SERVICE MANUAL
COMPACT COMPONENT SYSTEM
No.20995
Jul. 2001
COPYRIGHT
2001 VICTOR COMPANY OF JAPAN, LTD.
MX-G68V
MX-G65V
MX-G68V/MX-G65V
Area Suffix
US
Singapore
Safety precautions
Preventing static electricity
Important for laser products
Disassembly method
Wiring connection
Adjustment method
1-2
1-3
1-4
1-5
1-18
1-19
Flow of functional operation
until TOC read
Maintenance of laser pickup
Replacement of laser pickup
Troubleshooting
Description of major ICs
1-23
1-24
1-24
1-25
1-33~52
Contents
CA-MXG68V
CA-MXG65V
CANCEL
/DEMO
PRESET
PLAY & EXCHANGE
STANDBY/ON
STANDBY
DISC CHANGE
SOUND
MODE
SUBWOOFER
LEVEL
CD-R
/RW PLAYBACK
COMPACT COMPONENT SYSTEM
MX-G65V
CLOCK
/ TIMER
DISPLAY
PHONES
REPEAT
PROGRAM
REC START
/STOP
CD
REC START
DUBBING
TAPE A
TUNING
SET
TAPE B
RANDOM
EJECT
PLAY
FULL - LOGIC CONTROL
A
EJECT
REC/PLAY
CD SYNCHRO RECORDING
B
PREV
NEXT
RETURN
PBC
VCD NUMBER
COMPACT
DIGITAL VIDEO
VIDEO CD
SELECT
DISC SKIP
VOLUME
VOLUME
+
RMSMXG65VU REMOTE CONTROL
STANDBY/ON
12
3
4
5
6
78
9
10
+10
KEY CONTROL
SUBWOOFER
LEVEL
SOUND
MODE
FM MODE/
TAPE A/B
FADE
MUTING
FM/AM
CD
TAPE
KARAOKE
ECHO
PREV .
NEXT
RETURN
SLEEP
ON SCREEN
V.INTRO
HIGHLIGHT
SLOW
AUX
STILL
SELECT
CA-MXG65V
SP-MXG65V
SP-MXG65V
VIDEO CD
PlayBack
Control
Model
Color
UX
Saudi Arabia
Silver
Shanpagne-gold
MX-G68V/MX-G65V
1-2
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.).
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
!
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.
In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the
parts that are printed over with black such as the resistor (
), diode (
) and ICP (
) or identified by the " "
mark nearby are critical for safety.
When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer.
(Except the J&C version)
MX-G68V/MX-G65V
1-3
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 CD mechanism assembly is decomposed
1. Remove the CD changer unit.
2. Remove the CD holder 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.
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the CD mechanism assembly.
Soldering
Fig.1
Fig.2
Card wire
Card wire
Pickup unit
connector
Pickup unit
connector
CD changer unit
CD holder
mechanism
MX-G68V/MX-G65V
1-4
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.
6.CAUTION : Use of controls, adjustments or performance of
procedures other than those specified herein may result in
hazardous radiation exposure.
Position of labels
WARNING LABEL
! 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-G68V/MX-G65V
1-5
Remove the three screws A
attaching the metal
cover on the back of the body.
Remove the six screws B attaching 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 and 2)
Do not break the front panel tab fitted
to the metal cover.
ATTENTION:
Prior to performing the following procedure, remove
the metal cover.
Disconnect the card wire which is attached with
adhesive to the left side of the CD changer unit.
Disconnect the harness from connector CW1 and
CW7 on the back of the video CD board.
Disconnect the harness from connector RCW6 on
the main board.
Disconnect the card wire from connector UCW3 on
the FL dispaly & system control board.
Remove the two screws C attaching the CD changer
unit on the rear panel.
Remove the two screws D attaching the CD changer
unit on the side body.
Draw the CD changer unit upward from behind while
pulling the rear panel outward.
1.
2.
3.
4.
5.
6.
7.
Removing the CD changer unit
(See Fig.3 to 6)
Fig.1
Fig.2
Fig.3
Metal cover
A
A
A
Metal cover
B
B
Rear panel
Front panel
assembly
(Bottom side)
(Bottom side)
Video CD
board
CD changer unit
CW1
CW7