JVC MX-G68V User manual

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 TAPEA
TUNING
SET
TAPEB
RANDOM
EJECT
PLAY
FULL - LOGIC CONTROL
A
EJECT
REC/PLAY
CD SYNCHRO RECORDING
B
PREV
NEXT
RETURNPBC VCD NUMBER
COMPACT
DIGITALVIDEO
VIDEO CD
SELECT
DISCSKIP
VOLUME
VOLUME
+
–
RM–SMXG65VUREMOTE CONTROL
STANDBY/ON
123
456
789
10
+10
KEYCONTROL
SUBWOOFER
LEVEL SOUND
MODE
FMMODE/
TAPEA/B FADE MUTING
FM/AM
CD
TAPE
KARAOKE ECHO
PREV. NEXT
RETURN
SLEEP
ONSCREEN 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 Aattaching the metal
cover on the back of the body.
Remove the six 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 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 Dattaching 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
AA
Metal cover B
B
Rear panel
Front panel
assembly
(Bottom side)(Bottom side)
Video CD
board
CD changer unit CW1
CW7

MX-G68V/MX-G65V
1-6
Prior to performing the following procedure, remove
the metal cover and the CD changer unit.
Disconnect the card wire from connector FCW3 and
the harness from connector JCW1, JCW2 ECW1
and HCW3 on the inner side of the main board in the
body.
Remove the two screws Eattaching the front panel
assembly on both sides of the body.
Remove the screw Fattaching the earth terminal
extending from the cassette mechanism assembly.
Remove the screw Gattaching the front panel
assembly and main board.
Remove the screw Hattaching the front panel
assembly on the bottom of the body.
Release the two joints aon both sides and two joints
bon the bottom of the body using a screwdriver.
1.
2.
3.
4.
5.
6.
Removing the front panel assembly
(See Fig.7 to 9 )
Rear panel
C
D
D
Rear panel Rear panel
Front panel assembly
Adhesive card wire strap
CD changer unit
CD changer unit
Fig.7
Main board
FCW3
JCW2
JCW1
HCW3
Front panel assembly
Joint a
Earth wire
E
F
ECW1
Fig.4 Fig.5
Fig.6a Fig.6b
UCW3
Front panel
assembly
FLdispaly & system
control board
RCW6

MX-G68V/MX-G65V
1-7
Prior to performing the following procedure, remove
the metal cover and the CD changer unit.
Remove the four screws Iattaching the heat sink
cover to the rear panel on the back of the body.
Remove the four screws Jattaching the heat sink &
amplifier board to the rear panel on the back of the
body.
Remove the two screws Kattaching the speaker
terminal to the rear panel on the back of the body.
Disconnect the card wire from connector ACW1 and
the harness from connector ACW2 on the amplifier
board.
After moving the heat sink upward, remove the
claws. Then pull out the heat sink & amplifier board .
1.
2.
3.
4.
5.
Removing the heat sink & amplifier
board (See Fig.10 to 12)
Fig.8
Fig.9
Front panel assembly
G
E
Main board
H
Joint b
Joint b
Joint c
Bottom side
Fig.10
Fig.11
Rear panel
Heat sink
cover
Heat sink
Speaker terminal
Tuner terminal
K
L
I
I
J
J
Fig.12
ACW1
Rear panel
Amplifier
board
ACW2

MX-G68V/MX-G65V
1-8
Prior to performing the following procedure, remove
the metal cover and CD changer unit.
Disconnect the card wire from connector CON01 on
the tuner board.
Remove the two screws L attaching the tuner board.
1.
2.
Removing the tuner board
(See Fig.11 and 13)
Prior to performing the following procedure, remove
the metal cover, CD changer unit, heat sink &
amplifier board and tuner board.
Remove the one screw M, three screws N and three
screws N' attaching the rear panel.
Removing the rear panel (See Fig.14)
1.
Prior to performing the following procedure, remove
the metal cover, CD changer unit, heat sink &
amplifier board, tuner board and rear cover.
Disconnect the card wire from connector FCW3 and
the harness from connector JCW1, JCW2, ECW1
and HCW3 on the main board.
Disconnect the harness from connector PCW1 on
the power transformer board.
Remove the screw Gattaching the main board
holder. (See Fig.8)
Remove the two screws O attaching the heat sink
and bottom chassis.
1.
2.
3.
4.
Removing the main Board
(See Fig. 15)
Main board
Tuner board
CON01
N
M
Fig.14
Rear
panel
Fig.13
N'
Fig.15
Transformer board
O
FCW3
JCW2 JCW1
HCW3
PCW1
Main board
ECW1
Rear
panel

MX-G68V/MX-G65V
1-9
Prior to performing the following procedure, remove
the metal cover, CD changer unit, heat sink &
amplifier board .
Remove the four screws Pattaching the power ICs
to the heat sink.
Unsolder the power ICs solder point.
1.
2.
Removing the power ICs
(See Fig.16 and 17)
Prior to performing the following procedure, remove
the metal cover, CD changer unit, heat sink &
amplifier board, tuner board and rear cover.
Disconnect the power cord from connector RCW2 of
the power transformer board.
Disconnect the harness from connector PCW1 of the
power transformer board.
Remove the four screws Qattaching the power
transformer.
1.
2.
3.
Removing the power transformer
(See Fig.18)
Fig.17
Fig.16
P
Heat sink
Amplifier board
Heat sink
Power ICs solder point
Fig.18
QPower cord
RCW2
PCW1
Power transformer
Q

MX-G68V/MX-G65V
1-10
Disconnect the card wire from the connectors
UCW3, UCW5,UCW6 and UJW5 on the FL display &
system control board.
Remove the five screws Sattaching the FL display &
system board.
Disconnect the card wire from the connector UCW2
on the FL display & system control board.
1.
2.
3.
Removing the FL display & system
control board (See Fig.19)
Disconnect the card wire from connector UCW1 of
the power switch board.
Remove the five screws Rattaching the power
switch board and release the tab coutward.
1.
2.
Prior to performing the following procedure, remove
the metal cover, the CD changer unit and the front
panel assembly.
Removing the power switch board
(See Fig.19)
Prior to performing the following procedure, remove
the FL display & system control board.
Pull out the volume knob, subwoofer level knob and
sound mode knob from front side.
Remove the eleven screws T attaching the front
board and release the two tabs doutward.
Release the two tabs eoutward and remove the MIC
board.
1.
2.
3.
Removing the front board / MIC board
(See Fig. 20 and 21)
<Front panel assembly>
Prior to performing the following procedure remove
the FL display & system control board.
You can pull out the headphone board. 1.
Removing the headphone board
(See Fig.20)
Disconnect the card wire ffrom the mechanism
board on the cassette mechanism assembly.
Remove the six screws Uattaching the cassette
mechanism assembly.
1.
2.
Removing the cassette mechanism
assembly (See Fig.20)
Fig.19
Fig.20
Fig.21
Headphone
board
Tab c
Cassette mechanism assembly
R
Power switch board
T
T
S
S
FLdiplay & system
control board
U
Front board
Card wire f
SOUND MODE
knob
VOLUME knob
SUBWOOFER
LEVEL knob
Tab d
T
UCW2
UCW3
UJW5
UCW5
UCW6
S
UCW1
T
Mic board
Tab e

MX-G68V/MX-G65V
1-11
Disconnect the card wire from connector SW1 of the
video CD board.
Turn the black loading pulley gear 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.
Disconnect the card wire from connector CW6 of the
Video CD board on the upper side of the CD changer
unit.
Push down the two tray stoppers marked aand pull
out the CD tray.
1.
2.
3.
4.
Align the gear-cam with the gear-tray as shown fig.4,
then mount the CD tray.
When assembling the CD tray, take extreme care not
engage with gear-synchro.
1.
2.
Prior to performing the following procedure, remove
the CD changer unit.
Removing the CD tray (See Fig.1 to 3)
Reinstall the CD tray (See Fig.4 and 5)
<CD changer unit>
Fig.2
Fig.1
Fig.3
Fig.4 Fig.5
Loading pulley
gear
CD tray
CD tray
CD tray
Gear-convert
Gear-convert
Gear-cam
Gear-tray
Gear-synchro
Gear-tray
Gear-tray
Gear-cam
timing point
CD tray
Video CD board
CW6
a
(Tray stopper)
a(Tray stopper)
Video CD
board
SW1

MX-G68V/MX-G65V
1-12
Prior to performing the following procedure, remove
the CD tray.
Remove the screw A attaching the sensor board and
release the two tabs battaching the sensor board on
the under side of the CD tray.
Disconnect the harness from connector CW1 on the
sensor board and release the harness from the two
hooks c. Remove the sensor board.
Remove the screw Battaching the turn table. Detach
the turn table from the tray.
Pull outward the tab marked dattaching the turn
table motor assembly on the upper side of the tray
and detach the turn table motor assembly from the
tray.
1.
2.
3.
4.
Removing the sensor board / the turn
table motor assembly (See Fig.6 to 8)
Prior to performing the following procedure, remove
the CD tray.
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.
Detach the belt from the pulley on the upper side of
the CD changer unit (Do not stain the belt with
grease).
Disconnect the card wire from the connector SW1 on
the Video CD board.
Remove the three screws Dattaching the video CD
board. First release the three tabs fand tabs e
attaching the video CD board motor to raise the
video CD board slightly, then release the video CD
board.
If the tabs eand fare hard to release, it is
recommendable to unsolder the two soldered points
on the motor terminal of the video CD board.
1.
2.
3.
Removing the belt, the Video CD board
(See Fig.9 and 10)
Fig.7
Fig.6
Fig.8
Tab b
cSensor board
CW1
Turn table
Tray B
Turn table motor assembly
d
A
Tab b
Fig.9
Belt
CD changer unit
Motor

MX-G68V/MX-G65V
1-13
Disconnect the card wire from pickup unit connector
on the motor board in the CD mechanism holder
assembly on the under side of the CD changer unit.
Remove the screw Eattaching 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 .
Pull out the CD mechanism holder assembly.
1.
2.
3.
4.
Removing the CD mechanism holder
assembly (mechanism included)
(See Fig.11 to 13)
Fig.10
Video CD board
D
SW1
E
CD mechanism
holder assembly
Stopper
Fig.11
Motor board
SW1
Fig.13
CD mechanism holder assembly
Fig.12
CD changer unit
Pickup unit
connector
Soldered points
Tabs f
Tab e
Tabs f
Motor board
connector

MX-G68V/MX-G65V
1-14
Fig.1
Fig.2
R/P head
A
B
R/P head
Fig.3
C
D
P.B. head
Cassette mechanism
A
B
C
D
P.B. head
R/P head assembly
P.B. head assembly
<Cassette mechanism section>
Prior to performing the following procedure,
removing the cassette mechanism.
Removing the R/P head. (Fig.1 to 3)
Remove the screw Aattaching the R/P head right side.
Remove the screw Battaching R/P head left side.
(Screw B: Head azimuth adjusting screw.)
Removing the P.B. head. (Fig.1 to 3)
Removing the screw C attaching the P.B. head right side.
Removing the screw Dattaching the P.B. head left side.
(Screw D: Head azimuth adjusting screw.)
1.
2.
1.
2.

MX-G68V/MX-G65V
1-15
R/P Head
Stopper
Pinch roller
Pinch roller cap
Slide spring
Fig.4
E
Cassette mechanism
Slide spring
Pinch roller unit
Prior to performing the following procedure,
removing the cassette mechanism.
Removing the pinch roller unit.
(Fig. 4)
Remove the two screws Eattaching the p inch roller unit .
Attention:
The pinch roller cap is forcefully fitted to the shaft
of the pinch roller unit. If the pinch roller cap is
taken out by force, the shaft will be broken.
When replacing the pinch roller, it should be
changed as a pinch roller unit itself.
1.

MX-G68V/MX-G65V
1-16
Fig.9
F
Capstan belt (Flat)
Capstan belt (Flat)
Motor
GG
Solder point
Capstan shaft
Fig.5
a
Capstan shaft
b
Cassette mechanism
Fig.7
Drive belt
Capstan belt (Flat)
Capstan belt (Flat)
Drive belt
Fig.6
Drive belt
Drive belt
Capstan belt (Flat)
Washer
a
b
Prior to performing the following procedure,
removing the cassette mechanism.
Removing the motor. (Fig.7 to 9)
Unsolder the solder point on the motor terminal.
Remove the capstan belt from the motor pulley.
Remove the two screws F attaching the
motor bracket.
Remove the two screws G attaching the motor.
1.
2.
3.
4.
Fig.8
Motor bracket
Cassette mechanism
F
Motor bracket
Prior to performing the following procedure,
removing the cassette mechanism.
Removing the flywheel. (Fig.5 to 7)
Remove the cut washers at aand bfrom the
capstan shaft. Then remove the flywheel.
When reassembling the flywheel, be sure
to use new cut washers as they cannot
be reused.
1.

MX-G68V/MX-G65V
1-17
Prior to performing the following procedure, remove
the side panel.
Remove the five screws Aand Battaching the side
panel, then remove the side panel.
1.
Removing the side panel (See Fig. 1)
Remove the fore screws Cattaching the side
speaker.
Pull out the side speaker and remove the speaker
cord from the speaker terminal.
1.
2.
Removing the side speaker
(See Fig. 2 and 3)
< Speaker section >
Side panel
Side speaker
Front panel
Side speaker
Speaker terminal
Fig.1
A
B
B
C
C
Fig.2
Fig.3

MX-G68V/MX-G65V
1-18
OCW
9
2
0
Amp. board
0
9
ECW1
0
9
0
9
2
09
09
9
0
9
09
0
9
0
9
0
0
92
0
09
90
9
0
9
0
009
9
9
882
00
0
0
0
2
22
8
8
999
9
0
9
0
CON1
FCW3
JCW2
JCW3
JCW1
RCW6
FCW1
FCW2
HCW3
RW1 RW2
HCW2
Cassette mechanism
UCW1
UCW7
UCW2
UCW3
UCW4
UCW6
UCW5
RCW2
RFS2
Power transformer
RFS5 RFS6 RFS7 RFS8
PCW1
Front / Display board
3809-001222
3809-001237 3809-001228
AH39-00202A
AH39-00022A
AH39-00247A
AH39-00347A
3809-001185
AH39-00254A
3809-001224
CD key switch board
Front key switch board
Tuner board
Main board
H.phone J.board
Color codes are shown below.
1 Brown
2Red
3 Orange
4 Yellow
5 Green
6 Blue
7 Violet
8Gray
9 White
0Black
Wiring connection
AH39-00244A
RFS3
RFS4
CW5
CW2
Video CD board
AH39-00097A
VCW1
ACW1
ACW2
3809-001185
3708-000258
3711-003111
3711-003107
3711-000907
KCW2
KCW1
3711-001557
3708-001094
3711-000907
3708-000122
3711-001062
3809-000492
3708-001094
3711-001167
3708-000181
3708-001212
3708-000178
3708-000451
3708-001488
3708-000492
3809-001233
3711-000190
3711-000588
MCW2
MCW3
AH39-00248A
MIC board
Voice board
CW301
CW302
3710-000209
AH39-00246A
3711-001062
OPTICAL
AH39-00096B
CW1
3708-001027
0
CW7
MCW1
CW1
CW6 CD Pick up board
Motor board
CD pick up unit board
Roller board
CD tray

MX-G68V/MX-G65V
1-19
* Adjustment Location of Tuner PCB
AM(MW) OSC
Adjustment
Output 1~7.0 0.5V
Received FREQ.
Adjustment
point
531~1602 KHz
(9kHz step)
530~1600 KHz
(10kHz step)
MO
AM(MW) RF
Adjustment
ITEAM
594 KHz
MA
Maximum
Output(Fig1-4)
TESTER
MAIN
PCB VT GND
Fig 1-4 OSC Voltage
LW OSC
Adjustment
(Except for J/C)
146~290 KHz
LO
2~7.0 0.5V
AM(MW) RF
Adjustment
150 KHz
LA
Maximum
Output(Fig1-4)
Adjustment method
1. Tuner

MX-G68V/MX-G65V
1-20
FM THD Adjustment
Output
Output 28 dB( 2dB)
60 dB
Minumum Distortion (0.4% below)
(Figure 1-1)
SSG FREQ.
Adjustment
point
(FM DET)
98 MHz
FM DETECTOR COIL
FM Search Level Adjustment
Adjust SVR1 so that "TUNED" of FL T
is lighted (Figure 1-2)
Figure1-2 FM Auto Search Level Adjustment
*Adjust FM S.S.G level to 28dB
Figure1-1 IF CENTER and THD Adjustment
SSG FREQ.
Adjustment
point
(SVR1)
98 MHz
BEACON
SENSITIVITY
SEMI-VR(20K ) FM S.S.G GND
28 dB
FM S.S.G
Output
GND
Speaker
Terminal
FM
Antenna
Terminal
Distortion Meter
Input
SET
Input
output
Oscilloscope
FM IN
FM Antenna
SET
20 k
OUTPUT
AM SSG
450KHZ
INPUT
AM ANT
IN
Speaker Terminal
60cm
AM IF
VTVM Oscilloscope
AM(MW) I.F Adjustment
Maximum output (Figure 1-3)
SSG FREQ.
Frequency
Adjustment
point
450 kHz
531 kHz
(9kHz step)
530 kHz
(10kHz step)
AM IF
Figure1-3 AM I.F Adjustment
OUTPUT