JVC MX-J300 User manual

SERVICE MANUAL
COMPACT COMPONENT SYSTEM
No.20852
Jul. 2000
COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.
MX-J300
MX-J300
Contents
Safety Precautions
Important for laser products
Preventing static electricity
Disassembly method
Adjustment method
Flow of functional
operation until TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-2
1-3
1-4
1-5
1-24
1-27
1-28
1-28
1-29
Area Suffix
B
E
EN
EE
EV
U.K.
Continental Europe
Northern Europe
Russia
Eastern Europe
COMPACT
DIGITAL AUDIO
CD 3
CD 2
CD 1
STANDBY
VOLUME
CD 1
CD
2
CD 3
PLAY& EXCHANGE
FM /AM
CD
PLAY
REC/PLAY
AUTO REVERSE
EJECT
COMPACT
DIGITAL AUDIO
TAPE
COMPU
PLAY
CONTROL
FULL - LOGIC CONTROL
1 BIT
DUAL D/A CONVERTER
AUX
PHONES
PANELOPEN / CLOSE
POWERED ROLLING PANEL
MX-J300
+
–
EJECT
1
/CLEAR
C D
TAPE
CLOCK TIMER
SLEEP
SELECT
–+
RM-SMXJ300V REMOTE CONTROL
2 3
4 5 6
AUX
FM/AM
FM MODE
PLAY MODE CD3CD2CD1
A – TAPE - B REC PAUSE
SOUND
MODE VOLUME ACTIVE
BASS EX.
SHIFT
7 8 9
10 + 10
SET

MX-J300
1-2
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 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, 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.).
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.
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE
!
CAUTION
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-J300
1-3
Important for laser products
1.CLASS 1 LASER PRODUCT
2.DANGER : Invisible laser radiation when open and inter
lock failed or defeated. Avoid direct exposure to beam.
3.CAUTION : There are no serviceable parts inside the
Laser Unit. Do not disassemble the Laser Unit. Replace
the complete Laser Unit if it malfunctions.
4.CAUTION : The compact disc player uses invisible
laserradiation and is equipped with safety switches
whichprevent emission of radiation when the drawer is
open and the safety interlocks have failed or are de
feated. It is dangerous to defeat the safety switches.
5.CAUTION : If safety switches malfunction, the laser is able
to function.
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)
VARNING : Osynlig laserstrålning är
denna del är öppnad och spårren är
urkopplad. Betrakta ej strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettaessa olet alttiina
näkymättömälle lasersäteilylle.Älä
katso säteeseen. (d)
ADVARSEL :Usynlig laserstråling
ved åbning , når
sikkerhedsafbrydere er ude af
funktion. Undgå udsættelse for
stråling. (f)
CLASS 1
LASER PRODUCT
!
CAUTION
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.

MX-J300
1-4
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.
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
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap
Attention when traverse unit is decomposed
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.
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the CD traverse mechanism.
Soldering
Fig.1
Fig.2
CD changer
mechanism
assembly
CD traverse
unit
Flexible cable

MX-J300
1-5
Remove the six screws Aattaching the metal cover
on the back of the body.
Remove the two screws Bon 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

MX-J300
1-6
Prior to performing the following procedures, remove
the metal cover.
The flat cable which has gone out of the headphone
board is removed from the wire clamping under CD
changer mechanism assembly.
Remove the two screws Cattaching the CD changer
mechanism assembly on the top of the body.
Disconnect the card wire from connector CN303 on
top of the main board.
Remove the plastic rivet afixing the main board to
the front panel assembly on the left side of the body.
Remove the two screws Dfrom the rear panel.
Detach upward the rear part of the CD changer
mechanism assembly while pulling the front panel
1.
2.
3.
4.
5.
Removing the CD changer mechanism
assembly (See Fig.4 to 7)
Fig.6
Fig.5
Fig.4
Fig.7
Pull outward
C
Main board
CN303
Plastic rivet a
CN303
CD changer mechanism assembly
Rear panel
Front panel
assembly
D
Rear panel
CD changer
mechanism
assembly
CD changer mechanism
assembly
Rear panel
Front panel
assembly
Pull outward
Main board
Main board
Wire clamp

MX-J300
1-7
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 bon the bottom of the body and
the joints cand don 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
EFront panel
assembly
Joint b
Front panel
assembly
Joint c
Front panel
assembly Joint d
(Bottom)

MX-J300
1-8
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.
Remove the two screws Fand the rear cover on the
back of the body.
Remove the four screws Gand the six screws H
attaching the main board and the heat sink to the
rear panel.
Remove the screw Iattaching the rear panel to the
base chassis.
Release the lower two joints eand fon both sides of
the rear panel using a screwdriver and detach the
rear panel backwards.
1.
2.
3.
4.
Removing the rear cover and the rear
panel (See Fig.13 to 16)
Fig.13
Fig.14
Fig.15
Fig.16
I
Rear panel
H
G
Rear panel
FF
Rear cover
G
G
H
Rear panel Joint e
Rear panel
Joint f
(To Earth bracket)

MX-J300
1-9
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 Kand the screw Lattaching
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
1-10
Prior to performing the following procedure, remove
the metal cover and the CD changer mechanism
assembly.
Disconnect the harness from connector CN901A and
CN901B on the inside of the main board.
Cut off the tie band gof the power transformer
assembly and unsolder the power cord.
(Make sure to bundle the wires after repair.)
Remove the four screws Mattaching 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.
1.
2.
3.
Removing the power transformer
assembly (See Fig.21 to 23)
Fig.21
Fig.22
Fig.23
M
Power transformer assembly
Tie band g
CN901A,CN901B
MPower transformer
assembly
Tie band g
Tie band g
Power transformer
assembly
Power cord stopper
Rear panel

MX-J300
1-11
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 Nattaching 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 hon
the DC motor (The Flg.27 shows the
details).
ATTENTION:
Unsolder the soldering ion the flexible wire for the
cassette amplifier board head at the bottom of the
cassette mechanism assembly.
Remove the four screws Oattaching the cassette
amplifier board on the bottom of the cassette
mechanism assembly.
2.
3.
Fig.24
Fig.25
Fig.26
NN
N
OO
N
Cassette
mechanism
assembly
Cassette amplifier board
CN352
Cassette amplifier board
Cassette amplifier board
CN352 CN353
Cassette mechanism
board
DC motor
h
Soldering iR/P head
(Bottom)

MX-J300
1-12
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 CN704 and
the harness from CN706, CN707 and CN708 on the
display board over the rolling panel.
Remove the four screws Pattaching the bracket.
Remove the four screws Qattaching the rolling panel
assembly.
Pull out the rolling panel assembly.
1.
2.
3.
4.
Prior to performing the following procedure, remove
the rolling panel assembly.
Disconnect the card wire from connector CN705 and
the harness from CN703 on the display board.
Remove the two screws Rattaching the display
board.
Pull out the display board upward.
1.
2.
3.
Removing the rolling panel assembly
(See Fig.27 to 29)
Removing the display board (See Fig.30)
Fig.27
Fig.28
Fig.29
Fig.30
P
Q
Q
Q
Q
Display board
Rolling panel assembly
Bracket
CN707
CN706
Display board
Display board
CN708
CN703
CN703
H.phone jack
board
CN704
R
RDisplay board CN705

MX-J300
1-13
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 jon the back of the front
panel assembly and detach the volume board.
1.
2.
Remove the three screws Tattaching 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 Sattaching 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 Wattaching the headphone
board.
1.
Remove the three screws Vattaching 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 Uattaching 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
1-14
Remove the two screws Xon both sides of the multi
control assembly.
Disconnect the card wire from connector CN705 on
the display board.
Pull outwards the joints lon both sides and detach
the multi control assembly toward the front.
1.
2.
3.
<Rolling panel assembly>
Removing the multi control assembly
(See Fig.34 to 36)
Prior to performing the following procedure, remove
the multi control assembly.
Remove the six screws Yattaching the cover and
the bracket.
Release the hooks mon 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.
Remove the two screws Zattaching the multi control
board.
1.
2.
3.
Removing the multi control board
(See Fig.37 to 39)
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.
Fig.36
Fig.35
Fig.34
Fig.37
Multi control assembly
X
Multi control assembly
X
Multi control assembly Joint l
Y
Cover
CN705
Bracket
Y
Y
Bracket
Fig.39
Fig.38
Bracket
Hook m
Z
Panel holder
Multi control board
CN705

MX-J300
1-15
Prior to performing the following procedures, remove
the display board.
Remove the two screws Aattaching the motor
bracket, then detach the motor leads from the fixing
plate n.
Remove the two screws Battaching the shaft
bracket.
Remove the motor belt.
Pull the parts oon 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)
Caution :
When remove the flat wire from the connector
CN705, Please pay attention not to crease when
creased, the flat wire may be broken in the operation
hundred of times.
Fig.40
Fig.41
BA
Motor bracket
Shaft bracket Fixing plate n
Shaft assembly Motor belt
Drive motor assembly
Part oPart o

MX-J300
1-16
Removing the CD Servo control board
(See Fig.1)
Removing the CD tray assembly
(See Fig.2~4)
1.
2.
3.
4.
5.
6.
7.
8.
9.
Remove the front panel assembly.
Remove the CD changer mechanism assembly.
Remove the CD Servo control board.
Remove the screw C' retaining the lod stopper.
From the T.bracket section "b" and clamper base
section "c" , remove both of the edges fixing the
rod(See Fig.2 and 3).
Remove the screw Dretaining the disc stopper
(See Fig.3).
Remove the three screws Eretaining the T.bracket
(See Fig.3).
Remove the screw Fretaining the clamper assembly
(See Fig.3).
From the left side face of the chassis assembly, remove
the one screw Gretaining both of the return spring and
lock lever(See Fig. 4).
By removing the pawl at the section "d" fixing the return
spring, dismount the return spring(See Fig.4).
Remove the three lock levers(See Fig.4).
10.
11.
Fig.1
Fig.2
Fig.3 Fig.4
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 Aretaining 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 Bis 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.
CN601
CN801
b
c
G
Rod
T.Braket
Clamper base
T.Braket Disc stopper
Lod stopper
(C/J version only)
Clamper ass'y
b
a
EE
C
F
E
d
Lock lever
Return spring
CD servo control board
CN651
CN854
aa
BB
A
A
C.B.Holder
CN151
CN652
D
Earth
wire

MX-J300
1-17
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
gg'

MX-J300
1-18
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 Hretaining the CD loading
mechanism assembly.
Removing the CD traverse mechanism
(See Fig.11 and 12 )
1.
2.
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" .
By raising the CD loading mechanism assembly in the
arrow direction "l", remove the assembly from the lifter
unit
Fig.10
Fig.12
Fig.11
Fig.13
Removing the CD pick unit
(See Fig.13 )
1.
2.
3.
4.
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
the center position.
While pressing the stopper retaining the shaft in the
arrow direction "o" , pull out the shaft in the arrow
direction "p".
After dismounting the shaft from the CD pickup unit,
remove the CD pickup unit
Cams R1, R2 assembly
i
CD loading mechanism assembly
h
H
H
HH
Arrow
Lifter unit
CD traverse mechanism
k
n
op
m
Arrow
Cam R1, R2 assembly
k
Arrow
j
CD Pickup unit
CD loading
mechanism
Shaft
Cam gear
Shaft
Shaft
Stopper Stopper

MX-J300
1-19
Removing the cam unit
(See Fig.14 ~17 )
1.
2.
3.
4.
5.
Remove the CD loading mechanism assembly.
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).
While turning the cam gear "q", align the pawl "s"
position of the select lever to the notch position(Fig.18)
on the cam gear "q".
Remove the four screws Jretaining the cam unit(cam
gear "q" and cams R1/R2 assembly)(See Fig.18).
Fig.15
Fig.14
Fig.16
Cam gear q
Drive unit
r
I
J
J
J
Chassis assembly
Tray select
switch board
CN802
CN801
CN804
Cylinder gear
Drive unit
Fig.17
Select lever
Cams R1, R2 assembly
Cam unit
Cam gear q
s

MX-J300
1-20
Fig.18
Fig.20
Fig.19
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.
Removing the actuator motor and belt
(See Fig.18~21)
1.
2.
3.
4.
5.
Remove the two screws Kretaining the gear bracket
(See Fig.19).
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
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
actuator motor pulleys and pulley gears(See Fig. 19).
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. 21).
Pulley gear
Belt
Motor pulley
Belt
Pulley gear
Motor pulley
Gear bracket
t
K
K
Pawl
v
Actuator motor
v
Chassis assembly
u
Gear bracket
Pulley gear
Gear B
Cylinder gear
Gross gear U
Gear C
Gross gear L
Select gear
Gear B
Gear C
Pulley gear
Assembly and Configuration Diagram