Page 1
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MX-GT90
Area Suffix
US
UW
UY
Brazil,Mexico,Peru
MX-GT90
Singapore
Argentina
SP-MXGT90
(No MIC jack and MIC LEVEL volume for UY ver.)
Contents
Safety precautions
Important for laser products
Preventing static electricity
Disassembly method
Adjustment method
STANDBY/ON
STANDBY
CD-R/RW PLAYBACK
CA-MXGT90
1-2
1-3
1-4
1-5
1-25
PLAY & EXCHANGE
MX-GT90
SP-MXGT90
Flow of functional operation
until TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-29
1-30
1-30
1-31~50
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
No.20996
Jun. 2001
Page 2
MX-GT90
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 circuitr y 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 current 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 each exposed metal part,
particularly any exposed metal part having a return path to
the chassis, and measure the AC voltage across the resistor.
Now, reverse the plug in the AC outlet and repeat each
measurement. Voltage measured any must not exceed 0.75 V
AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).
0.15 F AC TYPE
1500 10W
Good earth ground
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
Place this
probe on
each exposed
metal part.
!
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 m ust 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 v oltage.
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.
In regard with component parts appearing on the silk-screen pr inted 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 JC version)
1-2
Page 3
Important for laser products
MX-GT90
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.
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.
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.
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.
POSITION OF LABELS
CLASS 1
LASER PRODUCT
WARNING LABEL
DANGER : Invisibie laser radiation
when open and interlock or
defeated.
AVOID DIRECT EXPOSURE TO
BEAM (e)
VARO : Avattaessa ja suojalukitus
ohitettaessa olet alttiina
näkymättömälle lasersäteilylle.Älä
katso säteeseen. (d)
VARNING : Osynlig laserstrålning
är denna del är öppnad och spårren
är
urkopplad. Betrakta ej strålen.
(s)
ADVARSEL :Usynlig laserstråling
ved åbning , når
sikkerhedsafbrydere er ude af
funktion. Undgå udsættelse for
stråling. (f)
1-3
Page 4
MX-GT90
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.
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
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 traverse unit (optical pickup)
1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific
details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse
unit. Be careful not to take too long a time when attaching it to the connector.
3. Handle the flexible cable carefully as it may break when subjected to strong force.
4. 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 traverse mechanism.
1. Remove the disk stopper and T. bracket on the CD changer mechanism
assembly.
2. Disconnect the harness from connector on the CD motor board.
3. CD traverse unit is put up as shown in Fig.1.
4. Solder is put up before the card wire is removed from connector CN601
on the CD servo control board as shown in Fig. 2.
(When the wire is removed without putting up solder, the CD pick-up
assembly might destroy.)
5. Please remove solder after connecting the card wire with CN601 when
you install picking up in the substrate.
CD changer
mechanism
assembly
CD traverse
unit
Flexible cable
Fig.1
Soldering
Fig.2
1-4
Page 5
MX-GT90
Disassembly method
<Main body>
Removing the metal cover
(See Fig.1 to 3)
1.
Remove the six screws A on the back of the body.
2.
Remove the two screws B on both sides of the
body.
3.
Remove the metal cover from the body by lifting the
rear part of the cover.
CAUTION:
Do not break the front panel tab fitted to
the metal cover.
A
A
Metal cover
Metal cover
A
Fig.1
B
Fig.2
Metal cover
B
Fig.3
1-5
Page 6
MX-GT90
Removing the CD changer mechanism
assembly (See Fig.4 to 6)
Prior to performing the following procedure, remove
the metal cover.
1.
Disconnect the card wire from connector CN561 on
the main board.
2.
Remove the two screws C on the upper side of the
body and the two screws D on the back of the rear
panel.
3.
Remove the plastic rivet attaching the main board.
4.
Remove the fan connector CN705.
5.
Pull both the rear panel and the front panel assembly
to the outside, then remove the CD changer
mechanism assembly by lifting the rear part of the
assembly. it is assembly to remove the fan's card
wire.
Front panel assembly
C
Main board
CN561
Fig.4
CD changer mechanism assembly
Main board
CN561
C
CD changer
mechanism assembly
Rear panel
Rear panel
CAUTION:
To prevent damage to the CD fitting, be
sure to pull both the rear panel and the
front panel assembly enough to remove
the CD changer mechanism assembly.
D
Plastic rivet
Front panel assembly
Fig.5
1-6
Page 7
MX-GT90
Removing the front panel assembly
(See Fig.6 to 10)
Prior to performing the following procedure, remove
the metal cover and CD changer mechanism
assembly.
1.
Disconnect the card wires from connector CN870,
CN871 and CN315 on the main board respectively.
2.
Remove the tie band and disconnect the wire from
connector CN703 on the amplifier board.
3.
Disconnect the wire from connector CN220 on the
transformer board.
4.
Remove the four screws E on the bottom of the
body.
5.
Release the two joints a on the lower right and left
sides of the body using a screwdriver, and remove
the front panel assembly toward the front.
Amplifier board
CN703
CN705
Transformer board
CN220
Tie band
Fig.6
Main board
CN870
CN871
CN315
Front panel
assembly
Front panel assembly
Fig.9
Joint a
Front panel assembly
Front panel assembly
Fig.7
Main board
E
(Bottom)
Fig.8
Joint a
Front panel assembly
Fig.10
1-7
Page 8
MX-GT90
Removing the tuner board
(See Fig.11 and 12)
Prior to performing the following procedure, remove
the metal cover and the CD changer mechanism
assembly.
1.
Disconnect the card wire from connector CN1 on the
tuner board on the right side of the body.
2.
Remove the plastic rivet fixing the tuner board.
3.
Remove the two screws F on the back of the body.
Removing the rear cover / rear panel
(See Fig.12 to 15)
Prior to performing the following procedure, remove
the metal cover and the CD changer mechanism
assembly.
F
Joint b
CN1
Plastic rivet
Fig.11
G
Tuner board
Rear panel
Rear panel
Joint b
1.
Remove the screw G attaching the rear cover on the
back of the body.
2.
Push each tab of the four joints b in the direction of
the arrow and release.
3.
Remove the ten screws H and two screws H' (US,
UW only) attaching the rear panel.
4.
Release the joints c on each lower side of the rear
panel using a screwdriver and remove the rear panel
backward.
Note : Remove the tuner board in case of necessity.
(Refer to Fig.22)
F
H
H
Rear cover
Fig.12
Rear panel
(US,UW only)
H'
H
Joint c
1-8
Rear panel
Fig.15
Rear panel
Fig.14
Joint c
Page 9
MX-GT90
Removing the main board
(See Fig.16 and 17)
Prior to performing the following procedure, remove
the metal cover, the CD changer mechanism
assembly, the rear panel and the tuner board.
1.
Disconnect the card wires from connector CN870,
CN871 and CN315 on the main board.
2.
Disconnect the flat wires from connector CN704 and
CN706 on the amplifier board.
3.
Remove the screw I attaching the main board on the
right side of the body.
4.
Disconnect connector CN211 and CN212 on the
main board from the regulator board.
CN871
CN315
Amplifier board
CN704,CN706
Front panel assembly
Main board
CN870
Fig.16
Plastic rivet
Front panel assembly
Main board
Removing the speaker terminal board
(See Fig.18)
Prior to performing the following procedure, remove
the metal cover, the CD changer mechanism
assembly and the rear panel.
REFERENCE:
1.
Disconnect connector CN217 on the speaker
terminal board from the regulator board.
It is not necessary to remove the main
board.
Regulator board
Regulator board
I
Fig.17
Fig.18
CN212
CN211
Speaker terminal board
CN217
1-9
Page 10
MX-GT90
Removing the voltage selector board
(See Fig. 19)
Prior to performing the following procedure, remove
the metal cover, the CD changer mechanism
assembly and the rear panel.
1.
Disconnect the wires from connector CN218, CN219
and CN250 on the voltage selector board
respectively.
2.
Remove the two tie band attaching the wire to the
voltage selector board.
3.
Disconnect connector CN213 on the voltage selector
board from the regulator board.
Removing the amplifier board / voltage
board / heat sink (See Fig.20 and 21)
Prior to performing the following procedure, remove
the metal cover, the CD changer mechanism
assembly and the rear panel.
1.
Remove the two tie band attaching the wire to the
amplifier board and the voltage board.
Voltage selector board
CN213
Amplifier board
CN704
CN706
Voltage
board
Regulator
board
Tie band
Tie band
Fig.19
CN218
CN219
Tie band
CN703
CN215
2.
Disconnect the wires from connector CN703, CN704
and CN706 on the amplifier board respectively.
3.
Disconnect connector CN215 on the amplifier board
and CN216 on the voltage board from the regulator
board (The heat sink and heat sink bracket will be
detached at once).
4.
Pull out the upper and lower heat sink brackets from
the heat sink respectively.
5.
Remove the four screws J attaching the amplifier
board to the heat sink.
6.
Remove the two screws K, the board bracket and
the voltage board.
K
J
Fig.21
Fig.20
J
Amplifier board
CN216
Heat sink
Voltage board
1-10
Page 11
MX-GT90
Removing the power transformer
assembly (See Fig.22 and 23)
Prior to performing the following procedure, remove
the metal cover, the CD changer mechanism
assembly and the rear panel.
1.
Disconnect the wires from connector CN218 and
CN219 on the voltage selector board.
2.
Remove the two tie band from the voltage s
elector
board.
3.
Disconnect the wire from connector CN204 on the
regulator board.
4.
Remove the plastic holder.
5.
Remove the four screws L attaching the transformer
assembly.
Removing the regulator board
(See Fig.23)
Voltage selector
board
Power cord
stopper
Power cord
Base chassis
Regulator board
CN204
Tie band
CN219
CN250
Fig.22
Transformer board CN220
CN218
Power transformer
assembly
L
Transformer
board
Prior to performing the following procedure, remove
metal cover, CD changer mechanism assembly, rear
panel, tuner board, main board, amplifier board,
voltage board, voltage selector board.
1.
Disconnect the wire from connector CN204 on the
regulator board.
2.
Remove the two screws M attaching the regulator
board.
Removing the power cord (See Fig.24)
Prior to performing the following procedure, remove
the metal cover, the CD changer mechanism
assembly and the rear panel.
1.
Disconnect the power cord from connector CN250
on the v
2.
Remove the tie band from the voltage s
3.
Move the power cord stopper upward and pull out it
from the base chassis.
oltage selector board.
elector board.
Plastic
holder
Regulator board
Voltage selector board
CN219
Power cord
stopper
Fig.23
CN218
M
Power transformer assembly
Power
transformer
assembly
L
Power cord
Tie band
Fig.24
CN250
1-11
Page 12
MX-GT90
<Front panel assembly>
Prior to performing the following procedure, remove
the metal cover, the CD changer mechanism
assembly and the front panel assembly.
Removing the cassette mechanism
assembly (See Fig.25)
1.
Disconnect the card wire from connector CN306 on
the head amplifier & mechanism control board.
2.
Remove the four screws M and three screws M'
attaching the cassette mechanism assembly.
Removing the display system control
board (See Fig.26 to 28)
1.
Remove the four screws O attaching the stay
bracket.
2.
Disconnect the card wires from connector CN316 and
CN880 on the display system control board.
Head amplifier
& Mechanism control board
CN306
N
N'
Cassette mechanism
assembly
N
N
N'
N'
Fig.25
O
3.
Remove the seven screws P attaching the display
system control board.
4.
If necessary, disconnect the wire from connector
CN911 on the front side of the display system control
board and unsolder FW915.
If necessary, remove the CD play board. (Fig. 29)
Removing the CD eject board
(See Fig.28 and 29)
1.
Remove the three screws Q attaching the CD eject
board.
2.
If necessary, unsolder FW915 on the CD eject
board.
CD eject board
FW915
(Soldering)
Q
Q
Display system control board
P
FW915
(Soldering)
P
CN880
P
Stay bracket
Fig.26
CN316
Display system control board
Fig.27
CD eject board
CN911
P
P
FW915
FW915
Fig.29
1-12
Display system control board
Fig.28
Page 13
MX-GT90
Removing the preset / tuning switch
board (See Fig.30 and 31)
Prior to performing the following procedure, remove
the display system control board.
1.
Pull out the preset knob on the front panel.
2.
Remove the five screws R attaching the preset /
tuning switch board.
Removing the operation switch board
(See Fig.31 and 32)
Prior to performing the following procedure, remove
the display system control board and the preset /
tuning switch board.
1.
Pull out the VOLUME knob on the front panel and
remove the nut. Pull out the SOUND MODE knob
and the SUB WOOFER level knob MIC LEVEL
volume knob(Only US, UW) toward the front.
R
PRESET knob
Preset / tuning switch board
R
Fig.30
SOUND MODE knob
SUB WOOFER
level knob
2.
Remove the twelve screws S and the screw S' (Only
US, UW) attaching the operation switch board.
3.
Release the wire clamp.
4.
Remove the screw T attaching the earth terminal
extending from the switch board.
Release each tab of the seven joints g retaining the
operation switch board.
VOLUME knob
Joint g
Joint g
S'
(US,UW only)
S
S
Joints g
Nut
MIC LEVEL
volume knob
(US,UW only)
Fig.31
S
Operation
switch board
Joint g
Wire clamp
S
Joints g
S
Fig.32
S
S
T
1-13
Page 14
MX-GT90
Removing the CD Servo control board
(See Fig.1)
1.Remove the metal cover.
2.Remove the CD changer mechanism assembly.
3.From bottom side the CD changer mechanism assembly,
remove the four screws A retaining the CD servo control
board.
4.Absorb the four soldered positions "a" of the right and
left motors with a soldering absorber.
5.Pull out the earth wire on the CD changer mechanism
assembly.
6.Disconnect the connector CN854 on the CD servo
control board.
7.Disconnect the card wire CN601 and the connector
CN801 on the CD servo control board.
A
a
a
CN854
A
CN651
CD servo control board
CN652
CN801
CN601
CN151
Removing the CD tray assembly
(See Fig.2~4)
Remove the front panel assembly.
1.
Remove the CD changer mechanism assembly.
2.
Remove the CD Servo control board.
3.
Remove the screw B' retaining the lod stopper.
4.
From the T.bracket section "b" and clamper base
5.
section "c" , remove both of the edges fixing the
rod(See Fig.2 and 3).
Remove the screw B retaining the disc stopper
6.
(See Fig.3).
Remove the three screws C retaining the T.bracket
7.
(See Fig.3).
Remove the screw D retaining the clamper assembly
8.
(See Fig.3).
From the left side face of the chassis assembly, remove
9.
the one screw E retaining both of the return spring and
lock lever(See Fig. 4).
10.
By removing the pawl at the section "d" fixing the return
spring, dismount the return spring(See Fig.4).
11.
Remove the three lock levers(See Fig.4).
T.Braket
Disc stopper
b
Rod
A
T.Braket
Fig.1
Fig.2
B
CC
A
Clamper base
d
Earth
wire
c
a
b
Clamper ass'y
1-14
Fig.3
B'
Lod stopper
(C/J version only)
C
D
Return spring
E
Lock lever
Fig.4
Page 15
MX-GT90
11.
Check whether the lifter unit stopper has been caught
into the hole at the section "e" of CD tray assembly as
shown in Fig.5.
Make sure that the driver unit elevator is positioned as
12.
shown in Fig.6 from to the second or fifth hole on the
left side face of the CD changer mechanism assembly.
[Caution]
13.
14.
15.
In case the driver unit elevator is not at above
position, set the elevator to the position as
shown in Fig.7 by manually turning the pulley
gear as shown in Fig.8.
Manually turn the motor pulley in the clockwise
direction until the lifter unit stopper is lowered from the
section "e" of CD tray assembly(See Fig.8).
Pull out all of the three stages of CD tray assembly in
the arrow direction "f" until these stages stop
(See Fig.6).
At the position where the CD tray assembly has
stopped, pull out the CD tray assembly while pressing
the two pawls "g and g' " on the back side of CD tray
assembly(See Fig.9). In this case, it is easy to pull out
the assembly when it is pulled out first from the stage
CD tray assembly.
Stopper
e
CD tray
assembly
Fig.5
Chassis assembly
Refer to Fig.7
Pawl
Fig.6
CD tray assembly
g
CD
CD
CD
f
Drive unit of elevator
Fig.7
3
2
1
CD tray assembly
Pulley gear
Motor pulley
Fig.8
Pawl ,
g
Fig.9
g'
1-15
Page 16
MX-GT90
Removing the CD loading mechanism
assembly(See Fig.10)
1.2.While turning the cams R1 and R2 assembly in the
arrow direction "h" ,align the shaft "i" of the CD loading
mechanism assembly to the position shown in Fig.10.
Remove the four screws F retaining the CD loading
mechanism assembly.
Removing the CD traverse mechanism
(See Fig.11 and 12 )
1.
For dismounting only the CD traverse mechanism
without removing the CD loading mechanism assembly,
align the shaft "j" of the CD loading mechanism
assembly to the position shown Fig.11 while turning the
cam R1 and R2 assembly in the arrow direction "k" .
By raising the CD loading mechanism assembly in the
2.
arrow direction "l", remove the assembly from the lifter
unit
Cam R1, R2 assembly
Arrow
k
Cams R1, R2 assembly
Arrow
h
i
F
F
CD loading mechanism assembly
Fig.10
F
F
CD traverse mechanism
j
Fig.11
Removing the CD pick unit
(See Fig.13 )
1.
Move the cam gear in the arrow direction "m" . Then,
the CD pickup unit will be moved in the arrow direction
"n" .
According to the above step, shift the CD pickup unit to
2.
the center position.
While pressing the stopper retaining the shaft in the
3.
arrow direction "o" , pull out the shaft in the arrow
direction "p".
After dismounting the shaft from the CD pickup unit,
4.
remove the CD pickup unit
Lifter unit
o
Stopper
Shaft
Fig.12
CD Pickup unit
n
m
Shaft
p
Stopper
Fig.13
Arrow
CD loading
mechanism
Shaft
Cam gear
l
1-16
Page 17
MX-GT90
Removing the try select switch board
(See Fig.14)
1.2.Remove the two screws G retaining the tray select
switch board.
Disconnect the tray select switch board from connector
CN804 on the CD servo control board.
Removing the cam unit
(See Fig.15 ~17 )
1.
Remove the CD loading mechanism assembly.
2.
While turning the cam gear "q", align the Paul "r"
position of the drive unit to the notch position(Fig.16) on
the cam gear "q".
Pull out the drive unit and cylinder gear(See Fig.17).
3.
While turning the cam gear "q", align the Paul "s"
4.
position of the select lever to the notch position(Fig.18)
on the cam gear "q".
Remove the four screws H retaining the cam unit(cam
5.
gear "q" and cams R1/R2 assembly)(See Fig.18).
Chassis assembly
Drive unit
CN851
CN854
Fig.14
Cam gear q
Tray select
switch board
CN804
G
Drive unit
Cylinder gear
r
Cam gear q
H
s
H
Fig.15
Cams R1, R2 assembly
Cam unit
J
Fig.16
Select lever
Fig.17
1-17
Page 18
MX-GT90
Removing the actuator motor and belt
(See Fig.18~21)
1.
Remove the two screws I retaining the gear bracket
(See Fig.18).
2.
While pressing the pawl "t" fixing the gear bracket in the
arrow direction, remove the gear bracket
(See Fig.18).
From the notch "u section" on the chassis assembly
3.
fixing the edge of gear bracket, remove and take out the
gear bracket(See Fig. 19).
Remove the belts respectively from the right and left
4.
actuator motor pulleys and pulley gears(See Fig. 18).
After turning over the chassis assembly, remove the
5.
actuator motor while spreading the four pawls "v" fixing
the right and left actuator motors in the arrow
direction(See Fig. 20).
[Note]
When the chassis assembly is turned over under
the conditions wherein the gear bracket and belt
have been removed, then the pulley gear as well
as the gear, etc. constituting the gear unit can
possibly be separated to pieces. In such a case,
assemble these parts by referring to the assembly
and configuration diagram in Fig. 21.
Chassis assembly
Pulley gear
Gear bracket
Belt
Motor pulley
I
Fig.18
Actuator motor
Pulley gear
Belt
Motor pulley
I
Pawl
t
u
Gear bracket
Fig.19
Assembly and Configuration Diagram
Pulley gear
Gear B
v
v
Fig.20
Pulley gear
Gear B
Cylinder gear
1-18
Gear C
Select gear
Gross gear L
Fig.21
Gross gear U
Gear C
Page 19
MX-GT90
Removing the cams R1/R2 assembly
and cam gear q(See Fig.22)
Remove the slit washer fixing the cams R1 and R2
1.
assembly.
By removing the two pawls "w" fixing the cam R1,
2.
separate R2 from R1.
Remove the slit washer fixing the cam gear "q".
3.
Pull out the cam gear "q" from the C.G. base assembly.
4.
Removing the C.G. base assembly
(See Fig.22 and 23)
Remove the three screws J retaining the C.G. base
assembly.
[Caution]
To reassemble the cylinder gear, etc.with the
cam unit (cam gear and cans R1/R2 assembly),
gear unit and drive unit, align the position of the
pawl "x" on the drive unit to that of the notch on
the cam gear "q". Then, make sure that the
gear unit is engaged by turning the cam gear
"q" (See Fig. 23).
Slit washer
Cam gear q
J
Slit washer
Cam R2
Pawl
w
Cam R1
Cam switch board
C.G. base assembly
Pawl
w
Notch
Pawl
x
Cylinder
gear
Drive unit
Fig.22
Cam gear q
Cam R1, R2 assembly
Gear unit
Gear bracket
Fig.23
1-19
Page 20
MX-GT90
< Cassette mechanism section >
Removing the playback,recording and eraser
heads (See Fig.1~3)
1. While shifting the trigger arms seen on the right
side of the head mount in the arrow direction,turn
the flywheel R in counterclockwise direction until
the head mount has gone out with a click
(See Fig. 1).
2. When the flywheel R is rotated in counterclockwise
direction, the playback / recording & eraser head will
be turned in counterclockwise direction from the
position in Fig.2 to that in Fig.3.
3. At this position, disconnect the flexible P.C.board
(outgoing from the playback head) from the
connector CN301 on the head amp. and mechanism
control P.C. board.
4. Remove the flexible P.C.board from the chassis
base.
5. Remove the spring "a" from behind the playback /
recording head.
6. Loosen the reversing azimuth screw retaining the
playback head.
7. Take out the playback head from the front of the
head mount.
8. The recording and eraser heads should also be
removed similarly according to Steps 1~7 above.
Flexible
P.C.board
Cassette mechanism
Trigger armHead mount
Fig.1
Playback/Recording &
eraser head
(Mechanism A side)
Flywheel R
Spring "a"
Trigger arm
Reassembling the playback, recording
and eraser heads (See Fig.3)
1. Reassemble the playback head from the front of
the head mount to the position as shown in Fig.3.
2. Fix the reversing azimuth screw.
3. Set the spring a from behind the playback head.
4. Attach the flexible P.C.board to the chassis base
as shown in Fig.3.
5. The recording and eraser heads should also be
reassembled similarly according to Steps 1~4
above.
CN301
Head amplifier & mechanism
control P.C. board
Fig.2
Playback head
Spring "a"
CN302
FPC holder
Fig.3
Flywheel R
(Mechanism A side)
Reversing azimuth
screw
Head
mount
Flexible
P.C.board
Head amplifier &
mechanism control
P.C. board
(Mechanism B side)
1-20
Page 21
Removing the head amp. and mechanism
control board (See Fig. 4)
MX-GT90
1.Remove the cassette mechanism assembly.
2.After turning over the cassette mechanism
assembly,remove the five screws "A" retaining
the head amplifier & mechanism control board.
3.Disconnect the connectors CN303 on the board
and the connectors CN301 and on CN302 both
the right and left side reel pulse boards.
4.When necessary, remove the 4pin parallel
wire soldered to the main motor
Removing the capstan motor assembly
(See Fig.5 to 7)
1.Remove the six screws "B" retaining capstan
motor assembly (See Fig. 5).
2.While raising the capstan motor, remove the
capstan belts A and B respectively from the
motor pulley (See Fig. 6).
Caution 1: Be sure to handle the capstan
belts so carefully that these belts
will not be stained by grease and
other foreign matter. Moreover,
these belts should be hand while
referring to the capstan belt
hanging method.(See Fig.6 and 7)
A
Flexible
board
Head amplifier &
mechanism control board
AA
CN303
CN302 CN301
Flexible
board
Fig.4
BB
Capstan motor
assembly
AA
Capstan
belt A
Fig.7 Fig.6
Capstan
belt B
Capstan
belt A
BBBB
Fig.5
Capstan motor
Capstan
belt B
Motor pulley
1-21
Page 22
MX-GT90
Removing the capstan motor (See Fig. 8)
From the joint bracket, remove the two screws "C"
retaining the capstan motor.
Removing the flywheel (See Fig. 9,10)
1.Remove the head amp. and mechanism control
P.C.Board.
2.Remove the capstan motor assembly.
3.After turning over the cassette mechanism, remove
the two slit washers "a" & "b" fixing the capstan shafts
R and L, and pull out the flywheels R and L respectively
from behind the cassette mechanism.
C
Capstan motor
Joint
bracket
C
Fig.8
Flywheel R Flywheel L
Flywheel R Flywheel L
Fig.10
Removing the reel pulse board and solenoid
(See Fig. 11)
1.Remove the five pawls (c,d,e,f,g) retaining
the reel pulse P.C.Board.
2.From the surface of the reel pulse P.C.Board parts,
remove the two pawls "h" and "i" retaining the solenoid.
hi
Solenoid
c
a
d
Slit
washer "a"
Fig.9
e
f
b
Slit
washer "b"
Reel pulse board
g
1-22
Solenoid
Fig.11
Page 23
Speaker section
Removing the front panel
(See Fig.1 and 2)
1.
Remove the four screws A attaching the front panel
on the front of the body.
2.
Pull out the front panel toward the front and
disconnect the wire from the two speaker terminals
of the speaker (tweeter) on the back of the front
panel.
A
MX-GT90
A
Front panel
Removing the speaker (tweeter)
(See Fig.3)
Prior to performing the following procedures, remove
the front panel.
1.
Remove the two screws B attaching the speaker
(tweeter) on the back of the front panel.
Removing the sub panel (See Fig.4)
Prior to performing the following procedures, remove
the front panel.
1.
Remove the six screws C attaching the sub panel
on the back of the front panel.
2.
Pull out the sub panel toward the front.
A
Front panel
Speaker terminals
A
Fig.1
Speaker (tweeter)
Fig.2
C
Front panel
Fig.4
C
Speaker (tweeter)
C
Sub panel
Front panel
B
Speaker (tweeter)
Fig.3
1-23
Page 24
MX-GT90
Removing the speaker (squawker)
(See Fig.5)
Prior to performing the following procedures, remove
the front panel.
1.
Remove the four screws E attaching the speaker
(squawker) on the front of the body.
2.
Disconnect the wire from the two speaker terminals
of the speaker (squawker).
Removing the speaker (woofer)
(See Fig.6 and 7)
Prior to performing the following procedures, remove
the front panel.
1.
Remove the eight screws D attaching the punch
panel on the front of the body.
Speaker (squawker)
E
E
Fig.5
2.
Remove the six screws F attaching the speaker
(woofer) on the front of the body.
3.
Remove the speaker (woofer) toward the front and
disconnect the wire from the two speaker terminals.
Removing the duct (See Fig.8)
1.
Remove the four screws G attaching the duct on the
upper side of the body.
2.
Move the duct upwards and pull out backward.
Caution :
When servicing SP-MXGT90 speaker system, never
push or pull the speaker system on the table or floor.
It will damage the leg cushions attached on the
bottom of speaker system.
Leg cushion is important to prevent vibration and
protect speaker system not to slip down from the
shelf or table.
Duct
G
Front panel
G
D
Speaker (squawker)
D
Punch panel
Fig.6
Speaker (woofer)
F
F
Fig.8
1-24
Fig.7
Page 25
Adjustment method
Measurement instruments required
for adjustment
1. Low frequency oscillator,
This oscillator should have a capacity to output 0dBs
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
VTT712 : For Tape speed and wow flutter ( 3kHz)
VTT724 : For Reference level (1kHz)
TMT7036 : For Head angle(10kHz),Play back frequency
characteristics(1kHz),and dubbing frequency
characteristics(63,1,10kHz)
Because of frequency-mixed tape with 63,1k,10k and
14kHz(250nWb/m -24dB).
Use this tape together with a filter.
7. Blank tape
TAPE : 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
AC220V(50Hz) : UY model
AC110/127/230-240V(50Hz) : US,UW model
Measurement
output terminal : Speaker out
:TP101(Mesuring for TUNER/DECK/CD)
:Dummy load 6ohm
MX-GT90
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)
Sub woofer VOL. : Minimum
Sound mode : OFF
Main VOL. : 0 Minimum
Traverse mecha set position : Disc 1
Mic MIX VOL : MAX (Only US,UW)
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.
1-25
Page 26
MX-GT90
Arrangement of adjusting positions
Cassette mechanism section (Mechanism A section)
Head azimuth
adjusting screw
(Forward side)
Playback
head
Head azimuth
adjusting screw
(Reverse side)
Cassette mechanism section (Back side)
Head azimuth
adjusting screw
(Forward side)
Playback, recording and eraser
heads or playback head
Head azimuth
adjusting screw
(Reverse side)
Cassette Mechanism Unit Section
Tape speed ADJ
Bias ADJ L
Bias ADJ R
1-26
Page 27
Tape recorder section
MX-GT90
Items Measurement
conditions
Confirmation
of head angle
Test tape
:TMT7036(10kHz)
Measurement
output terminal
:Speaker terminal
Speaker R
(Load resistor:6 )
:Headphone terminal
1.Playback the test tape TMT7036(10kHz).
2.With the playback mechanism or recording &
playback mechanism, adjust the head azimuth
screw so that the forward and reverse output
levels become maximum.After adjustment,lock
the head azimuth at least by half a turn.
3.In either case,this adjustment should be
performed in both the forward and reverse
directions with the head azimuth screw.
Confirmation
of tape speed
Test tape
:VTT712(3kHz) or
TMT7036(3kHz)
Measurement
output terminal
:Headphone terminal
<Constant speed>
Adjust VR301 so that the frequency counter reading
becomes 3,000Hz 60Hz when playing back the
test tape VTT712(3kHz)with the playback mechanism
or playback and recording mechanism after ending
forward winding of the tape.
Reference values for confirmation items
Items Measurement
Double tape
speed
conditions
Test tape
:TMT7036(10kHz)
Measurement
output terminal
:Speaker terminal
Speaker R
(Load resistance:6 )
measurement
output terminal
:Headphone terminal
After setting to the double speed motor, confirm
that the frequency counter reading becomes
4,800+400/-300Hz when the test tape VTT712
(3kHz) has been play back with the playback
mechanism.
Measurement method
Measurement method
Standard
values
Maximum
output
Tape speed
of decks
(A and B)
:3,000Hz
60Hz
Standard
values
4,800+400/
-300Hz
Adjusting
positions
Adjust the head
azimuth screw
only when the
head has been
changed.
VR301
Adjusting
positions
Playback
mechanism side
Difference
between the
forward and
reverse speed.
P.mecha and
R/P mecha
speed
Wow & flutter
Test tape
:TMT7036(10kHz)
Measurement
output terminal
:Headphone terminal
When the test tape VTT712(3kHz) has been played
back with the playback mechanism or recording and
playback mechanism at the beginning of forward
winding, the frequency counter reading of the
difference between both of the mechanisms should
be 6.0Hz or less.
When the test tape VTT712(3kHz) has been played
back with the playback mechanism or recording and
playback mechanism at the beginning of forward
winding the frequency counter reading of wow &
flutter should be 0.25% or less(WRMS).
60Hz or
less
with in
0.25%
JIS(WTD)
Both the playback
and recording &
playback
mechanism
Both the playback
and recording &
playback
mechanism
1-27
Page 28
MX-GT90
Electrical performance
Items Measurement
Adjustment of
recording bias
current
(Reference
value)
conditions
*Mode : Forward or
reverse mode
*Recording mode
*Test tape
: AC-225
Measurement output
terminal
:Both recording and
headphone terminals
Measurement method
1.With the recording and playback mechanism,
load the test tapes(AC-225 to TYP ),and set the
mechanism to the recording and
pausing conditions in advance.
2.After connecting 100 in series to the recorder
head,measure the bias current with a valve
voltmeter at both of the terminals.
3.After resetting the [PAUSE] mode,start recording.
At this time,adjust VR101 for LcH and VR201 for
RcH so that the recording bias current values
become 4.0 A (TYP ).
Standard
values
AC-225
:4.20 A
Adjusting
positions
LcH
:VR101
RcH
:VR201
Adjustment of
recording and
playback
frequency
characteristics
Reference frequency
:1kHz and 10kHz
(REF:-20dB)
Test tape
:TYP AC-225
Measurement input
terminal
:OSC IN
1.With the recording and playback mechanism,load
the test tape(AC-225 to TYP ),and set the
mechanism to the recording and pausing condition
in advance.
2.While repetitively inputting the reference frequency
signal of 1kHz and 10kHz from OSC IN, record and
playback the test tape.
3.While recording and playing back the test tape in
TYP ,adjust VR101 for LcH and VR201 for RcH
so that the output deviation between 1kHz and
10kHz becomes -1dB 2dB.
Reference values for electrical function confirmation items
Items Measurement
Recording
bias frequency
conditions
*Recording and
playback side forward
or reverse
*Test tape
:TYP AC-225
*Measurement
terminal BIAS TP on
P.C.board
1.While changing over to and from BIAS 1 and 2,
confirm that the frequency is changed.
2.With the recording and playback mechanism.
load the test tape (AC-225 to TYP ),and set the
mechanism to the recording and pausing
conditions in advance.
3.Confirm that the BIAS TP frequency on the
P.C.board is 100kHz 6kHz.
Measurement method
Output
deviation
between
1kHz and
10kH
:-1dB 2dB
Standard
values
100kHz
+9kHz
-7kHz
LcH
:VR101
RcH
:VR201
Adjusting
positions
Eraser current
(Reference
value)
*Recording and
playback side forward
or reverse
*Recording mode
*Test tape
:AC-225
Measurement terminal
Both of the eraser
head
1.With the recording and playback mechanism,
load the test tapes(AC-225 to TYP ),and set the
mechanism to the recording and pausing condition
in advance.
2.After setting to the recording conditions,connect
1M in series to the eraser head on the recording
and playback mechanism side,and measure the
eraser current from both of the eraser terminal.
1-28
TYP
:75mA
Page 29
Flow of functional operation until TOC read
Power ON
Play Key
Slider turns REST
SW ON.
Automatic tuning
of TE offset
Confirm that the voltage at the pin5
of CN801 is "H"\"L"\"H".
MX-GT90
Check Point
Tracking error waveform at TOC reading
Approx.3sec
Tracking
servo
off states
Automatic measurement
of TE amplitude and
automatic tuning of
TE balance
VREF
pin 25 of
IC601(TE)
Approx
1.8V
Disc states
to rotate
Tracking
servo
on states
Disc to be
braked to stop
TOC reading
finishes
500mv/div
2ms/div
Fig.1
Laser ON
Detection of disc
Automatic tuning of
Focus offset
Automatic measurement of
Focus S-curve amplitude
Disc is rotated
Focus servo ON
(Tracking servo ON)
Automatic measurement of
Tracking error amplitude
Automatic tuning of
Tracking error balance
Check that the voltage at the
pin40 of IC651 is + 5V?
Confirm that the Focus error
S-cuve signal at the pin28 of
IC651 is approx.2Vp-p
Confirm that the signal from
pin24 IC651 is 0V as a
accelerated pulse during
approx.400ms.
Confirm the waveform of
the Tracking error signal.
at the pin 25 of IC601 (R604)
(See fig-1)
Automatic tuning of
Focus error balance
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 TP1
1-29
Page 30
MX-GT90
Maintenance of laser pickup
(1) Cleaning the pick up lens
Before you replace the pick up, please try to
clean the lens with a alcohol soaked cotton
swab.
(2) Life of the laser diode
When the life of the laser diode has expired,
the following symptoms will appear.
1. The level of RF output (EFM output : ampli
tude of eye pattern) will below.
Is the level of
RFOUT under
1.25V 0.22Vp-p?
YES
O.K
NO
Replace it.
Replacement of laser pickup
Turn off the power switch and, disconnect the
power cord from the ac outlet.
Replace the pickup with a normal one.(Refer
to "Pickup Removal" on the previous page)
Plug the power cord in, and turn the power on.
At this time, check that the laser emits for
about 3seconds and the objective lens moves
up and down.
Note: Do not observe the laser beam directly.
Play a disc.
Check the eye-pattern at TP1.
Finish.
(3) Semi-fixed resistor on the APC PC board
The semi-fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser
power. Since this adjustment should be performed to match the characteristics of the whole optical block, do not
touch the semi-fixed resistor.
If the laser power is lower than the specified value, the laser diode is almost worn out, and the laser pickup should
be replaced.
If the semi-fixed resistor is adjusted while the pickup is functioning normally, the laser pickup may be damaged
due to excessive current.
1-30
Page 31
Description of major ICs
AN7345(IC302) : PB/REC amp.
1. Block diagram
MX-GT90
L1
24
1
R1
2. Pin Function
Pin
Symbol
No.
1
R1
2
R2
L2
NF1
OUT1
22
23
Pre
AMP
Pre
AMP
2
3
R2
I/O
I
Playback amplifier input
Playback amplifier input
I
NF2
OUT2
4
EQ1
2021
EQ
CTRL
5
EQ2
Function
CTL1
Pre
Source
CTRL
6
CTL2
RIN1
RNF1
1819
17
78
RIN2
RNF2
ROUT1
ALC
AMP
ALC
AMP
ROUT2
Pin
No.
13
14
9
Vcc
RF
EQ
CTL
10 11
LC
Symbol
141516
ALC
LPF GND
RF
REPPLE
REJ
I/O
I
I
Ripple filter
VCC
13
12
Function
Power supply
3
NF2
4
OUT2 Playback amplifier output
EQ2 I
5
CTL2 I Pre Amplifier input switching time
6
RIN2 I
7
RNF2 I Recording amplifier negative feedback
8
ROUT2
9
LC I
10
11
LPF
GND I
12
I
Playback amplifier negative feedback
O
Equalizer
constant
Recording amplifier input
Recording amplifier output
O
ALC low cut
ALC low pass filter
I
EQCTL EQ control
15
16
ROUT1
17
RNF1 Recording amplifier negative feedback
RIN1
18
CTL1
19
20
EQ1 Equalizer
21
OUT1
NF1
22
L2 I
23
24
L1
I
O
Recording amplifier output
I
I Recording amplifier input
Pre amplifier input switching control
I
I
Playback amplifier output
O
Playback amplifier negative feedback
I
Playback amplifier input
Playback amplifier input
I
1-31
Page 32
MX-GT90
BA15218F-XE (IC652) / BA15218N (IC481,501,502,526,571) : Dual op. amp.
1. Pin layout
OUT1 1
-IN1 2
+IN1 3
VEE 4
2. Block diagram
Vcc
-IN
+IN
1
2
R1
Q5
Q1
Q2
D1
Q3 Q4
8 Vcc
7 OUT2
6 -IN2
5 +IN2
C2
Q9
R5
Q6
Q8
Q10
Q7
R7
Q11
R6
Q12
R8
Q18Q13
OTHER
CH
Q19
Q17Q16
VEE
C1
R3R2
R4
OUTPUT
Q14 Q15Q114
R9
1-32
Page 33
BA3126N(IC301) : R/P switch
MX-GT90
S W
R E C
G
123456789
P / B
S W
C O N T .
G N D
V c c
P / B
S W
G
BU4094B(IC303):Serial to parallel port extension
1.Pin layout
STROBE
DATA
CLOCK
Q1
Q2
Q3
Q4
Vss
1
2
3
4
5
6
7
8
16
Vdd
15
OUTPUT ENABLE
14
Q5
13
Q6
12
Q7
11
Q8
10
Q's
9
Qs
CLOCK
STROBE
2.Block diagram
DATA
2
3
1
S W
R E C
8-STAGE
SHIFT REGISTER
8-BIT
LATHES
10
9
Q's
Qs
SERIAL
OUTPUT
OUTPUT
ENABLE
KIA7019AP (IC830) : Voltage detector
1. Pin layout
1 2 3
15
Q1
2. Pin function
Pin No.
1
2
3
3-STATE
OUTPUTS
Q8
PARALLEL OUTPUT
Function
Vcc
Ground
OUT
1-33
Page 34
MX-GT90
LB1641 (IC851,IC852) : DC motor driver
1. Pin layout
1 2 3 4 5 6 7 8 9
GNDOUT1 P1
VZ IN1 IN2
VCC1
VCC2 P2
2. Pin function
Input Output
IN1 IN2 OUT1 OUT2
0 0 0 0
1 0 1 0
0 1 0 1
1 1 0 0
NJM4580L (IC901) : Mic amplifier
10
OUT2
Mode
Brake
CLOCKWISE
COUNTER-CLOCKWISE
Brake
1. A OUTPUT
2. A-INPUT
3. A+INPUT
-
4. V
5. B+INPUT
6. B-INPUT
1
2
34
5
6
7
8
7. B OUTPUT
1-34
Page 35
BA3835S (IC812) : SPI B.P.F.
1.Block Diagrams
MX-GT90
BIASC
VREFC
RREF
DIFOUT
N.C.
N.C.
CIN
AIN
VCC
1
2
3
4
5
6
7
8
9
2.Pin Function
No. Symbol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
BIASC
VREFC
RPEF
NC
NC
NC
CIN
AIN
VCC
SPI-A
SPI-B
SPI-C
SPICSB
NC
NC
TEST
AOUT
GND
A-C
DIF
105Hz
BPF
340Hz
BPF
1kHz
BPF
3.4kHz
BPF
10.5kHz
BPF
REFERENCE
CURRENT
PEAK
HOLD
PEAK
HOLD
PEAK
HOLD
PEAK
HOLD
PEAK
HOLD
I/O
-
-
-
-
-
-
I
O
O
O
O
-
-
O
-
BIAS
VREF
RES
RES
MPX
RES
RES
RES
DEC
18
17
16
15
14
13
12
11
10
GND
AOUT
TEST
N.C.
N.C.
SEL
C
B
A
Function
Decoupling condenser connection terminal.
Decoupling condenser connection terminal.
Reference resistance connection terminal.
Non connect.
Non connect.
Non connect.
Connected to GND of audio system through a condenser.
Inputs the audio signal through a condenser.
Power supply terminal.
Output selection control terminal.
Output selection control terminal.
Output selection control terminal.
Output selection control terminal.
Non connect.
Non connect.
Connected to GND upon normal use.
Multi-plexor output terminal.
Connect to GND.
1-35
Page 36
MX-GT90
BA3837(IC466):MIC mixer
1.Block diagram
C
16
B
15
14
A
ROUT
13
LP
12
LP
11
LP
10
RIN
9
1
VCC
2.Pin function
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
LOGIC
+
-
2
MIC
Symbol
VCC
MIC IN
LOUT
FK
TK
LIN
BIAS
GND
RIN
LPF1
LPF2
LPF3
ROUT
CONTA
CONTB
CONTC
-
+
3
LOUT
+
-
SW2 SW1
4
FK
I/O
Power supply
Microphone mixing input
I
O
O
O
O
O
Channel L output
Non connect
Non connect
Channel L input
I
Signal bias
I
Connect to GND
Channel R input
I
Connects to LPF time constant element
Connects to LPF time constant element
LPF outpout
Channel R output
Mode select input A
I
Mode select input B
I
Mode select input C
I
5
TK
-
+
R
L+R
-
+
L-R
L
+
-
6
LIN
Description
7
BIAS
-
+
+
8
GND
1-36
Page 37
BU9253AS(IC902) : LPF&ECHO MIX.
1.Pin layout & block diagram
1
GND
ECHO VR
BIAS
DAINT IN
2
3
4
5
OSC
COUNTER
18
17
16
15
14
MX-GT90
CR
MUTE
VCC
ADINT IN
DAINT OUT
DALPF IN
DALPF OUT
MIX OUT
2.Pin function
Pin No. Symbol
1
2
ECHO VR
3
4
5
6
7
8
9
DAINT IN
DAINT OUT
DALPF IN
DALPF OUT
MIX OUT
10
11
12
13
14
ADLPF IN
ADLPF OUT
ADINT OUT
ADINT IN
15
16
17
18
6
7
- +
8
9
GND
BIAS
MIX IN
VCC
NC2
MUTE
CR
D/A
MIX
SRAM
I/O
I
-
I
O
I
O
O
I
I
O
O
I
-
-
I
-
A/D
13
ADINT OUT
12
ADLPF OUT
- +
11
ADLPF IN
10
MIX IN
Descriptions
Connect GND
Echo level control
Non connect
Analog part DC bias
DA side integrator input
DA side integrator output
DA side LPF input
DAside LPF output
Mix AMP output for original tone& echo tone
Mix AMP input pin for original tone
AD side LPF input
AD side LPF output
AD side integrator output
AD side integrator input
Power supply
Non connect
Mute control signal input
CR pin for oscillator
1-37
Page 38
MX-GT90
LA1838(IC1): FM AM IF AMP&detector, FM MPX decoder
1. Block Diagram
30
ALC
BUFF
FM
S-METER
FM IF
1
2. Pin Function
Pin
Symbol
No.
FM IN
1
AM MIX
2
3
FM IF
AM IF
4
GND
5
6
TUNED
STEREO
7
8
VCC
9
FM DET
10
AM SD
FM VSM
11
AM VSM
12
13
MUTE
14
FM/AM
MONO/ST O
15
29
28
AM
OSC
SD
COMP
S-CLRVE
PM
DET
2
I/O
I
This is an input terminal of FM IF
REG
AM
MIX
AM/FM
IF-BUFF
3
27
FM
RF.AMP
AM IF
4
26
AGC
AM
S-METER
GND
Function
DET
TUNING
DRIVE
5
signal.
This is an out put terminal for AM
O
mixer.
I
Bypass of FM IF
Input of AM IF Signal.
I
I
This is the device ground terminal.
When the set is tuning, this terminal
O
becomes "L".
O
Stereo indicator output. Stereo "L",
Mono: "H"
III
This is the power supply terminal.
I
FM detect transformer.
I
This is a terminal of AM ceramic filter.
O
Adjust FM SD sensitivity.
O
Adjust AM SD sensitivity.
I/O
When the signal of IF REQ of IC121(
LC72131) appear, the signal of FM/AM
IF output. //Muting control input.
Change over the FM/AM input.
I
"H" :FM, "L" : AM
Stereo : "H", Mono: "L"
25
21
DECODER
ANIT-BIRDIE
STEREO
5N
SW
10
I/O
O
O
I
20
FF
38k
11
Left channel signal output.
Right channel signal output.
Input terminal of the left channel post
24
STEREO
DRIVE
6
7
22
23
P-DET
VCC
89
Pin
Symbol
No.
16
L OUT
17
R OUT
18
L IN
VCO
384KHz
18
19
MUTE
FF
/
19k
2
12 13
FF
19k
/
LS
Function
17 16
PILOT
DET
15
14
AMP.
Input terminal of the right channel
19
R IN
I
post AMP.
Mpx Right channel signal output.
20
24
21
22
23
25
RO
LO
IF IN
FM OUT
AM DET
AM AGC
O
O
Mpx Left channel signal output.
I
Mpx input terminal
FM detection output.
O
AM detection output.
O
This is an AGC voltage input terminal
I
for AM
I
26
AFC
This is an output terminal of voltage
for FM-AFC.
27
28
AM RF
REG
AM RF signal input.
I
Register value between pin 26 and pin28
O
desides the frequency width of the
input signal.
29
AM OSC
I
This is a terminal of AM Local
oscillation circuit.
30
OSC BUFFER
AM Local oscillation Signal output.
O
1-38
Page 39
LA6541-X (IC801) : Servo driver
1. Pin Layout & block diagram
MX-GT90
Vcc Vref Vin4 Vg4 Vo8 Vo7
24 23
11k
ohm
22
20
21
19
Vcc
Gnd
Vo6 Vo5 Vg3 Vin3 Cd Res
18
17 16
- +
- +
Level
shift
Level
shift
11k
ohm
1
2
3456
Vcc Mute Vin1 Vg1 Vo1 Vo2 Vo3 Vo4 Vg2 Vin2 Reg
B T L
driver
B T L
driver
Gnd
B T L
driver
B T L
driver
7 8 9101112
Level
shift
Level
shift
2. Pin function
Pin
Symbol Function
No.
1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
2
3
4
5
6
7
8
9
Vcc
Mute
Vin1
Vg1
Vo1
Vo2
Vo3
Vo4
Vg2
Vin2
Reg Out
Reg In
Res
Cd
Vin3
Vg3
Vo5
Vo6
Vo7
Vo8
Vg4
Vin4
Vref
Vcc
Power supply (Shorted to pin 24)
All BTL amplifier outputs ON/OFF
BTL AMP 1 input pin
BTL AMP 1 input pin (For gain adjustment)
BTL AMP 1 input pin (Non inverting side)
BTL AMP 1 input pin (Inverting side)
BTL AMP 2 input pin (Inverting side)
BTL AMP 2 input pin (Non inverting side)
BTL AMP 2 input pin (For gain adjustment)
BTL AMP 2 input pin
External transistor collector (PNP) connection. 5V power supply output
External transistor (PNP) base connection
Reset output
Reset output delay time setting (Capacitor connected externally)
BTL AMP 3 input pin
BTL AMP 3 input pin (For gain adjustment)
BTL AMP 3 output pin (Non inverting side)
BTL AMP 3 output pin (Inverting side)
BTL AMP 4 output pin (Inverting side)
BTL AMP 4 output pin (Non inverting side)
BTL AMP 4 output pin (For gain adjustment)
BTL AMP 4 output pin
Level shift circuit's reference voltage application
Power supply (Shorted to pin 1)
15
11k
ohm
14
13
RESET
Regulator
11k
ohm
out
Reg
In
1-39
Page 40
MX-GT90
MN101C35DEC3 (IC810) : System controller
Pin function (1/2)
Pin No.
1
2
3
4
5
6
7
8
9,10
11
12,13
14
15
16C19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47~63
Symbol
KCMND
MSTAT
KCLK
DATAOUT
DA TAIN
CK
NC
VDD
OSC2,1
VSS
NC
MMOD
VREF-
KEY1~4
SLCKEY1
SLCKEY2
NC
SPIDTI
VREF+
MRDY
RESET
BASS VOL+
BASS VOLAUX MUTE
RDSDATA/KARA
SPI A
SPI B
REMIN
PHOTOA
PHOTOB
SOUNDMODE+
RDS_CLK
PRT
TAPE LED
ECON
POUT
VOLDA/EXT
VOLCK/EXT
EXTCE
SLCCE
VC3 RESET
G17~1
I/O
O
I
O
O
I
O
-
-
I/O
-
-
-
-
I
I
I
-
I
-
I
I
I
I
O
I
O
O
I
I
I
I
I
I
O
O
O
O
O
O
O
O
O
Function
VC3 Serial data output
VC3 status input
VC3 Serial clock
SLC/TUNER data output
TUNER data input
SLC/TUNER clock
Not used
Power supply +5V
Oscillation terminal (8MHz)
Connect to GND
Not used
Connect to GND
Connect to GND
Key matrix input 1~4
SLC Key input 1
SLC Key input 2
Not used
SPI Analog data input
AD +5V
VC3 Ready
Micon reset
Bass volume +
Bass volume AUX muting
RDS Data / Karaoke
SPI A data
SPI B data
Remote control signal input
SLC Photo-A
SLC Photo-B
Soundmode reverse
RDS Clock
Protector input
Tape LED
Economy ON
Power ON
Volume / EXT IC Data
Volume / EXT IC CLK
EXT IC Chip select
SLC Chip enable
VC3 Reset
FL Display grid
1-40
Page 41
Pin function (2/2)
MX-GT90
Pin No.
64~85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
Symbol
P22~P1
TUCE
SMUTE
SEARCH LE
CD1 LED
CD2 LED
CD3 LED
R SEARCH
MSI
MPX
INH
F SEARCH
VOL -
VOL +
SOUNDMODE
VPP
I/O
O
O
O
O
O
O
O
I
I
I
I
I
I
I
I
-
Function
FL segment control signal output
Tuner chip enable
System mute
Skip LED
LED Control signal output (CD1)
LED Control signal output (CD2)
LED Control signal output (CD3)
Reverse skip
Music scan input
Tuner stereo indicator
Backup mode detect
Forward skip
Rotary encoder VOLRotary encoder VOL+
Soundmode foeward
-B for FL
1-41
Page 42
MX-GT90
MN662748RPM (IC651) : Digital servo & digital signal processer
1. Pin layout
2.Block diagram
LRCKIN(MSEL)
BCLK(SSEL)
SRDATAIN
(PSEL)
IOSEL
CLVS
CRC
BLKCK
CLDCK
SBCK
SUBC
DEMPH
RESY
FLAG6(RESY)
SSEL
SQCK
SUBQ
AVDD2
AVDD2
PCK
EFM
PLLF
DSLF
IREF
DRF
ARF
RSEL
PSEL
MLD
MCLK
MDATA
CK384(EFM)
VCOF
BYTCK
SMCK
FCLK
CSEL
MSEL
X2
X1
ÊSTAT
DIGITAL
DEEMPHSIS
SUB
CODE
BUFFER
DSL.
PLL
VCO
VCO
ITUNING
GENERATION
PITCH
CONTROL
20 ~ 1
21
~
40
41 ~ 60
8TIMES
OVER SAMPUNC
DIGITAL FILTER
EFM
DEMODULATION
SYNC
INTERPOLATION
SUBCODE
DEMODULATION
MICRO
COMPUTER
INTERFACE
COVERTER
A/D
80
~
61
CIRC
ERROR
CORRECTION
DEINTERLEVE
CLV
SERVO
1BIT
DAC
LOGIC
S
16k
SRAM
INPUT
PEM
(R)
PEM
(L)
D/A
CONVERTER
OUTPUT
DIGITAL
AUDIO
INTERFASE
DIGITAL
AUDIO
INTERFASE
INTER POLATION
SOFT MUTING DIGITAL
ATTENUATION
PEAK DETECTIVE
AUTO CUE
PORT
SERVO
TIMING GENERATOR
AVSS1
AVDD1
OUTR
OUTL
FLAG
IPFLAG
TX
ECM
PC
LRCK
SRDATA
BCLK
DMUTE
TRKV
KICK
VREF
TRVSTR
ECS
TVD
TRD
FOD
TBAL
FBAL
TOFS
TES
/TLOCK
/FLOCK
PLAY
LDON
WVEL
SENSE
D
/
D
V
V
V
S
D
D
S
D
D
1
/
R
V
T
S
S
E
T
S
S
1
T
F
E
1-42
R
T
F
E
E
N
V
T
R
C
R
S
B
V
D
D
O
E
T
/
R
F
D
E
O
F
T
Page 43
3. Pin function
Pin
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Dymbol
BCLK
LRCK
SRDATA
DVDD1
DVSS1
TX
MCLK
MDATA
MLD
SENSE
FLOCK
TLOCK
BLKCK
SQCK
SUBQ
DMUTE
STATUS
RST
SMCK
PMCK
TRV
TVD
PC
ECM
ECS
KICK
TRD
FOD
VREF
FBAL
TBAL
FE
TE
RF ENV
VDET
OFT
TRCRS
RFDET
BDO
LDON
I/O
O
O
O
O
I
I
I
O
O
O
O
I
O
O
I
O
O
O
O
O
O
O
I
O
O
I
I
I
I
I
I
I
I
O
Function
Not used
Not used
Not used
I
Power supply (Digital)
I
Connected to GND
Digital audio interface output
CPU command clock signal input
(Data is latched at signal's rising point)
CPU command data input
CPU command load signal input
Sense signal output
Focus lock signal output Active :Low
Tracking lock signal output Active :Low
sub-code/block/clock signal output
Outside clock for sub-code Q resister input
Sub-code Q -code output
I
Connected to GND
Status signal
(CRC,CUE,CLVS,TTSTOP,ECLV,SQOK)
Reset signal input (L:Reset)
I
Not used
I
Not used
Traverse enforced output
Traverse drive output
I
Not used
Spindle motor drive signal (Enforced
mode output) 3-State
Spindle motor drive signal (Servo error
signal output)
Kick pulse output
Tracking drive output
Focus drive output
Reference voltage input pin for D/A
output block (TVD,FOD,FBA,TBAL)
Focus Balance adjust signal output
Tracking Balance adjust signal output
Focus error signal input (Analog input)
Tracking error signal input (Analog input)
RF envelope signal input (Analog input)
Vibration detect signal input (H:detect)
Off track signal input (H:off track)
Track cross signal input
RF detect signal input (L:detect)
BDO input pin (L:detect)
Laser ON signal output (H:on)
Pin
No.
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
Symbol
PLLF2
TOFS
WVEL
ARF
IREF
DRF
DSLF
PLLF
VCOF
AVDD2
AVSS2
EFM
PCK/
DSL2
VCOF2
SUBC
SBCK
VSS
XI
X2
VDD
BYTCK
CLDCK
FCLK
IPPLAG
FLAG
CLVS
CRC
DEMPH
RESY
IOSEL
TEST
AVDD1
OUT L
AVSS1
OUT R
RSEL
CSEL
PSEL
MSEL
SSEL
I/O
Tracking error shunt signal output (H:shunt)
O
I
Not used
I
Not used
I
RF signal input
Reference current input pin
I
Bias pin for DSL
I
I/O
Loop filter pin for DSL
Loop filter pin for PLL
I/O
I
Not used
I
Power supply (Analog)
Connected to GND (Analog)
II
Not used
O
DSL balance output
I
The external circuit is regulated for crystal.
I
Not used
I
Not used
Connected to GND (for X'tal oscillation
I
circuit)
I
Input of 16.9344MHz X'tal oscillation circuit
O
Output of X'tal oscillation circuit
I
Power supply (for X'tal oscillation circuit)
I
Not used
I
Not used
I
Not used
I
Not used
I
Not used
I
Not used
I
Not used
Not used
I
Not used
III
pull up
pull up
Power supply (Digital)
O
Lch audio output
I
Connected to GND
O
Rch audio output
II
pull up
Connected to GND
I
Connected to GND
I
Connected to GND
I
Pull up
Function
MX-GT90
1-43
Page 44
MX-GT90
LC72136N (IC2) : PLL frequency synthesizer
1. Pin layout
FM/AM
CLOCK
FM/ST/VCO
AM/FM
2. Block diagram
XT
CE
DI
DO
LW
MW
SDIN
1
2
3
4
5
6
7
8
9
10
11
22
21
20
19
18
17
16
15
14
13
12
XT
GND
LPFOUT
LPFIN
PD
VCC
FMIN
AMIN
IFCONT
IFIN
1
22
16
15
3
4
5
6
17
21
3. Pin function
Pin
Symbol
No.
1
2
3
4
5
6
7
8
9
10
11
XT
FM/AM
CE
DI
CLOCK
DO
FM/ST/VCO
AM/FM
LW
MW
SDIN
Reference
Driver
Swallow Counter
1/2
C
2B
I/F
Power
on
Reset
Function
I/O
X'tal oscillator connect (75kHz)
I
LOW:FM mode
O
When data output/input for 4pin(input) and
I
Swallow Counter
1/16,1/17 4bit
1/16,1/17 4bit
12bit
Programmable
DriverS
Data Shift Register & Latch
782
6pin(output): H
Input for receive the serial data from
I
controller
Sync signal input use
I
Data output for Controller
O
Output port
"Low": MW mode
O
Open state after the power on reset
O
Input/output port
I/O
Input/output port
I/O
Data input/output
I/O
Phase
Detector
Charge Pump
Unlock
Detector
Universal
Counter
11
13
Pin
Symbol
No.
IFIN
12
IFCONT
13
14
AMIN
15
FMIN
16
VCC
17
18
19
20
12
I/O
Function
IF counter signal input
I
IF signal output
O
Not use
-
AM Local OSC signal output
I
FM Local OSC signal input
I
Power suplly(VDD=4.5-5.5V)
When power ON:Reset circuit move
PLL charge pump output(H: Local OSC
18
PD
O
frequency Height than Reference frequency.
L: Low Agreement: Height impedance)
Input for active lowpassfilter of PLL
19
20
21
22
LPFIN
LPFOUT
GND
XT
I
Output for active lowpassfilter of PLL
O
Connected to GND
X'tal oscillator(75KHz)
I
1-44
Page 45
STK412-010 (IC701) : Power amplifier
1.Pin layout
MX-GT90
2.Block diagram
TR1
14
TR3
15
16
TR5
R2
13
18
18
17
1
1
R16
R14
R15
C12
D12
TR12
TR14
C11
R11
TR15
R12
TR11
TR13
TR41
TR51
D41
D51
R41
Comparator
Comparator
R51
D42
D43
D53
D52
SUB
3
2
7
5
4
TR19
R13
TR16
TR18
TR20
TR17
TR8
TR9
TR10
TR7
R7
D2
TR2
R1
C1
TR4
D1
R3
TR6
C2
R4
R5
R6
6
12
11
8
9
10
1-45
Page 46
MX-GT90
STK402-050 (IC602) : Power amplifier
1.Pin layout
115
2.Block diagram
4
R1
TR7
8
TR9
R13
TR4
R6
C1
1
TR1
2
TR3
R2
TR2
R3
R4
D1
SUB
R5
13
TR5
TR6
TR8
R7
1256710
TR10
11
R8
TR12
TR13
R9
TR11
R10
C2
R11
R12
TR14 TR15
TR16
R14
9
14
15
1-46
Page 47
TDA7439 (IC436) : Control volume
1.Pin layout
1
SDA
2
CRE
3
Vs
4
AGND
5
ROUT
6
LOUT
7
R-IN4
8
R-IN3
9
R-IN2
10
R-IN1
11
L-IN1
12
L-IN2
13
L-IN3
14
L-IN4
MUXOUTL
15
2.Block diagram
TDA7439
30
CSL
29
DIG GND
28
TREBLE(R)
27
TREBLE(L)
26
MIN(L)
25
MOUT(L)
24
BOUT(L)
23
BIN(L)
22
BOUT(R)
21
BIN(R)
20
MOUT(R)
19
MIN(R)
18
INR
17
MUXOUTR
16
INL
MX-GT90
L-IN1
L-IN2
L-IN3
L-IN4
R-IN1
R-IN2
R-IN3
R-IN4
11
12
13
14
10
BIN(L)
24
BASS
BASS
2221
BOUT(L)
SPEAKER
ATT
LEFT
SPEAKER
ATT
RIGHT
SUPPLY
2
6
30
1
29
5
3
4
SCL
AGND
LOUT
SDA
DIG-GND
ROUT
Vs
26
MIDLE
MIN(L)
25
MOT(L)
23
G
0/30dB
2dB STEP
INL
MUXOUT
15 16 27
VOLUME
2
I C BUS DECODER LATCHES
TREBLE
TREBLE(L)
9
G
VOLUME
TREBLE
MIDLE
8
7
INPUT
MULTIPLEXER
GAIN
17
18
201928
INR
CREF
MUXOUT
TREBLE(R)
MIN(R)
BIN(R)
MOUT(R)
BOUT(R)
1-47
Page 48
MX-GT90
UPD780024AGKB25 (IC251) : Unit micom
1. Pin layout
P47/AD7
P46/AD6
P45/AD5
P44/AD4
P43/AD3
P42/AD2
P41/AD1
P40/AD0
P67/ASTB
P66/WAIT
P65/WR
P64/RD
P75/BUZ
P74/PCL
P73/TI51/TO51
P72/TI50/TO50
P50/A8
P51/A9
P52/A10
P53/A11
P54/A12
P55/A13
P56/A14
P57/A15
Vss
V
DD0
P30
P31
P32
P33
P34/SI31
P35/SO31
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
1
2
3
4
5
6
7
8
0
9
10
11
12
13
14
15
16
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
P71/TI01
P70/TI00/TO0
P03/INTP3/ADTRG
P02/INTP2
P01/INTP1
P00/INTP0
Vss
1
X1
X2
IC
XT1
XT2
RESET
AV
DD
AV
REF
P10/ANI0
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
P20/SI30
P36/SCK31
P21/SO30
P22/SCK30
1-48
P24/TxD0
P23/RxD0
P25/ASCK0
1
DD
V
AVss
P17/ANI7
P16/ANI6
P15/ANI5
P14/ANI4
P13/ANI3
P12/ANI2
P11/ANI1
Page 49
2. Block diagram
MX-GT90
T100/TO0/P70
TI01/P71
TI50/TO50/P72
TI51/TO51/P73
SI30/P20
SO30/P21
SCK30/P22
SI31/P34
SO31/P35
SCK31/P36
RxD0/P23
TxD1/P24
ASCK0/P25
ANO0/P10 to ANI7/P17
DD
AV
AVss
REF
AV
INTP0/P00 to INTP3/P03
BUZ/P75
PCL/P74
16bit Timer/
event counter
8bit Timer/
event counter 50
8bit Timer/
event counter 51
Watchdog timer
Watch timer
Serial
interface30
Serial
interface31
UART0
A/D
converter
Interruput
control
Buzzer output
Clock output
control
78K/0
CPU core
RAM
1024 Bytes
DD0 VDD1
V
ROM
32k Bytes
Vss0 Vss1 IC
Port 0
Port 1
Port 2
Port 3
Port 4
Port 5
Port 6
Port 7
EXTERNAL
ACCESS
System control
P00 to P03
P10 to P17
P20 to P25
P30 to P36
P40 to P47
P50 to P57
P64 to P67
P70 to P75
AD0/P40 to AD7/P47
A8P50 to A15/P57
RD/P64
WR/P65
WAIT/P66
ASTB/P67
RESET
X1
X2
XT1
XT2
1-49
Page 50
MX-GT90
3.Pin Functions
Pin Name
P00 to P02
P03
P10 to P17
P20
P21
P22
P23
P24
P25
P30
P31
P32
P33
P34
P35
P36
P40 to P47
P50 to 57
P64
P65
P66
P67
P70
P71
P72
P73
P74
P75
I/O
I/O
Input
I/O
I/O
I/O
I/O
I/O
I/O
Alternate
Function
INTP0 to
INTP2
INTP3/ADTRG
ANI0 to ANI7
SI30
SO30
SCK30
RxD0
TxD0
ASCK0
-
SI31
SO31
SCK31
AD0 TO AD7
A8 to A15
RD
WR
WAIT
ASTB
TI00/TO0
TI01
TI50/TO50
TI51/TO51
PCL
BUZ
Function
Port 0
4-bit I/O port
Input /output can be specified in 1-bit units.
An on-chip pull-up resistor can be connected by means of software.
Port 1
8-bit input-only port
Port 2
6-bit I/O port
Input /output can be specified in 1-bit units.
An on-chip pull-up resistor can be connected by means of software.
Port 3 (P3)
7-bit I/O port
Input /output can be
specified in 1-bit units.
Port 4
8-bit I/O port
Input /output can be specified in 1-bit units.
An on-chip pull-up resistor can be connected by means of software.
Interrupt request flag (KRIF) is set to 1 by falling edge detection.
Port 5 (P5)
8-bit I/O port
LEDs can be driven directly.
Input /output can be specified in 1-bit units.
An on-chip pull-up resistor can be connected by means of software.
Port 6
4-bit I/O port
Input /output can be specified in 1-bit units.
An on-chip pull-up resistor can be connected by means of software.
Port 7
6-bit I/O port
Input /output can be specified in 1-bit units.
An on-chip pull-up resistor can be connected by means of software.
N-ch open-drain input/output port
An on-chip pull-up resistor can be
specified by the mask option.
LEDs can be driven directly.
An on-chip pull-up resistor can be
connected by means of software.
After
Resist
Input
Input
Input
Input
Input
Input
Input
Input
1-50
Page 51
MX-GT90
VICTOR COMPANY OF JAPAN, LIMITED
AUDIO & COMMUNICATION BUSINESS DIVISION
PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
(No.20996)
200106(V)
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