JVC MX-K30 User manual

SERVICE MANUAL
COMPACT COMPONENT SYSTEM
No.21084
Oct. 2002
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
MX-K30/MX-K10
MX-K30/MX-K10
Contents
Safety precautions
Important for laser products
Preventing static electricity
Disassembly method
Adjustment method
Flow of functional
operation until TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-2
1-3
1-4
1-5
1-18
1-20
1-21
1-21
1-22~28
Area Suffix
JU.S.A.
CCanada
BASS-REFLEX BASS-REFLEX
CD-R/RWPLAYBACK
3-CD
PLAY& EXCHANGE
ACTIVE
BASSEX.
CLOCK
/TIMER

 


 


 








TAPE
A / B
CD
3
CD
2
CD
1
COMPACT COMPONENT SYSTEM
MX-K10
1 BIT DUAL D/A
CONVERTER
PROGRAM
SOUND
MODE
REPEAT
PANDOM
PRESET
TUNING
STANDBY/ON
STANDBY CANCEL
PHONES
RECSTART
/STOP CD REC START DUBBING
SET
/DEMO
V
O
L
U
M
E
DISCSKIP
R
O
C
K
I
C
L
A
S
S
C
P
O
P
FMMODE
FM /AM
AUX
SLEEP
STANDBY/ON
CD 1 CD 2 CD 3
SOUND
MODE
ACTIVE
BASSEX. FADE
MUTING
VOLUME
PROGRAM
/RANDOM
REPEAT
TAPE
A/B
TAPE
CD
CA-MXK10SP-MXK10
CA-MXK30SP-MXK30 SP-MXK30
SP-MXK10
CD-R/RWPLAYBACK
3-CD
PLAY& EXCHANGE
ACTIVE
BASSEX.
CLOCK
/TIMER

 


 


 








TAPE
A / B
CD
3
CD
2
CD
1
COMPACT COMPONENT SYSTEM
MX-K30
1 BIT DUAL D/A
CONVERTER
PROGRAM
SOUND
MODE
REPEAT
PANDOM
PRESET
TUNING
STANDBY/ON
STANDBY CANCEL
PHONES
RECSTART
/STOP CD REC START DUBBING
SET
/DEMO
V
O
L
U
M
E
DISCSKIP
R
O
C
K
I
C
L
A
S
S
C
P
O
P
FMMODE
FM /AM
AUX
SLEEP
STANDBY/ON
CD 1 CD 2 CD 3
SOUND
MODE
ACTIVE
BASSEX. FADE
MUTING
VOLUME
PROGRAM
/RANDOM
REPEAT
TAPE
A/B
TAPE
CD
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1-2
Safety Precautions
1.This design of this product contains special hardware and many circuits and components specially
for safety purposes. For continued protection, no changes should be made to the original design
unless authorized in writing by the manufacturer. Replacement parts must be identical to those
used in the original circuits. Services should be performed by qualified personnel only.
2. Alterations of the design or circuitry of the product should not be made. Any design alterations of
the product should not be made. Any design alterations or additions will void the 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 following manner. Connect 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 eachexposed 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 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.).
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.
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
!
CAUTION
Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.
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1-3
Important for laser products
FUSE CAUTION
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
laserradiation and is equipped with safety switches
whichprevent emission of radiation when the drawer is
open and the safety interlocks have failed or are de
feated. 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 herein may result in
hazardous radiation exposure.
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.
!
CAUTION
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
TTENTI N :
FOR
WITH SAME TYPE REPLACE FUSE (S).
REMPLACER PAR UN (LES) FUSIBLE (S)
DE MEME TYPE.
CONTINUED PROTECTION
AGAINST FIRE HAZARD,
REPLACE ONLY WITH
SAME TYPE AND RATING
FUSE (S).
C UTI N :
C UTI N :
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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 adjusts the laser power.
Do not turn it
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
Attention when traverse unit is decomposed
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 CN601
on 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.
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the CD changer mechanism.
Soldering
Fig.2
Flexible cable
Fig.1
CD changer
unit
CD changer
mechanism
assembly
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1-5
Disassembly method
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
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
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1-6
Fig.1(B)For MX-K30
Fig.2For MX-K10
Fig.3For MX-K30
Fig.1(A)For MX-K10
[Caution] Be sure to use fuses with the specified
ratings.
Replacing the fuses (See Fig.1)
1.
Prior to performing the following procedure, remove
the left side BOARD
Replace the fuses inside.
1.
2.
Prior to performing the following procedure, remove
the top cover.
Remove the two screws "A" from the heat sink
Remove the solder fixing the power IC.
Replacing the power IC (See Fig.2 to 3)
<Disassembly of the main blocks of this set>
Replacement of the fuses and the power IC
1.Remove the six screws "B" from the back panel.
2.Pull the heat sink cover outward.
Replacing the heat sink cover
between the power IC.
Fuse (F951)
Fuse (F952)
1.6A 250V
FW 951
3.15A 250V
Fuse (F951)
1.6A 250V
FW 951
Fuse (F952)
1.6A 250V
W A
B
WA
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1-7
Fig.5
Removing the top cover and two sides BOARD
(See Fig.5 and 6)
1.
2.
3.
Remove the six screws "C" that retain the top cover
from the rear of the body.
Remove the eight screws "C" and "D" that retain the top
from the tw
o sides of the body.
Remove the top cover from the body by lifting it
toward the rear.
Fig.6
B
C
C
Top cover
Front panel assembly
Front panel assembly
D
D
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1-8
Fig.7
[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.
Prior to performing the following procedures,
remove the top coverand botn sides BOARD
a.
b.
c.
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 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 CD changer unit rear, take out unit.
Removing the CD changer unit
(See Fig.7 to 10)
Fig.9
Fig.10
Fig.8
CD tray panel
CD tray panel
CD changer
unit
Accessory
terminal Antenna
termianl
E
F
F
G
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1-9
Prior to performing the following procedures,
remove the top coverand both sides board.
Also remove the CD changer unit.
1.
2.
3.
4.
Disconnect the parallel wire and card wire from the
connectors CN702,CN701,CN101on the power amp
and supply PCB.
Remove the two screws "H" retaining the front
panel assembly onto the bottom of the body.
Remove the screw "I" retaining the cassette dec k
mechanism and then remove the GND lug "b" that
comes from the power amp and supply PCB.
Disengage the claws "c" on both sides at the
bottom of the front panel assembly and then
remove the assembly.
Removing the front panel assembly
(See Fig.11 and 12)
Fig.11
H
Fig.12
I
Power amp and
supply PCB
Claw c
GND lug b
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1-10
Fig.13
Prior to performing the following procedures,
remove the top coverand both sides board.
Also remove the CD changer unit.
1.
2.
3.
4.
5.
Disconnect the wires from CN603A, CN603B and
CN604 on the CD PCB, which is located on the
back side of the CD changer unit.
The two screws"J" that retain the CD PCB should
be removed.
Remove the CD PCB b y pulling it toward the side
where the CN601 is located.
Using solder, short the CD pickup to connect to
short round.
Disconnect the card wire from the connector
CN601 on the main PCB and then remove the
main PCB.
Removing the CD PCB
(See Fig.13 and 14)
Fig.14
<Disassembly of units and assembly
inside this set>
[Caution] After re-connecting the wires, be sure to
remove the shorting solder from the GND
connection.
CD PCB
Short round
CN601
J
CD PCB
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1-11
Fig.15
Prior to performing the following procedures,
remove the top coverand both sides board.
Also remove the CD changer unit.
1.
2.
Remove the screws"d" from the front chuch base
of the CD changer mechanism unit.
Turn the CD changer mechanism cover base
and remove the screws "e" connecting the unit to
the CD changer mechanism assembly.
3.Remove the four screws "k" retaining the CD
mechanism holder assembly.
Removing the CD changer mechanism
assembly (See Fig.15 to 17)
[Caution] When replacing the CD changer
mechanism assembly, be sure not to
mistake the positions of the silver color
and copper color spring ..
Fig.17 Fig.16
e
CD changer
mechanism
assembly
K ( Silver color) K ( copper color)
K ( Silver color) K ( copper color)
d
CD changer
unit
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1-12
Fig.18
Fig.19
Fig.20
Fig.21
Motor locker
Turn table motor
Obligue gear
Prior to performing the following procedures,
remove the top cover and both sides board.
Also remove the CD changer unit.
Also remove the CD changer mechanism
1.
2.Widen the section "f ". 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.
Removing the CD pickup (See Fig.18)
Prior to performing the following procedure,
remove the top cover.
1.
2.
Remove the two screws "L" retaining the CD
changer tray loading motor.
Remove the two screws "M' retaining the gear plate
and take it out, after remove the rotor belt from the
pulley.
Replacing the loading motor and rotor
blet of the CD changer (See Fig .19)
Prior to performing the following procedures,
remove 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 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 (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.
, and then remove the CD tray
.
Replacing the CD turn table and removing
the motor (See Fig. 20 and 21)
Also open the CD changer tray.
g
M
L
f
CD pickup
Shaft
d
N O
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1-13
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 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 screw with the washer, "P" that retains
the earphone jack PCB.
Removing the earphone 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 CD changer unit.
Also remove the CD changer unit.
1.Remove the three screws "Q" that retain the
control/FL PCB from the back of the front panel
unit.
Removing the control/FL PCB
(See Fig.24)
Fig.22
Fig.23
Z
Z
Front panel
assembly
P
Front panel
assembly
Earphone jack
PCB
Front panel
assembly
Q
Control/FL
PCB
Fig.24
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1-14
Fig.25
Prior to performing the following procedures,
remove the top coverand both sides board.
Also remove the CD changer unit.
Also remove the front panel assembly.
1.
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.
Pull out the volume control knob from the front of
the front panel assembly.
Removing the switch PCB and sound mode
and CD function switch PCB
(See Fig.24 to 27)
Fig.26
Front panel
assembly
Volume shaft
Volume knob
Front panel assembly
Fig.27
Key 1 PCB
R
S
T
R
Key 2 PCB Key 3 PCB
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1-15
Fig.28
Fig.29
Prior to performing the following procedures,
remove the top coverand both sides board.
Also remove the CD changer unit.
Also remove the front panel assembly.
1.
2.
3.
4.
Remove the five screws "z" retaining the cassette
deck mechanism.
Remove the cassette deck mechanism.
Remove the two screws "t" retaining the main
motor from the front side of the cassette deck.
From the backside of the cassette deck, remove
the main motor and two main belts.
Removing the cassette deck main
motor, and replacing the main belts
(See Fig.22, 28 and 29)
Fig.30
[Caution]
[Caution]
After attaching the main motor, check the
orientation of the motor and the polarity of
the wires.
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.
Prior to performing the following procedures,
remove the top coverand both sides board
Also remove the CD changer unit.
Also remove the front panel assembly.
1.
2.
3.
4.
5.
Remove the five screws "O" that retain the cassette
deck mechanism.
Remove the cassette deck mechanism.
Turn the cassette deck mechanism upside down.
Remove the solder from around the leaf switches.
Pull out the leaf switches from the front side of the
cassette deck mechanism.
Removing the leaf switches of the
cassette deck mechanism
(See Fig.22 and 30)
Cassette deck mechanism
(Back side)
Solder side of leaf switch
t
Cassette deck mechanism
(Front side)
Cassette deck mechanism
(Back side) Cassette deck main motor
Main belt
(For A cassette)
Main belt
(For B cassette)
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1-16
Fig.31
Prior to performing the following procedures,
remove the top coverand both sides board.
Also remove the CD changer unit.
Also remove the front panel assembly.
1.
2.
3.
4.
5.
6.
Remove the five screws "O" that retain the cassette
deck mechanism.
Remove the cassette deck mechanism and place it
so that the front side faces up.
Remove the solder from the bottom side of the
head terminal and disconnect the wire.
Remove the screw "U" that retains the head.
Remove the screw "V" that retains the head.
Hold the head and slide it in the direction of the
arrow to remove it.
Removing the cassette deck heads
(See Fig.22 and 31)
For MX-K30 Fig.32
For MX-K10 Fig.33
AW
AW
Prior to performing the following procedures,
remove the top coverand both sides board.
1.
2.
3.
4.
Remove the two screws "A" that connect the heat
sink cover to the rear panel.
Pull the heat sink outward.
Remove the screw "W" that retains the heat sink
the 3-pin terminal regulator.Q904, Q907
Remove the solder fixing the 3-pin regulator.
Removing the 3-pin regulator Q904, Q907
(See Fig.32 and 33)
Cassette deck mechanism
(Front side)
VU
PB Head REC/PB Head
VU
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1-17
For MX-K10 Fig.34 (A)
For MX-K10 Fig.34 (B)
X
YY
Clamp
AA
Prior to performing the following procedures,
remo
Also remove heat sink cover.(Fig. 4)
ve the top cover and both sides board.
1.
2.
3.
4.
5.
6.
7.
8.
Remove the two screws "A" connecting the heat
sink cover to the rear panel.(Fig. 2.3)
Pull out the heat sink co
3.Remove teh three (MX-K10)/ four(MX-K30)screws
"AA" form the (MX-K10) chassis /MX-K30 back panel
between the heat sink.
ver toward you.
Remove the two screws "X" that retain the
speaker terminals and AUX terminal.
Remove the screw "YY" that retains the rear panel,
and then remove the rear panel.
Disconnect the parallel wires from the connectors
FW951 on the power trans PCB.
Remove the screw "Z" that retain the power amp
and supply PCB and then remove the assembly.
Remove the clamp of AC power cord from the
chassis.
Remove the four screws "AB" that retain the
power trans PCB and then remove the assembly.
Removing the power amp and supply
PCB and the power trans PCB
(See Fig.2, 3, 32,34 to 37)
Fig.36
Rear panel
Chassis Z
Power amp and
supply PCB
Clamp
Clamp
For MX-K30 Fig.34 (B)
For MX-K30 Fig.37 (B)For MX-K10 Fig.37 (A)
For MX-K10 Fig.35 (A) For MX-K30 Fig.35 (B)
FW951
FW951
x
Y
FUSE 952
1.6A 250V FUSE 952
1.6A 250V
FUSE 951
1.6A 250V FUSE 951
3.15A 250V
AB
AB
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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)
7. Blank tape
TAPE : AC-225, TAPE : AC-514
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
AC120V (60Hz)
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 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.
VT703 : For Head azimuth(10kHz )
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1-19
Arrangement of adjusting positions
Items Measurement
conditions Measurement method Standard
values Adjusting positions
Tape recorder section
Tuner section
Cassette deck mechanism
(Front side)
Head azimuth screw
(Forward side)
PB Head
(Deck-A) REC/PB Head (Deck-B)
Main P.C.B.
TUNER P.C.B.
Head azimuth screw
(Reverse side) Head azimuth screw (Reverse side)
Head azimuth screw
(Forward side)
1.Playback the test tapeVT703 (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.
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.
Test tape
: VT703 (10kHz)
Measurement output
terminal
: Left and Right
speaker output
(6-ohm loaded)
or
Headphone Output
(32-ohm loaded)
Test tape
: TYPE AC-514
Measurement output
terminal
: Erase head terminal
(CN308 8-Pin)
Maximum output
80kHz+/-3kHz
Adjust the head
azimuth screw
only when the
head has been
changed.
Use the High-
Impedance Probe
for Frequency
counter input.
Cassette Head
Azimuth Alignments
Recording Bias
Frequency Alignment
Items Measurement
conditions Measurement method Standard
values Adjusting positions
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.)
1.Set the receiving frequency to 530KHz (529KHz )
2.Feed the 450KHz signal to AM antenna input.
3.Adjust the IFT BlockT1 obtain to maximum output.
(Adjust the SSG output to out of AGC range.)
Input signal
: 530kHz (529kHz)
600kHz (603kHz)
Adjustment point
: Antenna coil (L2)
Input signal
: 530kHz (529kHz)
Adjustment point
: IFT (T1)
V. T
: 1.40V+/-0.05V
Maximum
sensitivity
Maximum output
Adjust the OSC
coil only when the
AM coil block has
been changed.
Adjust the IFT
only when the IFT
block has been
changed.
AMTracking
Alignments
AM IFT Alignments
Note:The adjustment of CD section is not required.
L301L301 8-Pin
8-Pin
CN308
CN308
L2L2
T1T1
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1-20
Flow of functional operation until TOC read
Slider turns REST
SW ON.
Automatic tuning
of TE offset
Laser ON
Detection of disc
Automatic measurement of
Focus S-curve amplitude
Automatic tuning of
Focus offset
Disc is rotated
Focus servo ON
(Tracking servo ON)
Automatic tuning of
Tracking error balance
Automatic measurement of
Tracking error amplitude
Automatic tuning of
Focus error balance
Disc to be
braked to stop
Tracking
servo
on states
Tracking
servo
off states
Disc states
to rotate TOC reading
finishes
Automatic measurement
of TE amplitude and
automatic tuning of
TE balance 500mv/div
2ms/div Fig.1
Approx.3sec
pin 20 of
IC611(TE)
Approx
1.8V
VREF
Tracking error waveform at TOC reading
Power ON Play Key
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 Tracking error signal.
at the pin 20 of IC611 (R643)
(See fig-1)
Automatic tuning of
Focus error gain
Automatic tuning of
Tracking error gain
TOC reading
Play a disc
Confirm the eys-pattern
at the lead of TP3
Confirm that the voltage at the pin5
of CN602 is "H"\"L"\"H".
Check Point
Check that the voltage at the
pin40 of IC601 is + 5V?
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