JVC MX-K30R User manual

Flow of functional
operation until TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
Safety precautions
Important for laser products
Preventin static electricity
Disassembly method
Adjustment method
Contents
1- 2
1- 3
1- 4
1- 5
1-19
1-21
1-22
1-22
1-23
No.21138
Dec.2002
MX-K10R/K30R/K15R
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MX-K10R/K30R/K15R
COPYRIGHT © 2002VICTOR COMPANY OF JAPAN, LTD.
Are Suffix
E .................. Continetal Europe
EN ................. Northern Europe
B .................. U.K.
EV ................. E. Europe/Russia
CD-R/RWPLAYBACK
3-CD
PLAY& EXCHANGE
ACTIVE
BASSEX.
EJECT EJECT
REC / PLAY
B
CD SYNCHRO R ECORDING
PLAY
A
FULL - LOGI C CONT ROL
AUX CD TAPE
FM
/ A M
CD
3
CD
2
CD
1
COMPACT COMPONENT SYSTEM
MX-K30R
1BIT DUAL D/A
CONVERTER
PROGRAM
SOUND
MODE
REPEAT
PANDOM
PRESET
TUNING
ST
CANCEL
PHONES
RECSTART
/STOP CD REC START DUBBING
SET
ANDBY/ON ECO
STANDBY
/DEMO
V
O
L
U
M
E
DISCSKIP
R
O
C
K
I
C
L
A
S
S
C
P
O
P
CLOCK
/TIMER TAPE A / B
SELECT PTY / EON DISPLAYMODE
FMMODE
FM /AM
AUX
SLEEP
STANDBY/ON
CD 1 CD 2 CD 3
SOUND
SELECT PTY/EON MODE
DISPLAY
MODE
ACTIVE
BASS EX. FADE
MUTING
VOLUME
PROGRAM
/RANDOM
REPEAT
TAPE
A/B
TAPE
CD
BASS-REFLEX BASS-REFLEX
CD-R/RWPLAYBACK
3-CD
PLAY& EXCHANGE
ACTIVE
BASS EX.
EJECT EJECT
REC / PLAY
B
CDSYNCHRO RECORDING
PLAY
A
FULL -L OGI C C ONT ROL
AUX CD TAPE
FM
/ A M
CD
3
CD
2
CD
1
COMPACT COMPONENT SYSTEM
MX-K15R
1BIT DUAL D/A
CONVERTER
PROGRAM
SOUND
MODE
REPEAT
PANDOM
PRESET
TUNING
ST
CANCEL
PHONES
RECSTART
/STOP CD REC START DUBBING
SET
ANDBY/ON ECO
STANDBY
/DEMO
V
O
L
U
M
E
DISCSKIP
R
O
C
K
I
C
L
A
S
S
C
P
O
P
CLOCK
/TIMER TAPE A / B
SELECT PTY / EON DISPLAYMODE
FMMODE FM /AM
AUX
SLEEP
STANDBY/ON
CD 1 CD 2 CD 3
SOUND
SELECT PTY/EON MODE
DISPLAY
MODE
ACTIVE
BASSEX. FADE
MUTING
VOLUME
PROGRAM
/RANDOM
REPEAT
TAPE
A/B
TAPE
CD
BASS-REFLEX BASS-REFLEX
CD-R/RWPLAYBACK
3-CD
PLAY& EXCHANGE
ACTIVE
BASSEX.
EJECT EJECT
REC/ PLAY
B
CDSYNCHRO RECORDING
PLAY
A
FULL - LOGI C CONT ROL
AUX CD TAPE
FM
/ A M
CD
3
CD
2
CD
1
COMPACT COMPONENT SYSTEM
MX-K10R
1BIT DUAL D/A
CONVERTER
PROGRAM
SOUND
MODE
REPEAT
PANDOM
PRESET
TUNING
ST
CANCEL
PHONES
RECSTART
/STOP CD REC START DUBBING
SET
ANDBY/ON ECO
STANDBY
/DEMO
V
O
L
U
M
E
DISCSKIP
R
O
C
K
I
C
L
A
S
S
C
P
O
P
CLOCK
/TIMER TAPE A / B
SELECT PTY / EON DISPLAYMODE
FMMODE FM /AM
AUX
SLEEP
STANDBY/ON
CD 1 CD 2 CD 3
SOUND
SELECT PTY/EON MODE
DISPLAY
MODE
ACTIVE
BASSEX. FADE
MUTING
VOLUME
PROGRAM
/RANDOM
REPEAT
TAPE
A/B
TAPE
CD
SP-MXK10 CA-MXK10R SP-MXK10 SP-MXK15 CA-MXK15R SP-MXK15
SP-MXK30 CA-MXK30R SP-MXK30
MX-K30R
MX-K10R
E .................. Continetal Europe
EN ................. Northern Europe
EV ................. E. Europe/Russia
MX-K15R
EV ................. E. Europe/Russia

1-2
Safety Precautions
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.Thisequipment hasbeendesignedandmanufacturedtomeetinternationalsafetystandards.
2.It isthe legalresponsibility ofthe repairerto ensure thatthese safetystandards aremaintained.
3.Repairs must bemade in accordance withthe relevantsafety standards.
4.It is essential that safety critical components are replacedby approved parts.
5.If mainsvoltage selector is provided, check settingfor localvoltage.
!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.
l 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 0.5mAAC (r.m.s.)
l 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 following manner. Con-
nect a 1,500 10W resistor paralleled by a 0.15
F
AC-type capacitor between an exposed 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 meausre
the AC voltage across the resistor. Now, reverse
the plug in the AC outlet andrepeat 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.).
!
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.

1-3
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 ANDPOSITIONOFLABELS
WARNING LABEL
! CAUTION Please use enough caution not
to see the beam directly or touch
it in case of an adjustment or
operation check.
VARNING : Osynlig laserstrålning är denna del är
öppnad och spårren är urkopplad. Betrakta
ej strålen.
VARO : Avattaessa ja suojalukitus ohitettaessa olet
alttiina näkymättömälle lasersäteilylle. Älä
katso säteeseen.
ADVARSEL : Usynlig laserstråling ved åbning, når
sikkerhedsafbrydere er ude af funktion.
Undgå udsættelse for stråling.
ADVARSEL : Usynlig laserstråling ved åpning, når
sikkerhetsbryteren er avslott. Unngå
utsettelse for stråling.

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.
Remove 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 "Disassembly method" in the text for 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
nTop cover
nCD changer unit
nFront panel assembly
nChassis unit
nCD changer unit
nRemoving the main PCB
nRemoving the CD changer mechanism assembly
nRemoving the CD pickup
nReplacing the loading motor and belt of the CD changer tray
nReplacing the CD tray rotor belt of CD changer, and removing the motor
nFront panel assembly
nRemoving the cassette deck mechanism
nRemoving the earphone jack PCB
nRemoving the control/FL PCB
nRemoving the switch PCB and ACTIVE BASS EX. switch PCB
nRemoving the cassette deck main motor, and replacing the main belts
nRemoving the leaf switches of the cassette deck mechanism
nRemoving the cassette deck heads
nChassis unit
nRemoving the 3-pin regulator
nRemoving the power amp and supply PCB and the Power Trans PCB
nRemoving the sub power PCB

1-6
<Disassemblyofthe mainblocksof thisset>
Replacement of the fuses and the power IC
nReplacing the fuses (See Fig.1, Fig.4)
n Prior to performing the following procedure, remove
the left side BOARDand remove tuner PCB (Fig.4,BB)
1. Replace the fuses inside.
[Caution] Besure touse fuseswiththe specifiedratings.
nReplacing the power IC (See Fig.2 to 3)
n 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.
Fuse (F952)
T1.6AL250V FW981 Fuse(F981)
T1AL 250V CN981
For CA-MXK10R/15R Fig.1(A)
ComponentSIDE
Fuse(F952)
T1.6AL 250V Fuse (F981)
T2AL 250V CN981
For CA-MXK30R Fig.1(B)
ComponentSIDE
WA
For CA-MXK10R/15R Fig.2
wA
For CA-MXK30R Fig.3
CN981 CAUTION
(don’t remove
thesafetysheet
cover )
Fuse(F981)
T1AL 250V Fuse(F952)
T1.6AL 250V
For CA-MXK10R/15R Fig.1(A)
BOTTOMSIDE
FW981
CN981 CAUTION
(don’t remove
thesafetysheet
cover )
Fuse(F952)
Fuse Hole
HOLE
FW951
For CA-MXK30R Fig.1(B)
BOTTOMSIDE
Fuse (F981)
T2AL 250V

1-7
nReplacing the heat sink cover
1. Remove the six screws "B" from the back panel.
2. Pull the heat sink cover outward.
nRemoving 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.
BB
B
For CA-MXK30R Fig.4
For CA-MXK10R/K30R Fig.6(A)
For CA-MXK15R Fig.5(B)
For CA-MXK10R/K30R Fig.5(A)

1-8
nRemoving the CD changer unit
(See Fig.7 to 10)
n Prior to performing the following procedures, remove
the top cover and both sides BOARD.
[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.
a. From the front panel side of this set, push in the sec-
tions marked with arrows and pull out the CD tray
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 CD PCB 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.
For CA-MXK15R Fig.6(B)

1-9
For CA-MXK10R/30R Fig.9(A)
For CA-MXK15R Fig.9(B)

1-10
nRemoving the front panel assembly
(See Fig.11 and 12)
n Prior to performing the following procedures, remove
the top cover and both sides board.
n Also remove the CDchanger unit.
1. Disconnect the parallel wire and card wire from the
connectors CN702,CN701,CN101on 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 GNDlug "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.

1-11
<Disassembly of units and assembly inside
this set>
nRemoving the CD PCB
(See Fig.13 and 14)
n Prior to performing the following procedures, remove
the top cover and both sides board.
n 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
beremoved.
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] After re-connecting the 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.

1-12
nRemoving the CD changer mechanism
assembly
(See Fig.15 to 17)
n Prior to performing the following procedures, remove
the top cover and both sides board.
n Also remove the CDchanger unit.
1. Remove the screws "d" from the front chuch base of
the CDchanger mechanism unit.
2. Turn the CD changer mechanism cover base and
remove the screws "e" connecting the unit to the CD
changer mechanism assembly.
3. Removing the four screws "k" retaining the CD
mechanism holder assembly.
[Caution] When replacing the CDchanger mechanism
assembly, be sure not to mistake the
positions of the silver color and copper color
spring.

1-13
nRemoving the CD pickup (See Fig.18)
n Prior to performing the following procedures, re-
move the top cover and both sides board.
n Also remove the CD changer unit.
n 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 CDpickup.
nReplacing the loading motor and rotor belt
of the CD changer (See Fig .19)
n Prior to performing the following procedure, re-
move the top cover.
n 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.
nReplacing the CD turn table and remov-
ing the motor (See Fig. 20 and 21)
n Prior to performing the following procedures, re-
move the top cover.
n Also remove the CD changer unit.
1.Removethe one screws "N" retainingthe CD (Turn
table).
2. Remove the two screws "O" retaining the stop-
per brackets on both sides of the CDchanger 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.

1-14
nRemoving the cassette deck mechanism
(See Fig.22)
n Prior to performing the following procedure, remove
the top cover and both sides board.
n Also remove the CDchanger unit.
n Also remove the front panel assembly.
1.Remove thefivescrews "Z"retaining thecassettedeck
mechanism.
nRemoving the earphone jack PCB
(See Fig.23)
n Prior to performing the following procedure, remove
the top cover and both sides board.
n Also remove the CDchanger unit.
n Also remove the front panel assembly.
1. Remove the screw with the washer, "P" that retains
the earphone jack PCB.
nRemoving the control/FL PCB
(See Fig.24)
n Prior to performing the following procedure, remove
the top cover and both sides board.Also remove the
CDchanger unit.
n Also remove the CDchanger unit.
n Also remove the CDchanger unit.
1. Remove the four screws "Q" that retain the control/FL
PCB from the back of the front panel unit.

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 CDchanger unit.
  Also remove the front panel assembly.
1. Pull out the volume control 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.Removethethreescrews"S"retainingthesoundmode
(key 2) switch PCB.
6. Remove two screws "T" retaining the CD function (key
3) switch PCB.
1-15

1-16
nRemoving the cassette deck main motor,
and replacing the main belts
(See Fig. 22, 28 and 29)
n Prior to performing the following procedures, remove
the top cover and both sides board.
n Also remove the CDchanger unit.
n Also remove the front panel assembly.
1.Remove the fivescrews "z" retainingthe cassettedeck
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
beltsare different.Whenattachingthemain
belts, use the longer belt for cassette A.
nRemoving the leaf switches of the cas-
sette deck mechanism
(See Fig. 22 and 30)
n Prior to performing the following procedures, remove
the top cover and both sides board.
n Also remove the CDchanger unit.
n 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.

1-17
nRemoving the cassette deck heads
(See Fig. 22 and 31)
n Prior to performing the following procedures, remove
the top cover and both side board.
n Also remove the CDchanger unit.
n 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.
nRemoving the 3-pin regulator
(See Q904, Q907, 32 and 33)
n 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 CA-MX K30R Fig.32
A
W
For CA-MX K10R/K15R Fig. 33

1-18
nRemoving the power amp and supply
PCB and the power trans PCB
(See Fig. 2, 3, 32, 34 to 37)
n Prior to performing the following procedures, remove
the top cover and both sides board.
n 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.Removethethree(CA-MXK10/K15R)/four(CA-MXK30)
screws "AA" form the (CA-MXK10/K15R) 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" that retains the rear panel,
and then remove the rear panel.
6. Disconnect the parallel wires from the connectors
FW951 and CN981 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 ofAC power cord from the chassis.
9. Remove the four screws "AB" that retain the power
trans PCB and then remove the assembly.
YY
BB
X
CLAMP
For CA-MXK10R/K15R Fig.34(A)
For CA-MXK30R Fig.37(B)
Fuse F981
T2AL 250V AB FW 951
Fuse F952
T1.6AL 250V
AB
For CA-MXK10R/K15R Fig.37 (A)
X
Y
YY
CLAMP
For CA-MXK30R Fig.34(B)
Fuse(F952)
T1.6AL 250V Fuse (F981)
T2AL 250V CN981
For CA-MXK30R Fig.35(B)
ComponentSIDE
Fuse (F952)
T1.6AL 250V FW981 Fuse(F981)
T1AL 250V CN981
For CA-MXK10R/K15R Fig.35 (A)
ComponentSIDE
Fig.36
For CA-MXK10R/K15R Fig.34(A)

1-19
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
frequency 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
Power supply voltage
AC230V (50Hz)
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 : 1kHz
Frequency displacement : 22.5kHz
Frequency Range
FM 87.5MHz~108MHz
MW 522kHz~1629kHz
LW 144kHz~228kHz
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
Precautions for measurement
1. Apply 30pF and 33kohm to the IF sweeper output
side and 0.082
F and 100kohm in series to the
sweeper input side.
2. The IF sweeper output level should be made as low as
possible within the adjustable range.
3. Since the IF sweeper is a fixed device, there is no
need to adjust this sweeper.
4. Since a ceramic oscillator is used, there is no need to
perform any MPX adjustment.
5. Since a fixed coil is used, there is no need to adjust
the FM tracking.
6.The input and output earth systems are separated. In
case of simultaneously measuring the voltage in both
of the input and output systems with an electronic
voltmeter for two channels, therefore, the earth should
be connected particularly.
7. In the case of BTL connection amplifier, the minus
terminal of speaker is not for earthing. Therefore, be
sure not to connect any other earth terminal to this
terminal. This system is of an OTL system.

Arrangement of adjusting positions
Tape recorder section
Note: The adjustment of CD section is not required.
Tuner section
Items Measurement
condi tions Measurement method Standard
values Adjusting positions
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 Head azimuth
screw
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 Bias coil: L301
Use the High-
Impedance
Probe or
Frequency
counter input.
Items Measurement
condi tions Measurement method Standard values Adjusting positions
AM Tracking
Alignments Input signal : 529kHz(530kHz)
603kHz(600kHz)
Measurement
point :
Resistor(R3)
terminal
1. Set the Signal Generator signal to 529KHz (530KHz)
the feed to Loop Antenna.
2. Receiving the signal and the adjust the OSC coil
L4(MW)/L5(LW) obtain the V.T is 1.40V +/-0.05V.
3. Change the receiving frequencyto 603KHz(600KHz).
4. Adjust the Antenna coil L2(MW)/L3(LW) obtain
maximum sensitivity .(Adjust the SSG output to
out of AGC range.)
V.T :
1.40V+/-0.05V
Maximum
sensitivity
OSC coil:
L4(MW)/L5(LW)
Antenna coil:
L2(MW)/L3(LW)
Adjust the OSC
coil only when
the AM coil
block has been
changed.
AM IFT Alignments Input signal :
530kHz(529kHz) 1. Set the receiving frequency to 529KHz (530KHz ).
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 IFT(T1)
Adjust the IFT
only when the
IFT block has
been changed.
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