JVC J300.1, J300 Service Manual

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MX-J300

J
C

MX-J300

Area Suffix

U.S.A.

Canada

RM-SMXJ300V REMOTE CONTROL

CLOCK TIMER POWER

1

2 3

–+

SELECT

SLEEP

4 5 6

SET

AUX

7 8 9

FM MODE

FM/AM

10+10

PLAY MODE

CD3CD2CD1

C D

/CLEAR

TAPE

A – TAPE - B

REC PAUSE

SHIFT

ACTIVE

SOUND

VOLUME

BASS EX.

MODE

Contents

Safety Precautions
Important for laser products
Preventing static electricity
Disassembly method
Adjustment method

COMPACT

CD

STANDBY

POWER

COMPACT

DIGITAL AUDIO

PLAY & EXCHANGER

1 BIT

DUAL D/A CONVERTER

PHONES

PANEL OPEN / CLOSE

TAPE

COMPU

AUX

PLAY

CONTROL

EJECT

PLAY

FULL - LOGIC CONTROL

1-2
1-3
1-4
1-5
1-24

MX-J300

POWERED ROLLING PANEL

AUTO REVERSE

Flow of functional operation
unit TOC read

Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs

3

CD

2

CD

3

CD

2

CD

1

CD

1

VOLUME

+

–

CD

FM /AM

EJECT

REC/PLAY

DIGITAL AUDIO

1-27
1-28
1-28
1-29

COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.

No.20818

Jul. 2000

MX-J300

Safety Precautions

1. This design of this product contains special hardware and many circuits and components specially
for safety purposes. For continued protection, no changes should be made to the original design
unless authorized in writing by the manufacturer. Replacement parts must be identical to those
used in the original circuits. Services should be performed by qualified personnel only.

2. Alter ations 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 proper ty
damage resulting therefrom.

3. Many electrical and mechanical par ts 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 or iginal lead
routing and dress should be observed, and it should be confirmed that they have been returned
to normal, after re-assembling.

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

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

Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms
per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by
a 0.15 F AC-type capacitor between an exposed
metal part and a known good earth ground.
Measure the AC voltage across the resistor with the
AC voltmeter.
Move the resistor connection to eachexposed metal
part, par ticularly any exposed metal part having a
return path to the chassis, and meausre the AC
voltage across the resistor. Now, reverse the plug in
the AC outlet and repeat each measurement. voltage
measured Any must not exceed 0.75 V AC (r.m.s.).
This corresponds to 0.5 mA AC (r.m.s.).

0.15 F AC TYPE

1500 10W

Good earth ground

AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)

Place this
probe on
each exposed
metal part.

Warning

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.

1-2

CAUTION

!

Important for laser products

MX-J300

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter

lock failed or defeated. Avoid direct exposure to beam.

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

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

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

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

CAUTION

!

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

1-3

MX-J300

Preventing static electricity

1. Grounding to prevent damage by static electricity

Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged,
can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.

2. About the earth processing for the destruction prevention by static electricity

In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of
the work environment.
Be careful to use proper grounding in the area where repairs are being performed.

2-1 Ground the workbench

Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over
it before placing the traverse unit (optical pickup) on it.

2-2 Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(caption)
Anti-static wrist strap

Conductive material
(conductive sheet) or iron plate

3. Handling the optical pickup

1. In order to maintain quality during transport and before installation, both sides of the laser diode on the
replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)

2. Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power
source can easily destroy the laser diode.

4. Handling the traverse unit (optical pickup)

1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.

2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific
details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse
unit. Be careful not to take too long a time when attaching it to the connector.

3. Handle the flexible cable carefully as it may break when subjected to strong force.

4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it

Attention when traverse unit is decomposed

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

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.

1-4

CD traverse

unit

Flexible cable

Fig.1

Soldering

Fig.2

MX-J300

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

Remove the two screws B on both sides of the body.
Remove the metal cover from the body while lifting

up the rear part of the metal cover.

1.

2.

3.

<Main body>

Removing the metal cover

(See Fig.1 to 3)

Disassembly method

Fig.3

Fig.2

Fig.1

Metal cover

A

A

A

Metal cover

B

Metal cover

B

1-5

MX-J300

Removing the CD changer mechanism
assembly (See Fig.4 to 7)

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

1.

Remove the two screws C attaching the CD changer
mechanism assembly on the top of the body.

2.

Disconnect the card wire from connector CN303 on
top of the main board.

3.

Remove the plastic rivet a fixing the main board to
the front panel assembly on the left side of the body.

4.

Remove the two screws D from the rear panel.

5.

Detach upward the rear part of the CD changer
mechanism assembly while pulling the front panel
assembly and the rear panel outward, then pull out
the front part backward and upward.

CD changer
mechanism
assembly

Plastic rivet a

Front panel

assembly

C

Fig.4

CD changer mechanism assembly

Main board

CN303

Rear panel

CN303

CD changer mechanism

Front panel
assembly

Main board

Fig.5

D

Rear panel

Fig.6

assembly

Rear panel

1-6

Pull outward

Pull outward

Main board

Fig.7

Prior to performing the following procedures, remove
the metal cover and the CD changer mechanism
assembly.

Disconnect the card wires from connector CN301,
CN304, CN305 and the harness from CN302 on the
inside of the main board.

Turn over the body and remove the two screws E.
Release the joint b on the bottom of the body and

the joints c and d on both sides of the body using a
screwdriver, and detach the front panel assembly
toward the front.

1.

2.

3.

Removing the front panel assembly

(See Fig.8 to 12)

Fig.10

Fig.9

Fig.8

Fig.11

Fig.12

Main board

Front panel
assembly

Main board

CN301

CN304
CN305

CN302

CN901A,CN901B

E

Front panel
assembly

Joint b

Front panel
assembly

Joint c

Front panel
assembly

Joint d

(Bottom)

MX-J300

1-7

MX-J300

Removing the rear cover and the rear
panel (See Fig.13 to 16)

Prior to performing the following procedures, remove
the metal cover and the CD changer mechanism
assembly.
It is not necessary to remove the front panel
assembly.

1.

Remove the two screws F and the rear cover on the
back of the body.

2.

Remove the four screws G and the six screws H
attaching the main board and the heat sink to the
rear panel.

3.

Remove the screw I attaching the rear panel to the
base chassis.

4.

Release the lower two joints e and f on both sides of
the rear panel using a screwdriver and detach the
rear panel backwards.

Rear cover

G

H

G

Rear panel

FF

Fig.13

(To Earth bracket)

Rear panel

G

Rear panel

H

I

Fig.14

Joint e

Fig.15

1-8

Joint f

Rear panel

Fig.16

Prior to performing the following procedures, remove
the metal cover, the CD changer mechanism
assembly and the rear cover, rear panel.
It is not necessary to remove the front panel
assembly.

Disconnect the card wires from connector CN301,
CN304, CN305 and the harnesses from CN302,
CN901A and CN901B on the inside of the main
board.

From the right side of the body, remove the screw J
attaching the main board to the base chassis.

1.

2.

Removing the main board

(See Fig.17 to 20)

Prior to performing the following procedure, remove
the rear panel.

Remove the two screws K and the screw L attaching
the heat sink to the main board. Remove the IC
bracket 1 and 2 on the back of the heat sink.

Pull out the heat sink toward you.

1.

2.

~To remove the heat sink from

the main board~

Fig.17

Fig.18

J

Rear panel

Main board

Main board

CN301

CN304
CN305

CN302

CN901A,CN901B

Fig.19

Heat sink

K

L

Main board

Fig.20

Heat sink

IC bracket 2

IC bracket 1

MX-J300

1-9

MX-J300

Removing the power transformer
assembly (See Fig.21 to 23)

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

1.

Disconnect the harness from connector CN901A and
CN901B on the inside of the main board.

2.

Cut off the tie band g of the power transformer
assembly and unsolder the power cord.
(Make sure to bundle the wires after repair.)

3.

Remove the four screws M attaching the power
transformer assembly.

When removing the power transformer assembly
with the power cord, remove the rear panel and pull
out the power cord stopper from the bottom chassis
upward.

CN901A,CN901B

Tie band g

Power transformer assembly

Fig.21

M

Tie band g

Tie band g

Rear panel

Power cord stopper

Power transformer

M

Fig.22

Power transformer

assembly

Fig.23

assembly

1-10

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

Disconnect the card wire from connector CN352 on
the cassette amplifier board.

Remove the six screws N attaching the cassette
mechanism assembly.

Detach the cassette mechanism assembly toward
you.

1.

2.

3.

Prior to performing the following procedure, remove
the cassette mechanism assembly.

Disconnect the card wire from connector CN353 on
the cassette amplifier board.

1.

<Front panel assembly>

Removing the cassette mechanism
assembly (See Fig.24)

Removing the cassette amplifier board

(See Fig.25 and 26)

When reconnecting the card wire, put
it pass through under the harness h on
the DC motor (The Flg.27 shows the
details).

ATTENTION:

Unsolder the soldering i on the flexible wire for the
cassette amplifier board head at the bottom of the
cassette mechanism assembly.

Remove the four screws O attaching the cassette
amplifier board on the bottom of the cassette
mechanism assembly.

2.

3.

Fig.24

Fig.25

Fig.26

NN

N

O

O

N

Cassette
mechanism
assembly

Cassette amplifier board

CN352

Cassette amplifier board

Cassette amplifier board

CN352 CN353

Cassette mechanism

board

DC motor

h

Soldering i

R/P head

(Bottom)

MX-J300

1-11

MX-J300

Removing the rolling panel assembly

(See Fig.27 to 29)

P

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

1.

Disconnect the card wire from connector CN704 and
the harness from CN706, CN707 and CN708 on the
display board over the rolling panel.

2.

Remove the four screws P attaching the bracket.

3.

Remove the four screws Q attaching the rolling panel
assembly.

4.

Pull out the rolling panel assembly.

Removing the display board (See Fig.30)

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

Bracket

Q

Q

Rolling panel assembly

CN707

CN706

Display board

Q

Q

Fig.27

1.

Disconnect the card wire from connector CN705 and
the harness from CN703 on the display board.

2.

Remove the two screws R attaching the display
board.

3.

Pull out the display board upward.

Display board

Display board

CN704

R

Fig.28

Fig.29

Display board

CN708

H.phone jack

board

CN703

CN705

1-12

CN703

R

Fig.30

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

Pull out the volume knob on the front of the front
panel assembly and remove the nut attaching the
volume board.

Unhook the two hooks j on the back of the front
panel assembly and detach the volume board.

1.

2.

Remove the three screws T attaching the function
board 2.

Unsolder FW1004 on the function board 2 and
disconnect the harness extending from the eject
switch board.

1.

2.

Remove the two screws S attaching the function
board 1. Detach the function board downwards
while releasing it from the part k.

Unsolder FW1002 on the function board 1 and
disconnect the harness extending from the power
switch board.

1.

2.

Removing each board in the front panel
assembly (See Fig.31 to 33)

~Function board 1~ (Fig.31 and 33)

~Function board 2~ (Fig.31)

~Volume board~ (Fig.31 and 32)

Remove the screw W attaching the headphone
board.

1.

Remove the three screws V attaching the power
switch board.

Unsolder FW1002 on the power switch board and
disconnect the harness extending from the function
board 1.

1.

2.

Remove the four screws U attaching the eject switch
board.

Unsolder FW1004 on the eject switch board and
disconnect the harness extending from the function
board 2.

1.

2.

~Eject switch board ~ (Fig.33)

~Power switch board~ (Fig.31 and 33)

~Headphone board~ (Fig.33)

Fig.31

Fig.32

Fig.33

V

V

S

V

U

U

T

Power switch board

FW1002

Function board 1

(Tape / AWX)

Eject switch board

FW1004

Volume board

FW1002

Function board 2

(Audio / CD)

FW1004

Volume board

Hooks j

V
V

W

S

Function board 1

FW1002

Power switch board

FW1002

Headphone board

Part k

MX-J300

1-13

MX-J300

<Rolling panel assembly>

Prior to performing the following procedures, remove
the metal cover the CD changer mechanism
assembly, the front panel assembly and the rolling
panel assembly.
It is not necessary to remove the display board.

Removing the multi control assembly

(See Fig.34 to 36)

1.

Remove the two screws X on both sides of the multi
control assembly.

2.

Disconnect the card wire from connector CN705 on
the display board.

3.

Pull outwards the joints l on both sides and detach
the multi control assembly toward the front.

Removing the multi control board

(See Fig.37 to 39)

Prior to performing the following procedure, remove
the multi control assembly.

Multi control assembly

Fig.34

X

Multi control assembly

1.

Remove the six screws Y attaching the cover and
the bracket.

2.

Release the hooks m on both sides of the panel
holder attaching the bracket and pull out the panel
holders outward.
Detach the multi control board with the cover and the
bracket attached.

3.

Remove the two screws Z attaching the multi control
board.

Hook m

Bracket

Panel holder

Fig.38

Multi control assembly

CN705

Bracket

Fig.35

X

Joint l

Fig.36

Y

Bracket

1-14

CN705

Multi control board

Z

Fig.39

Y

Y

Cover

Fig.37

MX-J300

Prior to performing the following procedures, remove
the display board.

Remove the two screws A attaching the motor
bracket, then detach the motor leads from the fixing
plate n.

Remove the two screws B attaching the shaft
bracket.

Remove the motor belt.
Pull the parts o on each side of the shaft assembly

outwards and detach the shaft assembly upward.
Detach the drive motor assembly upward.

1.

2.

3.

4.

5.

Removing the drive motor assembly

(See Fig.40 to 41)

Fig.40

Fig.41

BA

Motor bracket

Shaft bracket

Fixing plate n

Shaft assembly Motor belt

Drive motor assembly

Part oPart o

1-15

MX-J300

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 two 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.The two screws B is removed and C.B.holder is detached.

7.Disconnect the connector CN854 on the CD servo
control board.

8.Disconnect the card wire CN601 and the connector
CN801 on the CD servo control board.

A

a

a

CN854

A

CN651

CD servo control board

CN652

CN801

CN601

CN151

Removing the CD tray assembly
(See Fig.2~4)

Remove the front panel assembly.

1.
Remove the CD changer mechanism assembly.

2.
Remove the CD Servo control board.

3.
Remove the screw C retaining the lod stopper.

4.
From the T.bracket section "b" and clamper base

5.
section "c" , remove both of the edges fixing the
rod(See Fig.2 and 3).
Remove the screw D retaining the disc stopper

6.
(See Fig.3).
Remove the three screws E retaining the T.bracket

7.
(See Fig.3).
Remove the screw F retaining the clamper assembly

8.
(See Fig.3).
From the left side face of the chassis assembly, remove

9.
the one screw G 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

D

Earth

wire

B

B

C.B.Holder

Fig.1

Clamper base

b

Rod

c

T.Braket

Fig.2

d

EE

C

a

Lod stopper
(C/J version only)

E

F

b

Lock lever

Fig.4

1-16

Clamper ass'y

Fig.3

Return spring

G

MX-J300

11.

12.

Check whether the lifter unit stopper has been caught
into the hole at the section "e" of CD tray assembly as
shown in Fig.5.
Make sure that the driver unit elevator is positioned as
shown in Fig.6 from to the second or fifth hole on the
left side face of the CD changer mechanism assembly.

Fig.5

Fig.7

Fig.6

Fig.8

Fig.9

[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.

14.

15.

Manually turn the motor pulley in the clockwise
direction until the lifter unit stopper is lowered from the
section "e" of CD tray assembly(See Fig.8).
Pull out all of the three stages of CD tray assembly in
the arrow direction "f" until these stages stop
(See Fig.6).
At the position where the CD tray assembly has
stopped, pull out the CD tray assembly while pressing
the two pawls "g and g' " on the back side of CD tray
assembly(See Fig.9). In this case, it is easy to pull out
the assembly when it is pulled out first from the stage
CD tray assembly.

CD tray
assembly

e

Drive unit of elevator

CD tray assembly

f

Refer to Fig.7

Pawl

Chassis assembly

Pulley gear

Motor pulley

Pawl ,

CD tray assembly

Stopper

g

g

g'

1-17

MX-J300

Removing the CD loading mechanism
assembly(See Fig.10)

1.2.While turning the cams R1 and R2 assembly in the
arrow direction "h" ,align the shaft "i" of the CD loading
mechanism assembly to the position shown in Fig.10.
Remove the four screws H retaining the CD loading
mechanism assembly.

Removing the CD traverse mechanism
(See Fig.11 and 12 )

For dismounting only the CD traverse mechanism

1.
without removing the CD loading mechanism assembly,
align the shaft "j" of the CD loading mechanism
assembly to the position shown Fig.11 while turning the
cam R1 and R2 assembly in the arrow direction "k" .
By raising the CD loading mechanism assembly in the

2.
arrow direction "l", remove the assembly from the lifter
unit

Cam R1, R2 assembly

Cams R1, R2 assembly

Arrow

h

i

H

H

CD loading mechanism assembly

Fig.10

H

H

CD traverse mechanism

Arrow

k

j

Fig.11

Removing the CD pick unit
(See Fig.13 )

1.

Move the cam gear in the arrow direction "m" . Then,
the CD pickup unit will be moved in the arrow direction
"n" .
According to the above step, shift the CD pickup unit to

2.
the center position.
While pressing the stopper retaining the shaft in the

3.
arrow direction "o" , pull out the shaft in the arrow
direction "p".
After dismounting the shaft from the CD pickup unit,

4.
remove the CD pickup unit

Lifter unit

o

Stopper

Shaft

Fig.12

CD Pickup unit

n

m

Shaft

p

Stopper

Fig.13

Arrow

CD loading

mechanism

Shaft

Cam gear

k

1-18

Removing the cam unit
(See Fig.14 ~17 )

1.

Remove the CD loading mechanism assembly.

2.

While turning the cam gear "q", align the pawl "r"
position of the drive unit to the notch position(Fig.16) on
the cam gear "q".
Pull out the drive unit and cylinder gear(See Fig.17).

3.
While turning the cam gear "q", align the pawl "s"

4.
position of the select lever to the notch position(Fig.18)
on the cam gear "q".
Remove the four screws J retaining the cam unit(cam

5.
gear "q" and cams R1/R2 assembly)(See Fig.18).

MX-J300

Chassis assembly

CN801

CN802

Fig.14

Drive unit

Tray select
switch board

Cylinder gear

CN804

Drive unit

r

I

Cam gear q

Cam gear q

Fig.15

J

Cams R1, R2 assembly

Cam unit

Fig.16

J

J

s

Select lever

Fig.17

1-19

MX-J300

Removing the actuator motor and belt
(See Fig.18~21)

1.

Remove the two screws K retaining the gear bracket
(See Fig.19).

2.

While pressing the pawl "t" fixing the gear bracket in the
arrow direction, remove the gear bracket
(See Fig.19).
From the notch "u section" on the chassis assembly

3.
fixing the edge of gear bracket, remove and take out the
gear bracket(See Fig. 20).
Remove the belts respectively from the right and left

4.
actuator motor pulleys and pulley gears(See Fig. 19).
After turning over the chassis assembly, remove the

5.
actuator motor while spreading the four pawls "v" fixing
the right and left actuator motors in the arrow
direction(See Fig. 21).

[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. 22.

Chassis assembly

Pulley gear

Gear bracket

Belt

Motor pulley

K

Fig.18

Actuator motor

Pulley gear
Belt

Motor pulley

K

Pawl

t

u

Gear bracket

Fig.19

Assembly and Configuration Diagram

Pulley gear

Gear B

v

v

Fig.20

Pulley gear

Gear B

Cylinder gear

1-20

Gear C

Select gear

Gross gear L

Fig.21

Gross gear U

Gear C

MX-J300

Fig.22

[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).

Removing the cams R1/R2 assembly
and cam gear q(See Fig.22)

1.

2.

3.

4.

Remove the slit washer fixing the cams R1 and R2
assembly.
By removing the two pawls "w" fixing the cam R1,
separate R2 from R1.
Remove the slit washer fixing the cam gear "q".
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 L retaining the C.G. base
assembly.

Fig.23

Slit washer

Pawl

Cam R2

Slit washer

Cam gear L

Cam switch board

C.G. base assembly

Cam R1

Pawl

Cam gear L

Notch

Cylinder
gear

Gear bracket

Cam R1, R2 assembly

Gear unit

Drive unit

x

Pawl

w

w

L

1-21

MX-J300

< Cassette mechanism section >

Removing the R/P head assembly

(See Fig.1to2)

1.

Unsolder the head wire from the cassette
mechanism board.

2.

Remove the two screws A retaining the R/P head
assembly.

Refer to the figure for soldering

Cassette mechanism board

Sold part

Fig.2

Removing the R/B head assembly

(See Fig.3)

A

A

R/P head assembly

Fig.1

1.

Loosen the screw B attaching the P/B head.

2.

Remove the screws C retaining the R/B head
assembly.

Removing the Pinch roller assembly

(See Fig.4)

1.

Pull the tab a outward and remove the pinch roller
upward.

B

C

Fig.3

Tab a

1-22

Pinch roller

Fig.4

Remove the two screws D attaching the capstan
motor.

Unsolder the motor wire.

1.

2.

Removing the Capstan motor

(See Fig.5 to 7)

Remove the capstan motor.
Remove the capstan belt.
ATTENTION: Do not stain the belt with grease.

1.

2.

Removing the Capstan belt (See Fig.7)

Fig.5

Fig.6

Fig.7

Cassette mechanism assembly

FR belt

D

Capstan motor

Sold part

FR belt

Capstan belt

Marke red line

Motor wire

Capstan motor

Un solder

MX-J300

1-23

MX-J300

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
VT712
VT703

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, TAPE : AC-514

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

: For Tape speed and wow flutter ( 3kHz)
: For Head angle(10kHz),Play back frequency

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)
S,A,BASS : OFF
Sound mode : OFF
Main VOL. : 0 Minimum
Travers mecha set position : Disc 1

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.

1-24

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)

Head azimuth

adjusting screw

(Reverse side)

Playback

head

Playback,recording and eraser

heads or playback head

1.Playback the test tape VT703(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.

<Constant speed>
Adjust the volume inside of capstan motor1 so that
the frequency counter reading becomes 3,000Hz
60Hz when playing back the test tape VT712(3kHz)
with the playback mechanism or playback and
recording mechanism after ending forward winding
of the tape.

Confirmation
of head angle

Confirmation
of tape speed

Test tape
VT703(10kHz)
Measurement
output terminal
:Speaker terminal
Speaker R
(Load resistor:3ohm)
:Headphone terminal

Test tape
:VT712(3kHz)
Measurement
output terminal
:Headphone terminal

Maximum
output

Tape speed
of decks
(A and B)
:3,000Hz
60Hz

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

Volume Inside
of capstan
motor

Items Measurement

conditions

Measurement method

Standard

values

Adjusting

positions

Tape recorder section

MX-J300

1-25

MX-J300

Reference values for confirmation items

Items Measurement

Double tape
speed

conditions

Test tape
:VT703(10kHz)
Measurement
output terminal
:Speaker terminal
Speaker R
(Load resistance:3ohm)
measurement
output terminal
:Headphone terminal

After setting to the double speed motor, confirm
that the frequency counter reading becomes
4,800+400/-300Hz when the test tape VT712
(3kHz) has been play back with the playback
mechanism.

Measurement method

Standard

values

4,800+400/

-300Hz

Adjusting

positions

Playback
mechanism side

Difference
between the
forward and
reverse speed.
P.mecha and
R/P mecha
speed

Wow & flutter

Test tape
:VT703(10kHz)
Measurement
output terminal
:Headphone terminal

When the test tape VT712(3kHz) has been played
back with the playback mechanism or recording and
playback mechanism at the beginning of forward
winding, the frequency counter reading of the
difference between both of the mechanisms should
be 6.0Hz or less.

When the test tape VT712(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).

Reference values for electrical function confirmation items

Items Measurement

Recording
bias frequency

conditions

*Recording and
playback side forward
or reverse
*Test tape
:TYP AC-514
*Measurement
terminal BIAS TP on
P.C.board

1.While changing over to and from BIAS 1 and 2,
confirm that the frequency is changed.

2.With the recording and playback mechanism.
load the test tape (AC-514 to TYP ),and set the
mechanism to the recording and pausing
conditions in advance.

3.Confirm that the BIAS TP frequency on the
P.C.board is 100kHz 6kHz.

Measurement method

60Hz or
less

with in

0.25%
JIS(WTD)

Standard

values
100kHz
+9kHz

-7kHz

Both the playback
and recording &
playback
mechanism

Both the playback
and recording &
playback
mechanism

Adjusting

positions

Eraser current
(Reference
value)

1-26

*Recording and
playback side forward
or reverse
*Recording mode
*Test tape
:AC-514 and AC-225
Measurement terminal
Both of the eraser
head

1.With the recording and playback mechanism,
load the test tapes(AC-514 to TYP and AC-225
to TYP ),and set the mechanism to the recording
and pausing condition in advance.

2.After setting to the recording conditions, connect
1Mohm 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
:120mA
TYP
:75mA

Flow of functional operation until TOC read

Power ON

Play Key

Slider turns REST
SW ON.

Automatic tuning
of TE offset

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

MX-J300

Check Point

Tracking error waveform at TOC reading

Approx.3sec

Tracking
servo
off states

Automatic measurement
of TE amplitude and
automatic tuning of
TE balance

VREF

pin 25 of
IC601(TE)

Approx

1.8V

Disc states
to rotate

Tracking
servo
on states

Disc to be
braked to stop

TOC reading
finishes

500mv/div
2ms/div

Fig.1

Laser ON

Detection of disc

Automatic tuning of
Focus offset

Automatic measurement of
Focus S-curve amplitude

Disc is rotated

Focus servo ON
(Tracking servo ON)

Automatic measurement of
Tracking error amplitude

Automatic tuning of
Tracking error balance

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

Confirm that the Focus error

S-cuve signal at the pin28 of

IC651 is approx.2Vp-p

Confirm that the signal from
pin24 IC651 is 0V as a
accelerated pulse during
approx.400ms.

Confirm the waveform of
the Tracking error signal.
at the pin 25 of IC601 (R604)
(See fig-1)

Automatic tuning of
Focus error balance

Automatic tuning of
Focus error gain

Automatic tuning of
Tracking error gain

TOC reading

Play a disc

Confirm the eys-pattern
at the lead of TP1

1-27

MX-J300

Maintenance of laser pickup

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

(2) Life of the laser diode
When the life of the laser diode has expired,
the following symptoms will appear.

1. The level of RF output (EFM output:ampli
tude of eye pattern) will below.

Is the level of

RFOUT under

1.25V 0.22Vp-p?

YES

O.K

NO

Replace it.

Replacement of laser pickup

Turn off the power switch and,disconnect the
power cord from the AC outlet.

Replace the pickup with a normal one.(Refer
to "Pickup Removal" on the previous page)

Plug the power cord in,and turn the power on.
At this time,check that the laser emits for
about 3seconds and the objective lens moves
up and down.
Note: Do not observe the laser beam directly.

Play a disc.

Check the eye-pattern at TP1.

Finish.

(3) Semi-fixed resistor on the APC PC board The semi-fixed resistor on the APC printed circuit board which is
attached to the pickup is used to adjust the laser power.Since this adjustment should be performed to match the
characteristics of the whole optical block, do not touch the semi-fixed resistor.
If the laser power is lower than the specified value,the laser diode is almost worn out, and the laser pickup should
be replaced.
If the semi-fixed resistor is adjusted while the pickup is functioning normally,the laser pickup may be damaged
due to excessive current.

1-28

Description of major ICs

BA6897FP-W(IC801): 4channel driver

1.Pin layout & Block diagram

GND

CH4-OUTA

CH4-OUTB

CH4-INA

CH4-INB

BIAS IN

28 27 26 25 24 23 22

10K

D.BUF

D.BUF

T.S.D

13.3K

Level shift

10K

10K

Vcc

REGULATOR

Vcc

Vcc

CH3-INB

CH3-INA

CH3-OUTB

CH3-OUTA

21 20 19 18 17 16 15

Vcc

50K

50K

10K

D.BUF

13.3K

Level shift

DRIVER MUTE

OP IN(+)

OP IN(-)

D.BUF

MX-J300

D.BUF

1 2 3 4 5 6 7

CH1-OUTA

2.Pin function
Pin

Symbol

NO.

1

CH1-OUTA

2

CH1-OUTB

3

CH1-INA

4

CH1-INB

5

Tr-B

6

Vreg OUT

7

MUTE

8

GND

9

CH2-INB

10

CH2-INA

11

CH2-OUTB

12

CH2-OUTA

13

GND

14

OPOUT

Level shift

10K

D.BUF

CH1-INA

13.3K

Tr-B

Vreg

CH1-INB

OUT

MUTE

CH1-OUTB

Function

Driver CH1 - output
Driver CH1 + output
Driver CH1 input
Driver CH1 gain adjustment Input terminal
Connect to the base of external Tr
Fixed voltage output
Mute control terminal
GND
Driver CH2 gain adjustment Input terminal
Driver CH2 input
Driver CH2 + output
Driver CH2 - output
Sub-slate GND
Operation amplifier output

13.3K
10K

8 9 10 11 12 13 14

Level shift

D.B U F

GND

CH2-INB

CH2-INA

CH2-OUTA

CH2-OUTB

Pin

NO.

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

Symbol

OP IN(-)
OP IN(+)
CH3-OUTA
CH3-OUTB
CH3-INA
CH3-INB
Vcc
Vcc
BAIS IN
CH4-INB
CH4-INA
CH4-OUTB
CH4-OUTA
GND

Operation amplifier - input
Operation amplifier + output
Driver CH3 - output
Driver CH3 + output
Driver CH3 input
Driver CH3 gain adjustment Input terminal
Pow er supply terminal
Pow er supply terminal
Bias amplifier input terminal
Driver CH4 gain adjustment Input terminal
Driver CH4 input
Driver CH4 + output
Driver CH4 - output
Sub-slate GND

Function

D.B U F

GND

OP-OUT

T.S.D;Thermal shutdown

D.BUF:Drive buffer

1-29

MX-J300

AN8806SB-W (IC601) : RF&Servo AMP

1.Pin layout

PD

LD
LDON

LDP
VCC
RF-
RF OUT
RF IN

C.AGC
ARF
C.ENV

C.EA

CS BDO

BDO
CS BRT
OFTR
/NRFDET

GND

2.Block diagram

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18

36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19

PDAC
PDBD
PDF
PDE
PDER
PDFR
TBAL
FBAL
EF­ EF OUT
TE­ TE OUT
CROSS
TE BPF
VDET
LD OFF
VREF
ENV

6

36

-­+

35

-­+

31

34

--

728

-­+

+

VCBA

--

+

VCBA

--

--

VCBA

+

29

--

+

-­+

27

-­+

910 17

8

AGC

EQ

OFTR

RF
DET

BDO

11

12 19

ENV CURCUIT

13
14

15

16

-­+

20

+

+

32

33

-­+

--

VCBA

+

+

--

-­+

--

--

+

+

--

21

2

+

--

1-30

24 25

30

23

26

22

14

3

35
36

34

33

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

3. Pin function

PD AC

FBAL
TBAL

PDFR
PDER

PDF

PDE

PD BD

TE BPF

VDET

CROSS
TE OUT

TE-

FE OUT

FE-

/NRFDET

GND

LD OFF

VREF

ENV

OFTR

C.AGC

ARF

C.ENV

C.EA

CS BDO

BDO

CS BRT

LD

LD ON

LDP

VCC

RF-

RF OUT

RF IN

PD

Pin No.

Symbol

I/O

I

O

I

--

-­I

O

I

I/O

O
I/O
I/O

I/O

O
I/O

O
O

-­O
O

-­O

I
O
O

I
O

I

I

I

I/O
I/O

I

I

I

I I-V amp input

I-V amp input
I-V amp input

I-V amp input

E I-V amp gain control

F I-V amp gain control

Tracking balance control

Focus balance control

Inverse input pin for focus error amp

Output pin of focus error

Inverse input pin for tracking error amp

Tracking error signal output

Tracking error cross output

Input pin of tracking error through BPF

Vibration detection signal output

Connect to ground

Reference voltage output

Description

APC amp input terminal
APC amp output terminal
APC ON/OFF control terminal

Envelope output

Ground

RF detection signal output

Of-track status signal output

BDO output pin

A capacitor is connected to this terminal to detect the envelope of RF signal

RF output

Connecting pin of AGC loop filter

RF input

RFamp output

Inverse input pin for RF amp

Power supply

Connect to ground

A capacitor is connected to this terminal to detect the envelope of RF signal

A capacitor is connected to detect the lower envelope of RF signal

A capacitor is connected to detect the lower envelope of RF signal

MX-J300

1-31

MX-J300

BA15218F(IC303):OP AMP.

1OUT1

2-IN1

-

8

7

VCC

OUT2

1

3+IN1

+

-

-IN2

6

2

EE

4

+

5V

+IN2

BA3126N(IC31) : R/P Switch

S W

R E C

G

123456789

P / B

S W

C O N T .

G N D

V c c

P / B

G

S W

S W

R E C

TA8409S(IC851,IC852):Motor driver

1.Pin layout 2.Pin function

1

IN2

VCC

OUT 2

GND
GND

VS

OUT 1

VR

IN1

2
3
4
5
6
7
8
9

TA8409S

INPUT OUTPUT MODE

IN1

IN2

0

0

1

0

0

1

1

1

OUT1

H

L
L

OUT2

L

H

L

MOTOR

STOP
CW/CCW
CCW/CW

BRAKE

1-32

LC72136N (IC2) : PLL Frequency synthesizer

1. Pin layout

FM/AM

CLOCK

FM/ST/VCO

AM/FM

2. Block

XT

CE

DI

DO

SDIN

1
2
3
4
5
6
7
8
9
10
11

22
21
20
19
18
17
16
15
14
13
12

XT
GND
LPFOUT
LPFIN
PD
VCC
FMIN
AMIN

IFCONT
IFIN

MX-J300

3. Function

Pin

Symbol

No.
1

FM/AM

2
3

4

CLOCK

5
6

FM/ST/VCO

7

AM/FM

8
9
10
11

1

22

16

15

3

4
5

6

17

21

XT

CE

DI

DO

LW

MW

SDIN

Reference

Driver

Swallow Counter

1/2

C

2B

I/F

Power

on

Reset

Function

I/O

X'tal oscillator connect (75kHz)

I

LOW:FM mode

O

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

I

Swallow Counter

1/16,1/17 4bit

1/16,1/17 4bit

12bit

Programmable

DriverS

Data Shift Register & Latch

7821113

6pin(output): H
Input for receive the serial data from

I

controller
Sync signal input use

I

Data output for Controller

O

Output port
"Low": MW mode

O

Open state after the power on reset

O

Input/output port

I/O

Input/output port

I/O

Data input/output

I/O

Phase

Detector

Charge Pump

Unlock

Detector

Universal

Counter

Pin
No.

12
13
14

15

16
17

18

19
20
21
22

Symbol

IFIN

IFCONT

AMIN

FMIN

VCC

PD

LPFIN

LPFOUT

GND

XT

18
19

20

12

I/O

Function
IF counter signal input

I

IF signal output

O

Not use

-

AM Local OSC signal output

I

FM Local OSC signal input

I

Power suplly(VDD=4.5-5.5V)

­When power ON:Reset circuit move
PLL charge pump output(H: Local OSC

O

frequency Height than Reference frequency.
L: Low Agreement: Height impedance)
Input for active lowpassfilter of PLL

I

Output for active lowpassfilter of PLL

O

Connected to GND

­X'tal oscillator(75KHz)

I

1-33

MX-J300

MN35510 (IC651) : DIGITAL SERVO&DIGITAL SIGNAL PROCESSER

1. Terminal Layout

2.Block Diagram

LRCKIN(MSEL)
BCLK(SSEL)
SRDATAIN
(PSEL)

IOSEL

CLVS
CRC
BLKCK
CLDCK
SBCK
SUBC
DEMPH
RESY
FLAG6(RESY)

SSEL
SQCK
SUBQ
AVDD2

AVDD2

PCK
EFM
PLLF
DSLF
IREF
DRF
ARF
RSEL
PSEL

MLD
MCLK
MDATA

CK384(EFM)
VCOF
BYTCK
SMCK
FCLK
CSEL
MSEL
X2
X1

ÊSTAT

DIGITAL
DEEMPHSIS

SUB
CODE
BUFFER

DSL.
PLL
VCO

VCO

ITUNING
GENERATION
PITCH
CONTROL

20 ~ 1

21

~

40

41 ~ 60

8TIMES
OVER SAMPUNC
DIGITAL FILTER

EFM
DEMODULATION

SYNC
INTERPOLATION

SUBCODE
DEMODULATION

MICRO
COMPUTER
INTERFACE

A/D

COVERTER

80

~

61

1BIT
DAC
LOGIC
S

16k
SRAM

CIRC
ERROR
CORRECTION
DEINTERLEVE

CLV
SERVO

INPUT

PEM
(R)

PEM
(L)

D/A
CONVERTER

OUTPUT

DIGITAL
AUDIO
INTERFASE

DIGITAL
AUDIO
INTERFASE

INTER POLATION
SOFT MUTING DIGITAL
ATTENUATION
PEAK DETECTIVE
AUTO CUE

PORT

SERVO
TIMING GENERATOR

AVSS1
AVDD1
OUTR

OUTL

FLAG
IPFLAG

TX

ECM

PC

LRCK
SRDATA
BCLK
DMUTE

TRKV
KICK
VREF
TRVSTR
ECS
TVD
TRD
FOD
TBAL
FBAL
TOFS
TES
/TLOCK
/FLOCK
PLAY
LDON
WVEL
SENSE

1-34

D

/

D

V

V

V

S

D

D

S

D

D
1

/

R

V

T

S

S

E

T

S

S

1

T

F
E

R

T

F

E

E
N
V

T
R
C
R
S

B

V

D

D

O

E
T

/
R
F
D
E

O
F
T

3. Description

Pin
No.

1
2
3
4
5
6

7

8

9
10
11

12
13
14
15
16

17

18
19
20

21
22
23

24

25
26

27

28

29

30
31
32
33

34
35

36

37

38

39

40

symbol

BCLK

LRCK
SRDATA
DVDD1

DVSS1

TX

MCLK

MDATA
MLD
SENSE
FLOCK
TLOCK
BLKCK
SQCK
SUBQ
DMUTE

STATUS

RST
SMCK
PMCK

TRV
TVD
PC

ECM

ECS
KICK

TRD
FOD

VREF

FBAL
TBAL
FE
TE
RF ENV
VDET
OFT
TRCRS
RFDET
BDO
LDON

I/O

O
O
O

O

O

O

Description

Not used
Not used

Not used

I

Power supply (Digital)

I

Connected to GND
Digital audio interface output

com command clock signal input

I

(Data is latched at signal's rising point)

com command data input

I
I

com command load signal input

Not used

O

Not used
Not used

sub-code block clock signal output

O

I

Outside clock for sub-code Q resister input
Sub-code Q -code output

O

I

Connected to GND
Status signal

O

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

Reset signal input (L:Reset)

I

I

Not used

I

Not used

O

Traverse enforced output

O

Traverse drive output

I

Not used

Spindle motor drive signal (Enforced

O

mode output) 3-State

Spindle motor drive signal (Servo error

O

signal output)

Kick pulse output

O

Tracking drive output

O
O

Focus drive output

Reference voltage input pin for D/A

I

output block (TVD,FOD,FBA,TBAL)
Focus Balance adjust signal output

O

O

Tracking Balance adjust signal output

Focus error signal input(Analog input)

I

Tracking error signal input(Analog input)

I
I

RF envelope signal input(Analog input)

Vibration detect signal input(H:detect)

I

Off track signal input(H:off track)

I

Track cross signal input

I

RF detect signal input(L:detect)

I

BDO input pin(L:detect)

I

Laser ON signal output(H:on)

O

Pin
No.

41

42
43
44
45
46

47

48

49
50
51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74
75

76

77

78

79

80

symbol

TES
PLAY

WVEL
ARF
IREF
DRF

DSLF

PLLF
VCOF
AVDD2

AVSS2

EFM

PCK
PDO

SUBC
SBCK

VSS

XI
X2

VDD

BYTCK
CLDCK

FCLK

IPPLAG

FLAG

CLVS

CRC

DEMPH

RESY

IOSEL

TEST

AVDD1

OUT L

AVSS1

OUT R

RSEL
CSEL

PSEL

MSEL

SSEL

I/O

Tracking error shunt signal output(H:shunt)

O

I

Not used

I

Not used

I

RF signal input
Reference current input pin

I

Bias pin for DSL

I

I/O

Loop filter pin for DSL
Loop filter pin for PLL

I/O

I

Not used

I

Power supply(Analog)
Connected to GND(Analog)
Not used

III

Not used

I

Not used

I

Not used

I

Not used
Connected to GND(for X'tal oscillation

I

circuit)

Input of 16.9344MHz X'tal oscillation circuit

I

Output of X'tal oscillation circuit

O

I

Power supply(for X'tal oscillation circuit)

I

Not used

I

Not used

I

Not used

I

Not used

I

Not used

I

Not used

I

Not used
Not used

I

Not used

III

pull up

pull up

Power supply(Digital)

Lch audio output

O

I

Connected to GND
Rch audio output

O

II

pull up
Connected to GND

I

Connected to GND

I

Connected to GND

I

Pull up

Description

MX-J300

1-35

MX-J300

UPD78055GCA37 (IC251):CD Changer control

1. Terminal Layout

20 ~ 1

2. Pin function

Pin

symbol

No.

DEMPH

1

DEMPHO

2

OS OFF

3

AVSS

4

MCS

5
6

MRDY

7

AVREF1

8

KCMND

9

MSTAT

10

KCLK

11

SUB

12

RST

13

SQCK

14

DMUTE

15

MREQ

16

VCDEMP

17

SRDATA

18

SRCLK
CAM0~7

19~26

27~29

1~3SSW

30~32

3~1MSW

VSS

33
34

DISC

35

SHIFT

36

MNT

37

MNT1

38

MNT2

39

VCORST

40

LMUP

21

~

40

41 ~ 60

I/O

Deemphasis input

I

Deemphasis output

O

On screen display on/off

I

-

Connected to GND

Mode control select

I

SUB Ready

I

AV reference

­SVC3 Serial data out put

O

SVC3 Status input input

I

SVC3 Serial clock input

I

Sub-code Q code output

O

Reset signal input (L : Reset)

I

Outside clock for sub-code Q resister input

I

Digital mute

O

Not used

-

Not used

-

Not used

Not used

-

CAM SW input

I

Sub tray SW input

I

Sub tray SW output

I

-

Connected to GND

I

Disk sensor
Test mode(Not used)

I
I

Test mode(Not used)
Test mode(Not used)

I

Test mode(Not used)

I

Not used

-

O

L CAM up

Description

80

61

~

Pin
No.

41
42
43
44

45
46

47

48~59

60
61
62

63

64
65

66

67

68

69
70

71

72

73

74
75

76

77

78

79
80

Symbol

LM DOWN
RM UP
RMDOWN
CHECK
CHECK1
CHECK2

CHECK3

RESET
STAT

HREG

HRDY
DRMUTE
MCLK

MDATA
MLD

VDD

X2

X1
IC
XT2
REST
AVDD

AVREF
SSEL
MSEL

PSEL

IOSEL
P ON

I/O

O

L CAM down

O

R CAM up

O

R CAM down

Not used

I
I

Not used
Not used

I
I

Not used
connected to GND

I

VC3 reset out

I

Statues signal

O

Not used

I

Not used

O

BTL Driver mute
com command clock signal input

I

I

com command data input
com command lode signal input

I

-

Power supply (for X' tal Q oscillation circuit)

Out of X' tal oscillation circuit

O

Input of 16.9344MHz X' tal oscillation circuit

I

connected to GND

­Not used

-

I

Rest SW input

-

A/D converter power supply

-

Digital GND

-

Not used

-

Not used

-

Not used
Data select out

O
O

Power ON/OFF

Description

1-36

MX-J300

VICTOR COMPANY OF JAPAN, LIMITED

AUDIO & COMMUNICATION BUSINESS DIVISION
PERSONAL & MOBILE NETWORK B.U. 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

No.20818

Printed in Japan
200007(V)