95 W - power on
Dimensions (W x H x D) 215 mm x 307 mm x 309 mm
Mass (approx.) 3.8 kg
Specifications and appearance are subject to change without prior notice.
Type 3-Way 3-Speaker Bass-Reflex Type
Speaker units Main Woofer 16 cm cone x 1
Power Handling Capacity 110 W
Impedance 3 Ω
Frequency Range 41 Hz - 35 kHz
Sound Pressure Level 83 dB/W
Dimensions (approx.) 210 mm x 315 mm x 220 mm (W/H/D)
Mass (approx.) 3.0 kg each
Type 1-Way Bass-Reflex Type
Speaker 16 cm cone x 1
Power Handling Capacity 180 W
Impedance 8 Ω
Frequency Range 38 Hz - 5 kHz
Sound Pressure Level 83 dB/W
Dimensions (approx.) 210 mm x 315 mm x 242 mm (W/H/D)
Mass (approx.) 3.4 kg
For other countries AC 110 V-127 V/AC 220 V-240 V adjustable with the voltage selector 50 Hz/60 Hz
110 W per channel min. RMS driven into 3 Ω at 1 kHz with no more than 10% total harmonic distortion
Speakers/Impedance: 3 Ω - 6 Ω
180 W per channel min. RMS driven into 8 Ω at 63 Hz with no more than 10% total harmonic distortion
Speakers/Impedance: 8 Ω - 16 Ω
Tuner section
530 kHz - 1 710 kHz (at 10 kHz intervals)
CD player section
Speakers
Mid Range 5 cm cone x 1
Tweeter 2 cm dome x 1
•m
•m
General
9 W - standby mode, without charging iPod
0.8 W or less - save mode
1-4 (No.MB664<Rev.002>)
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.MB664<Rev.002>)1-5
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 card wire is disconnected from the connecto on the servo board. (If the card 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 card wire.
Solder short land section
1-6 (No.MB664<Rev.002>)
1.8 Important for laser products
1.CLASS 1 LASER PRODUCT
2.CAUTION :
(For U.S.A.) Visible and/or invisible class II laser radiation
when open. Do not stare into beam.
(Others) Visible and/or invisible class 1M laser radiation
when open. Do not view directly with optical instruments.
3.CAUTION : Visible and/or invisible laser radiation when
open and inter lock failed or defeated. Avoid direct
exposure to beam.
4.CAUTION : This laser product uses visible and/or invisible
laser radiation and is equipped with safety switches which
prevent emission of radiation when the drawer is open and
the safety interlocks have failed or are defeated. It is
dangerous to defeat the safety switches.
5.CAUTION : If safety switches malfunction, the laser is able
to function.
6.CAUTION : Use of controls, adjustments or performance of
procedures other than those specified here in may result in
hazardous radiation exposure.
!
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
REPRODUCTION AND POSITION OF LABELS and PRINT
WARNING LABEL and PRINT
(No.MB664<Rev.002>)1-7
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