JVC CAMXJ-100 Service manual

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MX-J100

MX-J100

POWER

TIMER

SLEEP

ON/OFF

SOUND

ACTIVE

PROGRAM

REPEAT

MODE

BASS EX.

/SET

TAPEA/B

CD

TUNING MODE FM MODE

TAPE

FM/AM AUX

CD

DISC SKIP

VOL.

+

FADE

MUTING

VOL.

–

RM–SMXJ100J

REMOTE CONTROL

Contents

SP-MXJ100

COMPACT

DIGITAL AUDIO

CA-MXJ100

STANDBY

POWER

COUNTER

CLOCK/TIMER

RESET

DEMO

ACTIVE BASS EX. SOUND MODE

PROGRAM/SET

PHONES

REPEAT

COMPU

PLAY

CONTROL

FULL-LOGIC CONTROL

CD1CD2CD

PLAY & EXCHANGER

AUX FM/AM

CD TAPE

-

TUNING TUNING +

PRESET

+

–

PLAY REC/PLAY

CD SYNCHRO RECORDING

SP-MXJ100

OPEN / CLOSE

DISC CHANGE

3

COMPACT

DIGITAL AUDIO

VOLUME

+

–

CD REC
START

TAPE A/B

REC/PAUSE

A B

DUBBING

EJECTEJECT

Area Suffix

J
C

U.S.A.

Canada

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

COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.

1-2
1-3
1-4
1-5
1-19

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

1-23
1-24
1-24
1-25

No.20817

Jun. 2000

MX-J100

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

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

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

0.15 F AC TYPE

1500 10W

Good earth ground

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

Place this
probe on
each exposed
metal part.

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-J100

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 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-J100

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 CD mechanism assembly is decomposed

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

CD changer unit

1. Remove the CD changer unit.

2. Remove the CD changer mechanism.

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

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

1-4

Card wire

Picup unit
connector

Soldering

Fig.2

Fig.1

CD changer
mechanism

Card wire

Picup unit
connector

MX-J100

Disassembly method

<Main body>

Removing the top cover and the side
covers (See Fig.1 to 3)

1.

Remove the three screws A on the back of the body
and the two screws B on both sides of the body.

2.

Remove the top cover upward from behind.

3.

Remove the two screws C attaching the side covers
on the back of the body and the six screws D on
both sides.

4.

Slide the right and left covers backward and unhook
the two hooks a in the lower part of the side covers
as shown in Fig.2-2.

Hook

A

C

Side cover(L)

A

Fig.1

Top cover

Top cover

A

C

Side cover(R)

B

Hook

Side cover(R)

D

D

B

Hooks a

Fig.2Fig.2-2

Top cover

D

D

D

Hooks a

Fig.3

Side cover(L)

D

1-5

MX-J100

Removing the CD Tray fitting

(See Fig. 4 to 6)

Prior to performing the following procedure, remove
the top cover and the side covers.

ATTENTION:

Be sure to remove the CD tray fitting
before removing the CD changer unit.

1.

Press the POWER button. Press the OPEN/CLOSE
button to eject the CD tray.

2.

Move the CD tray fitting upward and release the joint
b.

3.

Press the OPEN/CLOSE button to insert the tray.

Removing the CD Tray fitting

(See Fig. 5 to 7)

CD tray

OPEN/CLOSE button

POWER button

Fig.4

Joint b

CD tray fitting

- How to eject the CD tray without turning on power -

1.

Turn the black loading pulley gear marked c from the
back of the CD changer unit as shown in Fig.7 and
draw the CD tray toward the front.

2.

Move the CD tray fitting upward and release the joint
b.

3.

Push and insert the CD tray manually.

Joint b

Fig.5

CD tray

Marked c
Loading pulley gear

1-6

This slot of the board.

Fig.7

Fig.6

MX-J100

Removing the CD changer unit

(See Fig.8 to 10)

Prior to performing the following procedure, remove
the top cover, the side covers and the CD Tray
fitting.

1.

Disconnect the card wire from connector SCW1 of
the CD servo board on the back of the CD changer
unit.

2.

Disconnect the harness from connector FW2 on the
inner side of the mother(main) board in the body.

3.

Remove the two screws E attaching the CD changer
unit on the back of the body.

4.

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

CD servo board

SCW1

Mother(main) board

Fig.8

CD changer unit

FW2

E

Rear panel

Front panel assembly

Fig.9

CD changer unit

Rear panel

Fig.10

1-7

MX-J100

Removing the front panel assembly

(See Fig.11 to 13)

Front panel assembly

Mother (main) board

Prior to performing the following procedure, remove
the top cover, the side covers, the CD Tray fitting
and the CD changer unit.

There is no need to remove the rear panel.

1.

Disconnect the harness from head wire connector
DW1 and DW2 on the inner side of the mother
(main) board in the body.

2.

Disconnect the harness from connector HCW1 of the
headphone board on the right side of the body.

3.

Remove the three screws F attaching the front panel
assembly on both sides of the body.
Remove the screw V attaching the earth terminal
extending from the front compartment.

4.

Remove the screw G attaching the front panel
assembly on the bottom of the body.

5.

Release the two joints d on both sides and two joints
e on the bottom of the body using a screwdriver. At
the same time, disconnect the front compartment
from connector CCW1 and CCW2 of the
mother(main) board.

Joint d

F

earth wire

CCW1

CCW2

DW2

DW1

V

Fig.11

Front panel assembly

F

Headphone board

HCW1

Mother (main) board

Fig.12

Joint e

Fig.13

G

F

Joint d

Joint e

1-8

MX-J100

Prior to performing the following procedure, remove
the top cover, the side covers, the CD Tray fitting
and the CD changer unit.

There is no need to remove the front panel
assembly.

Remove the seven screws H attaching the
mother(main) board and the tuner board to the rear
panel on the back of the body.

Remove the three screws I attaching the heat sink
to the rear panel on the back of the body.

Remove the three screws J attaching the rear panel
on the back of the body.

1.

2.

3.

Removing the rear panel (See Fig.14)

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

Disconnect the harness from connector HCW1 of the
mother(main) board on the right side of the body.
Release the harness from the clamp in the body.

Disconnect the harness from head wire connector
DW1 and DW2 extending to the mother(main) board
in the body.

Disconnect the harness from connector RCW1 of the
power transformer.

Remove the screw K attaching the earth terminal to
the base chassis.

Disconnect connector CCW1 and CCW2 connected
to the mother(main) board from the front
compartment (The mother(main)) board will be
detached with the tuner board and the assembly.

1.

2.

3.

4.

5.

Removing the mother(main) board

(See Fig.15 and 16)

Fig.14

Fig.15

Fig.16

H

Rrear panel

H

H

J

J

I

Front panel assembly

Mother (main) board

Headphone board

HCW1

Mother (main) board

Heat sink

Tuner board

DW2

DW1

CCW2

CCW1

Power transformer

RCW1

K

Clamp

1-9

MX-J100

Removing the heat sink

(See Fig.17 and 18)

Prior to performing the following procedure, remove
the mother(main) board.

1.

Remove the three screws L attaching the heat sink
cover plate.

2.

Remove the two screws M attaching the power IC to
the heat sink and the three screws N attaching the
heat sink to the mother (main) board.

Removing the tuner Board

(See Fig. 18 to 20)

The tuner board can be removed even if the
mother(main) board is attached.

1.

Release the joint tab f of the tuner board holder and
the mother(main) board, and disconnect connector
FW1 connected to the mother(main) board. Remove
the tuner board assembly (Refer to Fig.18).

2.

Remove the screw O attaching the tuner board
holder. Release the two tabs g outward and remove
the tuner board from the holder.

Removing the power transformer

(See Fig .21)

Prior to performing the following procedure, remove
the top cover and the side covers.

Heat sink cover plate

Tuner board

Heat sink cover plate

Heat sink

Fig.17

Joint tab f

N

Fig.18

L

M

FW1

Mother(main) board

Mother(main) board

1.

Disconnect the power cord from connector RCW2 of
the power transformer.

2.

Disconnect the harness from connector RCW1 of the
power transformer.

3.

Remove the four screws P attaching the power
transformer and the screw Q attaching the earth
terminal.

ATTENTION:

RCW1

1-10

Prior to disconnecting the power cord
from the body, remove the rear panel.

Q

P

Power transformer

Fig.21

P

RCW2

Power cord

Tuner board

FW1

O

Tuner board holder

Fig.19

Tuner board

Fig.20

Tab g

Tab g

MX-J100

Prior to performing the following procedure, remove
the power / CD switch board.

Pull out the volume knob toward the front.

Disconnect the card wire from the mechanism board
of the cassette mechanism assembly.

Remove the nine screws S attaching the system
board.

1.

2.

3.

Removing the system board

(See Fig.22 and 23)

Remove the three screws R attaching the power /
CD switch board and release the three tabs h
outward.

Disconnect the harness from connector UCW2 of the
power / CD switch board.

1.

2.

Prior to performing the following procedure, remove
the top cover, the side covers, the CD tray fitting and
the front panel assembly.

Removing the power / CD switch board

(See Fig.22)

Disconnect the card wire from the mechanism board
of the cassette mechanism assembly.

Remove the seven screws U attaching the cassette
mechanism assembly.

1.

2.

Removing the cassette mechanism
assembly (See Fig.25)

<Front panel assembly>

Remove the system board temporarily and remove
the screw T attaching the headphone board. Pull out
the headphone board.

1.

Removing the headphone board

(See Fig.24)

Fig.22

Fig.23

Fig.24

Fig.25

Tab h

Power / CD
switch board

R

S

Headphone
board

Tab h

Tab h

Cassette mechanism assembly

UCW2

R

S

S

S

S

S

System board

Mechanism board

Front panel assembly

Volume knob

Headphone board

T

Cassette mechanism assembly

Mechanism board

U

U

U

U

1-11

MX-J100

<CD changer unit>

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

Removing the CD tray (See Fig.26 to 28)

1.

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

2.

Disconnect the card wire from connector SCW5 of
the CD servo board on the upper side of the CD
changer unit.

3.

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

Loading pulley gear marked c

CD tray

CD tray

Fig.26

Reinstall the CD tray (See Fig.29 to 30)

1.

Align the gear-cam with the gear-tray as shown
fig.29, then mount the CD tray.

2.

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

Gear-cam

Gear-tray

Fig.27

Tray stopper marked i

CD tray

Tray stopper marked i

CD servo board

SCW5

Fig.28

Gear-convert

Gear-convert

1-12

Gear-tray

Gear-cam

timing point

Gear-tray

CD tray

Fig.29 Fig.30

Gear-synchro

Removing the sensor board / the tray
motor (See Fig.31 to 33)

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

1.

Release the two tabs j attaching the sensor board on
the under side of the CD tray.

2.

Disconnect the harness from connector CW1 on the
sensor board and release the harness from the two
hooks k. Remove the sensor board.

3.

Remove the screw W attaching the tray turn table.
Detach the tray turn table from the tray.

4.

Pull outward the tab marked m attaching the tray turn
table motor assembly on the upper side of the tray
and detach the tray turn table motor assembly from
the tray.

Hooks k

MX-J100

Tab j

CW1

Tab j

Sensor board

Fig.31

Tray turn table

Tray

Tray turn table motor assembly

W

Fig.32

Tab m

Fig.33

1-13

MX-J100

Removing the belt, the CD servo board
and the switch board (See Fig.34 and 35)

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

1.

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

2.

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

3.

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

4.

Remove the two screws X attaching the CD servo
board. First release the n side of the two tabs n and
two tabs o attaching the CD servo board motor to
raise the CD servo board slightly, then release the o
side.

If the tabs n and o are hard to release, it is
recommendable to unsolder the two soldered parts
on the motor terminal of the CD servo board.
Disconnect the terminal CW3 connected to the
switch board and remove the CD servo board.

Tabs p

CD changer unit

Fig.34

X

CD servo board

Tabs o

Belt

Soldered parts

Motor

Tabs n

5.

Release the three tabs p attaching the switch board
outward and detach the switch board.

Switch board

CW3

Pickup unit connector

Fig.35

CD mechanism board

motor connecter

1-14

Removing the CD mechanism holder
assembly (mechanism included)

(See Fig.36 to 39)

1.

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

2.

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

3.

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

MX-J100

Motorconnecter

CD changer unit

CD mechanism assembly

Pickup unit connector

Fig.36

Lift up slide shaft

Y

Stopper

CD mechanism holder assembly

Fig.37

Lift up slide shaft r

CD mechanism holder assembly

Fig.39

CD mechanism holder assembly

Fig.38

1-15

MX-J100

<CD mechanism section>

Removing the CD mechanism holder from the CD
chassis to remove the CD mechanism.
(Refer to "Removing the CD mechanism holder
assembly" (Pag.2-11))

Removing the pickup unit.

1. Loosen the two screws A fixing the chassis.(Fig.1)

2. Removing the feed gear stopper c on the
bottom of the mechanism and pull out the gear.
(Fig.1, Fig.3, Fig.4)

3. Pull out the shaft by opening the pickup shaft
stopper outward to unlock.(Fig.1, Fig.2)

4. Removing the pickup unit.(Fig.1)

Removing the motor board.

1. Unsolder the motor terminal on the motor board.(Fig.3)

2. Remove the moter board.(Fig.3)

Removing the feed motor.

Remove the two motor fixing screws at B and
removing the feed motor.(Fig.1, Fig.3)

Removing the spindle motor.

The spindle motor cannot be removed as a single unit.
When removing the spindle motor, change the chasis
and turntable together as aunit.(Fig.5)

Stopper

A

A

Stopper

Shutter

Pickup unit

B

Fig.1

Fig.2

Shaft

Feed Gear

Shaft

Screw

W

Turn table

Screw

Spindle motor

Motor board

Feed motor

Spindle motor

Unsolder

c

Unsolder

Fig.3

1-16

B

Chassis

(Feed gear stopper)

Fig.4Fig.5

MX-J100

<Cassette mechanism section>

• Removing the record/playback mechanism.

Removing the R/P head.

1. Remove the screw A on the right side of the
R/P head.(Fig.1, Fig.2)

2. Remove the screw B on the left side of the
R/P head.(Fig.1, Fig.2)

Remove the erase head.

Remove the screw C fixing the erase head.(Fig.1)

Removing the pinch roller.

1. Pull out the pinch roller by opening the pinch
roller stopper outward to unlock .(Fig.3)

2. When reassembling the pinch roller, refer to
fig. 4 to hook up the spring.

R/P Head

E. Head

Stoppsr

A

B

C

Fig.1

B

Pinch roller
assembly

A

Spring

Pinch roller

Return spring

R/P Head
Fig.2

Pinch roller

stopper

Fig.3

Pinch roller

Pinch roller

spring

Return spring

Return spring

Fig.4

1-17

MX-J100

Removing the motor.

1. Remove the two screws D fixing the motor.
Be careful to grease's splash when the

drive belt comes off.(Fig.5, Fig.6)

2. Unsolder the motor terminal.(Fig.5)

Removing the mechanism board.

1. Unsolder the four parts a on the solenoid

coil terminal.(Fig.5)

2. Remove the two screws E fixing the board.(Fig.5)

3. Unhook the three parts b from the board.(Fig.5)

4. Remove the mechanism board.(Fig.5)

Removing the flywheel.

Remove the cut-washers at c and d from the

capstan shaft, then remove the flywheen.
When reassembling the flywheel,
be sure to use new washers as they
cannot be reused.(Fig.8, Fig.9)

a

E

Drive belt

Mecha.

board

b

Motor

Motor

terminal

D

D

Fig.5

Drive belt

Fig.6

E

Drive belt

Motor

b

a

1-18

Sleeve

Flywheel

c

Washer

Sleeve

d

FR belt

Capstan

washer

Flywheel

Fig.7

FR belt

Fig.8Fig.9

Capstan

washer

Flywheel

*

TESTER

MAIN
PCB

VT GND

Ajustment method

Tuner

MX-J100

ITEAM

Received FREQ.

Adjustment
point

Output

Adjustment Location of Tuner PCB

AM(MW) OSC Adjustment

520~1720 KHz

Adjustment

Non-

1~7.0±0.5V

590 KHz

AM(MW) RF Adjustment

MW -ANT

Maximum Output(Fig1-4)

Fig 1-4 OSC Voltage

1-19

MX-J100

FM THD Adjustment

SSG FREQ.

98 MHz

Adjustment
point

FM DETECTOR COIL

(TL3)

Output

60 dB

Minumum Distortion (0.3% below)
(Figure 1-1)

FM Search Level Adjustment

SSG FREQ.

Adjustment
point

(TSR1)

Output

BEACON
SENSITIVITY
SEMI-VR(20K½)

28 dB(±2dB)

98 MHz

Output
GND

FM S.S.G

FM
Antenna
Terminal

Speaker
Terminal

SET

Input

output

Distortion Meter

Figure1-1 IF CENTER and THD Adjustment

FM Antenna

SET

FM IN

FM S.S.G

28 dB

GND

Oscilloscope

Input

Adjust TSR1 so that “TUNED” of FL T
is lighted (Figure 1-2)

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

AM(MW) I.F Adjustment

SSG FREQ.

Frequency

450 kHz

520 kHz

Adjustment
point

AM I.F COIL

(TL2)

Maximum output (Figure 1-3)

Figure1-2 FM Auto Search Level Adjustment

60cm

OUTPUT

AM SSG
450KHZ

INPUT

AM ANT
IN

Speaker Terminal

OUTPUT

VTVM Oscilloscope

Figure1-3 AM I.F Adjustment

20 k½

TL2

1-20

(GND)

VTVM

1. To adjust tape speed

1) Measuring tape: VT 712 (or equivalent)

(Tapes recorded with 3kHz)

2) Connect the cassette deck to the frequency counter
as in figure 1-5.

Notes

NOR
SPEED
Control

1

OUT
(connected
to the frequency
counter)

Turn UVR2 to
left and right
(FRONT PCB)

3KHz

Remark

Standard

To Adjust

Pre-Setup

Item

Step

Pre-Setup
Condition

1) Deck A:VT 712

2) Press PLAY
SW button

3) Deck B:Same
as above

Cassette Deck

output

SPK OUT

Frequency Counter

Figure 1-5

Figure 1-6

SPK OUT

Recording /Play head

FWD PLAY

REVERSE PLAY

AZIMUTH control screw

Figure 1-7

In Out

Cassette Deck

Oscilloscope

±1%
range

Figure 1-8

Audio OSC.

SET
(MAIN PCB)

Oscilloscope

AUX IN

LINE OUT

VTVM

IN

DW2

IN OUT

TP

Cassette deck

MX-J100

1-21

MX-J100

2. To adjust playback lebel/REC

Notes

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

2) Measuring tape :
i) VT 705(or equivalent 12.5kHz AZIMUTH control)

3) The cassette deck is connections as shown in figure 1-7.

1 Adjust Deck A Play Level

Step

Item

Pre-Setup
Condition

Pre-Setup

To Adjust

Standard

Remark

After putting VT705

TP1 OUT

AZIMUTH

1

Adjust Deck B Play Level/REC BIAS

2

Step

1

2

Item

AZIMUTH

Recording
Bias
Voltage

(VTVM is
connected to
the scope)

Pre-Setup
Condition

TP1 OUT
(VTVM is
connected to
the scope)

Fig 1-8

into Deck A

- Press FWD PLAY
button.

After putting VT705
into Deck B

1)Press FWD PLAY
button.

2)Press REV PLAY
button.

After putting MTT­5512 into Deck B

1)Press REC PLAY
button.

2)MAIN PCB DCW2,
connectted to VTVM

Pre-Setup

- Turn the control
screw to as shown
in Figure 1-6.

To Adjust

- Turn the control
screw to as shown
in Figure 1-6.

Turn DVR1,DVR2

to the right and left

Max output
and same phase
(both channels)

Standard

Max output
and same phase
(both channels)

7V(±0.5V)

After
adjustment
secure it with
REGION
LOCK.

Remark

After
adjustment
secure it with
REGION
LOCK.

1-22

Flow of functional operation until TOC read

Power ON

Play Key

RESET a CD LSI

Confirm that the voltage at the pin38
of KB9223(IC922) is "L" "H".

MX-J100

Check Point

LIMIT SW ON

SET Default value of
TE gain, TE balance

Automatic adjusting of

focus bias

Automatic adjusting of

FE offset

Automatic adjusting of

TE offset

LASER power ON

Detection of disk

Confirm that the voltage at the pin41
of KB9223(IC922) is "H" "L" "H".

Confirm that the voltage at the
pin70 of KB9223(IC922) is 3.5V.

Tracking error waveform at TOC reading

Pin 54 of
KB9223/TE
(IC922)

Approx

0.4V

2.50V

Disc states
to rotate

Approx.3.7sec

Disc is rotated

Automatic adjusting of

TE balance

Automatic adjusting of

TE gain

TOC reading

Play a disc

Confirm that the signal from pin46
of KB9223(IC922) is 3.5V as a
accelerated pulse during
approx.1.96s.

Confirm the waveform of
the Tracking error signal
at the pin 54 of KB9223(IC922).

Confirm the eye-pattern
at the pin74 of KB9223(IC922).

1-23

MX-J100

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

1.1V

0.2Vp-p?

YES

O.K

NO

Replace it.

Replacement of laser pickup

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

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

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

Play a disc.

Check the eye-pattern at TP1.

Finish.

(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.

1-24

Description of major ICs

LC75341 (FIC1):Function

MX-J100

1-25

MX-J100

LC72131D (HIC1) : PLL

XIN

XOUT

FMIN

AMIN

CE

DI

CL

DO

VDD

Vss

22

16

15

17

21

1

1/2

3

4

5

6

C2B

1/F

P0WER

ON

RESET

REFERENCE
DIVIDER

SWALLOW COUNTER

1/16, 1/17 4D1ts

12bita PROGRAMMABLE

DIVIDER

DATA SHIFT REGISTER

LATCH

PHASE DETECTOR
CHARGE PUMP

UNLOCK

DETECTOR

UNIVERSAL

COUNTER

18

19

20

12

PD

AIN

ADUT

IFIN

STK402-040 (AIC1)

7 8 9 10

BO1 BO2 BO3 BO4

11

IO1

13

IO2

1-26

LA1837 (TIC1) : FM IF/DET AM RF/IF/DET

MX-J100

1-27

MX-J100

KS9286B (IC928) : DSP/D-A Converter

S0S1

SBCK

SDAT

EFMI

CNTVOL

DPFIN

DPFOUT

DPDO

SMEF

SMON

SMDP
SMSD

LOCK
XOUT

XIN

MDAT

MCK

MLT

TRCNT

/ISTAT

66

72
73
75
76
70

37
38
36

69
68

26

SUBCODE

SYNC

DETECTOR

EFM

PHASE

DETECTOR

5
3

4
2

9
8

DIGITAL

PLL

DIGITAL

CLV

SERVO

CPU

INTERFACE

MODE

SELECTOR

23BIT
SHIFT

REGISTER

FRAME SYNC

DETECTOR

PROTECTOR

INSERTER

X-TAL

TIMING

GENERATOR

TRACK

COUNTER

DIGITAL

OUTPUT

32

33

SUBCODE

OUTPUT

EFM

DEMODULATOR

ADDRESS

GENERATOR

16K

SRAM

ECC

INTERPOLATOR

DIGITAL

FILTER

& DE-EMPH

D/A

CONVERTER

SUBCODE-Q

REGISTER

30

SQDT
SQCK

29

8BIT DATA BUS

11

LRCHO

12

ADATAO

14

BCKO

77

BCKI

67

ADATAI

80

LRCHI

24

EMPH

17

VREFL1

22

VREFH1

1-28

63

62

61

XTALSEL

TESTO

CDROM

65

TEST1

7

DATX

19

20

RCHOUT

LCHOUT

KB9223 (IC922) : ASSP(CD RF)

FEI

59 54 22 30 29 31 38 37 36 35 51 52 58 26 28 27 3

73

RF–

RFO

PD1

PD2

PD

LD

VR

ARF

IRF

ASY

EFM

RFI

DCB

74

65

66

63

67

F

68

E

79

EI

69

70

71

78

76

75

32

33

77

2

4

RF Amp

RF Amp

Focus Error Amp

FE-BIAS Adjustment

Tracking Error Amp
E/F Balance & Gain

Control

APC Amp

Center Voltage Amp.

RF Level AGC

&

Equalizer

EFM

Comparator

Defect Dectection

Circuit

TE1

WDCH

TRCNT

LOCH

ISTAT

RESET

Micom Data

Interface Logic

MICOM TO SERVO CONTROL

AUTO SEQUENCER

ADJUSTMENT-FREE CONTROL

FS1 to

FS4

TM to

TM6

BAL1 to

BAL5

Built-in Post Filter Amp (L&R)

15 16 13 14 19 17 12 11 9 105

MLT

PS1 to

PS4

MDATA

MCK

ATSC

GA1 to

GAS

TZC

FE2

FLB

FGD

FS3

Focus Phase

Compensation

& Offset cancel circuit

Tracking Phase

Compensation Block

& Jump Pulse GEN.

Sled Servo Amplifier

& Sled Kick GEN.

Spindle Servo LPF

(Double Speed)

MIRROR DETECTION

CIRCUIT

FOK DETECTION

CIRCUIT

MX-J100

60

FDFCT

47

FE-

48

FEO

57

TDFCT

49

TE-

50

TEO

53

TE2

55

LPFT

62

TG2

61

TGU

43

SLO

SL–

44

SL+

42

46

SPDLO

45

SPDL-

23

SMDP

24

SMON

25

SMEF

FSET

6

MIRROR

39

MCP

1

FOK

40

DCC1

GC10

GC11

CH10

CH11

MUTEI

RRC

CH20

CH21

GC21

GC20

1-29

MX-J100

KA9258D (IC925) : 4-ch Motor driver

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

10K

VCC VCC

GND

10K

10K

10K

T • S D

10K

+-

LEVEL SHIFT

REGULATOR

10K

50K

MUTE

LEVEL SHIFT

-+

10K

10K

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

GND

KA22291(DIC1) : Cassette amp.

PB

PR IN(2)

NF(2)

23 22 21 8 20 19 18 15

100K

A-IN

B-IN

PBOUT(2)

Vcc

Vcc

REC GND

PB OUT(1)

24

16

17

9

1

RECORD

LREF

PLAYBACK

LREF

100K

N.F

PRE

INPUT

REC.BIAS

PB.BIAS

INPUT

PRE

NF

MODE CONTROL

/BIAS CIRCUIT

A-IN

B-IN

2 3 4 5 7 6 10

PU

NF(1)

PB IN(1) A/BSWPB GND MUTE

R/PSWMUTE

SW

R/P SW

A/B SELECT S/W

MUTE

ALC RECOUT(2)

(IN2)

ALC TIME CONSTANT

IN(1)

OUT(1)

REC

ALC

DET

100K

PRE

PRE

100K

N.F

INPUT

INPUT

N.F

14

REC NF(2)

REC IN(2)

13

12

REC IN(1)

REC IN(1)

11

1-30

MX-J100

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.20817

Printed in Japan
200006(V)