JVC MX-GA3V User manual

MX-GA3V
Contents
Safety precautions ---------------------------- 1- 2
Important for laser products ----------------- 1- 3
Preventing static electricity ----------------- 1- 4
Disassembly method ------------------------ 1- 5
Adjustment method -------------------------- 1- 18
Flow of functional
operation until TOC read -------------- 1- 20
Maintenance of laser pickup -------------- 1- 21
Replacement of laser pickup -------------- 1- 21
Description of major ICs ------------------- 1- 22
SP-MXGA3V CA-MXGA3V SP-MXGA3V
Area Suffix
US ................... SINGAPORE
UX ....................... Saudi Araia
COPYRIGHT ©2003 VICTOR COMPANY OF JAPAN, LTD.
No. MB036
2003/11
MX-GA3V
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
Wiring connection ----------------------------- 1- 29

MX-GA3V
1-2
Warning
!
CAUTION
Good earth ground
Place this
probe on
each exposed
metal part.
A VOLTMETER
(Having 1000
ohms/v
1500 10W
olts,
or more sensitivity)
0.15 F A TYPE
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 A line cord directly into the A outlet. Using a "Leakage urrent 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 A (r.m.s.)

Alternate check method
Plug the A line cord directly into the A outlet. Use an A voltmeter having, 1,000 ohms per volt or
more sensitivity in the following manner. onnect a 1,500 10W resistor paralleled by a 0.15 F A -
type capacitor between an exposed metal part
and a known good earth ground. Measure the A
voltage across the resistor with the A 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 A voltage across the resistor. Now, reverse
the plug in the A outlet and repeat each
measurement. Voltage measured Any must not
exceed 0.75 V A (r.m.s.). This corresponds to 0.5
mA A (r.m.s.).
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.
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.

MX-GA3V
1-3
VIDEO OUT
110 V
127V
220V
230V
-240V
WARNIN LABEL
1. CLASS 1 LASER PRODUCT
2. CAUTION :
Visible and invisible laser radiation when
open and interlock 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.
Important for laser products
REPRODU TION AND POSITION OF LABELS
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.
!
CAUTION Please use enough caution not to
see the beam directly or touch it in
case of an adjustment or
operation check.
VARNIN : Osynlig laserstrålning är denna del är öppnad
och spårren är urkopplad. Betrakta ej strålen.
VAR O : 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.

MX-GA3V
1-4
Preventing static electricity
1. rounding 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 round 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 round 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 testers internal power
source can easily destroy the laser diode.
4. Handling the CD changer unit (optical pickup)
1. Do not subject the D changer unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
2. ut 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 D 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.
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 D changer unit.
2. Disconnect the harness from connector on the D motor
board.
3. Solder is put up before the card wire is removed from connector
n601on the main board as shown in Fig.1 and Fig.2.
(When the wire is removed without putting up solder, the
D pick-up assembly might destroy.)
4. Please remove solder after connecting the card wire with
N601 when you install picking up in the substrate.
onductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
Soldering
Fig.2
Flexible cable
Fig.1
D changer
unit
D changer
mechanism
assembly

MX-GA3V
1-5
Disassembly method
ommence disassembly of the 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
 D changer unit
 Front panel assembly
 hassis unit
 D changer unit
 Removing the main P B
 Removing the D changer mechanism assembly
 Removing the D pickup
 Replacing the loading motor and belt of the D changer tray
 Replacing the D tray rotor belt of D changer, and removing the motor
 Front panel assembly
 Removing the cassette deck mechanism
 Removing the earphone jack P B
 Removing the control/FL P B
 Removing the switch P B and A TIVE BASS EX. switch P B
 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
 hassis unit
 Removing the 3-pin regulator
 Removing the power amp and supply P B and the Power Trans P B
 Removing the sub power P B

MX-GA3V
1-6
<Disassembly of the main blocks of the set>
Replacement of the fuses and the power IC
 Replacing the fuses (See Fig.1, Fig.3)
 Prior to performing the following procedure, remove
the left side BOARD and remove tuner P B
(Fig.3,BB)
1. Replace the fuses inside.
[Caution] Be sure to use fuses with the specified ratings.
 Replacing the heat sink cover (See Fig.3)
1. Remove four screws B from the rear panel.
2. Pull the heat sink cover outward.
 Replacing the power IC (See Fig.2)
 Prior to performing the following procedure, remove
the top cover.
1. Remove the two screws A from the heat sink
between the power I .
2. Remove the solder fixing the power I .
Fig.3
BB
B
VIDEO OUT
110 V
127V
220V
230V
-240V
Bottom side Fig.1 A)
CN951
Fuse F952)
T1.6AL 250V
Fuse F951)
T2AL 250V
Fuse F953)
T1.25AL 250V
Add Lable
T2AL 250V
Add Lable
T1.25AL 250V
Component side Fig.1 B1)
Fuse F953)
T1.25AL 250V
Add Lable
T1.25AL 250V
Component side Fig.1 B2)
Fuse F951)
T2AL 250V Fuse F952)
T1.6AL 250V
WA
Fig.2

MX-GA3V
1-7
Fig.5 (A) Fig.5 (B)
Left Front panel assembly
Right Front panel assembly
 Removing the top cover
(See Fig.4 and 5)
1. Remove six screws B that retain the top cover from
the panel rear of the body.
2.
Remove eight screws C and D that retain the top
cover from the two sides of the body.
3. Remove the top cover from the body by lifting it
toward the rear.
DD
Fig.4
Top cover
B
VIDEO OUT
2
23
-2
CC

MX-GA3V
1-8
 Removing the CD changer unit
(See Fig.6 to 9)

Prior to performing the following procedures, remove
the top cover and both sides BOARD.
[Caution] Although the D mechanism unit can be
removed without removing the D 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
sections marked with arrows and pull out the D
tray toward the front.
b. Remove the D tray panel by pushing both of its
extremities upward in the direction of the arrows.
c. Push the D tray deep into the set.
1. Disconnect the cord wires from the D P B N704,
N607, N1101 and disconnect N1 (shield wire)
from back panel.
2.
From the rear of the set, remove two screws E and
two screws on the front panel left and right side.
3. Handle the D changer unit rear, take out the unit.
Fig.10
D changer
unit
Fig.6
D tray panel
Fig.7
D tray panel
Fig.8
Accessory
terminal
Antenna
termianl
E
F
F

MX-GA3V
1-9
Fig.10
H
Fig.12
I
Power amp and
supply P B
law
c
GND lug b
 Removing the front panel assembly
(See Fig.10 to 11)

Prior to performing the following procedures, remove
the top cover and both board.

Also remove the D changer unit.
1. Disconnect the parallel wire and the cord wire from
the connectors N701, N702, N703, N850 on
the power amp. and supply P B.
2. Remove two screws
H retaining the front panel
assembly onto the bottom of the body.
3. Remove two screws I on the left and right side of the set
retaining the panel front from the bottom and then
remove then GND lug
b that comes from the power
amp and supply P B.
4. Disengage the claws
c on both sides of the front
panel assembly and then remove the assembly.

MX-GA3V
1-10
Fig.14
D P B
Short round
N601
<Disassembly of units and assembly
inside this set>
 Removing the CD PCB
(See Fig.12 to 13)

Prior to performing the following procedures, remove
the top cover and both sides board.
 Also remove the D changer unit.
1. The two screws E that retain the V D assembly
should be removed.
2. Disconnect the wires from N602, N603, N604
and N605 on the D P B, which is located on
the back side of the D changer unit.
3. The two screws
J that retain the D P B should be
removed.
4. Remove the D P B by pulling it toward the side
where the N601 is located.
5.
Using solder, short the D pickup to connect to
short round.
[Caution] After re-connecting the wires, be sure to
remove the shorting solder from the GND
connection.
6. Disconnect the card wire from the connector N601
on the main P B and then remove the main P B.
Fig.12(A)
E
Fig.12(B)
J
D P B

MX-GA3V
1-11
Fig.14
D
Fig.16
K ( Silver color) K ( copper color)
K ( Silver color)
K ( copper color)
D changer
mechanism
assembly
 Removing the CD changer mechanism
assembly (See Fig.14 to 15)

Prior to performing the following procedures, remove
the top cover and both sides board.

Also remove the D changer unit.
1. Removing screws
D from the front chuck base of the
D changer mechanism unit.
2. Turn the D changer mechanism cover base and
remove screws
E connecting the unit to the D
changer mechanism assembly.
3. Removing four screws
K retaining the D mechanism
holder assembly.
[Caution] When replacing the D changer mechanism
assembly, be sure not to mistake the positions
of the silver color and copper color spring.
Fig.15
E
D changer
unit

MX-GA3V
1-12
Fig.17
F
D pic kup
Shaft
Fig.19
D
NO
Fig.18
M
L
Fig.20
Motor locker
Turn table motor
Obligue gear
 Removing the CD pickup (See Fig.17)

Prior to performing the following procedures, remove
the top cover and both sides board.
 Also remove the D changer unit.
 Also remove the D changer mechanism.
1. Widen the section F .
2. While keeping the section
F wide open, push the
section in the direction of the arrow to remove
the shaft, and then remove the D pickup.
 Replacing the loading motor and rotor
belt of the CD changer (See Fig .18)

Prior to performing the following procedures, remove
the top cover.
 Also open the D changer tray.
1.
Remove two screws L retaining the D changer
tray loading motor.
2. Remove 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. 19 and 20 )

Prior to performing the following procedures, remove
the top cover.
 Also remove the D changer unit.
1. Remove one screws
N retaining the D (Turn table).
2. Remove two screws
O retaining the stopper brackets
on both sides of the D changer unit.
3. Remove the stopper brackets from both sides of the
D changer unit.
4. Pull out the D tray from the D 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 D tray.

MX-GA3V
1-13
Fig.21
Z
Z
Front panel
assembly
Fig.22
P
Front panel
assembly
Earphone jack
P B
Front panel
assembly
Q
ontrol/FL
P B
Fig.23
 Removing the cassette deck mechanism
(See Fig.21)

Prior to performing the following procedures, remove
the top cover.

Also remove the D changer unit.

Also remove the front panel assembly.
1. Remove five screws
Z retaining the cassette deck
mechanism.
 Removing the earphone jack PCB and
Mic Jack PCB
(See Fig.22)

Prior to performing the following procedures, remove
the top cover and both sides board.

Also remove the D changer unit.

Also remove the front panel assembly.
1. Remove the screw with the washer,
P that
retains the earphone jack P B.
 Removing the control/FL PCB
(See Fig.21)

Prior to performing the following procedures, remove
the top cover and both sides board. Also remove
the D changer unit.

Also remove the D changer unit.

Also remove the front panel assembly.
1. Remove four screws
Q that retain the control/FL P B
from the back of the front panel unit.

MX-GA3V
1-14
Fig.25
Front panel
assembly
Volume
shaft
Fig.26
Key 1 P B
R
S
T
R
Key 2 P B Key 3 P B
 Removing the switch PCB and sound
mode and CD function switch PCB
(See Fig.23 to 26)

Prior to performing the following procedures, remove
the top cover and both sides board.
 Also remove the D changer unit.
 Also remove the front panel assembly.
1. Pull out the volume control knob and MI Volume
Knob from the front of the front panel assembly.
(Fig.24)
2. Remove four screws
Q retaining the front panel
assembly. (Fig.23)
3. Remove the control/FL P B.
4. Remove eleven screws R retaining the switch (key 1)
P B. (Fig.22)
5. Remove three screws S retaining the sound mode
(key 2) switch P B.
6. Remove two screws T retaining the D function
(key 3) switch P B.
Fig.24
Volume Knob
Front panel assembly
MI Volume
Knob

MX-GA3V
1-15
Fig.29
assette deck mechanism
(Back side)
Solder side of leaf switch
Fig.27
T
assette deck mechanism
(Front side)
 Removing the leaf switches of the cassette
deck mechanism (See Fig. 21 and 29)

Prior to performing the following procedures, remove
the top cover and both sides board.

Also remove the D changer unit.

Also remove the front panel assembly.
1. Remove five screws
Z that retain the cassette deck
mechanism. (Fig.21)
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.
 Removing the cassette deck main motor,
and replacing the main belts
(See Fig.21, 27 and 28)

Prior to performing the following procedures, remove
the top cover and both sides board.

Also remove the D changer unit.

Also remove the front panel assembly.
1. Remove five screws
Z retaining the cassette deck
mechanism. (Fig.21)
2. Remove the cassette deck mechanism.
3. Remove two screws
T retaining the main motor from
the front side of the cassette deck.
[Caution] After attaching the main motor, check the
orientation of the motor and the polarity of
the wires.
4. From the backside of the cassette deck, remove the
main motor and two main belts.
[Caution] The lengths of the cassette A (playback
only) and cassette
B (record/play) main
belts are different. When attaching the main
belts, use the longer belt for cassette
A .
Fig.28
assette deck mechanism
(Back side) assette deck main motor
Main belt
(For
B cassette)
Main belt
(For
A cassette)

MX-GA3V
1-16
Fig.30
Cassette deck mechanism
(Front side)
V
U
PB Head REC/PB Head
Removing the cassette deck heads
(See Fig. 21 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 five screws Zthat retain the cassette deck
mechanism. (Fig.21)
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 screw Uthat retains the head.
5. Remove screw Vthat retains the head.
6. Hold the head and slide it in the direction of the
arrow to remove it.
Removing the 3-pin regulator and bridge
diode
(See Q904, Q907 and Fig.31)
Prior to performing the following procedures, remove
the top cover and both sides board.
1. Remove two screws Athat connect the heat sink
cover to rear panel.
2. Pull the heat sink outward.
3. Remove two screws W that retains the heat sink the
3-pin terminal regulator Q904, Q907.
4. Remove the solder fixing the 3-pin regulator.
V U
W
Fig.31
A

MX-GA3V
1-17
Rear panel
hassis
Z
Power AMP and
supply P B
 Removing the power amp and supply PCB
and the power trans PCB
(See Fig. 2, 29 to 31)
 Prior to performing the following procedures, remove
the top cover and D changer unit.
1. Remove four screws
B from the rear panel. (Fig.3)
2. Pull the heat sink cover outward.
3. Remove four screws
AA from the rear panel between
the heat sink holder.
4. Remove two screws X that retain the speaker terminals
and AUX terminal.
5. Remove screws
YY that retains the rear panel, and
then remove the rear panel.
6. Disconnect the parallel wires from the connectors
FW951 on the power trans P B.
7. Remove the clamp of A power cord from the chassis.
8. Remove four screws AB that retain the power trans
P B and then remove the assembly.
Fig.33
BB
YY
VIDEO OUT
X
Y
Fig.34
AB A Selector
Switch
Fig.34

MX-GA3V
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
frequency characteristics(63,1,10kHz)
7. Blank tape
TAPE I : A -225 TAPE II : A -514
8. Torque gauge : For play and back tension forward;
TW2111A, Reverse; TW2121A
Fast Forward and Rewind;
TW2231A
9. Test disc: TS-1000(12cm), GRG-1211(8cm),
D-T05A
10. Jitter meter
11. Television
Measurement conditions
(Select correct A Line Volt.)
Power supply voltage
A 110V/127V/220V/230V~240V (50/60Hz) US/UX
Measurement
output terminal : Speaker out
: TP101(Measuring for TUNER/
DE K/ D/V D)
: Dummy load 6ohm
Radio input signal
AM modulation frequency : 400Hz
Modulation factor : 30%
FM modulation frequency : 400Hz
Frequency displacement : 22.5kHz
Frequency Range
AM US: 530kHz~1710kHz (10kHz)
531kHz~1629kHz (9kHz)
UX: 530kHz~1600kHz (10kHz)
531kHz~1602kHz (9kHz)
FM 87.5MHz~108MHz
Standard measurement positions of
volume and switch
Power : Standby (Light STANDBY Indicator)
Sound Turbo, A, BASS EX : OFF
Sound mode : OFF
Main VOL. : 0 Minimum
Travers mecha set position : Disc 1
Mic MIX VOL : MAX
E HO: 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.

MX-GA3V
1-19
Items Measurement
conditions Measurement method Standard
values
Adjusting
positions
assette deck mechanism
(Front side)
Head azimuth screw
(Forward side)
PB Head
(Deck-A)
RE /PB Head
(Deck-B)
Head azimuth screw
(Reverse side)
Head azimuth screw
(Reverse side)
Head azimuth screw
(Forward side)
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.
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 I A -225
Measurement output
terminal
: Erase head terminal
( N308 8-Pin)
Maximum output
80kHz+/-3kHz
Adjust the
head azimuth
screw only
when the head
has been
changed.
Use the High-
Impedance
Probe or
Frequency
counter input.
assette 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 OS coil (L2)
obtain the V.T is 1.40V +/-0.05V.
3. hange the receiving frequency to 600KHz (603KHz).
4. Adjust the Antenna coil ( L2 ) obtain maximum
sensitivity. (Adjust the SSG output to out of AG range.)
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 AG 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 OS
coil only when
the AM coil block
has been changed.
Adjust the IFT
only when the
IFT block has
been changed.
AM Tracking
Alignments
AM IFT Alignments
Note: The adjustment of CD section is not required.
 Tape recorder section
 Tuner section
 Arrangement of adjusting positions

MX-GA3V
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 TO reading
finishes
Automatic measurement
of TE amplitude and
automatic tuning of
TE balance
500mv/div
2ms/div Fig-1
Approx.3sec
pin 20 of
I 611(TE)
Approx
1.8V
VREF
Tracking error waveform at TO reading
Power ON Play Key
onfirm that the Focus error
S-cuve signal at the pin43 of
I 602 is approx.2Vp-p
onfirm that the signal from
pin4 I 602 is 0V as a
accelerated pulse during
approx.400ms.
onfirm the waveform of
the Tracking error signal.
at the pin 13 of I 601 (R617)
(See fig-1)
Automatic tuning of
Focus error gain
Automatic tuning of
Tracking error gain
TO reading
Play a disc
onfirm the eys-pattern
at the lead of Tp3
onfirm that the voltage at the pin2
of N602 is "H"\"L"\"H".
heck Point
heck that the voltage at the
pin57 of I 602 is + 5V?