JVC MXSK-1 Service manual
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MB20720043
MX-SK1
M X - S K 3
DISC
U
M
L
O
V
SELECT
E
SELECT
EJECTEJECT
SP-MXSK1
STANDBY/ON
SLEEP
AUX
FM/AM
FM MODE
ON SCREEN
VIDEO INTRO
HIGHLIGHT
PREV. NEXT
SET
RETURN
ENTER
PBC STILL KEY CONTROL
DISC
DISC
1
DISC 2DISC
3
PROGRAM
REPEATPROGRAM RANDOM
CANCEL
REC
SOUND
TAPE-A
TAPE-B
TURBO
START/STOP
SOUND
KARAOKE MPX
MODE
ACTIVE
FADE
ECHO
BASS EX.
MUTING
VOLUME
REMOTE CONTROL
COMPACT
COMPACT
COMPACT
DIGITAL VIDEO
ACTIVE
BASS EX.
PHONES
CA-MXSK1SP-MXSK1
Area suffix
DIGITAL VIDEO
DIGITAL AUDIO
EE --------- Russian Federation
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
No.MB207
2004/4
SPECIFICATION
Amplifier section
Output Power MAIN SPEAKERS 64 W per channel min. RMS both channels driven into
6 Ω at 1 kHz with no more than 0.9% total harmonic
distortion.
Audio input sensitivity/Impedance
(Measured at 1 kHz with tape recording signal 300 mV)
FM tuning range 87.50 MHz to 108.00 MHz
AM tuning range At 9 kHz intervals 531 kHz to 1 710 kHz
CD capacity 3 CDs
Dynamic range 85 dB
Signal-to-noise ratio 90 dB
Wow and flutter Immeasurable
Frequency response Normal (type I) 50 Hz to 14 000 Hz
Wow and flutter 0.15% (WRMS)
Power requirement AC 110 V / AC 127 V / AC 220 V / AC 230 V to AC 240 V (adjustable with the voltage selector)
Power consumption 50 Hz / 60 Hz
Dimensions (approx.) 270 mm x 306 mm x 433.5 mm (W/H/D)
Mass (approx.) 9.2 kg
Type 3-Way 3 Speaker Bass-Reflex (Magnetically-Shielded Type)
Speakers Main woofer 15cm cone x 1
Power Handling Capacity 80 W
Impedance 6 Ω
Frequency Range 42 Hz to 30 000Hz
Sound Pressure Level 84 dB/W.m
Dimensions (W x H xD) 215mm x 306 mm x 243 mm
Mass 3.4 kg
Design & specifications are subject to change without notice.
AUX 400 mV/50 kΩ
MIC 3 mV/10 kΩ
Tuner
At 10 kHz intervals 530 kHz to 1 710 kHz
CD player
Cassette deck
General
100 W (at operation)
20 W (on standby)
Speaker Specifications
Mid Range 5.0cm cone x 1
Tweeter 2.0cm dome x 1
1-2 (No.MB207)
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.MB207)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 CD players.
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 CD pickup unit.
• Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the CD servo board. (If the
flexible wire is disconnected without applying solder, the CD 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.
1-4 (No.MB207)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
(No.MB207)1-5
SECTION 3
AA
DISASSEMBLY
3.1 Main body
3.1.1 Removing the metal cover
(See Fig.1~3)
(1) Remove the six screws A on the back of the main body.
(2) Remove the four screws B on each side of the body.
(3) Remove the metal cover from the body by lifting the rear
part of the cover.
CAUTION :
Do not break the front panel tab fitted to the metal cover.
A
B
Fig.1
Fig.2
B
1-6 (No.MB207)
Fig.3
3.1.2 Removing the CD fitting
(See Fig.4~6)
• Prior to performing the following procedure, remove the metal
cover.
ATTENTION :
Be sure to remove the CD tray fitting before removing the
CD changer unit.
(1) Press the STANDBY button. Press the OPEN/CLOSE but-
ton to eject the CD trey.
(2) Move the CD trey fitting upward and release the joint a.
(3) Press the OPEN/ CLOSE button to insert the tray.
CD tray
STANDBY / ON button
CD tray fitting
Joint
OPEN / CLOSE button
Fig.4
a
Joint a
CD tray
Fig.5
Fig.6
(No.MB207)1-7
3.1.3 Removing the CD fitting
(See Fig.5~7)
• How to eject the CD trey without turning on power.
(1) Turn the loading pulley gear marked b from the back of
the CD changer unit as shown in Fig.7 and draw the CD
tray toward the front.
(2) Move the CD tray fitting upward and release the joint a.
(3) Push and insert the CD tray manually.
3.1.4 Removing the CD changer unit
(See Fig.8 ~10)
• Prior to performing the following procedure, remove the metal
cover and the CD fitting.
(1) Disconnect the wire from connector CN13
board.
(2) On the right side of the body, disconnect the card wire from
connector CN651
changer unit.
(3) Remove the four screws D attaching the CD changer unit
on both sides of the body.
(4) Remove the three screws E on the back of the body.
(5) Move the CD changer unit in the direction of the arrow with
pulling the rear panel and the front panel assembly out-
ward.
CD changer unit
on the CD board in the bottom of the CD
on the main
Rear panel
D
Rear panel
CN651
Marked
Loading pulley gear
Fig.7
Main borad
(CN13)
Fig.9
b
CD changer unit
D
Front panel assembly
Front panel assembly
1-8 (No.MB207)
Main borad
(CN13)
Fig.8
E
E
CN651
Rear panel
Fig.10
3.1.5 Removing the CD board
(See Fig.11~13)
• Prior to performing the following procedure, remove the metal
cover and the CD changer unit.
Caution :
Before disconnecting the card wire extending from the CD
pickup, make sure to solder the short-circuit point on the CD
pickup(Fig.12 and 13). If you do not follow this instruction,
the CD pickup may be damaged.
(1) Remove the four screws F attaching the CD board on the
bottom of the CD changer unit.
(2) Turn and move the CD board as shown in Fig.12.
(3) Disconnect the wire from the CD mechanism board.
(4) Solder the short-circuit point on the CD pickup section.
(5) Disconnect the card wire from CN601
Caution :
When reassembling, unsolder the short-circuit point after connecting the card wire to CN601
on the CD board.
on the CD board.
CD changer unit
CD board
FF
CD mechanism board
Fig.11
CD mechanisum board
Short round
(Short-circuit)
Pick up
CD board (CN601)
Fig.12
Card wire
Short round
(short-circuit)
Fig.13
(No.MB207)1-9
3.1.6 Removing the front panel assembly
(See Fig.14~16)
• Prior to performing the following procedure, remove the metal
cover and the CD changer unit.
(1) Disconnect the card wire from the connector CN315,
and CN870 on the main board.
CN316
(2) Disconnect the wire from connector CN702
board and remove the band attaching the wire to the main
board.
(3) Disconnect the wire from the connector CN214
transformer board.
(4) Remove the two screws G attaching the front panel as-
sembly on the bottom of the body.
(5) Remove the two joints d and e on the lower part of the
sides using a screwdriver, and remove the front panel assembly toward the front.
on the speaker
on power
Front panel assembly
Main board
CN870
CN316
CN315
Band
d
Power transformer board
CN214
Front panel assembly
Speaker board
CN702
Fig.14
Front panel assembly
e
Fig.15
G
1-10 (No.MB207)
Fig.16
3.1.7 Removing the tuner pack assembly
(See Fig.17~18)
• Prior to performing the following procedure, remove the metal
cover and the CD changer unit.
(1) Disconnect the card wire from the connector CN1
tuner pack assembly on the right side of the body.
(2) Remove the two screws H on the rear panel on the back
of the body.
on the
Rear panel
Tuner pack
(CN1)
AUX & surround board
Fig.17
H
Rear panel
Fig.18
(No.MB207)1-11
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