JVC MX-J770V User manual

SERVICE MANUAL
COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.
MX-J770V
MX-J880V
No.20861
Jul. 2000
COMPACT COMPONENT SYSTEM
MX-J770V
MX-J880V
Safety precautions
Important for laser products
Preventing static electricity
Precautions at disassembly
and parts replacement
Disassembly method
Adjustment method
1-2
1-3
1-4
1-5
1-6
1-31
Diagnosis which uses
extension wire method
Flow of functional operation
until TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-35
1-36
1-37
1-37
1-38
Contents
Area Suffix
US
UX Singapore Saudi Arabia
Each difference point
Model CD/DECK/RECEIVER SPEAKER
MX-J880V CA-MXJ880V
MX-J770V CA-MXJ770V SP-MXJ770V
SP-MXJ880V
Color
Tray fitting
Silver Light blue
Gray
Silver & blue Silver
Champagne-gold Champagne-gold
Panel Net Front
TAPE A/B
FADE
MUTING
RM–SMXJ770V REMOTE CONTROL
SLEEPECHO
SOUND
MODE VOCAL MASKING
REC
START/STOP
SUBTITLEHIGHLIGHT
FMMODE
STILL V.INTRO
ONSCREEN
PREV
SELECT
NEXT
KEYCONTROL
COMPACT
SUPER VIDEO
COMPACT
DIGITAL VIDEO
COMPACT
DIGITAL AUDIO
This illustration is MX-J770V

MX-J770V/MX-J880V
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 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.).
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-J770V/MX-J880V
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 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.
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)
!
CAUTION
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
CLASS 1
LASER PRODUCT

MX-J770V/MX-J880V
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-J770V/MX-J880V
1-5
Precautions at disassembling and parts replacement
This model is charged with electricity on the power board
even if the power cord is unplugged.
Therefore, always discharge electricity in accordance with
the steps given below before starting disassembling of the
unit and/or replacement of parts.
1.
2.
While referring to the disassembling steps, remove the
metal cover and the CD changer mechanism.
Set electrical resistances of 1kohm, 1/4W to the places between
the + and - terminals of condensers VH(C204, C205) and VL(C214, C215)
on the power board, and discharge electricity for 4 ~ 5 seconds.
Connection should be made at first for VH.
Power board
C205
C214 C204
C215

MX-J770V/MX-J880V
1-6
Remove the six screws Aattaching the metal cover
on the back of the body.
Remove the two screws Battaching the metal cover
on both sides of the body.
Remove the metal cover from the body by lifting the
rear part of the cover.
1.
2.
3.
Disassembly method
<Main body>
Removing the metal cover
(See Fig.1 to 3)
Do not break the front panel tab fitted
to the metal cover.
ATTENTION: Fig.1
Fig.2
Fig.3
Metal cover
A
AA
Metal cover
B
Metal cover
B

MX-J770V/MX-J880V
1-7
Prior to performing the following procedure, remove
the metal cover.
For the card wire connecting the CD changer
mechanism board and the main board, disconnect it
from connector CN868 on the main board.
Remove the two screws Cattaching the CD changer
mechanism assembly on both sides of the body.
Remove the two screws Dattaching the CD changer
mechanism assembly to the rear panel. Remove
the screw Eattaching the AUX terminal, two screws
Fattaching main speakers terminal and two screws
Hattaching the sub woofers terminal on the back of
the body.
Remove the screw G attaching the CD optical digital
output terminal and screw Iattaching video out
terminal.
Disconnect the harness from connector CN102 on
the video CD board, and pull out the earth wire
TW100 on the video CD board.
Pull the top of rear panel and the front panel
assembly outward respectively, then remove the CD
changer mechanism assembly and video out
terminal by lifting the rear part of the CD changer
mechanism assembly.
1.
2.
3.
4.
5.
6.
Removing the CD changer mechanism
assembly (See Fig.4 to 6)
Prior to performing the following procedure, remove
the CD changer mechanism assembly.
Reverse the CD changer mechanism assembly.
Remove the two screws J attaching the bracket.
Remove the screw Kattaching the video CD board.
Disconnect the card wire from connector CN100 and
CN101 on the video CD board.
At first, remove the claw a. Then remove the claw b
while raising the video CD board in the direction of
the arrow mark as figure. After removing the claw b,
you can removing the video CD board by pulling it
backward.
1.
2.
3.
4.
5.
Removing the video CD board
(See Fig.7)
CD changer
mechanism board
CD changer
mechanism assembly
Main board
CN868
C
Input / output board
CN871
CN870
Rear panel
Front panel assembly
Fig.4
Fig.5
Fig.6
Front panel assembly
CD changer
mechanism assembly
Rear panel
C
Rear panel
MAIN SPEAKERS
terminal
SUB WOOFERS
terminal
D
E
G
F
H
I
Video CD board
Bracket
CLAW a
Fig.7
J
K
CD changer
mechanism assembly
Video out board
Video CD board
CLAW b
CN100
TW100
CN102
CN101

MX-J770V/MX-J880V
1-8
Prior to performing the following procedure, remove
the metal cover and the CD changer mechanism
assembly.
Remove the four screws Lattaching the front panel
assembly on the bottom of the body.
Disconnect the card wire from connector CN865 on
the main board and pull out the earth wire on the
main board.
Disconnect the card wire from connector CN315 on
the input / output board.
Disconnect the harness from connector CN901 on
the relay board on the back of the front panel
assembly.
Disconnect the harness from connector CN912 on
the input / output board.
Disconnect connector CN870 and CN871 on the
input/output board from the main board.
Release the two joints cand don the lower part of
the sides using a screwdriver, and remove the front
panel assembly toward the front.
1.
2.
3.
4.
5.
6.
7.
Removing the front panel assembly
(See Fig.8 to 10)
Front panel assembly
Input / output board
Main board
CN865
Joint d
CN315
CN912
CN871 CN870
Fig.10
Fig.9
Fig.8
Relay board
CN901
Joint c
Main board
CN865 Front panel assembly
Front panel assembly
L
Earth wire

MX-J770V/MX-J880V
1-9
<Front panel assembly>
Prior to performing the following procedure, remove
the microphone terminal board assembly.
Disconnect the harness from connector CN900 and
the card wire from connector CN906 on the relay
board on the back of the rolling panel assembly
respectively.
Disconnect the harness from connector CN862,
CN863, CN850, CN851 and CN815 on the main
board respectively. Disconnect the card wire from
connector CN880 on the main board.
Disconnect the card wire from connector CN869 and
the harness from CN883 and CN884 on the main
board respectively.
Remove the four screws Oattaching the rolling panel
assembly.
1.
2.
3.
4.
Removing the rolling panel assembly
(See Fig.13 and 14)
For the harness which should be
connected to connector CN869,
CN883 and CN884 on the main board,
get them through the slots under the
rolling panel when reattaching the
rolling panel assembly to the front
panel (Refer to Fig.14)
ATTENTION:
Prior to performing the following procedure, remove
the metal cover, CD changer mechanism assembly
and the front panel assembly.
Pull out the MIC volume knob from the front side.
Remove the two screws M attaching the microphone
terminal board assembly.
Remove the screw Nattaching earth wire. Then
release the earth wire from the clamp on the upper
part of the cassette mechanism assembly.
Remove the microphone terminal board assembly
toward you.
1.
2.
3.
4.
Removing the Microphone terminal board
assembly (See Fig.11 and 12)
Fig.13
Fig.11
Fig.12
Fig.14
Main board
MIC volume knob
O
O
M
N
M
O
O
Relay board
CN900
Relay board
CN906 Rolling panel assembly
Main board
CN880 Relay board
CN900
Rolling panel
assembly
Main board
CN862,CN863
Main board
CN850,CN851
CN815
CN869
CN883,CN884
Microphone
terminal board
assembly
Cassette
mechanism
assembly

MX-J770V/MX-J880V
1-10
Prior to performing the following procedure, remove
the front panel assembly, the microphone terminal
board and the rolling panel assembly.
Disconnect the harness from connector CN867 on
the main board.
Disconnect the card wire from connector CN879 on
the main board (Before pulling out the card wire,
stand the part eof CN879 as shown in Fig.16).
Remove the two screws Pattaching the main board.
1.
2.
3.
Removing the main board
(See Fig.15 and 16)
Prior to performing the following procedure, remove
the front panel assembly.
Disconnect the card wire from connector CN306 on
the cassette mechanism board.
Remove the four screws Qand three screws R
attaching the cassette mechanism assembly.
1.
2.
Removing the cassette mechanism
assembly (See Fig.17)
Fig.15
Fig.16
Fig.17
Main board
P
Rolling panel
assembly
PCN867
CN879
CN879
e
Cassette mechanism board
Q
RR
Q
R
CN306

MX-J770V/MX-J880V
1-11
Prior to performing the following procedure, remove
the front panel assembly and the rolling panel
assembly.
Function board1 (See Fig.18)
Remove the two screws Sattaching the function
board 1.
Function board2 (See Fig.18)
Remove the two screws Tattaching the function
board 2.
Bass-level regulator board (See Fig.19)
Pull out the sub woofer volume knob on the front
side of the front panel assembly and remove the nut
attaching the bass-level regulator board.
Release the two joints f. Unsolder FW951 on the
bass-level regulator board and disconnect the
harness connected to the power switch.
Main volume & headphone board (See Fig.19)
Pull out the volume knob on the front side of the front
panel assembly and remove the nut attaching the
main volume & headphone board.
Remove the two screws Uattaching the main
volume & headphone board on the back of the front
panel assembly and release the two joints g.
Unsolder FW850 on the main volume & headphone
board and disconnect the harness connected to the
eject switch board.
Remove the screw Vattaching the earth wire
extending from the main volume & headphone
board.
1.
1.
1.
2.
1.
2.
3.
4.
Removing the boards in the front panel
assembly (See Fig.18 to 20)
Fig.18
Fig.19
SFunction
board 1
S
Function
board 2 T
T
FW850
Eject switch board
Joints g
U
Main volume & headphone board
V
Power switch board
Joints f
Bass-level
regulator board
Cassette mechanism assembly
FW951

MX-J770V/MX-J880V
1-12
Power switch board (See Fig.20)
Remove the two screws Wattaching the power
switch board. Unsolder FW951 on the power switch
board and disconnect the harness extending to the
bass-level regulator board.
Eject switch board (See Fig.20)
Remove the four screws Xattaching the eject switch
board. Unsolder FW850 on the eject switch board
and disconnect the harness extending to the main
volume & headphone board.
Remote control port board (See Fig.20)
Remove the screw Yattaching the remote control
port board.
1.
1.
1.
Prior to performing the following procedure, remove
the metal cover and CD changer mechanism
assembly.
There is no need to remove the front panel
assembly.
Disconnect the harness from connector CN900 and
CN901 on the relay board on the back of the rolling
panel assembly.
Disconnect the card wire from connector CN905 and
CN906 on the relay board on the back of the rolling
panel assembly.
Remove the screw Zattaching the relay board.
Remove the relay board from the groove i.
Remove the screw Aattaching the fixing board and
remove the fixing board from the groove j.
1.
2.
3.
4.
Removing the relay board and fixing
board (See Fig.21)
Y
Remote control port board
Power switch board
Eject switch
board
X
X
W
FW951
FW850
Fig.20
Fig.21
Rolling panel assembly
CN905
Z
A
Groove i
CN900
CN901
Relay board
Groove j
Fixing board
Bass-level
regulator board
Main volume &
headphone board
CN906

MX-J770V/MX-J880V
1-13
Prior to performing the following procedure, remove
the metal cover and CD changer mechanism
assembly.
Remove the two plastic rivets attaching the joint
board, and remove the joint board.
Disconnect the card wire from connector CN1 on the
tuner board.
Remove the two screws Battaching the tuner board
on the back of the body.
1.
2.
3.
Removing the tuner board
(See Fig.22 and 23)
<Rear panel assembly>
Prior to performing the following procedure, remove
the tuner board.
Disconnect the card wire from connector CN315 on
the input / output board.
Remove the screw Cattaching the input / output
board on the lower side of the body.
Remove the five screws, E, F& Hattaching the AUX,
main speakers, sub woofers terminal board on the
back of the body.
Remove the screw Gattaching the CD optical digital
output back of the body.
Disconnect the harness from connector CN912 on
the input / output board and pull out the earth wire on
the main board.
Disconnect connector CN870, CN871, CN612,
CN711 and CN712 on the input / output board by
pulling out them outward. Remove the input / output
board from the body.
1.
2.
3.
4.
5.
6.
Removing the input / output board
(See Fig.22 and 23)
Fig.22
Fig.23
Tuner board
Plastic rivet
Joint board
Input / output board
Rear panel
CN1 CN871
CN870
C
CN711
CN712
CN315
Rear panel
B
G
E
F
H

MX-J770V/MX-J880V
1-14
Prior to performing the following procedure, remove
the metal cover and the CD changer mechanism
assembly.
There is no need to remove the front panel
assembly.
Remove the two screws Dattaching the rear cover
on the back of the body.
Remove the five screws E& F, H attaching AUX,
main speakers and sub woofers terminal board to
the rear panel on the back of the body.
Remove the screw G attaching the CD optical digital
output terminal.
Remove the five screws Zattaching the heat sink
and the pre-amplifier board to the rear panel on the
back of the body.
Remove the two screws Yattaching the voltage
selector to the rear panel on the back of the body.
Remove the screw X attaching the rear panel to the
chassis base on the back of the body.
Remove the two screws Battaching the tuner board
on the back of the body.
Release the two joints kand l on the rear panel
bottom using a screwdriver, and detach the rear
panel backward.
1.
2.
3.
4.
5.
6.
7.
8.
Removing the rear cover / rear panel
(See Fig.24 to 27)
Fig.24
Fig.25
Fig.26
Fig.27
D
Rear panel
Rear cover
Z
Y
Z
X
E
G
Z
Z
Heat sink
Rear panel
Joint k
Joint l
Rear panel
F
H
B

MX-J770V/MX-J880V
1-15
Prior to performing the following procedure, remove
the metal cover, the CD changer mechanism
assembly, the tuner board, input / output board and
the rear cover / rear panel.
There is no need to remove the front panel
assembly.
Disconnect the harness from connector CN901 on
the relay board on the back of the rolling panel
assembly.
Disconnect the harness from connector CN713 on
the pre-amplifier board.
Remove the two screws Hattaching the heat sink to
the power & main amplifier board on the back of the
body.
Remove the fore screws I& Jattaching the pre-
amplifier board and IC to the heat sink.
Remove the bracket, then detach the pre-amplifier
board from the heat sink.
1.
2.
3.
4.
5.
Removing the pre-amplifier board / heat
sink (See Fig.28 to 30)
Fig.28
Fig.29
Fig.30
Pre-amplifier board
CN713
Relay board
CN901
Pre-amplifier board
Power & main
amplifier board
Heat sink
H
Heat sink
Pre-amplifier board
Bracket
IJ
IC

MX-J770V/MX-J880V
1-16
Prior to performing the following procedure, remove
the metal cover, the CD changer mechanism
assembly, the rear cover / rear panel, the tuner
board, the input / output board and the pre-amplifier
board.
Remove the four screws Kattaching the transf. on
the power & main amplifier board through the upper
side slots.
Remove the two plastic rivets fixing the power &
main amplifier board.
Remove the cord stopper by pushing it upward.
Cut off the bands mand n fixing the power cord and
unsolder the power cord on the power & main
amplifier board.
1.
2.
3.
4.
Removing the power & main amplifier
board (See Fig.31 and 32)
Fig.31
Fig.32
K
Power & main
amplifier board
K
K
Plastic rivet Plastic rivet
Power & main amplifier board
Cord stopper
Soldered part
Band m Band n

MX-J770V/MX-J880V
1-17
Prior to performing the following procedure, remove
the rolling panel assembly and the main board.
Remove the two screws Lattaching the multi-control
assembly on both sides.
Remove the multi-control assembly outward while
pushing the right and left hooks fixing multi-control
assembly outward respectively.
1.
2.
Removing the multi-control assembly
(See Fig.33 to 35)
<Rolling panel assembly>
Prior to performing the following procedure, remove
the rolling panel assembly, the main board and the
multi-control assembly.
Remove the four screws Mattaching the cover and
the bracket.
Pull out the right and left panel holders outward
respectively by releasing the tabs ooutward.
Remove the cover and the bracket.
Remove the two screws Nattaching the multi-control
board.
1.
2.
3.
4.
Removing the multi-control board
(See Fig.36 to 38)
L
Multi-control assembly
Multi-control assembly
L
Fig.36
Fig.37
Fig.38
Fig.35
Fig.33
Fig.34
Multi-control assembly
Hook
Bracket Bracket
MM
Cover
Bracket
Tab o
Panel holder
N
Multi-control board

MX-J770V/MX-J880V
1-18
Prior to performing the following procedure, remove
the rolling panel assembly and the main board.
Remove the relay board and fixing board (Refer to
Fig.21).
Remove the two screws Oattaching the motor
bracket and remove the motor lead staple p.
Remove the two screws P attaching the shaft
bracket.
Remove the motor belt.
Remove the three screws Qattaching the side
bracket.
Remove the shaft assembly from the rolling panel
assembly by lift up the shaft assembly upward.
Remove the drive motor upward.
1.
2.
3.
4.
5.
6.
7.
Removing the drive motor assembly
(See Fig.39 to 42)
Fig.21
Fig.39
Fig.40
Fig.41
Rolling panel assembly
Z
A
Groove i
CN900
CN901
Relay board
Groove j
Fixing board
Z
Relay board
A
Fixing board
P
O
Shaft bracket
Motor belt
Motor lead staple p
Shaft assembly Drive motor
CN905
CN906
Motor bracket
Q
Side bracket
Fig.42

MX-J770V/MX-J880V
1-19
Prior to performing the following procedure, remove
the metal cover and the CD changer mechanism
assembly.
Disconnect the card wire from connector CN101 and
CN102 on the super VCD control board.
Remove the two plastic rivets attaching the super
VCD control board.
1.
2.
Removing the super VCD control board
(See Fig.43)
Fig.43
CD changer
mechanism assembly
Super VCD control board
Plastic rivet Plastic rivet
CN101 CN102

MX-J770V/MX-J880V
1-20
Screw
A
Screw A
Screw B
Screw B
Speaker cover
Sub woofer
unit
Plug wire
(Red) Plug wire
(Black)
Fig.1
Sub woofer
unit
Fig.4
Holder
Fig.5
Saran board
Ornament panel assembly
Ornament
panel
assembly
Ornament
panel
assembly Holder &
screw CHolder &
screw C
Fig.6
top
Fig.7
concave part
Bottom
Bottom
Plug wire
(Yellow)
Plug wire
(Black)
Middle range
unit
Fig.8
Remove the five screws Aattaching the speaker
cover on the side of the body.
1.
Remove the four screws B attaching the sub
woofer unit.
Two plug wires connected with the sub woofer
unit are pulled out.
1.
2.
Removing the sub woofer unit (See Fig.2 and 3)
Removing the speaker cover (See Fig.1)
Fig.2
Fig.3
Remove the saran board from the speaker box.
(Saran board can be detached by pulling the side
of Saran board forward.)
The plus driver is inserted in the holder, it is lifted,
and the holder is removed.
Four holders are removed, and four screws Cunder
that are removed.
The minus driver is inserted in the concave part in the
speaker box bottom and inserts in the interior little
by little.
Two plug wires connected with the
middle range unit are pulled out.
Removing the ornament panel assembly
(See Fig.4 to 8)
1.
2.
3.
4.
5.
CAUTION : Please apply the felt or the cloth, etc.
to damage neither the ornament panel nor the
cabinet when the ornament panel assembly is
detached when working.
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