JVC MX-K10/30 User manual

No.21137
Jul.2002
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MX-K10/30
Flow of functional
operation until TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-20
1-21
1-21
1-22
Safety precautions
Important for laser products
Preventing static electricity
Disassembly method
Adjustment method
1- 2
1- 3
1- 4
1- 5
1-18
Contents
COPYRIGHT ©2001VICTOR COMPANY OF JAPAN, LTD.
Area Suffix
U ................ ASIA
UW .............. LATIN - AMERICA
MX-K10/30
TENTATIVE

1-2
Safety Precautions
Burrs formed during molding may
be left over on some parts of the
chassis. Theref ore, pay attention to
such burrs in the ca se of pref orm-
ing repair of this system.
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.
(Except the J and C version)
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.
!CAUTION
!
1. This design of this product contains special hardware and many circuits and components
specially or 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 manufacturer`s 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 re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling 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, 1,000
ohms per volt or more sensitivity in the follow-
ing manner. Connect a 1,500
!

1-3
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 compact disc 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 perfor-
mance of procedures other than those specified
herein may result in hazardous radiation exposure.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
CAUTION Please use enough caution not
to see the be am dire ctly or touch
it in ca se of a n adjustment or
operation check.
!

1-4
Preventing static electricity
1. Grounding to prevent damage by 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.
2. About the earth processing for the destruction prevention by static electricity
In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static
electricity of the work environment.
Be careful to use proper grounding in the area where repairs are being performed.
2-1 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.
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
3. Handling the optical pickup
1. 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.)
2. 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.
4. Handling the CD changer unit (optical pickup)
1. Do not subject the CD changer 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. Re-
move the anti-static pin when replacing the CD changer 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. It is not possible to adjust the semi-fixed resistor that ad-
justs the laser power. Do not turn it.
Attention when traverse unit is decomposed
*Please refer to "Disa ssembly method" in the text f or pick
up and how to detach the CD changer mechanism.
1. Remove the CD changer unit.
2. Disconnect the harness from connector on the CD motor
board.
3. Solder is put up before the card wire is removed from connector
Cn601on the main board as shown in Fig.1 and Fig. 2.
(When the wire is removed without putting up solder, the CD
pick-up assembly might destroy.)
4. Please remove solder after connecting the card wire with
CN601 when you install picking up in the substrate.

1-5
Disassembly method
Commence disassembly of this set by removing the main units and then proceed to the components and
assemblies inside the units.
Replacement of the fuses and the power IC
Top cover
CD changer unit
Front panel assembly
Chassis unit
CD changer unit
Removing the main PCB
Removing the CD changer mechanism assembly
Removing the CD pickup
Replacing the loading motor and belt of the CD changer tray
Replacing the CD tray rotor belt of CD changer, and removing the motor
Front panel assembly
Removing the cassette deck mechanism
Removing the earphone jack PCB
Removing the control/FL PCB
Removing the switch PCB and ACTIVE BASS EX. switch PCB
Removing the cassette deck main motor, and replacing the main belts
Removing the leaf switches of the cassette deck mechanism
Removing the cassette deck heads
Chassis unit
Removing the 3-pin regulator
Removing the power amp and supply PCB and the Power Trans PCB
Removing the sub power PCB

1-6
<Disassembly of the main blocks of this set>
Replacement of the fuses and the power IC
Replacing the fuse s (See Fig.1, Fig.4)
  Prior to performing the following procedure, remove
the left side BOARD and remove tuner PCB (Fig.4,BB)
1. Replace the fuses inside.
[Caution] Be sure to use fuses with the specified ratings.
Replacing the power IC (See Fig.2 to 3)
  Prior to performing the following procedure, remove
the top cover.
1. Remove the two screws "A" from the heat sinkbetween
the power IC.
2. Remove the solder fixing the power IC.
For MX-K10 Fig.2
wA
For MX-K30 Fig.3
WA

1-7
Replacing the he at sink cover
1. Remove the six screws "B" from the back panel.
2. Pull the heat sink cover outward.
Removing the top cover and two sides BOARD
(See Fig.5 and 6)
1. Remove the six screws "C" that retain the top cover from the
rear of the body.
2. Remove the eight screws "C" and "D" that retain the top from
the two sides of the body.
3. Remove the top cover from the body by lifting it toward the
rear.

1-8
Removing the CD changer unit
(See Fig.7 to 10)
 Prior to performing the following procedures, remove
the top cover and both sides BOARD.
[Caution] Althoughthe CD mechanismunitcan be
removed without removing the CD tray
panel, it is still recommended to remove it
in order to prevent damage.
a. From the front panel side of this set, push in the sec-
tions marked with arrows and pull out the CDtray
toward the front.
b. Remove the CDtray panel by pushing both of its ex-
tremities upward in the direction of the arrows.
c. Push the CD tray deep into the set.
1. Disconnect the card wires from the CDPCB CN703
and CN203.
2. From the rear of the set, remove the two screws "E"
and two serews "G" on the front panel left and right
side.
3. Handle the CDchanger unit rear, take out unit.

1-9
Removing the front panel assembly
(See Fig.11 and 12)
  Prior to performing the following procedures, remove
the top cover and both sides board.
  Also remove the CDchanger unit.
1. Disconnect the parallel wire and card wire from the
connectors CN702, CN701, CN101, CN850 on the
power amp and supply PCB.
2. Remove the two screws "H" retaining the front panel
assembly onto the bottom of the body.
3. Remove the screw "I" retaining the cassette deck
mechanism and then remove then GND lug "b" that
comes from the power amp and supply PCB.
4. Disengage the claws "c" on both sides at the bottom
of the front panel assembly and then remove the
assembly.

1-10
<Disassembly of units and assembly inside
this set>
Removing the CD PCB
(See Fig.13 and 14)
  Prior to performing the following procedures, remove
the top cover and both sides board.
  Also remove the CDchanger unit.
1. Disconnect the wires from CN603A, CN603B and
CN604 on the CDPCB, which is located on the back
side of the CDchanger unit.
2. The two screws "J" that retain the CD PCB should
be removed.
3. Remove the CD PCB by pulling it toward the side
where the CN601 is located.
4. Using solder, short the CD pickup to connect to short
round.
[Caution] Afterre-connectingthe wires,be sure to
remove the shorting solder from theGND
connection.
5. Disconnect the card wire from the connector CN601
on the main PCB and then remove the main PCB.

1-11
Removing the CD changer mechanism
assembly
(See Fig.15 to 17)
  Prior to performing the following procedures, remove
the top cover and both sides board.
  Also remove the CD changer unit.
1. Remove the screws "d" from the front chuch base of
the CD changer mechanism unit.
2. Turn the CD changer mechanism cover base and re-
move the screws "e" connecting the unit to the CD
changer mechanism assembly.
3. Removing the four screws "k" retaining the CD mecha-
nism holder assembly.
[Caution] When replacing the CD changer mechanism
assembly, be sure not to mistake the posi-
tions of the silver color and copper color
spring.

1-12
Removing the CD pickup (See Fig.18)
  Prior to performing the following procedures, re-
move the top cover and both sides board.
  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.
Replacing the loading motor and rotor belt
of the CD changer (See Fig .19)
  Prior to performing the following procedure, re-
move 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.
Replacing the CD turn table and remov-
ing the motor (See Fig. 20 and 21)
  Prior to performing the following procedures, re-
move the top cover.
  Also remove the CD changer unit.
1. Remove the one screws "N" retaining the CD (Turn
table).
2. Remove the two screws "O" retaining the stop-
per 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 (u/~ ward) to remove.
5. Remove the gear and after push out the tray motor
locker and pull out the tray motor from the CD
tray.

1-13
Removing the cassette deck mechanism
(See Fig.22)
  Prior to performing the following procedure, remove
the top cover and both sides board.
  Also remove the CD changer unit.
  Also remove the front panel assembly.
1. Remove the five screws "Z" retaining the cassette deck
mechanism.
Removing the earphone jack PCB
And Mic Jack PCB
(See Fig.23)
  Prior to performing the following procedure, remove
the top cover and both sides board.
  Also remove the CD changer unit.
  Also remove the front panel assembly.
1. Remove the screw with the washer, "P" that retains
the earphone jack PCB.
Removing the control/FL PCB
(See Fig.24)
  Prior to performing the following procedure, remove
the top cover and both sides board. Also remove the
CD changer unit.
  Also remove the CD changer unit.
  Also remove the CD changer unit.
1. Remove the four screws "Q" that retain the control/FL
PCB from the back of the front panel unit.

1-14
Removing the switch PCB and sound
mode and CD function switch PCB
(See Fig.24 to 27)
  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. Pull out the volume control knob and MIC Volume
Knob from the front of the front panel assembly.
2. Remove the four screws "Q" retaining the front panel
assembly.
3. Remove the control / FL PCB.
4. Remove the eleven screws "R" retaining the switch
(key 1) PCB.
5. Remove the three screws "S" retaining the sound mode
(key 2) switch PCB.
6. Remove two screws "T" retaining the CD function (key
3) switch PCB.

1-15
Removing the cassette deck main motor,
and replacing the main belts
(See Fig. 22, 28 and 29)
  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 five screws "z" retaining the cassette deck
mechanism.
2. Remove the cassette deck mechanism.
3. Remove the 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.
Removing the leaf switches of the cas-
sette deck mechanism
(See Fig. 22 and 30)
  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 five screws "O" that retain the cassette
deck mechanism.
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.

1-16
Removing the cassette deck heads
(See Fig. 22 and 31)
  Prior to performing the following procedures, remove
the top cover and both side board.
  Also remove the CD changer unit.
  Also remove the front panel assembly.
1. Remove the five screws "O" that retain the cassette
deck mechanism.
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
terminal and disconnect the wire.
4. Remove the screw "U" that retains the head.
5. Remove the screw "V" that retains the head.
6. Hold the head and slide it in the direction of the arrow
to remove it.
Removing the 3-pin regulator
(See Q904, Q907, 32 and 33)
  Prior to performing the following procedures, remove
the top cover and both sides board.
1. Remove the two screws "A" that connect the heat
sink cover to the rear panel.
2. Pull the heat sink outward.
3. Remove the screw "W" that retains the heat sink the
3-pin terminal regulator Q904,Q907.
4. Remove the solder fixing the 3-pin regulator.
wA
For MX-K30 Fig.32
A
W
For MX-K10 Fig. 33

1-17
Removing the power amp and supply
PCB and the power trans PCB
(See Fig. 2, 3, 32, 34 to 37)
  Prior to performing the following procedures, remove
the top cover and both sides board.
  Also remove heat sink cover.(Fig.4)
1. Remove the two screws "A" connecting the heat sink
cover to the rear panel.(Fig.2, 3)
2. Pull out the heat sink cover toward you.
3. Remove the three (CA-MXK10)/ four(CA-MXK30)screws
"AA" form the (CA-MXK10) chassis /MX-K30 back panel
between the heat sink.
4. Remove the three screws "X" that retain the speaker
terminals and AUX terminal.
5. Remove the screw "YY" and "Y" that retains the rear
panel, and AC switch screw then remove the rear panel.
6. Disconnect the parallel wires from the connectors
FW951 on the power trans PCB.
7. Remove the screw "Z" that retain the power amp and
supply PCB and then remove the assembly.
8. Remove the clamp of AC power cord from the chassis.
9. Remove the four screws "AB" that retain the power
trans PCB and then remove the assembly.
Fig.36

1-18
Adjustment method
Measurement instruments required
for adjustment
1. Low frequency oscillator,
This oscillator should have a capacity to output 0dB
to 600ohm at an oscillation frequency of 50Hz-
20kHz.
2. Attenuator impedance : 600ohm
3. Electronic voltmeter
4. Frequency counter
5. Wow flutter meter
6. Test tape
VT712 : For Tape speed and wow flutter ( 3kHz)
VT703 : For Head angle(10kHz),Play back frequency
characteristics(1kHz), and dubbing fre-
quency characteristics (63,1,10kHz)
7. Blank tape
TAPE I : AC-225
8. Torque gauge : For play and back tension forward ;
TW2111A, Reverse ; TW2121A Fast Forward and
Rewind ; TW2231A
9. Test disc: CTS-1000(12cm),GRG-1211(8cm)
10. Jitter meter
Measurement conditions
(Select correct AC LineVolt.)
Power supply voltage
AC110/127/220/230-240V (50/60Hz) US/UX
Measurement
output terminal : Speaker out
: TP101(Measuring for TUNER/
DECK/CD)
: Dummy load 6ohm
Radio input signal
AM modulation frequency : 400Hz
Modulation factor : 30%
FM modulation frequency : 400Hz
Frequency displacement : 22.5kHz
Frequency Range
AM 531kHz~1710kHz
FM 87.5MHz~108MHz
Standard measurement positions of
volume and switch
Power: Standby (Light STANDBY Indicator)
S, A, BASS : OFF
Sound mode : OFF
Main VOL. : 0 Minimum
Travers mecha set position : Disc 1
Mic MIX VOL : MAX
ECHO : OFF
Precautions f or measure ment
1. Apply 30pF and 33kohm to the IF sweeper output
side and 0.082

1-19

Arrangement of adjusting positions
Tape recorder section
Note: The adjustment of CD section is not required.
Tuner section
Items Measur ement
condi tions Measurement method Standar d
values
Adju stin g
posi tions
Cassette Head
Azimuth Alignments
Test tape :
VT703 (10kHz)
Measurement
output terminal :
Left and Right
speaker output
(6-ohm loaded)
or Headphone
Output
(32-ohm loaded)
1. Playback the test tape VT703 (10KHz) or equivalent.
2. Adjust the head azimuth screw to obtain maximum
output and both output of L / R is in 3dB.
3. Put on the screw lock paint after alignments.
Maximum output Adjust the
head azimuth
screw only
when the head
has been
changed.
Recording Bias
Frequency Alignment
Test tape :
TYPE IAC-225
Measurement
output terminal :
Erase head
terminal
(CN308 8-Pin)
1. Insert the recording tape in deck-B.
2. Starting the recording.
3. Adjust the oscillation frequency to 80KHz+/-3KHz
by core of Oscillation coil of L301.
80kHz+/-3kHz Use the High-
Impedance
Probe or
Frequency
counter input.
Items Measu rement
condi tions Measurement method Standard values
Ad justin g
p o sit io n s
AM Tracking
Alignments
Input signal:
530kHz (529kHz)
600kHz (603kHz)
Adjustment
point: Antenna
coil (L2)
1. Set the Signal Generator signal to 530KHz (529KHz)
the feed to Loop Antenna.
2. Receiving the signal and the adjust the OSC coil (L2)
obtain the V.T is 1.40V +/-0.05V.
3. Change the receiving frequency to 600KHz (603KHz).
4. Adjust the Antenna coil ( L2 ) obtain maximum
sensitivity .(Adjust the SSG output to out of AGC
range.)
V.T :
1.40V+/-0.05V
Maximum
sensitivity
Adjust the OSC
coil only when
the AM coil
block has been
changed.
AM IFT
Alignments
Input signal:
530kHz (529kHz)
Adjustment
point: IFT (T1)
1. Set the receiving frequency to 530KHz (529KHz ).
2. Feed the 450KHz signal to AM antenna input.
3. Adjust the IFT Block T1 obtain to maximum
output.(Adjust the SSG output to out of AGC
range.)
Maximum output Adjust the IFT
only when the
IFT b lock has
been changed.

1-20
Check Point
Confirm that the voltage at the pin5
of CN602 is "H"\"L"\"H".
Flow of functional operation until TOC read
Check that the voltage at the pin40
of IC601 is + 5V?
Confirm that the Focus error S-cuve
signal at the pin32 of IC601 is
approx.2Vp-p
Confirm that the signal from pin24
IC601 is 0V as a accelerated pulse
during approx.400ms.
Confirm the waveform of the Track-
ing error signal. at the pin 20 of IC611
(R643) (See fig-1)
Confirm the eys-pattern at the lead
of Tp3
Slider turns REST
SW ON.
Automatic tuning
of TE offset
Laser ON
Detection of disc
Automatic tuning of
Focus offset
Automatic measurement of
Focus S-curve amplitude
Power ON Play Key
Disc is rotated
Focus servo ON
(Tracking servo ON)
Automatic measurement of
Tracking error amplitude
Automatic tuning of
Tracking error balance
Automatic tuning of
Focus error balance
Automatic tuning of
Focus error gain
Automatic tuning of
Tracking error gain
TOC reading
Play a disc
 Tracking error waveform at TOC reading
Approx
1.8V
VREF
pin 20 of
IC611(TE)
Approx.3sec
Disc states
to rotate
Tracking
servo
off states
Tracking
servo
on states
Disc to be
braked to
stop
TOC reading
finishes
Automatic measurement
of TE amplitude and
automatic tuning of
TE balance
500mv/div
2ms/div Fig.1