JVC MX-KB15, MX-KB2 Service Manual
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MB28720048
MX-KB2,MX-KB15
Area suffix
C ------------------------- Canada
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31
COPYRIGHT © 2004 Victor Company of Japan, Limited
No.MB287
2004/8
SPECIFICATION
Amplifier Output Power 40 W(MX-KB2), 30 W(MX-KB15) 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:500 mV/51 kΩ
Speaker terminals 6 - 16 Ω
Phones 32 Ω - 1 kΩ
Cassette Deck Section Frequency Response 20 mW/ch output into 32 Ω
Type I (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 Tuning Range:87.5 MHz - 108.0 MHz
AM Tuner Tuning Range:(MW) 530 kHz - 1 710 kHz
Unit Dimensions 276 mm × 315 mm × 456 mm (W/H/D) (10-15/16" × 12-7/16" × 18")
Mass Approx. 8 kg (17.7 lbs)
Speaker Specifications
SP-MXKB2/SP-MXKB15
(each unit)
Power Specifications Power Requirements AC 120 V , 60 Hz
Type 2-way bass-reflex type
Speaker Unit Woofer : 13 cm (5-1/8") cone × 1
Tweeter : 5cm (2") cone × 1
Power Handling Capacity 40 W
Impedance 6 Ω
Frequency Range 65 Hz - 20,000 Hz
Sound pressure level 86 dB/W·m
Dimensions 208 mm × 323 mm × 264 mm (W/H/D) (8-1/4" × 12-3/4" × 10-7/16")
Mass Approx. 3 kg (6.7 lbs)
Power Consumption 83 W (power on mode) 13 W (in Standby mode)
Design and specifications are subject to change without notice.
1-2 (No.MB287)
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.MB287)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.
Card wire
1-4 (No.MB287)
CD pickup board
Short-circuit point
1.8 Importance administering point on the safety
!
!
!
!
!
!
Caution: For continued protection against risk of fire,
replace only with same type 4 A/250 V for F801,
F802, and F804, 2 A/250 V for F802.
This symbol specifies the type of fast operating fuse.
Precaution: Pour la protection continue contre les
risques d'incendie, remplacer uniquement par le
^
meme type: fusible 2 A/250 V pour le F802,
4 A/250 V pour le F801, F803 et F804.
Ce symbole specifie le type de fusible a action rapide.
(No.MB287)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-6 (No.MB287)
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the top cover / side cover (R) and (L)
(See Fig.1 to 6)
(1) From the back of the body, remove the two screws A at-
taching the top cover.
(2) From both sides of the body, remove the four screws B at-
taching the top cover and the side cover (R) and (L). Move
the top cover in the direction of the arrow to release from
the front panel at the two joints a.
(3) Remove the six screws D on the back of the body and the
two screws E on the side of the body. Move the side cover
(R) and (L) backward to release the four joints b on the bottom of the side covers.
A
Top cover
A
B
Front panel assembly
a
Fig.1
Fig.2
Top cover
B
Side cover (R)
(No.MB287)1-7
D D
Side cover (L)
Front panel assembly
Side cover (R)
Front panel assembly
E
Fig.3
b
Fig.4
Side cover (L)
Side cover (R)
b
E
Fig.5
Joint b
Fig.6
1-8 (No.MB287)
3.1.2 Removing the CD fitting
(See Fig.7 to 9)
• Prior to performing the following procedure, remove the top
cover / side cover (R) and (L).
Caution:
For preventing from damage, make sure to remove the CD fitting before detaching the CD changer mechanism unit.
(1) Push STANDBY / ON key to turn power on.
(2) Push CD TRAY EJECT key.
(3) Move the CD fitting in the direction of the arrow to release
from the CD tray at two joints d.
(4) Push STANDBY / ON key to close the tray.
3.1.3 Removing the CD fitting
(See Fig.8 to 10)
< How to eject the CD tray without turning power on >
• Prior to performing the following procedure, remove the top
cover / side cover(R) and (L).
(1) Turn over the CD changer mechanism unit and turn the
loading pulley gear at e in the inner part of the notch of the
main board to move the CD tray forward.
(2) Move the CD fitting in the direction of the arrow to release
from the CD tray at two joint d.
(3) Manually push and close the CD tray.
CD changer mechanism unit
CD fitting
d
CD tray
CD fitting
Fig.8
CD tray
STANDBY / ON
Front panel assembly
CD TRAY EJECT
Fig.9
CD changer mechanism
Main board
Fig.7
Loading pullygear
Fig.10
e
(No.MB287)1-9
3.1.4 Removing the CD changer mechanism unit
(See Fig.11 to 16)
• Prior to performing the following procedure, remove the top
cover / side cover (R) and (L), and the CD fitting.
(1) Disconnect the wire from connector CN601 on the turner
board on the right side of the body.
(2) Disconnect the wire from connector CN504
board on the inner side of the front panel.
(3) Disconnect the wire from connector CN801
on the power board.
CN803
(4) Disconnect the wire from connector CN100, CN101 and
on the main board at the bottom of the CD changer
CN207
mechanism unit, and disconnect the card wire from connector CN103
wires.
(5) From the side of the body, remove the two screws F attach-
ing the CD changer mechanism unit.
(6) From the back of the body, remove the two screws G at-
taching the CD changer mechanism unit.
(7) Move the CD changer mechanism unit in the direction of
the arrow while pulling the rear panel backward, and remove the CD changer mechanism unit.
. If necessary, release the band attaching the
on the AUX
, CN802 and
CD changer mechanism unit
F
AUX board
CN504
Front panel assembly
Rear panel
Rear panel
Turner board
CN601
Fig.11
CD changer mechanism unit
Front panel assembly
Fig.12
F
1-10 (No.MB287)
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