JVC MX-KB22 User manual

SERVICE MANUAL
COPYRIGHT © 2004 Victor Company of Japan, Limited No.MB306
2004/8
COMPACT COMPONENT SYSTEM
MB30620048
MX-KB22, MX-KB1
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
CA-MXKB22SP-MXKB22 SP-MXKB22
CA-MXKB1SP-MXKB1 SP-MXKB1
Area suffix
EV ------------- Eastern Europe
MX-KB22
Area suffix
B ------------------------------ U.K.
E ---------- Continental Europe
EN ----------- Northern Europe
EV ------------- Eastern Europe
MX-KB1

1-2 (No.MB306)
SPECIFICATION
Design and specifications are subject to change without notice.
Amplifier Output Power 30 W per channel, min. RMS, driven into 6 Ωat 1kHz, with no more than
10% total harmonic distortion (IEC268-3) 28 W per channel, min. RMS,
driven into 6 Ωat 1kHz, with no more than 0.9 % total harmonic distor-
tion (DIN)
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 Tuning Range FM Tuner 87.50 MHz - 108.00 MHz
AM Tuner (MW) 522 kHz - 1 629 kHz
Unit Dimensions 276 mm ×315 mm ×456 mm (W/H/D)
Mass Approx. 8 kg
Power Specifications Power Requirements AC 230 V , 50 Hz
Power Consumption 83 W (power on mode) 13 W (in Standby mode) Approx. 2 W (in ECO
mode)

(No.MB306)1-3
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purpos-
es. 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 per-
formed 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 characteris-
tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us-
ing replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Ser-
vice 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 charac-
teristics 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 reassem-
bling.
(5) Leakage shock hazard testing
After reassembling the product, always perform an isola-
tion check on the exposed metal parts of the product (an-
tenna 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, particular-
ly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage cur-
rent 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, 1,000Ωper volt or more sensitivity
in the following manner. Connect a 1,500Ω10W 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.).
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 pre-
forming 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)
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE

1-4 (No.MB306)
1.5 Safety Precautions (U.K only)
(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-
tinued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replace-
ment parts must be identical to those used in the original circuits.
(2) Any unauthorised design alterations or additions will void the manufacturer's guarantee; furthermore the manufacturer cannot
accept responsibility for personal injury or property damage resulting therefrom.
(3) Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never
be replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts in
the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts
other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts
shown in the Parts List of the Service Manual and 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 re-assembling.
1.5.1 Warning
(1) Service should be performed by qualified personnel only.
(2) This equipment has been designed and manufactured to meet international safety standards.
(3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(4) Repairs must be made in accordance with the relevant safety standards.
(5) It is essential that safety critical components are replaced by approved parts.
(6) If mains voltage selector is provided, check setting for local voltage.
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.

(No.MB306)1-5
1.6 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.
1.6.1 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.
(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.
1.7 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.
1.8 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.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap
CD pickup board
Short-circuit point
Card wire

1-6 (No.MB306)
1.9 Important for laser products
1.CLASS 1 LASER PRODUCT
2.DANGER : Invisible laser radiation when open and inter
lock failed or defeated. Avoid direct exposure to beam.
3.CAUTION : There are no serviceable parts inside the
Laser Unit. Do not disassemble the Laser Unit. Replace
the complete Laser Unit if it malfunctions.
4.CAUTION : The CD,MD and DVD player uses 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.
REPRODUCTION AND POSITION OF LABELS
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
!
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
CLASS 1
LASER PRODUCT
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
WARNING LABEL

(No.MB306)1-7
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-8 (No.MB306)
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 Aat-
taching the top cover.
(2) From both sides of the body, remove the four screws Bat-
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 Don the back of the body and the
two screws Eon the side of the body. Move the side cover
(R) and (L) backward to release the four joints bon the bot-
tom of the side covers.
Fig.1
Fig.2
AA
Top cover
Top cover
Front panel assembly Side cover (R)
BaB

(No.MB306)1-9
Fig.3
Fig.4
Fig.5
Fig.6
D D
Side cover (R) Side cover (L)
Side cover (R)
Front panel assembly
Eb
E
b
Side cover (L) Front panel assembly
Joint b

1-10 (No.MB306)
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 fit-
ting 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.
Fig.7
Fig.8
Fig.9
Fig.10
CD TRAY EJECT
STANDBY / ON
CD fitting
CD changer mechanism unit
Front panel assembly
d
CD fitting
CD tray
CD tray
e
Main board
CD changer mechanism
Loading pullygear

(No.MB306)1-11
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 on the AUX
board on the inner side of the front panel.
(3) Disconnect the wire from connector CN801, CN802 and
CN803 on the power board.
(4) Disconnect the wire from connector CN100, CN101 and
CN207 on the main board at the bottom of the CD changer
mechanism unit, and disconnect the card wire from con-
nector CN103. If necessary, release the band attaching the
wires.
(5) From the side of the body, remove the two screws Fattach-
ing the CD changer mechanism unit.
(6) From the back of the body, remove the two screws Gat-
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 re-
move the CD changer mechanism unit.
Fig.11
Fig.12
Turner board
CN601
AUX board
CN504
Front panel assembly
F
CD changer mechanism unit Rear panel
Front panel assembly
F
CD changer mechanism unit
Rear panel

1-12 (No.MB306)
Fig.13
Fig.14
Fig.15
Fig.16
AUX board
CN504
Front panel assembly
CN802 Power board
CN803
CN801
CD changer mechanism unit
CN207
CN101
CN100
CN103
Main board
CD changer mechanism unit
G
G
Rear panel

(No.MB306)1-13
3.1.5 Removing the tuner board
(See Fig.17, 18)
• Prior to performing the following procedure, remove the top
cover / side cover (R) and (L).
(1) Disconnect the wire from connector CN601 on the tuner
board.
(2) From the back of the body, remove the two screws H, the
two screws Jand the two screws Kattaching the tuner
board respectively.
(3) Remove the two screws Lattaching the tuner board holder.
Caution:
You can remove the tuner board without removing the CD
changer mechanism unit and the rear panel.
Fig.17
Fig.18
H
K
J
Tuner board
CN601
Tuner board
Tuner board holder
L

1-14 (No.MB306)
3.1.6 Removing the speaker terminal board
(See Fig.19, 20)
• Prior to performing the following procedure, remove the top
cover / side cover (R) and (L).
(1) Disconnect the wire from connector CN901 on the speaker
terminal board.
(2) From the back of the body, remove the two screws Mat-
taching the speaker terminal board.
Reference:
You can remove the speaker terminal board without detaching
the CD changer mechanism unit and the rear panel.
Fig.19
Fig.20
Speaker terminal board CN901
Rear panel
M
Rear panel
Rear cover

(No.MB306)1-15
3.1.7 Removing the front panel assembly
(See Fig.21 to 24)
• Prior to performing the following procedure, remove the top
cover / side cover (R) and (L), the CD fitting / CD changer
mechanism unit.
(1) Disconnect the wire from connector CN861 on the power
board.
(2) Disconnect the earth wire from the base chassis on the bot-
tom of the right side of the body.
(3) From the bottom of the body, remove the two screws Nat-
taching the front panel assembly.
(4) Release the two joints fon the side of the body and the joint
gon the bottom using a screwdriver, and remove the front
panel assembly forward.
Fig.21
Fig.22
Rear panel
Power board
CN861
Earth wire
f
Front panel assembly

1-16 (No.MB306)
Fig.23
Fig.24
f
Front panel assembly
N
N
Front panel assembly

(No.MB306)1-17
3.1.8 Removing the POWER switch board / CD switch board
(See Fig.25, 26)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the two screws Pand the three screws Qattach-
ing the bracket.
(2) Remove the screws Rattaching the POWER switch board.
(3) Remove the screw Tattaching the CD switch board.
Fig.25
Fig.26
3.1.9 Removing the REC select switch board / PROGRAM select switch board
(See Fig.27)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the three screws Uattaching the REC select
switch board.
(2) Remove the three screws Yattaching the CD switch board.
Fig.27
PQP
Front panel assembly
Bracket
RT
CD switch boardPower switch board
Front panel assembly
Y
Y
PROGRAM select
switch boaed REC select
switch boaed
U
U
Front panel assembly

1-18 (No.MB306)
3.1.10 Removing the LCD board / STANDBY board
(See Fig.28, 29)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the four screws A’ attaching the LCD board and
disconnect the wire from connector CN505.
(2) Remove the two screws B’ attaching the STANDBY board.
Fig.28
Fig.29
LCD board
CN505
A'
A'
Front panel assembly
B'
STANDBY board
Front panel assembly

(No.MB306)1-19
3.1.11 Removing the system board / headphone board / AUX board
(See Fig.30 to 34)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Pull out the volume knob on the front side of the front panel
assembly. Release the three tabs of the knob holder and
pull out the knob holder.
(2) Remove the nut and the washer from the volume shaft.
(3) From the back of the front panel assembly, remove the sev-
enteen screws D’ attaching the system board.
(4) Remove the screw E’ attaching the headphone board fit-
ting plate and pull out the headphone board.
(5) Remove the screw F’ attaching the AUX board fitting plate
and pull out the AUX board.
Fig.30
Fig.31
Volume knob
Front panel assembly
Nut
Washer
Knob holder
Tab
System board D'
D'
D'
D'
Front panel assembly

1-20 (No.MB306)
Fig.32
Fig.33
Fig.34
Headphone board
Fitting plate
E'
Front panel assembly
AUX board
Fitting plate
F'
Front panel assembly
G'
G'
Cassette mechanism assembly
Front panel assembly