Design and specifications are subject to change without notice.
1-2 (No.MB434)
SECTION 1
PRECAUTION
1.1Safety 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
1.2Warning
(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.
1.3Caution
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.
1.4Critical 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.MB434)1-3
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-4 (No.MB434)
SECTION 3
DISASSEMBLY
3.1Disassembly 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 (F901)
1.6AL 250V
Fig.1
W
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
B
Fig.3
(No.MB434)1-5
3.1.4 Removing the top cover right cabinet and left cabinet
(See Fig.4 and 5)
(1) Remove three screws C that retain the top cover from the
panel rear of the body.
(2) Remove six screws D that retain the left cabinet from the
body.
(3) Remove six screws c that retain the right cabinet from the
body.
right cabinet
top cover
left cabinet
C
C
Right Front panel assembly
C
Fig.5
C
D
Fig.4
Left Front panel assembly
C
D
1-6 (No.MB434)
3.1.5 Removing the CD changer unit
(See Fig.6 to 8)
• Prior to performing the following procedures, remove the top
cover.
Caution:
Although the CD mechanism unit can be removed without removing the CD tray panel, it is still recommended to remove it
in order to prevent damage.
• From the front panel side of this set, push in the sections
marked with arrows and pull out the CD tray toward the front.
• Remove the CD tray panel by pushing both of its extremities
upward in the direction of the arrows.
• Push the CD tray deep into the set.
(1) Disconnect the cord wires from the CD board CN703
CN203.
(2) From the rear of the set, remove two screws E, and four
screws G on the front panel left and right side.
(3) Handle the CD changer unit rear, take out the unit.
and
UP
UP
CD tray panel
Fig.6
E
Fig.7
Fig.8
G
(No.MB434)1-7
3.1.6 Removing the front panel assembly
(See Fig.9 to 10)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
(1) Disconnect the parallel wire and the cord wire from the con-
nectors CN701
(2) Remove one screws H retaining the front panel assembly
onto the bottom of the body.
(3) Remove two screws I on the front cabinet and bottom cab-
inet and then remove then GND lug b that comes from the
power amp and supply board.
(4) Disengage the claws c on both sides of the front panel as-
sembly and then remove the assembly.
, CN101 on the power amp. board.
I
H
Fig.9
Claw
c
GND lug
GND lug
a
b
Fig.10
1-8 (No.MB434)
3.2Disassembly of units and assembly inside this set
3.2.1 Removing the Main board
(See Fig.11 to 12)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
(1) Disconnect the wires from CN603A
on the Main board, which is located on the back side of the
CD changer unit.
(2) The four screws J that retain the CD board should be re-
moved.
(3) Remove the CD board by pulling it toward the side where
the CN601
(4) Using solder, short the CD pickup to connect to short
round.
Caution:
After re-connecting the wires, be sure to remove the
shorting solder from the GND connection.
(5) Disconnect the card wire from the connector CN601
Main board and then remove the Main board.
is located.
, CN603B and CN604
on the
J
Main board
J
J
CD board
Fig.11
CN601
Short round
Fig.12
(No.MB434)1-9
3.2.2 Removing the CD changer mechanism assembly
(See Fig.13 to 14)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
(1) Turn the CD changer mechanism cover base and remove
the screws d connecting the unit to the CD changer mechanism assembly.
(2) Removing four screws e retaining the CD mechanism hold-
er assembly.
Caution:
When replacing the CD changer mechanism assembly, be
sure not to mistake the positions of the silver color and copper
color spring.
CD changer
unit
e
( Green color )
e
( Green color )
d
Fig.13
CD changer
mechanism
assemb
ly
Fig.14
e
( Red color )
e
( Red color )
1-10 (No.MB434)
3.2.3 Removing the CD pickup
r
(See Fig.15)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
• Also remove the CD changer mechanism.
(1) Widen the section f.
(2) While keeping the section f wide open, push the section g
in the direction of the arrow to remove the shaft, and then
remove the CD pickup.
CD pickup
f
3.2.4 Replacing the loading motor and rotor belt of the CD changer
(See Fig .16)
• Prior to performing the following procedures, remove the top
cover.
• Also open the CD changer tray.
(1) Remove the two screws L retaining the CD changer tray
loading motor.
(2) Remove the two screws M retaining the gear plate and take
it out, after remove the rotor belt from the pulley.
g
Shaft
Fig.15
M
L
3.2.5 Replacing the CD turn table and removing the motor
(See Fig. 17)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
(1) Remove the one screw retaining the CD (Turn table).
(2) Remove the two screws retaining the stopper brackets on
both sides of the CD changer unit.
(3) Remove the stopper brackets from both sides of the CD
changer unit.
(4) Pull out the CD tray from the CD changer unit, all the way
and lift the tray to remove.
(5) Remove the gear and after push out the tray motor locker
and pull out the tray motor from the CD tray.
Fig.16
Turn table motor
Motor locker
Obligue gea
Fig.17
(No.MB434)1-11
3.2.6 Removing the cassette deck mechanism
(See Fig.18)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
• Also remove the front panel assembly.
(1) Remove six screws retaining the cassette deck mecha-
nism.
3.2.7 Removing the key open board & the key REC board
(See Fig.19)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
• Also remove the front panel assembly.
(1) Remove 25 screws P that retains the key open board.
Front panel
Front board
assembly
Fig.18
Front panel
assembly
Z
Z
P
3.2.8 Removing the display board
(See Fig.20)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
• Also remove the front panel assembly.
(1) Remove 25 screws Q that retain the front board from the
back of the front panel unit.
1-12 (No.MB434)
Display board
Fig.19
Q
Fig.20
3.2.9 Removing the Switch board and sound mode and CD function switch board
(See Fig.19 to 22)
• Prior to performing the following procedures, remove the top
cover.
• Also remove the CD changer unit.
• Also remove the front panel assembly.
(1) Pull out the volume control knob from the front of the front
panel assembly.(Fig.21)
(2) Remove six screws Q retaining the front panel assembly.
(3) Remove the Control/FL board.
(4) Remove eleven screws R retaining the Switch (key 1)
board.(Fig.19)
(5) Remove two screws S retaining the sound mode and CD
function (key 2) switch board.(Fig.20)
Front panel assembly
Volume knob
Front panel
assembly
Fig.21
Volum
shaft
Fig.22
(No.MB434)1-13
3.2.10 Removing the cassette deck main motor, and replacing the main belts
r
(See Fig.18, 23 and 24)
• Prior to performing the following procedures, remove the top
cover and both sides board.
• Also remove the CD changer unit.
• Also remove the front panel assembly.
(1) Remove six screws Z retaining the cassette deck mecha-
nism. (Fig.18)
(2) Remove the cassette deck mechanism.
(3) Remove two screws t retaining the main motor from the
front side of the cassette deck.
Caution:
After attaching the main motor, check the orientation of
the motor and the polarity of the wires.
(4) From the backside of the cassette deck, remove the main
motor and two main belts.
Caution:
The lengths of the cassette A(playback only) and cassette
B(record/play) main belts are different. When attaching the
main belts, use the longer belt for cassette A.
Cassette deck mechanism
Cassette deck mechanism
(Back side)
(Front side)
t
Fig.23
Cassette deck main moto
3.2.11 Removing the leaf switches of the cassette deck mechanism
(See Fig. 18 and 25)
• Prior to performing the following procedures, remove the top
cover and both sides board.
• Also remove the CD changer unit.
• Also remove the front panel assembly.
(1) Remove the six screws Z that retain the cassette deck
mechanism. (Fig.18)
(2) Remove the cassette deck mechanism.
(3) Turn the cassette deck mechanism upside down.
(4) Remove the solder from around the leaf switches.
(5) Pull out the leaf switches from the front side of the cassette
deck mechanism.
Main belt
(For B cassette)
Cassette deck mechanism
Main belt
(For A cassette)
Fig.24
Solder side of leaf switch
(Back side)
Fig.24
1-14 (No.MB434)
3.2.12 Removing the cassette deck heads
(See Fig. 18 and 26)
• Prior to performing the following procedures, remove the top
cover and both sides board.
• Also remove the CD changer unit.
• Also remove the front panel assembly.
(1) Remove six screws Z that retain the cassette deck mecha-
nism. (Fig.18)
(2) Remove the cassette deck mechanism and place it so that
the front side faces up.
(3) Remove the solder from the bottom side of the head termi-
nal and disconnect the wire.
(4) Remove screws U that retains the head.
(5) Remove screws V that retains the head.
(6) Hold the head and slide it in the direction of the arrow to re-
move it.
Cassette dec k mechanism
(Front side)
3.2.13 Removing the 3-pin regulator and bridge diode
(See Q604, Q608, D614, D615 and Fig.27)
• Prior to performing the following procedures, remove the top
cover and both sides board.
(1) Remove two screws A that connect the heat sink.
(2) Remove two screws W that connect the heat sink.
(3) Remove the solder fixing the 3-pin terminal regulator Q604,
Q608.
(4) Remove the solder fixing the 4-pin bridge diode (D614,
D615).
PB Head
V
U
Fig.26
W
Fig.27
VU
REC/PB Head
A
(No.MB434)1-15
3.2.14 Removing the power amp and Supply board and the Power trans board
(See Fig. 2, 28 to 30)
• Prior to performing the following procedures, remove the top
cover and CD changer unit.
(1) Remove four screws B from the rear panel. (Fig.3)
(2) Pull the heat sink cover outward.
(3) Remove four screws AA from the rear panel between the
heat sink holder.
(4) Remove two screws YY that retains the rear panel, and
then remove the rear panel.
(5) Disconnect the parallel wires from the connectors FW951
on the Power trans board.
(6) Remove screws Z that retain the power amp and Supply
board and then remove the assembly.
(7) Remove the clamp of AC power cord from the chassis.
(8) Remove four screws that retain the Power trans board and
then remove the assembly.
Fuse (F901)
1.6AL 250V
Fig.28
Rear panel
YY
Clamp
Fig.29
Power amp and supply board
Z
Fig.30
Chassis
1-16 (No.MB434)
SECTION 4
ADJUSTMENT
This service manual does not describe ADJUSTMENT.
SECTION 5
TROUBLESHOOTING
This service manual does not describe TROUBLESHOOTING.
(No.MB434)1-17
Victor Company of Japan, Limited
AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
(No.MB434)
Printed in Japan
VPT
SCHEMATIC DIAGRAMS
COMPACT COMPONENT SYSTEM
MX-KC2
CD-ROM No.SML200510
Area suffix
UW ----------- Brazil,Mexico,Peru
UY ------------------------ Argentina
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
Contents
Block diagram
Standard schematic diagrams
Printed circuit boards
COPYRIGHT 2005 Victor Company of Japan, Limited.
CA-MXKC2SP-MXKC2SP-MXKC2
2-1
2-2
2-8 to 13
No.MB434SCH
2005/10
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.
Block diagram
Pickup ass'y
Loader ass'y
VREF
SVCC
A B C D E F
GND
T+ TF+ F-
SP+/- SL+/IN-SW
MO+/- RL+/-
5V
SENSE CATHODE
SW1-2
LD
VR
PD
Motor
driver
SPDRV
TRVDRV
FG
FODRV
DRVMUTE
SPMUTE
VHALF
16.93MHz
ASP
Main board
16M SDRAM
DB0-7
ADD0-10
BA0 RAS CAS DRW
LDQM CKE
XSCLK UDQM
CD / MP3
DECODER
3.3V
1.8V
M8V
D5V
3.3V
regulator
1.8V
regulator
FAOUTL
FAOUTR
VFD DISPLAY
VFD
driver
TUNER MODULE
FM / AM
ST LED
9V
TUNER-L
GND
TUNER-R
CE1
DATA IN
CLK1
DATA OUT
D-GND
NG
NG
AUX
AC IN
Voltage supply
Main
transf.
Primary fuse
Sub-transf.
<=1.5W
Rellay
DISPLAY O/P
SYSTEM MICON
TU CONT.
Main board
CD L/R
TU L/R
AUX L/R
FUNC IC
VOLUME
FUNCTION SW
SURROUND
VOLTAGE SUPPLY
MAIN CH
6 OHM6 OHM
POWER AMP
Main board
HEADPHONE
VOLTAGE SUPPLY
HP OUT
2-1
Standard schematic diagrams
Primary section
2-2
Parts are safety assurance parts.
When replacing those parts make
sure to use the specified one.
Power amp. section
Parts are safety assurance parts.
When replacing those parts make
sure to use the specified one.
2-3
Micon section
2-4
Source selector section
2-5
CD section
2-6
Front section
2-7
Printed circuit boards
Main board
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
forward side
2-8
Main board
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
reverse side
2-9
Amp board
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
forward sidereverse side
2-10
Front board
forward side
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
2-11
Front board
reverse side
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
2-12
Trans board
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
2-13
Victor Company of Japan, Limited
AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
(No.MB434SCH)
Printed in Japan
VPT
PARTS LIST
[ MX-KC2 ]
* All printed circuit boards and its assemblies are not available as service parts.
Area suffix
UW ---------- Brazil,Mexico,Peru
UY ----------------------- Argentina
MB434
- Contents -
Exploded view of general assembly and parts list (Block No.M1)
CD changer mechanism assembly and partslist (Block No.MA)
Electrical parts list (Block No.01~05)
Packing materials and accessories parts list (Block No.M3)
3P for CASS MECH
to MAIN CN301
8P for CASS MECH
to MAIN CN302
18P for FRONT
CW201 to MAIN
CN201
9P for CASS MECH
to MAIN CN303
12P for TUNER to
MAIN CN306
24P for AMP CW501
to MAIN CN601
1/10W
3-13
Packing materials and accessories parts list
A
Block No.
M
3
M
M
A4
P9
P3
P4
A6
7
P10
A8
P5
A3
A5
P8
P2
A1 A2
P6
3-14
P7
P1
Packing and Accessories
Symbol No.Part No.Part NameDescriptionLocal
A 1BI440001553000INST BOOKENG SPA POR LVT1346-006AUW
A 1BI440001552000INST BOOKSPA LVT1346-007AUY
A 2BI23A0094VPLUG CONVERSIONJT-0476
A 3------------BATTERY(x2)
A 4BIAN01051FM ANT WIRE
A 5BIAN01031VAM LOOP ANT
A 6BI643MXKC206SXREMOTE CONTROL
A 7MXKC2UW-SPBOX-LSPEAKER BOX LBI644MXKC2238SUW
A 7MXKC2UY-SPBOX-LSPEAKER BOX LBI644MXKC2209SUY
A 8MXKC2UW-SPBOX-RSPEAKER BOX RBI644MXKC2238SUW
A 8MXKC2UY-SPBOX-RSPEAKER BOX RBI644MXKC2209SUY
P 1BI430001863000CARTON
P 2BI470011031001POLY BAG
P 3BI470011057001POLY BAG
P 4BI4005355POLY BAGfor Remote control
P 5BI450012028000POLY FORM L
P 6BI450012029000POLY FORM R
P 7BI450011145001MAT SHEET
P 8BI470011032001POLY BAGunit
P 9BI450012006000POLY FORMTOP
P 10BI450012007000POLY FORMBOTTOM
Block No. [M][3][M][M]
3-15
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