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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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Table of contents
- 1 Top cover
- 2 Safety Precautions
- 3 Important for laser products
- 4 Preventing static electricity
- 5 Importance administering point on the safety
- 6 Disassembly method
- 28 Adjustment method
- 32 Flow of functional operation until TOC read
- 33 Maintenance of laser pickup
- 33 Replacement of laser pickup
- 34 Description of major ICs
- 48 Back cover