JVC MX-GT80 Service manual

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JVC MX-GT80 Service manual | Manualzz

MX-GT80/MX-GT90

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MX-GT80 / MX-GT90

STANDBY/ON

STANDBY

CD-R /RW PLAYBACK

MX-GT80

PLAY & EXCHANGE

J

C

Area Suffix

U.S.A.

Canada

SP-MXGT80 CA-MXGT80 SP-MXGT80

STANDBY/ON

STANDBY

CD-R /RW PLAYBACK

MX-GT90

PLAY & EXCHANGE

Each different point

CD/DECK/RECEIVER Model

MX-GT80

MX-GT90

CA-MXGT80

CA-MXGT90

Contents

Safety precautions

Important for laser products

Preventing static electricity

Importance administering

point on the safety

Disassembly method

Adjustment method

SPEAKER

SP-MXGT80

SP-MXGT90

SP-MXGT90 CA-MXGT90

SP-MXGT90

OUTPUT POWER

MAIN SPEAKER

55W / ch

SUB WOOFER

130W / ch

70W / ch

160W / ch

1-2

1-3

1-4

1-5

1-6

1-28

Flow of functional operation

until TOC read

Maintenance of laser pickup

Replacement of laser pickup

Description of major ICs

1-32

1-33

1-33

1-34

COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.

No.20912

Feb. 2001

MX-GT80/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 circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturer`s warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.

3. Many electrical and mechanical parts in the products have special safety-related characteristics.

These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.

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

5. Leakage currnet check (Electrical shock hazard testing)

After re-assembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.

Do not use a line isolation transformer during this check.

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

Alternate check method

Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground.

Measure the AC voltage across the resistor with the

AC voltmeter.

AC VOLTMETER

(Having 1000 ohms/volts, or more sensitivity)

Move the resistor connection to eachexposed metal part, particularly any exposed metal part having a return path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. voltage measured Any must not exceed 0.75 V AC (r.m.s.).

This corresponds to 0.5 mA AC (r.m.s.).

0.15 F AC TYPE

1500 10W

Place this probe on each exposed metal part.

Good earth ground

1-2

!

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

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

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

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

5. If mains voltage selector is provided, check setting for local voltage.

Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.

MX-GT80/MXGT90

Important for laser products

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the

Laser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.

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

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

6.CAUTION : Use of controls, adjustments or 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.

VARNING : Osynlig laserstrålning är denna del är öppnad och spårren är urkopplad. Betrakta ej strålen.

VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen.

ADVARSEL : Usynlig laserstråling ved åbning , når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling.

ADVARSEL : Usynlig laserstråling ved åpning,når sikkerhetsbryteren er avslott. unngå utsettelse for stråling.

REPRODUCTION AND POSITION OF LABELS

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 ADVARSEL :Usynlig laserstråling denna del är öppnad och spårren är

urkopplad. Betrakta ej strålen. (s) ved åbning , når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling. (f)

1-3

MX-GT80/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.

1-4

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.

CD changer mechanism assembly

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 traverse

unit

Flexible cable

Fig.1

Soldering

Fig.2

Importance administering point on the safety

F102

F101

F001

MX-GT80/MXGT90

Caution: For continued protection against risk of fire, replace only with same type 5A/125V for

F001, 6A/125V for F101 and F102. This symbol specifies type of fast operating fuse.

Precaution: Pour eviter risques de feux, remplacez le fusible de surete de F001 comme le meme type que 5A/125V, et 6A/125V pour F101 et F102.

1-5

MX-GT80/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

Fig.1

Metal cover

A

B

Fig.2

Metal cover

Fig.3

B

1-6

MX-GT80/MXGT90

Removing the CD changer mechanism assembly (See Fig.4 and 5)

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

C

Front panel assembly

1.

Disconnect the card wire from connector CN661 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.

Main board

CN661

3.

Remove the plastic rivet attaching the main board.

Fig.4

4.

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.

CD changer mechanism assembly

Main board

CN661

C

CD changer mechanism assembly

Rear panel

Rear panel

D

Plastic rivet

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.

Front panel assembly

Fig.5

Amplifier board

CN703

Wire clamp

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.

Fig.6

Main board

CN870

CN871

CN315

Front panel assembly

Transformer board

CN220

Front panel assembly

Fig.7

Main board

1-7

MX-GT80/MX-GT90

4.

Remove the four screws E on the bottom of the body.

Front panel assembly

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.

(Bottom)

E

Fig.8

Front panel assembly

Fig.9

Joint a

Joint a

Front panel assembly

Fig.10

1-8

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 antenna board on the right side of the body.

2.

Remove the plastic rivet fixing the antenna board.

3.

Remove the two screws F on the back of the body.

MX-GT80/MXGT90

CN1

Plastic rivet

Tuner board

Rear panel

Fig.11

G

Rear panel

F

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.

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 eleven screws F 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.21)

Joint b

F

F

F

Rear cover

Fig.12

Joint b

Rear panel

F

Fig.13

Joint c

Fig.15

Rear panel

Rear panel

Fig.14

Joint c

1-9

MX-GT80/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.

CN315

Amplifier board

CN704

CN706

1.

Disconnect the card wires from connector CN870,

CN871 and CN315 on the main board.

Main board

CN870

CN871

2.

Disconnect the flat wires from connector CN704 and

CN706 on the amplifier board.

3.

Remove the screw H 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.

Front panel assembly

Fig.16

Plastic rivet

Front panel assembly

Main board

Removing the speaker board

(See Fig.18)

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

REFERENCE: It is not necessary to remove the main board.

1.

Disconnect connector CN217 on the speaker board from the regulator board.

Regulator board

H

Fig.17

CN212

CN211

Speaker board

Regulator board

Fig.18

CN217

1-10

MX-GT80/MXGT90

Removing the amplifier board / voltage board / heat sink (See Fig.19 and 20)

Amplifier board

CN703

CN704

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

Tie band

Voltage board

Tie band

1.

Disconnect the wires from connector CN703, CN704 and CN706 on the amplifier board respectively.

2.

Remove the two tie band attaching the wire to the amplifier board and the voltage board.

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).

Regulator board

CN216

CN215

Fig.19

4.

Pull out the upper and lower heat sink brackets from the heat sink respectively.

5.

Remove the four screws I attaching the amplifier board to the heat sink.

Heat sink bracket

Heat sink

6.

Remove the two screws J, the board bracket and the voltage board.

Voltage board

CN703

Amplifier board

I

I

J

Heat sink bracket

Fig.20

1-11

MX-GT80/MX-GT90

Removing the power transformer assembly (See Fig.21 and 22)

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

Voltage board

Tie band

Transformer board

CN250

CN220

1.

Disconnect the wires from connector CN220 and

CN250 on the transformer board.

Power cord

2.

Disconnect the wire from connector CN204 on the regulator board.

3.

Remove the four screws k attaching the transformer assembly.

Base chassis

Power cord stopper

Power transformer assembly

Fig.21

Transformer board

Regulator board

CN204

CN220

K

Removing the regulator board

(See Fig.23)

Prior to performing the following procedure, remove metal cover, CD changer mechanism assembly, rear panel, tuner board, main board, amplifier board, voltage board and speaker board.

1.

Disconnect the wire from connector CN204 on the regulator board.

2.

Remove the two screws L attaching the regulator board.

Power transformer assembly

K

Tie band

CN250

Fig.22

Power cord stopper

Removing the power cord (See Fig.21)

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

1.

Disconnect the wire from connector CN250 on the transformer board.

2.

Remove the tie band from the voltage board.

3.

Move the power cord stopper upward and pull out it from the base chassis.

L

CN204

Power transformer assembly

L

Regulator board

Fig.23

1-12

MX-GT80/MXGT90

<Front panel assembly>

Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly and the front panel assembly.

Head amplifier

& Mechanism control board

CN306

M

Removing the cassette mechanism assembly (See Fig.24)

1.

Disconnect the card wire from connector CN306 on the head amplifier & mechanism control board.

M

M'

2.

Remove the four screws M and three screws M' attaching the cassette mechanism assembly.

Cassette mechanism assembly

M'

Fig.24

Removing the display system control board (See Fig.25 to 27)

1.

Remove the five screws N attaching the stay bracket.

2.

Disconnect the card wires from connector CN316 and

CN880 on the display system control board.

3.

Remove the seven screws O 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. 28)

N

Display system control board

Fig.25

O

CN316

Removing the CD play board

(See Fig.27 and 28)

1.

O

Remove the three screws P attaching the CD eject board.

FW915

(Soldering)

O

2.

If necessary, unsolder FW915 on the CD eject board.

P

CD playt board

FW915

(Soldering)

P

N

M

M'

Stay bracket

O

O

CN880

Display system control board

Fig.26

CD play board

CN911

FW915

FW915

Fig.28

Display system control board

Fig.27

1-13

MX-GT80/MX-GT90

Removing the preset / tuning switch board (See Fig.29 and 30)

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 Q attaching the preset / tuning switch board.

3.

If necessary, unsolder FW901 on the preset / tuning switch board.

Q

Preset / tuning switch board

Preset knob

Q

Fig.29

Surround mode knob

Surround woofer level knob

Removing the operation switch board

(See Fig.30 and 31)

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 surround mode knob and the surround woofer level knob toward the front.

2.

Remove the twelve screws R attaching the operation switch board.

3.

Remove the screw R' attaching the earth terminal extending from the switch board.

4.

Release each tab of the seven joints g retaining the operation switch board.

Nut

Joints g

Volume knob

Fig.30

R

Joint g

R

R

Joint g

R

Operation switch board

Joints g

R R

Fig.31

R

Joint g

R'

1-14

MX-GT80/MXGT90

Speaker section 1

(SP-MXGT80)

Removing the front panel (See Fig.1)

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.

A

Removing the speaker (tweeter)

(See Fig.2)

Prior to performing the following procedures, remove the front panel.

1.

Remove the two screws B attaching the speaker

(tweeter) on the front of the body.

2.

Disconnect the wire from two speaker terminals of the speaker (tweeter).

A

B

Fig.1

A

Front panel

A

Speaker (squawker)

Removing the speaker (squawker)

(See Fig.3)

Prior to performing the following procedures, remove the front panel.

Speaker (tweeter)

1.

Remove the four screws C attaching the speaker

(squawker) on the front of the body.

2.

Disconnect the wire from the two speaker terminals of the speaker (squawker).

Fig.2

Speaker (squawker)

C

C

Fig.3

1-15

MX-GT80/MX-GT90

Removing the speaker (woofer)

(See Fig.4 and 5)

Prior to performing the following procedures, remove the front panel.

1.

Remove the six screws D attaching the punch panel on the front of the body.

Attention : When reassembling the punch panel,

need to put glue all around. this is

important to prevent vibration.

2.

Remove the four screws E attaching the speaker

(woofer) on the front of the body.

3.

Pull out the speaker (woofer) toward the front and disconnect the wire from the two speaker terminals.

D

Fig.4

Speaker (woofer)

Removing the sub panel (See Fig.6 )

Prior to performing the following procedures, remove the front panel.

1.

Remove the six screws F attaching the sub panel on the back of the front panel.

2.

Remove the sub panel toward the front.

E

Sub panel

Fig.5

Punch panel

D

E

F

F

Front panel

Fig.6

1-16

MX-GT80/MXGT90

Speaker section 2

(SP-MXGT90)

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

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.

A

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.

Speaker terminals

Fig.1

Speaker (tweeter)

Fig.2

C

Sub panel

B

C

A

Front panel

A

Front panel

Fig.4

C

Speaker (tweeter)

Front panel

Fig.3

Speaker (tweeter)

1-17

MX-GT80/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.

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 G

Front panel

E

D

F

Fig.5

Punch panel

Fig.6

Speaker (squawker)

Speaker (squawker)

D

Speaker (woofer)

E

F

Fig.7

Fig.8

1-18

MX-GT80/MXGT90

A

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

CN854

CN651

CD servo control board

CN801

CN652

CN151

a

A

Removing the CD tray assembly

2.

Remove the CD changer mechanism assembly.

3. Remove the CD Servo control board.

4.

Remove the screw B' retaining the lod stopper.

5.

From the T.bracket section "b" and clamper base section "c" , remove both of the edges fixing the rod(See Fig.2 and 3).

6.

Remove the screw B retaining the disc stopper

(See Fig.3).

7.

Remove the three screws C retaining the T.bracket

(See Fig.3).

8.

Remove the screw D retaining the clamper assembly

(See Fig.3).

9.

From the left side face of the chassis assembly, remove 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

C a

B

B'

C

Lod stopper

(C/J version only)

C

D b b

A

CN601

Fig.1

Rod

T.Braket

Fig.2

A

Earth wire

Clamper base

d c

Return spring

E

Lock lever

Fig.4

Clamper ass'y

Fig.3

1-19

MX-GT80/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.

12.

Make sure that the driver unit elevator is positioned as shown in Fig.6 from to the second or fifth hole on the left side face of the CD changer mechanism assembly.

[Caution] 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.

13.

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).

14.

Pull out all of the three stages of CD tray assembly in the arrow direction "f" until these stages stop

(See Fig.6).

15.

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.

Chassis assembly

f

CD tray assembly

Refer to Fig.7

Pawl

g

Fig.6

CD

3

CD

2

CD

1

1-20

Pulley gear

Motor pulley

Fig.8

Fig.5

Fig.9

Stopper

e

CD tray assembly

Fig.7

Drive unit of elevator

CD tray assembly

MX-GT80/MXGT90

Cams R1, R2 assembly

Removing the CD loading mechanism

assembly(See Fig.10)

1.

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.

2.

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" .

2.

By raising the CD loading mechanism assembly in the arrow direction "l", remove the assembly from the lifter unit

Cam R1, R2 assembly

Arrow

h i

F

F

F

F

CD loading mechanism assembly

Fig.10

CD traverse mechanism

Arrow

k j

Lifter unit

Arrow

l

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" .

2.

According to the above step, shift the CD pickup unit to the center position.

3.

While pressing the stopper retaining the shaft in the arrow direction "o" , pull out the shaft in the arrow direction "p".

4.

After dismounting the shaft from the CD pickup unit, remove the CD pickup unit

Fig.12

CD Pickup unit

o

Shaft

Stopper

p

Shaft

n m

CD loading mechanism

Shaft

Cam gear

Fig.13

Stopper

1-21

MX-GT80/MX-GT90

Removing the try select switch board

(See Fig.14)

1.

Remove the two screws G retaining the tray select switch board.

2.

Disconnect the tray select switch board from connector

CN804 on the CD servo control board.

Chassis assembly

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".

3.

Pull out the drive unit and cylinder gear(See Fig.17).

4.

While turning the cam gear "q", align the Paul "s" position of the select lever to the notch position(Fig.18) on the cam gear "q".

5.

Remove the four screws H retaining the cam unit(cam gear "q" and cams R1/R2 assembly)(See Fig.18).

Drive unit

r

Tray select switch board

CN854

CN851

Fig.14

Cam gear

q

CN804

G

Drive unit

Cylinder gear

Fig.15

Cam gear

q

H

Cams R1, R2 assembly

Cam unit

H s

J

Fig.16

Select lever

Fig.17

1-22

MX-GT80/MXGT90

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).

3.

From the notch "u section" on the chassis assembly fixing the edge of gear bracket, remove and take out the gear bracket(See Fig. 19).

4.

Remove the belts respectively from the right and left actuator motor pulleys and pulley gears(See Fig. 18).

5.

After turning over the chassis assembly, remove the 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

u

Gear bracket

v

Gear bracket

Pulley gear

Belt

Motor pulley

I

Pulley gear

Belt

Motor pulley

I

Fig.18

Actuator motor

Pawl

t v

Fig.19

Assembly and Configuration Diagram

Pulley gear

Pulley gear

Gear B

Fig.20

Cylinder gear

Gear B

Gear C

Select gear

Gross gear L

Gross gear U

Gear C

Fig.21

1-23

MX-GT80/MX-GT90

Removing the cams R1/R2 assembly

and cam gear q(See Fig.22)

1.

Remove the slit washer fixing the cams R1 and R2 assembly.

2.

By removing the two pawls "w" fixing the cam R1, separate R2 from R1.

3.

Remove the slit washer fixing the cam gear "q".

4.

Pull out the cam gear "q" from the C.G. base assembly.

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. 24).

Slit washer

Cam gear q

Slit washer

Cam R2

J

Pawl

Cam R1

w

Pawl

w

Cam switch board

C.G. base assembly

Cam gear q

Notch

Pawl

x

Cylinder gear

Drive unit

Fig.22

Cam R1, R2 assembly

Gear unit

Fig.23

Gear bracket

1-24

MX-GT80/MXGT90

< Cassette mechanism section >

Cassette mechanism

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.

Head mount

Fig.1

Flexible

P.C.board

Playback/Recording & eraser head

Flywheel R

Trigger arm

(Mechanism A side)

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

Flywheel R

(Mechanism A side)

Playback head

Reversing azimuth screw

Spring "a"

Head mount

Flexible

P.C.board

FPC holder

Fig.3

CN302

Head amplifier & mechanism control

P.C. board

(Mechanism B side)

1-25

MX-GT80/MX-GT90

Removing the head amp. and mechanism

control board (See Fig. 4)

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

A

CN303

A

Head amplifier & mechanism control board

A

CN302 CN301

A

Fig.4

Flexible board

A

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)

Flexible board

B B Capstan motor assembly

B B B

Fig.5

B

Capstan belt A

Fig.7

Capstan belt B

Capstan belt A

Capstan motor

Capstan belt B

Motor pulley

Fig.6

1-26

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 "b" fixing the capstan shafts

R and L, and pull out the flywheels R and L respectively

from behind the cassette mechanism.

MX-GT80/MXGT90

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.

c d

a

Slit washer "a"

Fig.9

b

Slit washer "b"

e f g

Reel pulse board

h i

Solenoid

Solenoid

Fig.11

1-27

MX-GT80/MX-GT90

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

AC120V(60Hz)

Measurement output terminal : Speaker out

:TP101(Mesuring for TUNER/DECK/CD)

:Dummy load 6ohm

Radio input signal

AM modulation frequency : 400Hz

Modulation factor : 30%

FM modulation frequency : 400Hz

Frequency displacement : 22.5kHz

Frequency Range

AM 531kHz~1710kHz

FM 87.5MHz~108MHz

Standard measurement positions of volume and switch

Power : Standby (Light STANDBY Indicator)

Sub woofer VOL. : Minimum

Sound mode : OFF

Main VOL. : 0 Minimum

Traverse mecha set position : Disc 1

Mic MIX VOL : MAX

ECHO : OFF

Precautions for measurement

1. Apply 30pF and 33kohm to the IF sweeper output

side and 0.082 F and 100kohm in series to

the sweeper input side.

2. The IF sweeper output level should be made as

low as possible within the adjustable range.

3. Since the IF sweeper is a fixed device, there is

no need to adjust this sweeper.

4. Since a ceramic oscillator is used, there is no need

to perform any MPX adjustment.

5. Since a fixed coil is used, there is no need to adjust

the FM tracking.

6. The input and output earth systems are separated.

In case of simultaneously measuring the voltage

in both of the input and output systems with an

electronic voltmeter for two channels, therefore,

the earth should be connected particularly.

7. In the case of BTL connection amplifier, the minus

terminal of speaker is not for earthing. Therefore,

be sure not to connect any other earth terminal

to this terminal. This system is of an OTL system.

1-28

MX-GT80/MXGT90

Arrangement of adjusting positions

Cassette mechanism section (Mechanism A section) Cassette mechanism section (Back side)

Head azimuth adjusting screw

(Forward side)

Head azimuth adjusting screw

(Reverse side)

Head azimuth adjusting screw

(Forward side)

Playback head

Head azimuth adjusting screw

(Reverse side)

Playback, recording and eraser heads or playback head

Cassette Mechanism Unit Section

Tape speed ADJ

Bias ADJ L

Bias ADJ R

1-29

MX-GT80/MX-GT90

Tape recorder section

Items

Confirmation of head angle

Measurement conditions

Test tape

:TMT7036(10kHz)

Measurement output terminal

:Speaker terminal

Speaker R

(Load resistor:6 )

:Headphone terminal

Measurement method

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.

Standard values

Maximum output

Adjusting positions

Adjust the head azimuth screw only when the head has been changed.

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.

Tape speed of decks

(A and B)

:3,000Hz

60Hz

VR301

Reference values for confirmation items

Items

Double tape speed

Measurement conditions

Test tape

:TMT7036(10kHz)

Measurement output terminal

:Speaker terminal

Speaker R

(Load resistance:6 ) measurement output terminal

:Headphone terminal

Measurement method

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.

Difference between the forward and reverse speed.

P.mecha and

R/P mecha speed

Standard values

4,800+400/

-300Hz

Adjusting positions

Playback mechanism side

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.

60Hz or less

Both the playback and recording & playback mechanism

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 wow & flutter should be 0.25% or less(WRMS).

with in

0.25%

JIS(WTD)

Both the playback and recording & playback mechanism

1-30

MX-GT80/MXGT90

Electrical performance

Items

Adjustment of recording bias current

(Reference value)

Measurement conditions

Measurement method

*Mode : Forward or

reverse mode

*Recording mode

*Test tape

: AC-225

Measurement output terminal

:Both recording and

headphone terminals

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.

Output deviation between

1kHz and

10kH

:-1dB 2dB

LcH

:VR101

RcH

:VR201

Reference values for electrical function confirmation items

Items

Recording bias frequency

Measurement conditions

*Recording and playback side forward or reverse

*Test tape

:TYP AC-225

*Measurement

terminal BIAS TP on

P.C.board

Measurement method

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.

Standard values

100kHz

+9kHz

-7kHz

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.

TYP

:75mA

Adjusting positions

1-31

MX-GT80/MX-GT90

Flow of functional operation until TOC read

Power ON

Play Key

Slider turns REST

SW ON.

Check Point

Confirm that the voltage at the pin5 of CN801 is "H"\"L"\"H".

Automatic tuning of TE offset

Laser ON

Check that the voltage at the pin40 of IC651 is + 5V?

Tracking error waveform at TOC reading

Approx.3sec

pin 25 of

IC601(TE)

VREF

Approx

1.8V

Disc states to rotate

Tracking servo off states

Automatic measurement of TE amplitude and automatic tuning of

TE balance

Tracking servo on states

Disc to be braked to stop

TOC reading

finishes

500mv/div

2ms/div Fig.1

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

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

1-32

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?

NO

Replace it.

MX-GT80/MXGT90

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.

YES

O.K

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.

1-33

MX-GT80/MX-GT90

Description of major ICs

AN7345(IC302) PB/REC AMP

1. Block diagram

L1

24

L2

23

NF1

OUT1

22

21

EQ1

20

Pre

AMP

CTL1

19

RIN1

18

RNF1 ROUT1

17

16

EQ

CTL

15

Pre

Source

CTRL

ALC

AMP

RF

VCC

14

13

REPPLE

REJ

1

2

R1

R2

Pre

AMP

EQ

CTRL

ALC

AMP

ALC

3 4

NF2

OUT2

5

6

7 8

EQ2

CTL2

RIN2 RNF2

9

10 11

12

ROUT2

LC

LPF GND

2. Pin Function

Pin

No.

Symbol

I/O

1

R1

Function

I

Playback amplifier input

2

R2

I

Playback amplifier input

Pin

No.

13

Symbol

Vcc

I/O

I

Power supply

Function

14

RF

3

NF2

I

Playback amplifier negative feedback

15

EQCTL

4

OUT2

5

6

EQ2

CTL2

7

RIN2

O

Playback amplifier output

I

Equalizer

I Pre Amplifier input switching time constant

I

Recording amplifier input

16

17

18

ROUT1

RNF1

RIN1

8

9

10

RNF2

ROUT2

LC

I Recording amplifier negative feedback

O Recording amplifier output

I

ALC low cut

19

CTL1

20

21

22

EQ1

OUT1

NF1

11

LPF

12

GND I

I ALC low pass filter

23

L2

24

L1

I

Ripple filter

I

EQ control

O

Recording amplifier output

I

Recording amplifier negative feedback

I Recording amplifier input

I Pre amplifier input switching control

I

O

I

Equalizer

Playback amplifier output

Playback amplifier negative feedback

I

Playback amplifier input

I

Playback amplifier input

1-34

MX-GT80/MXGT90

BA15218F-XE (IC652) / BA15218N (IC481,501,502,526,546,571) : Dual op. amp.

1. Pin layout

OUT1 1

-IN1 2

+IN1 3

VEE 4

1

2

8 Vcc

7 OUT2

6 -IN2

5 +IN2

2. Block diagram

Vcc

-IN

+IN

Q3

R2

R1

Q5

Q1 Q2

D1

Q4

C1

R3

Q8

Q13 Q18 Q19

C2

Q9

R5

Q6

Q11

R6

Q10

R7

Q12

R8

Q7

OTHER

CH

Q16

R4

Q17

Q14 Q114 Q15

R9

VEE

OUTPUT

1-35

MX-GT80/MX-GT90

BA3126N(IC301) : R/P Switch

1 2 3 4 5 6 7 8 9

LB1641 (IC851,IC852) : DC motor driver

1. Pin layout

1 2 3

GND OUT1 P1

4

VZ

5 6 7 8 9

IN1 IN2

VCC1 VCC2 P2

10

OUT2

2. Pin function

IN1

0

1

0

1

Input

IN2

1

1

0

0

Output

OUT1

0

0

0

1

OUT2

1

0

0

0

Mode

Brake

CLOCKWISE

COUNTER-CLOCKWISE

Brake

1-36

BA3835S (IC812) : SPI B.P.F.

1.Block Diagrams

BIASC

1

BIAS

VREFC

2

VREF

RREF

3

REFERENCE

CURRENT

N.C.

4

N.C.

5

DIFOUT

6

CIN

7

AIN

8

A-C

DIF

105Hz

BPF

340Hz

BPF

1kHz

BPF

3.4kHz

BPF

10.5kHz

BPF

PEAK

HOLD

RES

PEAK

HOLD

PEAK

HOLD

RES

RES

PEAK

HOLD

RES

PEAK

HOLD

RES

MPX

VCC 9

DEC

18

GND

17

AOUT

16

TEST

15

N.C.

14

N.C.

13

SEL

12

C

11

B

10 A

2.Pin Function

No.

13

14

15

16

9

10

11

12

17

18

7

8

5

6

3

4

1

2

Symbol

VCC

SPI-A

SPI-B

SPI-C

SPICSB

NC

NC

TEST

AOUT

GND

BIASC

VREFC

RPEF

NC

NC

NC

CIN

AIN

O

O

O

-

-

O

I

-

O

-

-

-

-

-

-

-

I/O

-

-

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.

MX-GT80/MXGT90

1-37

MX-GT80/MX-GT90

BU2092/F(IC811):PORT EXPANDER

1.Terminal Layout

Vss

1

DATA

2

CLOCK

3

LCK

4

Q0

5

Q1

6

Q2

7

Q3

8

Q4

9

CONTROL

CIRCUIT

2.Pin Function

Pin No.

1

2

3

4

5~16

Symbol

Vss

DATA

CLOCK

LCK

Q0~Q11

I

I

I/O

-

I

O

Function

Connect to GND

Serial Data input

Shift Clock of Data

Latch Clock of Data

Parallel Data Output

Latch Data L H

OUTPUT ON OFF

17

18

OE

Vdd

I

-

Output Enable

Power Supply

18

Vdd

17

OE

16

Q11

15

Q10

14

Q9

13

Q8

12

Q7

11

Q6

10

Q5

1-38

MX-GT80/MXGT90

LA1838(IC1): FM AM IF AMP&detector, FM MPX decoder

1. Block Diagram

30 25 24 23 22 21

20

19

18

ALC

BUFF

29

28

AM

OSC

REG

AM

MIX

27

FM

RF.AMP

26

DECODER

ANIT-BIRDIE

MUTE

P-DET

STEREO

5N

SW

AGC

AM IF

DET

SD

COMP

VCO

384KHz

FF

38k

FF

19k

/

2

17 16

FF

19k

/

LS

PILOT

DET

AM

S-METER

FM

S-METER

S-CLRVE

AM/FM

IF-BUFF

TUNING

DRIVE

STEREO

DRIVE

FM IF

PM

DET

GND

1 2

2. Pin Function

Pin

No.

Symbol I/O

1

FM IN

I

3 4

5

Function

6

This is an input terminal of FM IF signal.

2

AM MIX

O This is an out put terminal for AM mixer.

3 FM IF I

Bypass of FM IF

4 AM IF

I

Input of AM IF Signal.

5

6

7

8

9

10

GND

TUNED

STEREO

VCC

FM DET

AM SD

O

This is the device ground terminal.

When the set is tuning, this terminal becomes "L".

O

Stereo indicator output. Stereo "L",

Mono: "H"

This is the power supply terminal.

FM detect transformer.

This is a terminal of AM ceramic filter.

11 FM VSM

O

Adjust FM SD sensitivity.

7

12

13

14

15

AM VSM O Adjust AM SD sensitivity.

MUTE

FM/AM

I/O

When the signal of IF REQ of IC121(

LC72131) appear, the signal of FM/AM

IF output. //Muting control input.

I

Change over the FM/AM input.

"H" :FM, "L" : AM

MONO/ST O

Stereo : "H", Mono: "L"

VCC

8

Pin

No.

16

17

18

19

20

21

22

9

10 11 12 13 14 15

Symbol

L OUT

I/O

Function

O

Left channel signal output.

R OUT

L IN

R IN

RO

LO

IF IN

O Right channel signal output.

I

I

Input terminal of the left channel post

AMP.

Input terminal of the right channel post AMP.

O Mpx Right channel signal output.

O

Mpx Left channel signal output.

I

Mpx input terminal

23

24

FM OUT

AM DET

O

O

FM detection output.

AM detection output.

25

26

AM AGC

AFC

I

This is an AGC voltage input terminal for AM

This is an output terminal of voltage for FM-AFC.

AM RF signal input.

27

28

29

AM RF

REG

AM OSC

I

O Register value between pin 26 and pin28 desides the frequency width of the input signal.

This is a terminal of AM Local oscillation circuit.

30 OSC BUFFER

O

AM Local oscillation Signal output.

1-39

MX-GT80/MX-GT90

LA6541-X (IC801) : Servo driver

1. Pin Layout & block diagram

Vcc Vref Vin4 Vg4 Vo8 Vo7

24 23

22

21

20

19

11k ohm

Vcc

- +

Level shift

B T L driver

Gnd

- +

Vo6 Vo5

18 17

Vg3 Vin3 Cd

16 15 14

11k ohm

Res

13

B T L driver

Level shift

RESET

Level shift

B T L driver

B T L driver

Level shift

Regulator

11k ohm

1

2

3 4 5 6

Vcc Mute Vin1 Vg1 Vo1 Vo2

2. Pin function

Gnd

11k ohm

7 8 9 10 11

Vo3 Vo4 Vg2 Vin2 Reg

out

11

12

13

14

9

10

7

8

5

6

3

4

Pin

No.

1

2

19

20

21

22

15

16

17

18

23

24

Symbol Function

Vg2

Vin2

Reg Out

Reg In

Res

Cd

Vin3

Vg3

Vcc

Mute

Vin1

Vg1

Vo1

Vo2

Vo3

Vo4

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)

12

Reg

In

1-40

MX-GT80/MXGT90

LC72136N (IC2) : PLL frequency synthesizer

1. Pin layout

XT

FM/AM

CE

DI

CLOCK

DO

FM/ST/VCO

AM/FM

SDIN

5

6

7

8

1

2

3

4

9

10

11

22

21

20

19

18

17

16

15

14

13

12

XT

GND

LPFOUT

LPFIN

PD

VCC

FMIN

AMIN

IFCONT

IFIN

2. Block diagram

Reference

Driver

Phase

Detector

Charge Pump

1

22

16

1/2

Unlock

Detector

18

19

20

15

12bit

Programmable

DriverS

12

3

4

5

6

17

21

C

2

B

I/F

Power on

Reset

Data Shift Register & Latch

Universal

Counter

7 8 2

11

13

3. Pin function

8

9

10

11

5

6

2

3

Pin

No.

1

4

7

Symbol

XT

FM/AM

CE

DI

CLOCK

DO

FM/ST/VCO

I/O

I

O

I

I

I

O

O

Function

X'tal oscillator connect (75kHz)

LOW:FM mode

When data output/input for 4pin(input) and

6pin(output): H

Input for receive the serial data from controller

Sync signal input use

Data output for Controller

Output port

"Low": MW mode

15

16

17

18

AM/FM

LW

MW

SDIN

O

I/O

I/O

I/O

Open state after the power on reset

Input/output port

Input/output port

Data input/output

Pin

No.

12

13

14

Symbol

IFIN

IFCONT

I/O

I

O

-

Function

IF counter signal input

IF signal output

Not use

19

20

21

22

AMIN

FMIN

VCC

PD

LPFIN

LPFOUT

GND

XT

I

-

I

O

I

-

I

O

AM Local OSC signal output

FM Local OSC signal input

Power suplly(VDD=4.5-5.5V)

When power ON:Reset circuit move

PLL charge pump output(H: Local OSC frequency Height than Reference frequency.

L: Low Agreement: Height impedance)

Input for active lowpassfilter of PLL

Output for active lowpassfilter of PLL

Connected to GND

X'tal oscillator(75KHz)

1-41

MX-GT80/MX-GT90

Pin No.

34

35

36

37

30

31

32

33

26

27

28

29

22

23

24

25

42

43

44

45

38

39

40

41

46

47~63

9,10

11

12,13

14

15

16C19

20

21

7

8

5

6

3

4

1

2

MN101C35DEA1 (IC810) : System controller

Pin function (1/2)

I/O

I

I

I

I

I

O

O

I

I

O

I

I

I

-

I

-

O

O

O

O

I

O

O

O

O

O

I

I

I

-

I/O

-

-

-

-

-

I

O

O

I

O

O

Symbol

NC

SPIDTI

VREF+

MRDY

RESET

BASS VOL+

BASS VOL-

AUX MUTE

RDSDATA/KARA

SPI A

SPI B

REMIN

PHOTOA

PHOTOB

SOUNDMODE+

RDS_CLK

KCMND

MSTAT

KCLK

DATAOUT

DATAIN

CK

NC

VDD

OSC2,1

VSS

NC

MMOD

VREF-

KEY1~4

SLCKEY1

SLCKEY2

PRT

TAPE LED

ECON

POUT

VOLDA/EXT

VOLCK/EXT

EXTCE

SLCCE

VC3 RESET

G17~1

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

Maicon reset

Bass volume +

Bass volume -

Mute 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

1-42

Pin No.

97

98

99

100

93

94

95

96

64~85

86

87

88

89

90

91

92

Pin function (2/2)

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

-

I

I

I

I

I

I

I

O

O

O

I

O

O

O

O

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 VOL-

Rotary encoder VOL+

Soundmode foeward

-B for FL

MX-GT80/MXGT90

1-43

MX-GT80/MX-GT90

MN662748RPM (IC651) : Digital servo & digital signal processer

1. Pin layout

20 ~ 1

21

80

40

61

41 ~ 60

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

8TIMES

OVER SAMPUNC

DIGITAL FILTER

EFM

DEMODULATION

SYNC

INTERPOLATION

SUBCODE

DEMODULATION

VCO

ITUNING

GENERATION

PITCH

CONTROL

MICRO

COMPUTER

INTERFACE

1BIT

DAC

LOGIC

S

16k

SRAM

CIRC

ERROR

CORRECTION

DEINTERLEVE

CLV

SERVO

PEM

(R)

PEM

(L)

DIGITAL

AUDIO

INTERFASE

DIGITAL

AUDIO

INTERFASE

INTER POLATION

SOFT MUTING DIGITAL

ATTENUATION

PEAK DETECTIVE

AUTO CUE

D/A

CONVERTER

OUTPUT PORT

V

D

D

V

S

S

D

V

D

D

1

D

V

S

S

1

/

R

S

T

/

T

E

S

T

A/D

COVERTER

F

E

T

E

R

F

E

N

V

INPUT

T

R

C

R

S

V

D

E

T

B

D

O

SERVO

TIMING GENERATOR

/

R

F

D

E

O

F

T

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

1-44

MX-GT80/MXGT90

8

9

10

11

3. Pin function

Pin

No.

Dymbol I/O

1 BCLK O Not used

5

6

2

3

4

LRCK O

SRDATA O

DVDD1

DVSS1

TX

O

Not used

Function

Not used

Power supply (Digital)

Connected to GND

Digital audio interface output

7 MCLK

I

CPU command clock signal input

(Data is latched at signal's rising point)

12

13

MDATA

MLD

SENSE

FLOCK

TLOCK

BLKCK

I

I

O

O

CPU command data input

CPU command load signal input

Sense signal output

Focus lock signal output Active :Low

O

O

Tracking lock signal output Active :Low sub-code/block/clock signal output

14

15

16

18

19

20

21

22

23

30

31

32

17

24

25

26

27

28

29

33

34

35

36

37

38

39

40

SQCK

SUBQ

DMUTE

STATUS

RST

SMCK

PMCK

TRV

TVD

PC

I

O

Outside clock for sub-code Q resister input

Sub-code Q -code output

O

I

O

O

Connected to GND

Status signal

(CRC,CUE,CLVS,TTSTOP,ECLV,SQOK)

Reset signal input (L:Reset)

Not used

Not used

Traverse enforced output

Traverse drive output

Not used

ECM

ECS

KICK

TRD

FOD

VREF

FBAL

TBAL

FE

TE

RF ENV

VDET

OFT

TRCRS

I

I

I

I

I

I

O

O

O

O

Spindle motor drive signal (Enforced mode output) 3-State

Spindle motor drive signal (Servo error signal output)

Kick pulse output

Tracking drive output

O

I

O

O

Focus drive output

Reference voltage input pin for D/A output block (TVD,FOD,FBA,TBAL)

Focus Balance adjust signal output

I

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)

RFDET

BDO

LDON

I

O

BDO input pin (L:detect)

Laser ON signal output (H:on)

Pin

No.

41

Symbol I/O

PLLF2 O

Function

Tracking error shunt signal output (H:shunt)

42

43

TOFS

WVEL

Not used

Not used

I 44

45

46

ARF

IREF

DRF

I

I

RF signal input

Reference current input pin

Bias pin for DSL

47

DSLF

I/O Loop filter pin for DSL

48

49

50

51

52

53

PLLF

VCOF

AVDD2

AVSS2

54

55

56

EFM

PCK/

DSL2

VCOF2

SUBC

SBCK

I/O

O

Loop filter pin for PLL

Not used

Power supply (Analog)

Connected to GND (Analog)

Not used

DSL balance output

57

VSS

58

59

60

61

XI

X2

VDD

BYTCK

62

63

CLDCK

FCLK

I

O

The external circuit is regulated for crystal.

Not used

Not used

Connected to GND (for X'tal oscillation circuit)

Input of 16.9344MHz X'tal oscillation circuit

Output of X'tal oscillation circuit

Power supply (for X'tal oscillation circuit)

Not used

Not used

Not used

64

IPPLAG

Not used

65

66

67

68

FLAG

CLVS

CRC

DEMPH

Not used

Not used

Not used

Not used

69 RESY

Not used

70

71

IOSEL

76

77

78

72

73

74

75

TEST

AVDD1

OUT L

AVSS1

OUT R

RSEL

CSEL

PSEL pull up pull up

O

Power supply (Digital)

Lch audio output

O

Connected to GND

Rch audio output pull up

Connected to GND

Connected to GND

79

80

MSEL

SSEL

Connected to GND

Pull up

1-45

MX-GT80/MX-GT90

STK402-030 (IC301) :

1.Pin layout

1

2.Block diagram

15

4

1

TR1

2

TR3

R2

R1

TR2

D1

TR7

TR4

C1

R3

R4

TR5

R5

TR6

R6

TR8

R7

5

SUB

13 12 7 6 10 11

8

TR9

TR10

R8

TR11

C2

TR12

R11

R12

TR13

R10

R9

TR14

TR16

R13

TR15

R14

9

14 15

1-46

MX-GT80/MXGT90

TDA7439 (IC436) : Control volume

1.Pin layout

SDA

CRE

Vs

AGND

ROUT

LOUT

R-IN4

R-IN3

R-IN2

R-IN1

L-IN1

L-IN2

L-IN3

L-IN4

MUXOUTL

7

8

9

10

3

4

5

6

1

2

11

12

13

14

15

TDA7439

27

26

25

24

30

29

28

23

22

21

20

19

18

17

16

CSL

DIG GND

TREBLE(R)

TREBLE(L)

MIN(L)

MOUT(L)

BOUT(L)

BIN(L)

BOUT(R)

BIN(R)

MOUT(R)

MIN(R)

INR

MUXOUTR

INL

2.Block diagram

15 16 27

26 25

23

24

L-IN1

11

L-IN2

12

L-IN3

13

L-IN4

14

R-IN1

10

R-IN2 9

R-IN3

8

R-IN4

7

G

0/30dB

2dB STEP

VOLUME

TREBLE

MIDLE

2

I C BUS DECODER LATCHES

BASS

SPEAKER

ATT

LEFT

6 LOUT

30

SCL

1

SDA

29

DIG-GND

5 ROUT G VOLUME

TREBLE

INPUT

MULTIPLEXER

GAIN

17 18

28

MIDLE

BASS

19 20 21 22

SPEAKER

ATT

RIGHT

SUPPLY

2

3

4

Vs

AGND

1-47

MX-GT80/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.20912)

Printed in Japan

200102(V)

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