JVC MX-GT88 Schematic

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MX-GT88

MX-GT88

B ------------------------ U.K.
E ---- Continental Europe
EN ----- Northern Europe
EV ------- Eastern Europe

CD

3

2

CD

CD

1

Area suffix

STANDBY

ECO

COMPACT COMPONENT SYSTEM MX-GT88

REC START

K

OC

R

/ STOP

CD REC

POP

START

DUBBING

CLASSIC

DISPLAY

MP3

PHONES

SOUND
TURBO

SUBWOOFER LEVEL

U

L

M

O

E

V

M

D

O

N

U

D

E

O

S

TUNING

BEEP

DISC CHANGE

REPEAT

DANCE

PROGRAM

HA

LL

RANDOM

STADIUM

CLOCK
/ TIMER

SET

PRESET

CANCEL
/ DEMO

TAPE A / B

SELECT

DISPLAY MODE

RDS MODE

TUNING

EJECTEJECT

SP-MXGT88 SP-MXGT88CA-MXGT88

Contents

Safety Precautions
Important for laser produbts
Preventing static electricity
Disassembly method
Wiring connection
Adjustment method

COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD.

1-2
1-4
1-5
1-6
1-19
1-20

Flow of functional operation
until TOC read
Maintenance of laser pickup
Replacement of laser pickup
Trouble shooting
Description of major ICs

1-24
1-25
1-25
1-26
1-30~44

No.22075

Jul. 2003

MX-GT88

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 par ts which
have these special safety characteristics are identified in the Parts List of Service Manual. Electrical
components having such features are identified by shading on the schematics and by ( ) on the Parts List in
the Service Manual. The use of a substitute replacement which does not have the same safety characteristics
as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or
other hazards.

4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be
separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of
electric shock and fire hazard. When service is required, the original lead routing and dress should be
observed, and it should be confirmed that they have been returned to normal, after re-assembling.

5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed metal parts of the product
(antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the
product is safe to operate without danger of electrical shock.
Do not use a line isolation transformer during this check.

Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage
current from each exposed metal parts of the cabinet, particularly any exposed metal part having a return
path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).

Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more
sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor
between an exposed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal part,
particularly any exposed metal part having a return path to
the chassis, and meausre the AC voltage across the resistor.
Now, reverse the plug in the AC outlet 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 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.

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.

(This regulation does not correspond to J and C version.)

1-2

MX-GT88

(U.K only)

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.

2. Any unauthorised design alterations or additions will void the manufacturer's guarantee ; further more the
manufacturer cannot accept responsibility f or personal injury or property damage resulting therefrom.

3. Essential safety critical components are identified by ( ) on the Parts List and by shading on the
schematics, and must never be replaced by parts other than those listed in the manual. Please note

however that many electrical and mechanical parts in the product have special safety related
characteristics. These characteristics are often not evident from visual inspection. Parts other than
specified by the manufacturer may not have the same safety characteristics as the recommended
replacement parts shown in the Parts List of the Service Manual and 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 or iginal lead
routing and dress should be observed, and it should be confirmed that they have been returned
to normal, after re-assembling.

1. Service should be performed by qualified personnel only.

2. This equipment has been designed and manufactured to meet international safety standards.

3. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.

4. Repairs must be made in accordance with the relevant safety standards.

5. It is essential that safety critical components are replaced by approved parts.

6. 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.

1-3

MX-GT88

Important for laser products

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter

lock failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the
Laser Unit. Do not disassemble the Laser Unit. Replace
the complete Laser Unit if it malfunctions.

4.CAUTION : The compact disc player uses invisible
laserradiation and is equipped with safety switches
whichprevent emission of radiation when the drawer is
open and the safety interlocks have failed or are de
feated. It is dangerous to defeat the safety switches.

5.CAUTION : If safety switches malfunction, the laser is able
to function.

6.CAUTION : Use of controls, adjustments or performance of
procedures other than those specified herein may result in
hazardous radiation exposure.

CAUTION

!

REPRODUCTION AND POSITION OF LABELS

Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.

CLASS 1
LASER PRODUCT

WARNING LABEL

1-4

Preventing static electricity

MX-GT88

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 CD mechanism assembly is decomposed

*Please refer to "Disassembly method" in the text for pick-up and how to
detach the CD mechanism assembly.

1. Remove the CD changer unit.

2. Remove the CD changer mechanism.

3. Solder is put up before the card wire is removed from the pickup unit
connector on the CD mechanism assembly.
(When the card wire is removed without putting up solder, the CD pick-up
assembly might destroy.)

4. Please remove solder after connecting the card wire with the pickup unit
connector when you install picking up in the substrate.

Card wire

Picup unit
connector

Soldering

Fig.2

CD changer unit

Fig.1

Card wire

Picup unit
connector

CD changer
mechanism

1-5

MX-GT88

Disassembly method

Removing the metal cover (See Fig.1)

1.

Remove the three screws A attaching the metal
cover on the back of the body.

2.

Remove the six screws B attaching the metal cover
on both sides of the body.

3.

Remove the metal cover from the body by lifting the
rear part of the cover.

ONE POINT

How to eject the CD tray manually
(see fig.2)

Turn the loading pulley gear at the bottom of
the CD changer unit as shown in Fig.2 and
draw the CD tray toward the front.

Metal cover

A

B

(both sides)

Fig.1

Loading pulley gear
(See <CD changer unit>fig.1)

Removing the CD tray fitting

(See Fig. 3)

Prior to performing the following procedure, eject the
CD tray.

After drawing the lower part of the tray fitting toward

1.
the front, remove the five claws. Then, while moving
the tray fitting upward, remove it.

Removing the CD changer unit

(See Fig.4 to 7)

Prior to performing the following procedure, remove
the metal cover and CD tray fitting.

1.

Remove the card wire attached to CD changer unit
on the adhesion tape.

2.

Disconnect the card wire from the connector CW105
on the CD board.

3.

Disconnect the harness from the connector CW104
on the main board.

4.

Remove the two screws C attaching the CD changer
unit to the rear panel.

Fig.2

Joint

CD tray fitting

Claw

Fig.3

Card wire

CD changer unit

5.

Remove the two screws D attaching the CD changer
unit to both sides of the front panel assembly.

6.

Draw the CD changer unit upward from behind while
pulling the rear panel outward.

1-6

Adhesion tape

Fig.4

MX-GT88

CW105

CD board

CD changer unit

CW104

Main board

Fig.5

Removing the front panel assembly

(See Fig.8 to 10)

Prior to performing the following procedure, remove
the metal cover and CD changer unit.

Front panel

assembly

D

(both sides)

Front panel

assembly

Fig.6

CD changer unit

Fig.7

CW101

CW109

CW110

C

Rear panel

Rear panel

Main board

ACW1

ACW2

CW108

1.

Disconnect the card wire from the connector CW101
on the main board.

2.

Disconnect the harness from the connector CW108,
CW109 and CW110 on the main board.

3.

Remove the screw E fixiing the lug wire.

4.

Remove the two screws F attaching the front panel
assembly to both sides of the body.

5.

Remove the screw G attaching the main board to the
front panel assembly.

6.

Remove the screw H attaching the front panel
assembly to bottom of the body.

7.

Release the two joints1 and two joints2, and detach
the front panel assembly toward the front.

Joint1
(both sides)

(both sides)

F

Fig.8

Main board

Fig.9

E

(fixing the lug wire)

F

(both sides)

Amp. board

Front panel
assembly

G

Joint1
(both sides)

1-7

MX-GT88

)

Removing the heat sink & amp. board

(See Fig.8, 11 and 12)

Prior to performing the following procedure, remove
the metal cover and CD changer unit.

1.

Disconnect the card wire from the connector ACW1
and the harness from the connector ACW2 on the
amp. board.

2.

Remove the four screws I attaching the heat sink
cover to the rear panel. Remove the heat sink cover.

3.

Remove the four screws J attaching the heat sink
and two screws K attaching the speaker terminal to
the rear panel.

4.

After moving the heat sink upward, remove the
claws. Then pull out the heat sink & amp. board
inward.

Heat sink

cover

H

Joint2

Fig.10

(Bottom side

Rear panel

I

I

Removing the tuner board
(See Fig.12 and 13)

Prior to performing the following procedure, remove
the metal cover.

1.

Disconnect the card wire from the connector CON01
on the tuner board.

2.

Remove the two screws L attaching the tuner board
to the rear panel.

Removing the rear panel (See Fig.12)

Prior to performing the following procedure, remove
the metal cover, CD changer unit, heat sink & amp.
board and tuner board.

1.

Remove the three screws M and three screws N
attaching the rear panel.

J

Claws

Heat sink

J

N

Main board

Fig.11

Rear panel

L
K

Speaker
terminal

M

Fig.12

CON01

Rear panel

1-8

Tuner board

Fig.13

MX-GT88

3

Removing the main board (See Fig. 14)

Prior to performing the following procedure, remove
the metal cover, CD changer unit and rear panel.

1.

Disconnect the card wire from the connector CW101,
and the harness from the connector CW108,
CW109, CW110 and CW11, and the power cord
from the connector PW103 on the main board.

2.

Disconnect the harness from the connector PCW1
on the fuse board.

3.

Remove the screw G attaching the main board to the
front panel assembly. (See Fig.9)

4.

Remove the two screws O attaching the heat sink to
the bottom chassis.

Removing the power cord (See Fig. 14)

Prior to performing the following procedure, remove
the metal cover, CD changer unit and rear panel.

CW108

Fuse board

PCW1

PW102

Bottom chassis

Power supply board

Power ICs solder point

CW101

CW109

CW110

Main board

Heat sink

PW10

CW11

O

Power cord

Power cord stopper

Fig.14

Heat sink

1.

Disconnect the power cord from the connector
PW103 on the main board and pull up the power
cord stopper upward.

Removing the power ICs

(See Fig.15 and 16)

Prior to performing the following procedure, remove
the metal cover, CD changer unit and heat sink &
amp. board.

1.

Unsolder the power ICs solder points.

2.

Remove the four screws P attaching the power ICs
to the heat sink.

Removing the power transformer

(See Fig .17)

Prior to performing the following procedure, remove
the metal cover, CD changer unit and heat sink &
amp. board.

1.

Disconnect the harness from the connector PW102
on the power supply board.

Fig.15

Fig.16

Power transformer

P

Amp. board
(reverse side)

Heat sink

Amp. board

Fuse board

PCW1

2.

Disconnect the harness from the connector PCW1 on
the fuse board.

3.

Remove the four screws Q attaching the power
transformer on the bottom chassis.

Bottom

chassis

Q

Power supply board

PW102

Fig.17

1-9

MX-GT88

<Front panel assembly>

Prior to performing the following procedure, remove
the front panel assembly.

Removing the CD switch board (See Fig.1)

1.

Disconnect the card wire from the connector UCW03
on the CD switch board.

2.

Remove the five screws A attaching the CD switch
board.

Removing the front board
(See Fig.1 and 2)

1.

Pull out the sound mode knob, volume knob, and
preset knob from the front side of front panel
assembly.

2.

Disconnect the card wire from the connector UCW02
on the front board and the connector on the mecha.
board.

3.

Remove the fifteen screws B attaching the front
board.

B

B

Connector

Mecha.

board

Front panel assembly (inner side)

A

Fig.1

CD switch board

UCW03

Front board

UCW02
UCW01

4.

Disconnect the card wire from the connector UCW01
on the front board.

Removing the headphone jack board
(See Fig.3)

Prior to performing the following procedure remove
the front board.

1.

You can pull out the headphone jack board.

Removing the cassette mechanism
assembly (See Fig.3)

1.

Disconnect the card wire from the connector on the
mecha. board.

2.

Remove the six screws C attaching the cassette
mechanism assembly.

Connector

C

Mecha.

board

Sound mode knob
Volume knob

Preset knob

Fig.2

Front panel assembly (inner side)

Headphone

jack board

C

1-10

C

(fixing the lug wire)

Fig.3

Cassette mechanism

assembly

MX-GT88

<CD changer unit>

Prior to performing the following procedure, remove
the CD changer unit.

Removing the CD tray (See Fig.1 and 2)

1.

Turn the black loading pulley gear on the under side
of the CD changer unit in the direction of the arrow
and draw the CD tray toward the front until it stops.

2.

Disconnect the card wire from connector CW103 on
the CD board.

3.

Push down the two tray stoppers marked a and pull
out the CD tray.

Loading pulley

gear

CD changer uint (reverse side)

CD tray

CD board

CW103

Fig.1

a (Tray stopper)

Reinstall the CD tray (See Fig.3 and 4)

1.

Align the gear-cam with the gear-tray as shown fig.3,
then mount the CD tray.

2.

When assembling the CD tray, take extreme care not
engage with gear - synchro.

Gear-cam

Gear-convert

Gear-cam

timing point

CD tray

a

(Tray stopper)

CW103
(on the CD board)

Fig.2

Gear-tray

Gear-synchro

Gear-convert

Gear-tray

CD tray

Gear-tray

Fig.3 Fig.4

1-11

MX-GT88

Removing the sensor board (See Fig.5)

Prior to performing the following procedure, remove
the CD tray.

1.

Remove the screw A attaching the sensor board on
the CD tray.

2.

Remove the sensor board releasing the two tabs a.

3.

Disconnect the harness from the connector CW1 on
the sensor board.

Removing the turn tray motor
(See Fig.6 and 7)

Prior to performing the following procedure, remove
the CD tray and sensor board.

1.

Remove the screw B attaching the turn tray. Detach
the turn tray from the base tray.

2.

Pull outward the tab b attaching the turn tray motor
on the base tray and detach the turn tray motor.

CD tray (reverse side)

A

CW1

Tab a

Sensor board

Fig.5

Turn tray

Introductory notes:
Base tray + Turn tray = CD tray

Base tray

B

Fig.6

Turn tray motor

Base tray (upper side)

Tab b

Fig.7

1-12

Removing the belt, the CD board and the
switch board (See Fig.8 and 9)

Prior to performing the following procedure, remove
the CD tray.

1.

Detach the belt from the pulley on the upper side of
the CD changer unit (Do not stain the belt with
grease).

2.

Disconnect the card wire from the pickup unit
connector on the under side of the CD changer unit.

Attention : Solder is put up before the card wire is
removed from the pick-up unit
connector on the CD mechanism
assembly.
(When the card wire is removed without
putting up solder, the CD pick-up unit
assembly might destroy.)

3.

Disconnect the motor wire harness from connector
on the CD board.

4.

Remove the screw C attaching the switch board and
release the two tabs e attaching the switch board
outward and detach the switch board.

5.

Remove the two screws D attaching the CD board.
First release the two tabs f and two tabs g attaching
the motor, then release the CD board.

If the tabs f and g are hard to release, it is
recommendable to unsolder the two soldered parts
on the motor terminal of the CD board.

Tabs e

C

Switch board

CW3

CD changer unit

Fig.8

CD board

D

Tabs g

Soldered parts

CD mechanism board

motor connecter

Pickup unit connector

Card wire

MX-GT88

Belt

Motor

Tabs f

Soldering

Picup unit
connector

Fig.9

1-13

MX-GT88

Removing the CD mechanism holder
assembly (mechanism included)

(See Fig.10 to 13)

1.

Disconnect the harness from connector on the CD
mechanism board in the CD mechanism assembly
on the under side of the CD changer unit. Disconnect
the card wire from the pickup unit connector.

Attention : Solder is put up before the card wire is
removed from the pick-up unit
connector on the CD mechanism
assembly. (Refer to Fig.9)
(When the card wire is removed without
putting up solder, the CD pick-up unit
assembly might destroy.)

Motor connecter

CD changer unit

CD mechanism holder assembly

Pickup unit connector

2.

Remove the screw E attaching the shaft on the right
side of the CD mechanism holder assembly. Pull
outward the stopper fixing the shaft on the left side
and remove the CD mechanism holder assembly
from behind in the direction of the arrow y.

3.

Turn the CD mechanism holder assembly half
around the lift up slide shaft h of the CD mechanism
holder assembly until the turn table is reversed, and
pull out the CD mechanism holder assembly.

Lift up slide shaft

Fig.10

E

Stopper

CD mechanism holder assembly

Fig.11

Lift up slide shaft n

1-14

CD mechanism holder assembly

Fig.13

y

CD mechanism holder assembly

Fig.12

MX-GT88

<CD mechanism section>

•

Removing the CD mechanism holder from the CD
chager unit.
(Refer to "Removing the CD mechanism holder
assembly" )

Removing the pickup unit (

1. Removing the cut washer on the feed gear
sleeve and pull out the feed gear.

2. Remove the two screws A fixing the pickup
shaft.

3. Removing the pickup unit.

Removing the motor board

1. Unsolder the motor terminal on the motor board.

2. Remove the moter board.

Removing the feed motor (

Remove the two motor fixing screws at B and
removing the feed motor.

See Fig.1)

(See Fig.2)

See Fig.1)

A

Motor board

Shutter

Cut washer

B

Fig.1

Unsolder

Pickup unit

Feed Gear

Feed motor

Shaft

A

Removing the spindle motor

The spindle motor cannot be removed as a single
unit.
When removing the spindle motor, change the chasis
and turntable together as aunit.

Spindle motor

Unsolder

Fig.2

1-15

MX-GT88

<Cassette mechanism section>

Prior to performing the following procedure, remove
the

cassette mechanism assembly.

Removing the R/P head.
(See Fig.1 and 2)

1.

Remove the screw A on the right side of the R/P
head.

2.

Remove the screw B on the left side of the R/P
head.

Remove the erase head.

1.

Remove the screw C fixing the erase head.

(See Fig.1)

E. Head

R/P Head

C

B

B

Pinch roller

A

Fig.1

A

Remove the pinch roller.

Pull out the pinch roller stopper.

1.
Pull out the pinch roller.

2.

(See Fig.3)

Spring

Pinch roller

R/P Head

Fig.2

Pinch roller

stopper

Fig.3

1-16

MX-GT88

Removing the motor

1.

Slide the plastic cover in the direction of the arrow,
and remove the three claws. Then remove the
plastic cover.

2.

Remove the two screws D fixing the motor.
Be careful to grease's splash when the drive belt
comes off.

3.

Unsolder the motor terminal.

(See Fig. 4 to 6)

Removing the mechanism board

1.

Unsolder the four solder parts a and the four solder
parts b.

2.

Remove the two screws E attaching the mecha.
board.

(See Fig. 5)

Removing the flywheel

1.

Remove the cut-washer at c from the capstan shaft,
then remove the flywheel.
When reassembling the flywheel, be sure to use new
washers as they cannot be reused.

(See Fig. 7 and 9)

Solder

part

D

Claw

Fig.4

Motor

b

terminal

Solder

part

a

Solder
part

E

a

Plastic cover

Mecha. board

E

Flywheel

Washer

FR belt

Fig.8

Sleeve

c

FR belt

Drive belt

Motor

Drive belt

Fig.5

Motor

Drive belt

Fig.6

Fig.9

Capstan

washer

Fig.7

1-17

MX-GT88

< Speaker section >

It is exchange in a unit.
Please do not decompose as much as possible.

Removing the duct (See Fig. 1)

1.

Remove the foru screws A and two screws B
attaching the duct, and remove the duct.

Duct

B

(both sides)

A

(both sides)

Fig.1

1-18

MX-GT88

Wiring connection

Amp. board

0

9

Front board

UCW02

AH39-00295A

3809-001413

ACW2

ACW1

CD switch board

3809-001228

UCW03

UCW04

UCW05

UCW01

9

Power transformer

0

PW102

PCW1

9

0

3809-001121

AH39-00338A

AH39-00466A

CD mechanism

AH39-20561P

CW2

AAN1

CW1

CW3

AH38-12001A

9

0

Color codes are shown below.
1 Brown
2 Red
3 Orange
4 Yellow
5 Green
6 Blue
7 Violet

0

9

8 Gray
9 White
0 Black

0

2

0

2

3809-001034

CW102

CW103

CW105

CW106

9

0

CD board

CW107

CW101

CW104

CW3

AH39-00060A

3809-001211

3809-001434

CON01

0

0

9

3809-001259

9

0

9

0

9

0

CW103

9

0

CW105

CW104

PW103

CW11

CW106

9

0

9

AH39-00247A

0

CW108

Main board

CW110

Tuner board

CW101

CW111

CW109

CW107

9

0

0

9

2

2

0

CW01B

9

0

Headphone J.board

9

AH39-00022A

0

9

2

0

88

9

9

0

9

2

0

AH39-20002D

8

2

8

2

1-19

MX-GT88

Adjustment method

1. Tuner

ITEAM

Received FREQ.
Adjustment

point

Output

* Adjustment Location of Tuner PCB

AM(MW) OSC
Adjustment

522~1629 KHz

MO

1~7.0 0.5V

MAIN
PCB

AM(MW) RF
Adjustment

594 KHz

MA

Maximum
Output(Fig.1)

VT GND

TESTER

1-20

Fig.1 OSC Voltage

FM THD Adjustment

MX-GT88

SSG FREQ.

98 MHz

Adjustment
point

FM DETECTOR COIL

(FM DET)

Output

60 dB

Minumum Distortion (0.4% below)
(Fig.2)

FM Search Level Adjustment

SSG FREQ.
Adjustment

point

(SVR1)

BEACON
SENSITIVITY
SEMI-VR(10K )

98 MHz

Output
GND

FM
Antenna
Terminal

SET

FM S.S.G

Speaker
Terminal

output

Distortion Meter

Fig.2 IF CENTER and THD Adjustment

28 dB

FM Antenna

Input

Oscilloscope

Input

SET

Output

28 dB(

2dB)

Adjust SVR1 (Fig.3)

*Adjust FM S.S.G level to 28dB

AM(MW) I.F Adjustment

SSG FREQ.
Frequency

450 kHz
522 kHz

Adjustment
point

AM IF

Maximum output (Fig.4)

FM S.S.G

GND

FM IN

Fig.3 FM Auto Search Level Adjustment

60cm

OUTPUT

AM SSG
450KHZ

AM ANT
IN

20 k

AM IF

Speaker Terminal

INPUT

VTVM Oscilloscope

OUTPUT

Fig.4 AM I.F Adjustment

1-21

MX-GT88

2. Cassette Deck

To adjust tape speed

Notes

1) Measuring tape:
i) VT-712/MTT-111(or equivalent)
(Tapes recorded with 3kHz)
ii) AC-225/MTT-5512(or equivalent)

2) Connect the cassette deck to the frequency counter
as in fig.1.

Cassette Deck

SPK OUT

Frequency Counter

output

Fig.1

Pre-Setup
Condition

NOR

1 3KHz

SPEED
Control

SPK OUT
(connected to the
frequency counter)

1) Deck 1:VT-712

2) Press PLAY
SW button

To Adjust

Turn VSR1 to
left and right
(FRONT PCB)

3) Deck 2:Same
as above

To adjust plabyback level/REC

Notes

1) Before the actual adjustment, clean the play/recording head.

2) Measuring tape :
i) VT-703/MTT-114N(or equivalent 10kHz AZIMUTH control)

ii) AC-225/MTT-5512(or equivalent)

3) The cassette deck is connections as shown in fig.2.

MAIN PCB

SPK OUT

(GND)

Fig.2

VTVM

In Out

RemarkStandardPre-SetupItemStep

1%

range

Oscilloscope

1. Adjust Deck 1 Play Level

Pre-Setup
Condition

AZIMUTH1 SPK OUT

(VTVM is
connected to
the scope)

1-22

After putting VT-703
into Deck 1

- Press FWD PLAY
button.

To Adjust

Turn the control
screw to as
shownin Fig.3.

Max output
and same phase
(both channels)

RemarkStandardPre-SetupItemStep

After
adjustment
secure it with
REGION
LOCK.

2. Adjust Deck 2 Play Level/REC BIAS

MX-GT88

2

AZIMUTH1

Recording
Bias
Voltage

Pre-Setup
Condition

SPK OUT
(VTVM is
connected to
the scope)

Fig.4

Recording /Play head

AZIMUTH control screw
(FWD Play)

After putting VT-703
into Deck 2

1)Press FWD PLAY
button.

After putting AC-225
into Deck 2

1)Press REC PLAY
button.

2)TAPE PCB JCW3,
connectted to VTVM

To Adjust

Turn the control
screw to as
shown in Fig.3.

Turn JSR2L,
JSR2R to the
right and left

Max output
and same phase
(both channels)

CHECK TO
7mV(

0.5mV)

RemarkStandardPre-SetupItemStep

After
adjustment
secure it with
REGION
LOCK.

AZIMUTH control screw
(RVS Play)

Audio OSC.

Fig.3

AUX IN

SET
(MAIN PCB)

IN

TP

SPK OUT

Fig.4

VTVM

IN OUT

Oscilloscope

1-23

MX-GT88

Flow of functional operation until TOC read

Power ON

Play Key

RESET a CD LSI

Check Point

Confirm that the voltage at the pin17
of KB9226(IC101) is "L" "H".

LIMIT SW ON

SET Default value of
TE gain, TE balance

Automatic adjusting of

focus bias

Automatic adjusting of

FE offset

Automatic adjusting of

TE offset

LASER power ON

Detection of disk

Confirm that the voltage at the pin33
of KB9226(IC101) is "H" "L" "H".

Confirm that the voltage at the
pin37 of KB9226(IC101) is 3.5V.

Tracking error waveform at TOC reading

Pin 34 of
KB9226
(IC101)

Approx

0.4V

2.50V

Disc states
to rotate

Approx.3.7sec

Disc is rotated

Automatic adjusting of

TE balance

Automatic adjusting of

TE gain

TOC reading

Play a disc

Confirm that the signal from pin24
of KB9226(IC101) is 3.5V as a
accelerated pulse during
approx.1.96s.

Confirm the waveform of
the Tracking error signal
at the pin 34 of KB9226(IC101).

Confirm the eye-pattern
at the pin2 of KB9226(IC101).

1-24

Maintenance of laser pickup

MX-GT88

(1) Cleaning the pick up lens
Before you replace the pick up, please try to
clean the lens with a alcohol soaked cotton
swab.

(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.

(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 :
amplitude of eye pattern) will below.

Is the level of

RF OUT under

1.1V 0.2Vp-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.

1-25

MX-GT88

Troubleshooting

1. Amplifier

Power malfunction

No output

1-26

2.Tuner malfunction (FM/AM)

MX-GT88

3.Tape

1-27

MX-GT88

4.CD

1-28

5.CD - MP3 parts

MX-GT88

1-29

MX-GT88

Description of major ICs

LC876764 (UIC1) : Microcontroller

1.Pin layout

S47/PF7

S46/PF6

S45/PF5

S44/PF4

S43/PF3

S42/PF2

S41/PF1

S40/PF0

VDD4

S39/PE7

S38/PE6

S37/PE5

S36/PE4

S35/PE3

S34/PE2

S33/PE1

S32/PE0

S31/PD7

S30/PD6

S29/PD5

S28/PD4

S27/PD3

S26/PD2

S25/PD1

S24/PD0

S23/PC7

S22/PC6

S21/PC5

S20/PC4

FIX0

2.Block diagram

8079787776757473727170696867666564636261605958575655545352

P00
P01
P02
P03

P04
P05
P06
P07

81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100

1234567891011121314151617181920212223242526272829

CF1

RES

VSS1

XT1/AN10

P16/T1PWML

P30/INT4/T1IN

P31/INT4/T1IN

P32/INT4/T1IN

P33/INT4/T1IN

P17/T1PWMH/BUZ

P34/INT5/T1IN

P35/INT5/T1IN

XT2/AN11

P36/INT5/T1IN

P37/INT5/T1IN

IR PLA

S48/PG0
S49/PG1
S50/PG2
S51/PG3

VSS2
VDD2

P10/SO0

P11/SI0/SB0

P12/SCK0

P13/SO1

P14/SI1/SB1

P15/SCK1

Interrupt Control

Stand-by Control ROM

CF2

VDD1

P80/AN0

P81/AN1

P82/AN2

P83/AN3

P84/AN4

P85/AN5

P86/AN6

P87/AN7/MICIN

51

S19/PC3

50

S18/PC2

49

S17/PC1

48

S16/PC0

47

VDD3

46

S15/T15

45

S14/T14

44

S13/T13

43

S12/T12

42

S11/T11

41

S10/T10

40

S9/T9

39

S8/T8

38

S7/T7

37

S6/T6

36

S5/T5

35

S4/T4

34

S3/T3

33

S2/T2

32

S1/T1

31

30

S0/T0

P73/INT3/T0IN/AN13

P70/INT0/T0LCP/AN8

P71/INT1/T0HCP/AN9

P72/INT2/T0IN/NKIN/AN12

SIO0

SIO1

Timer 0

(High speed clock counter)

Timer 1

Base Timer

VFD Controller

INT 0 - 5

Noise Rejection

CF
RC

MRC

X’ tal

Clock

Generator

Bus Interface

Port 0

Port 1

Port 3

Port 7

Port 8

ADC

Weak Signal

Detector

PC

ACC

B Register

C Register

ALU

PSW

RAR

RAM

1-30

Timer 4

Timer 5

Timer 6

Timer 7

Stack Pointer

Watch Dog Timer

MX-GT88

3. Pin function (1/2)

Pin name

VSS1, 2
VDD1,2,3,4
FIX0

PORT0
P00 to P07

PORT1
P10 to P17

PORT3
P30 to P37

PORT7
P70 to P73

PORT8
P80 to P87

S0/T0 to
S8/T8
S9/T9 to
S15/T15
S16 to S23

S24 to S31

-

-

-

I/O

I/O

I/O

I/O

I/O

O

O

I/O

I/O

Power supply (-)
Power supply (+)
Test pin
Set as VSS with the user’s option. (see Note 1)

• 8bit input/output port

• Data direction programmable in nibble units

• Use of pull-up resistor can be specified in nibble units

• Input for HOLD release

• Input for port 0 interrupt

• 15V withstand at N-channel open drain output

• 8bit input/output port

• Data direction programmable for each bit

• Use of pull-up resistor can be specified for each bit

• Other pin functions
P10: SIO0 data output
P11: SIO0 data input / bus input / output
P12: SIO0 clock input / output
P13: SIO1 data output
P14: SIO1 data input / bus input / output
P15: SIO1 clock input / output
P16: Timer 1 PWML output
P17: Timer 1 PWMH output / Buzzer output

• 8bit input/output port

• Data direction can be specified for each bit

• Use of pull-up resistor can be specified for each bit

• 15V withstand at N-channel open drain output

• Other functions:
P30 to P33: INT4 input / HOLD release input / Timer 1 event input / Timer 0L
capture input / Timer 0H capture input
P34 to P37: INT5 input / HOLD release input / Timer 1 event input / Timer 0L
capture input / Timer 0H capture input

• 4bit input/output port

• Data direction can be specified for each bit

• Use of pull-up resistor can be specified for each bit

• Other functions
P70: INT0 input / HOLD release input / Timer0L capture input / Output for watchdog timer
P71: INT1 input / HOLD release input / Timer0H capture input
P72: INT2 input / HOLD release input / Timer 0 event input / Timer0L capture input
/ High speed clock counter input
P73: INT3 input(noise rejection filter attached input) / Timer 0 event input
/ Timer 0H capture input
AD input port: AN8(P70), AN9(P71), AN12(P72), AN13(P73)

• 8bit input/output port

• Input/output can be specified in a bit unit

• Other functions:
AD input port: AN0 to AN7
Weak signal detector input port: MICIN(P87)

• Large current output for VFD display controller digit (can be used for segment)

• Large current output for VFD display controller segment/digit

• Output for VFD display controller segment/digit

• Other functions:
High voltage input port: PC0 to PC7

• Output for VFD display controller segment

• Other functions:
High voltage input port: PD0 to PD7

Function I/O

1-31

MX-GT88

3. Pin function (2/2)

Pin name

S32 to S39

S40 to S47

S48 to S51

RES

XT1

XT2

CF1
CF2

I/O

I/O

I/O

I
I

I/O

I

O

Function I/O

• Output for VFD display controller segment

• Other functions
High voltage input port: PE0 to PE7

• Output for VFD display controller segment

• Other functions:
High voltage input/output port: PF0 to PF7

• Output for VFD display controller segment

• Other functions:
High voltage input/output port: PG0 to PG3
Reset terminal

• Input for 32.768kHz crystal oscillation

• Other functions:
General purpose input port
When not in use, connect to VDD1.
AD input port: AN10

• Output for 32.768kHz crystal oscillation

• Other functions:
General purpose input port
When not in use, set to oscillation mode and leave open circuit.
AD input port: AN11
Input terminal for ceramic oscillator
Output terminal for ceramic oscillator

KA9258D (IC301) : 4-ch Motor driver

1.Block diagram

28 27 26 25 24 23 22 21 20 19 18 17 16 15

10K

T • S • D

+-

LEVEL SHIFT

VCC VCC

10K

REGULATOR

10K

10K

GND

10K

10K

10K

50K

MUTE

LEVEL SHIFT

-+

1-32

10K

1 2 3 4 5 6 7 8 9 10 11 12 13 14

GND

HA12237 (JIC01) : Audio signal processor

1. Block diagram

TEST

(Open for normal use)

IREF

GND

ALCDET

20

19

18

17

Vcc

16

A

MUTE ON/OFF

REC MUTE OFF/ON

15

14

(REC RETURN ON/OFF)

A/B
13

ALC ON/OFF

High/Normal

11

12

MX-GT88

REC OUT(L)

NC

ALC(L)

REC IN(L)

NC

PB OUT(L)

TAI(L)

EQOUT(L)

PB-EQ(L)

PB-NF2(L)

21

22

23

24

2526

27

28

29

30

EQ

120/60

(Norm/High)

+

31

MUTE

AB

32

33

34

Return SW

35

ALC

Return SW

36

37

38

MUTE

AB

39

EQ

120/60

(Norm/High)

+

40

REC OUT(R)

10

9

NC

8

ALC(R)

7

REC IN(R)

6

NC

5

PB OUT(R)

4

TAI(R)

3

EQOUT(R)

2

PB-EQ(R)

1

PB-NF2(R)

2. Pin function

Pin No.

1
2
3
4
5
6
7
8

9
10
11
12
13
14

Symbol
PB-NF2(R)
PB-EQ(R)
EQOUT(R)
TAI(R)
PBOUT(R)
NC
RECIN(R)

NC
RECOUT(R)
ALC ON/OFF
High/Norm
A/B
MUTE ON/OFF

PB-NF1(L)

Function
PB EQ feed back
NAB output
EQ output
Tape input
PB output
NC pin
REC-EQ input

NC pin
REC output
Mode control input
Mode control input
Mode control input
Mode control input

AIN(L)

Pin No.

RIP

15

16
17
18
19

20
21
22
23
24
25
26

REC

IN(L)

Symbol
REC MUTE
OFF/ON
Vcc

GND
IREF

Test mode
RECOUT(L)
NC

RECIN(L)
NC
PBOUT(L)

GND

Return

Function
Mode control input

Vcc pin

GND pin
Equalizer reference
current input
Test mode pin
REC output
NC pin

REC-EQ input
NC pin
PB output

IN(R)

NC

AIN(R)

Pin No.

27
28
29
30
31
32
33
34
35
36
37
38
39
40

PB-NF1(R)

Symbol
TAI(L)
EQOUT(L)
PB-EQ(L)
PB-NF2(L)
PB-NF(L)
AIN(L)
RIP
BIN(L)
REC-RETURN
GND
BIN(R)
NC
AIN(R)
PB-NF1(R)

Function
Tape input
EQ output
NAB output
PB EQ feed back
PB EQ feed back
PB A deck input
Ripple filter
PB B deck input
REC Return
GND pin
PB B deck input
NC pin
PB A deck input
PB EQ feed back

1-33

MX-GT88

KB9226 (IC101) : RF amp. & servo signal processor

1. Pin layout

36 35 34 33 32 31 30 29 28 27 26 25

SLP

FEO

VCC

FEM

FRSH

TEO

FSET

TEM

FLB

FGD

2. Block diagram

37

LD
PD

38
39

PDAC

40

PDBD
PDF

41
42

PDE

43

DCB
MCP

44
45

DCCI

46

DCCO

47

VREF

48

EQC

LPFT

ATSC

RFO

RFM

1 2 3 4 5 6 7 8 9 10 11 12

TEIO

TZC/SSTOP

S1L9226X

EQO

EQI

GND

EFMI

FSI

SLO

SLM

SPO

SPM

ASY
EFM

LOCK

WDCK

CLVI

RESET

MLT

MDATA

MCK

ISTAT

TGU

24
23
22
21
20
19
18
17
16
15
14
13

EQO

EFMI

DCCI

DCC0

MCP

DCB

VCC/

VDD

FRSH

FSET

FLB

FGD

FSI

45
46
44
43

10

11

EQI

RFO

RFM

4

5

RF AGC & EQ

Control

Focus OK Detect

Defect Detect Mirror

Gen

Focus Servo Loop

- Gain & Phase
Compensation

- Focus Search

- Offset Adjust

- FZC Gen.

6
7
8
9

EQC

Center

Voltage

APC. Laser

Control &

LPC

Tracking Servo Loop

- Gain & Phase
Compensation

- Track Jump

- Offset Adjust

- TZC Gen.

Hardware Logic

- Auto-Sequencer

- Fast Search

- Febias, Focus Servo,
Tracking Offset ADJ.

VREF

Tracking Error

PDE

(RW)

I/V AMP

PDF

41 40424748123

PDBD

39

RF & Focus

Error (CD-RW)

I/V AMP

Sled Servo &

Kick Gen

PDAC

38
37

35
34

33
36

29
28

27
26
25

PD
LD

LPFT
TEIO

TZC&
SSTOP

ATSC

TEO
TEM

SLP
SLO
SLM

- Tracking Balance & Gain
Adjust

- Interruption Detect

29

FEO

- EFM Muting System
30

FEM

1-34

TGU

12

Micom Data Interface Logic Decoder

1413 15 16 17 19 18 20 22 21

ISTAT

MCK

MDATA

MLT

RESET

WDCK

CLVI

LOCK

EFM

Comparator

ASY

EFM

Spindle

Servo LPF

23

24

SPDLO

SPDLM

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
41
42
43
44
45
46
47

48

Symbol
RFM
RFO
EQI
EQO
EFMI
VCC
FRSH
FSET
FLB
FGD
FSI
TGU
ISTAT
MCK
MDATA
MLT
RESET
CLVI
WDCK
LOCK
EFM
ASY
SPM
SPO
SLM
SLO
SLP
TEM
TEO
FEM
FEO
GND
TZC/
SSTOP
TEIO
LPFT
ATSC
LD
PD
PDAC
PDBD
PDF
PDE
DCB
MCP
DCCI
DCCO
VREF
EQC

Function

I/O

RF summing amp. inverting input

I

RF summing amp. output

O

RFO DC eliminating input(use by MIRROR, FOK ,AGC & EQ terminal)

I

RF equalizer output

O

EFM slice input. (input impedance 47K)

I

Main power supply

P

Capcitor connection to focus search

I

Filter bias for focus,tracking,spindle

I

Capacitor connection to make focus loop rising band

I

Terminal to change the hign frequency gain of focus loop

I

Focus servo input

I

Connect the component to change the high frequency of tracking Loop

I

Internal status output

O

Micom clock

I

Data input

I

Data latch input

I

Reset input

I

Input the spindle control output from DSP

I

88.2KHz input terminal from DSP

I

Sled run away inhibit pin (L: sled off & tracking gain up)

I

EFM output for RFO slice(to DSP)

O

Auto asymmetry control input

I

Spindle amp. inverting input

I

Spindle amp. output

O

Sled servo inverting input

I

Sled servo output

O

Sled servo noninverting input

I

Tracking servo amp.inverting input

I

Tracking servo amp. output

O

Focus servo amp. inverting input

I

Focus servo amp. output pin

O

Main ground

P

Tracking zero crossing input & Check the position of pick-up wherther inside or not

I

Tracking error output & Tracking servo input

B

Tracking error integration input (to automatic control)

I

Anti-shock input

I

APC amp. output

O

APC amp. input

I

Photo diode A & C RF I/V amp. inverting input

I

Photo diode B & D RF I/V amp. inverting input

I

Photo diode F & tracking(F) I/V amp. inverting input

I

Photo diode E & tracking(E) I/V amp. inverting input

I

Capacitor connection to limit the defect detection

I

Capacitor connection to mirror hold

I

Output pin to connect the component for defect detect

O

Input pin to connect the component for defect detect

I

(VCC+GND)/2 Voltage reference output

O

AGC_equalize level control terminal & capacitor terminal to input in to VCA

I

MX-GT88

1-35

MX-GT88

5L9290 (IC201) : Digital signal processor for CDP

1. Pin layout

RCHOUT

VSSA_DAC

VREF

VHALF

VDDA_DAC

LRHOUT

VDDA_PLL

48 47 46 45 44 43 42 41 40 39 38 37

VSSD_DAC

VDDD_DAC

SADTI

LRCKI

BCKI

2. Block diagram

VSSA_PLL

VCO1LF

VSSD_PLL

VDDD_PLL

VDDD1_5V

XIN

XOUT

VSSD1_5V

EFMI

LOCK

SMEF

SMON

1

2

3

4

5

6

7

8

9

10

11

12

13 14 15 16 17 18 19 20 21 22 23 24

SMDS

WDCK

S5L9290X

DSP+DAC

48-LQFP-0707

LKFS

TESTV

LKFS

RESETB

MLT

MDAT

SOS1

SQCK

SBCK

SQDT
SBDT

MCK

ISTAT

C2PO

S0S1

SQCK

36

35

34

33

32

31

30

29

28

27

26

25

DATX

BCKO

LRCKO

SADTO

DATX

C2PO

JITB

SBCK

VDDD3-5V

VSSD2-3V

VDDD2-3V

MUTE

SQDT

VCO1LF

EFMI

LOCK
SMEF
SMDP
SMDS

WDCK

WFCK

RFCK

C4M

XIN

ISTAT

MLT

MDAT

MCK

MUTE

DPLL

CLV

Servo

Timing

Generator

Micom

Interface

Subcode

Out

EFM

Demodulator

ECC

16K

SRAM

Address

Generator

JITB

Interpolator

Interface

SADTO
LRCKO

BCKO

I/O

Digital

Out

SADTI
LRCKI

BCKI

Digital

Filter

1-bit

DAC

PWM

LPF

LCHOUT
RCHOUT

VHALF

VREF

1-36

3. Pin function

MX-GT88

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
28
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48

Symbol
VSSA_PLL
VCO1LF
VSSD_PLL
VDDD_PLL
VDDD1-5V
XIN
XOUT
VSSD1
EFMI
LOCK
SMEF
SMDP
SMDS
WDCK
TESTV
LKFS
C4M
RESETB
MLT
MDAT
MCK
ISTAT
S0S1
SQCK
SQDT
MUTE
VDDD2-3V
VSSD2
VDDD3-5V
SBCK
JITB
C2PO
DATX
SADTO
LRCKO
BCKO
BCKI
LRCKI
SADTI
VSSD_DAC
VDDD_DAC
RCHOUT
VSSA_DAC
VREF
VHALF
VDDA_DAC
LCHOUT
VDDA_PLL

I/O

-

O

-

-

­I

O

-

I
O
O
O
O
O

I
O
O

I

I

I

I
O
O

I
O

I

-

-

-

I
O
O
O
O
O
O

I

I

I

-

-

O

­O
O

­O

-

Function
Analog Ground for DPLL
Pump out for VCO1
Digital Ground Separated Bulk Bias for DPLL
Digital Power Separated Bulk Bias for DPLL (3V Power)
Digital Power (5V Power, I/O PAD)
X'tal oscillator input (16.9344MHz)
X'tal oscillator output
Digital Ground (I/O PAD)
EFM signal input
CLV Servo locking status output
LPF time constant control of the spindle servo error signal
Phase control output for Spindle Motor drive
Speed control output for Spindle Motor drive
Word clock output (Normal Speed : 88.2KHz, Double Speed : 176.4KHz)
Various Data/Clock Input
The Lock status output of frame sync

4.2336MHz clock output
System Reset at 'L'
Latch signal input from Micom
Serial data input from Micom
Serial data receiving clock input from Micom
The internal status output to Micom
Subcode sync signal(S0+S1) output
Subcode-Q data transfering bit clock input
Subcode-Q data serial output
System mute at 'H'
Digital Power (3V Power, Internal Logic)
Digital Ground (Internal Logic)
Digital Power (5V Power, I/O PAD)
Subcode data transfering bit clock
Internal SRAM jitter margin status output
C2 pointer output
Digital audio data output
Serial audio data output (48 slot, MSB first)
Channel clock output
Bit clock output
Bit clock input
Channel clock input
Serial audio data input (48 slot, MSB first)
Digital Ground for DAC
Digital Power for DAC (3V Power)
Right-Channel audio output through DAC
Analog Ground for DAC
Referance Voltage output for bypass
Referance Voltage output for bypass
Analog Power for DAC (3V Power)
Left-Channel audio output through DAC
Analog Power for PLL (3V Power)

1-37

MX-GT88

KS9274 (IC601) : CD-MP3 decoder

1.Block diagram

2.Pin function
5

6

10
14
15
20
21
22
24
25
26
27
35
36
37
38
39
44
45
46
47
50
51
52

53-62

63

CD-ROM Decoder MP3 Decoder

DRAM CONTROLLER

44-63 35-39

1M 4bits DRAM

CLK
RESETB
FILTER_0
FILTER_1
PLL_BYPASS
CD_DATA
CD_LRCK
CD_BCK
ACLK
BCLK
LRCK
ADAT
MDAT
MCK
MLAT
MDOUT
MINT
DDAT0
DDAT1
WEB
RASB
DDAT2
DDAT3
CASB
DA9-DA0
OEB

I

System clock input

I

System reset actibe LOW

O

820uF to GND940uF to GND

O

When "HIGH" PLL is bypassed, Tied to LOW in normal operation
I
I
I
I

O
O
O
O

I

Write/Read data from MCU to CD-MP3
I

Data strobe signal from MCU
I

Micom command identifier from MCU to CD-MP3

O

Data from CD-MP3 to MCU

O

Intertupt output to MCU

Data BUS

Data BUS

O

Wtite enable

O

Row address strobe

Data BUS

Data BUS

O

Colume address strobe

O

Address output

O

Control output to make data output to "High-Z" at DRAM

DAC

INTERFACE

HOST MCU INTERFACE

HOST MCU

24-2720-22

KA3082 (IC401, IC402) : DC motor driver

1.Pin layout 2.Pin function

Pin No.

BIAS

1234

GND

V

O1

1-38

DRIVER OUT

PRE DRIVER

LOGIC SWITCH

678910

V

V

Z1

CTL

5

V

IN1VIN2

SV

CC

TSD

PV

CC

V

V

O2

Z2

1
2
3
4
5
6
7
8
9

10

Symbol

GND

VO1

VZ1

VCTL

VIN1

VIN2
SVCC
PVCC

VZ2

VO2

Function

I/O

Ground

­Output 1

O

Phase compensation

­Motor speed control

I

Input 1

I

Input 2

I

Supply voltage (Signal)

­Supply voltage (Power)

­Phase compensation

­Output 2

O

TDA7442D (EIC01) : Audio processor

1.Pin layout

MX-GT88

R_IN3
R_IN2
R_IN1

L_IN1
L_IN2 V
L_IN3
L_IN4

MUXOUTL

IN(L)

MUXOUT(R)

IN(R)

BIN(R)

BOUT(R)

BIN(L)

1
2
3
4
5
6
7
8
9
10
11
12
13
14

2.Block diagram

MUXOUT(L)

0.47 F

0.47 F

0.47 F

0.47 F

0.47 F

0.47 F

0.47 F

0.47 F

L-IN1

L-IN2

L-IN3

L-IN4

R-IN1

R-IN2

R-IN3

R-IN4

4

50K

5

50K

6

50K

7

50K

3

50K

2

50K

1

50K

28

50K

31.5dB
control

31.5dB
control

MUXOUT(R)

+

2.2 F

­+

2.2 F

28

R_IN4

27

LOUT

26

ROUT

25

AGND

24

S

CREF23
SDA

22

SCL

21

DIG-GND

20

TREBLE(R)

19

TREBLE(L)

18

PS1

17

LP

16
15

BOUT(L)

100nF

IN(L)

98

30K

SYMULATED

L+R

30K

1110

IN(R)

PS1

17

RPS1

PS1

90Hz

MUSIC/

SYMULATED

SUPPLY

AGND

CREF

MIXING

AMP

MIXING

AMP

22 F

MUSIC

-

L-R

+

OFF

LPF

EFFECT

9KHz

CONTROL

24 25 2316

LP

V

S

1.2nF

5.6nF

TREBLE-L

18

OFF

SURR

TREBLE

TREBLE

SURR

OFF

Vref

TREBLE-R

5.6nF

5.6K

100nF

100nF

BIN(L)

BOUT(L)

15

14

RB

FIX

BASS

I2C BUS DECODER + LATCHES

BASS

12

BIN(R) BOUT(R)

100nF 100nF

5.6K

FIX

VAR

RB

1319

79dB CONTROL

-

VAR

+

FIX

+

-

SPKR

ATT

MUTE

SPKR

ATT

MUTE

79dB CONTROL

D98AU947A

27

LOUT

21

SCL

22

SDA

20

DIG GND

26

ROUT

BA4560 (FIC02) : Dual op amp.

1.Pin layout

OUT1

– IN1

+ IN1

V

1

2

1ch

+

–

3

EE

4

+

2ch

8

7

6

–

5

V

CC

OUT2

– IN2

+ IN2

1-39

MX-GT88

L4959 (PIC02) : Voltage regulator

1.Pin layout

TAB CONNECTED TO PIN 6

2.Block diagram

2/10

V

S

EN 8V

EN 12V(a)

EN 12V(b)

8

7

5

REF
GEN

11
10

9
8
7
6
5
4
3
2
1

D97AU716A

OUT 12V(a)
V

S

OUT 8.6V
EN 8.6V
EN 12V(a)
GND
EN 12V(b)
N.C.
OUT 5.6V
V

S

OUT 12V(b)

5.6V, 250mA

3

OUT 5.6V

REGULATOR

8.6V, 600mA

REGULATOR

9

OUT 8.6V

SWITCHED

12V, 800mA

REGULATOR

11

OUT 12V(a)

SWITCHED

12V, 1.3A

REGULATOR

1

OUT 12V(b)

SWITCHED

1-40

D97AU569C

3.Pin function

Pin Pins Description

1 OUT 12V (b) 12V/1.3A SWITCHED OUTPUT VOLTAGE
2V

S

3 OUT 5.6V 5.6V/250mA OUTPUT VOLTAGE
4 N.C. not connected
5 EN 12V (b) Enable 12V/1.3A SWITCHED OUTPUT VOLTAGE
6 GND Ground
7 EN 12V (a) Enable 12V/0.8A SWITCHED OUTPUT VOLTAGE
8 EN 8.6V Enable 8.6V/0.6A SWITCHED OUTPUT VOLTAGE
9 OUT 8.6 8.6V/0.6A SWITCHED OUTPUT VOLTAGE

10 V

S

11 OUT 12V (a) 12V/0.8A SWITCHED OUTPUT VOLTAGE

Supply Voltage

Supply Voltage

GND

6

M11L1644 (IC602) : DRAM

1. Block diagram

MX-GT88

WE
RAS
CAS

A0
A1
A2
A3
A4
A5
A6
A7
A8
A9

A10

CONTROL

CLOCK

GENERATOR

COLUMN

11

ADDRESS

BUFFER

REFRESH

CONTROLLER

REFRESH
COUNTER

11

ADDRESS

BUFFERS(11)

LOGIC

11

ROW

DATA-IN BUFFER

I/O0

.

.

4

I/O3

DATA-OUT

11

COLUMN

BUFFER

CE

DECODER

2048

4

4

SENSE AMPLIFIERS

I/O RATING

2048 x 4

2048 x 2048 x 4

2048

ROW

11

DECODER

MEMORY

ARRAY

2. Pin function

Pin No.

3~11, 14~19, 7

5

21

4

20

2, 3,22, 23

1, 12

13, 24

6

Symbol

A0~A10

RAS
CAS

WE

OE

I/O0~I/O3

Vcc
Vss

NC

I/O

I/O

Vdd GENERATOR

Function

Address Input
Row Address : A0~A10

I

Column Address : A0~A10
Row Address Strobe

I

Column Address Strobe

I

Write Enable

I

Output Enable

I

Data Input/ Ountput
Power (5V or 3.3V)
Ground

-

No Connect

Vcc
Vss

1-41

MX-GT88

STK403-070 (FIC01) : Power amp.

1.Pin layout

Ch1

+Vcc

2

2.Block diagram

2

out

Ch1

out

41

3

Ch2

out

5

Ch2

out

6

Ch1

10

Ch1

IN

NF

11

+TRE8SUB9GND-Vcc

7

ST-BY

12

Ch2

NF

13

Ch2

IN

14

7

10

11

Pre Driver IC

CH1

R1

R2

C1

1

SUB

STK412-020 (WIC01) : Power amp.

1.Block diagram

13

TR1 TR4

R5

TR3

R6

TR2

3489 6 125

R8

TR5

R7

TR6

R3

R4

C2

Bias Circuit

1817

Pre Driver IC

CH2

TR41

R41

14

13

1

1-42

14

15
16

TR1

TR3

C2

R4
R5

D1

TR6

R6

R3

R7

TR8

TR7

TR9

TR10

9 118

TR19

TR18

TR20

1012

D2

TR2 TR12

R1

C1

TR4

TR5

R2

TR17

R17

R13

TR16

R16

R14

R15

C12

D12

R11

TR14

TR11

C11

TR13

TR15

R12

D41

D51

TR51

Comaprator

SUB

Comaprator

R51

D42

D43

D53

D52

3

2
7
5

4

6

PT8300 (UIC03, UIC04) : DRAM

1.Pin layout

MX-GT88

1

VSS

CLK

LATCH

P15
P14
P13
P12
P11
P10

P9
P8

CLK0

2
3
4
5
6
7
8
9
10
11
12
13
14

/RESET

LATCH0

2.Block diagram

PULLUP

27

28

VDD

VSS

1

4

LATCH

CLK

3
26

DI1

/RESET

2

/RESET

CLKO

14
16

DI2

LATCH0

DO2
DO1

13
25

15

28
27
26
25
24
23
22
21
20
19
18
17
16
15

VDD
PULLUP
DI1
DO2
P0
P1
P2
P3
P4
P5
P6
P7
DI2
DO1

LATCH

RESET

P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15

CLK

DI

CLK

DI

O0
I0

Q0

RESET

D0

LATCH 16-BIT

SHIFT REGISTER1: 16-BIT SHIFT REGISTER SERIAL TO PARALLEL

SHIFT REGISTER2: 16-BIT SHIFT REGISTER SERIAL TO PARALLEL

O7 O8
I7 I8

O15
I15

Q15

DO

D15

DO

3. Pin function
Pin No.

Pin Name
1
2

/RESET
3
4

5-12

13

14
15,25
26,17
17-24

27

LATCH

P15~P8

LATCHO

CLKO

DO1, DO2

DI1, DI2

P7~P0

PULLUP

28

VSS

CLK

VDD

I/O

Function

-

Ground

I

Reset pin

I

Clock input pin

I

Latch input pin

I/O

Parallel data I/O pins

O

Latch output pin

O

Clock output pin

O

Serial data output pins

I

Serial data input pins

O

Parallel data output pin

I

P8 to P15 control pin for internal pull-up resistor
When P8 to P15 are in the output state, the PULLUP pin must be connected to VDD.
When P8 to P15 are in the input state, the PULLUP pin must be connected to VSS.

-

Power supply pin

1-43

MX-GT88

LA72723(IC03) : RDS demodulation

1. Pin layout

VREF
MPXIN
Vdda
Vssa
FLOUT
CIN
TES
XOUT

1
2
3
4
5
6
7
8

2. Block Diagram

Vdda

REFERENCE

VOLTAGE

Vssa

MPXIN

ANTI ALIASING

FILTER

RDS-ID/READY

16

RDCL

15

RDDA

14

RST

13

MODE

12

Vddd

11

Vssd

10

XIN

9

57kHz

BPF

(SCF)

FLOUTVREF

VREF

SMOOTHING

FILTER

CIN

+

-

PLL

(57kHz)

CLOCK

RECOVERY

(1187.5Hz)

DATA

DECODER

RAM

(128-bits)

Vddd

Vssd

RDDA

RDCL

MODE

TEST

3. Pin functions

Pin

Symbol

No.

1

VREF

2

MPXIN

Vdda

3
4

Vssa

5

FLOUT

6

CIN

TEST

7
8

XOUT

9

XIN

10

Vssd

11

Vddd

12

MODE

13
14
15
16

RST

RDDA

RDCL

RDS-ID
READY

TEST

I/O

O

O

O

O

I/O

O

CLK(4.332MHz)

OSC

XIN XOUT

RDS-ID

DETECT

RST

RDS-ID/
READY

Function

Reference voltage output (Vdda/2)

I

Baseband (multiplexed) signal input
Analog power supply (+5V)
Analog ground
Subcarrier input (filter output)

I
I

Subcarrier input (comparator input)
Test input
Crystal oscillator output (4.332MHz)

I

Crystal oscillator input (exeternal reference input)
Digtal ground

Digtal power supply
I
I

Read mode setting (0:master,1:slave)

RDS-ID/RAM reset (positive polarity)

RDS data output

RDS clock output (master mode)/RDS clock input (slave mode)

RDS-ID/READY output (negative polarity)

1-44

< MEMO >

MX-GT88

1-45

MX-GT88

VICTOR COMPANY OF JAPAN, LIMITED

AV & MULTMEDIA COMPANY AUDIO/VIDEO SYSTEM CATEGORY 10-1,1 chome,Ohwatari-machi,maebashi-city,371-8543,Japan

(No.22075)

Printed in Japan
200307