JVC MXDVA5 - 3 DVD/CD Home Theater Mini System User manual

SERVICE MANUAL
COMPACT COMPONENT SYSTEM
No.20966
Jun. 2001
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
MX-DVA5
MX-DVA5
Area Suffix
Contents
Safety Precautions
Important for laser products
Preventing static electricity
Disassembly method
Wiring connection
Adjustment method
Troubleshooting
Description of major ICs
1-2
1-3
1-4
1-5
1-17
1-18
1-22
1-25~ 35
UG
US
UW
UY
Turkey, South Africa, Egypt
Singapore
Brazil, Mexico, Peru
Argentina
CD/ DVD Mechanism is exchanged by a unit (contain CPC cords).
SP-MXDVA5
CA-MXDVA5
SP-MXDVA5
PlayBack
Control
VIDEO CD
CLOCK
/ TIMER DISPLAY
PHONES
REPEAT
SELECT
REC START
/STOP
CD
REC START DUBBING
TUNING
TAPE B
DISC CHANGE
SOUND
MODE
SUBWOOFER
LEVEL
TAPE A
STANDBY/ON
STANDBY
(No MIC jack and MIC LEVEL volume for UY ver. )

MX-DVA5
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 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 each exposed 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.).
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 and C version)

MX-DVA5
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.
6.CAUTION : Use of controls, adjustments or performance of
procedures other than those specified herein may result in
hazardous radiation exposure.
POSITION OF LABELS
LASER CAUTION 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-DVA5
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
Because the CD mechanism assembly of this model is a unit
component, the individual component parts consisting of the
CD mechanism assembly are not supplied separately.
If you need to decompose the traverse unit, short-circuit the
connector of the flexible board by using a metal clip and the like
prior to decomposing the traverse unit.
CD travers unit
Flexible board
Metal clip
CD mechanism assembly

MX-DVA5
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/ DVD changer
unit.
Disconnect the harness from connector ACW4 and
DCW1 of the CD/ DVD servo board on the back of
the CD/ DVD changer unit.
Disconnect the harness from connector LCW2 and
LCW6 on the DVD power board.
Disconnect the card wire from connector UCW3 on
the FLdispaly & system control board.
Remove the two screws C attaching the CD/ DVD
changer unit on the back of the body.
Remove the two screws Dattaching the CD/ DVD
changer unit on the both side of the 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/ DVD 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)
CD/ DVD
servo
board
CD/ DVD changer unit
LCW6
LCW2
ACW4/ DCW1 DVD power
board

MX-DVA5
1-6
Prior to performing the following procedure, remove
the metal cover and the CD/ DVD 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/ DVD changer unit
CD/ DVD 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

MX-DVA5
1-7
Prior to performing the following procedure, remove
the metal cover and the CD/ DVD changer unit.
Remove the four screws Iattaching the heat sink
cover on the back of the body. Remove the heat sink
cover.
Remove the four screws Jattaching the heat sink,
AMP board and DVD power 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 AMP
board.
Disconnect the harness from connector LCW5 and
LCW4 on the DVD power board.
After moving the heat sink upward, remove the
claws. Then pull out the heat sink, AMP board and
DVD power board inward.
1.
2.
3.
4.
5.
6.
Removing the heat sink, AMP board and
DVD power board (See Fig.10 to 12)
Fig.8
Fig.9
Front panel assembly
G
E
Main board
HJoint 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
AMP board
ACW2
LCW5 LCW4
DVD power board

MX-DVA5
1-8
Prior to performing the following procedure, remove
the metal cover and CD/ DVD 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/ DVD changer unit, heat sink &
AMP board and tuner pack.
Remove the one screw M (Except UY), three screws
N and five 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/ DVD changer unit, heat sink &
AMP board tuner pack 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
(Except UY)

MX-DVA5
1-9
Prior to performing the following procedure, remove
the metal cover, CD/ DVD changer unit, heat sink,
AMP board and DVD power board.
Remove the four screws Pattaching the power ICs
to the heat sink.
Unsolder the power ICs solder point.
Remove the three screws Qand three screws R
attaching the DVD power board to the heat sink.
1.
2.
3.
Removing the power ICs and DVD power
board (See Fig.16 and 17)
Prior to performing the following procedure, remove
the metal cover, CD/ DVD changer unit, heat sink &
AMP board, tuner pack 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 Sattaching the power
transformer.
1.
2.
3.
Removing the power transformer
(See Fig .18)
Fig.17
Fig.16a
P
Heat sink
AMP board
Heat sink
Power ICs solder point
Fig.18
S
Q
Power cord
RCW2
PCW1
Power transformer
DVD power board
Fig.16b
DVD power board
AMP board
R
S
Heat sink

MX-DVA5
1-10
Disconnect the card wire from the connector UCW3,
UCW4,UCW5 and UCW6 on the FL & system control
board.
Remove the five screws Uattaching the FL & system
board.
Disconnect the card wire from the connector UCW2
on the FL & 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 / DVD switch board.
Remove the five screws Tattaching the power / DVD
switch board and release the tab coutward.
1.
2.
Prior to performing the following procedure, remove
the metal cover, the CD/ DVD changer unit and the
front panel assembly.
Removing the power / DVD switch board
(See Fig.19)
Prior to performing the following procedure, remove
the FL display & system control board.
No MIC board for UY version.
Pull out the volume knob, subwoofer level knob and
sound mode nob from front side.
Remove the eleven screws V attaching the front
board and release the two tabs doutward.
Release the two tabs eoutward and remove the mic
board.
1.
2.
Removing the front board / MIC board
(See Fig. 20 and 21)
<Front panel assembly>
Prior to performing the following procedure remove
the FLdisplay & 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 Wattaching 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
T
Power / DVD switch board
V
V
U
UFL diplay & system
control board
W
Front board
Card wire f
Sound mode knob
Volume knob
Subwoofer level
knob
Tab d
V
UCW2
UCW3
UCW4
UCW5
UCW6
U
UCW1
V
MIC board
Tab e
(Except UY)

MX-DVA5
1-11
Disconnect the card wire from connector SCW1 of
the CD servo board.
Turn the black loading pulley gear on the under side
of the CD/ DVD changer unit in the direction of the
arrow and draw the DVD tray toward the front until it
stops.
Disconnect the card wire from connector LCW1 of
the CD/ DVD servo board on the upper side of the
CD/ DVD changer unit.
Push down the two tray stoppers marked aand pull
out the DVD tray.
1.
2.
3.
4.
Align the gear-cam with the gear-tray as shown fig.3,
then mount the DVD tray.
When assembling the DVD tray, take extreme care
not engage with gear - synchro.
1.
2.
Prior to performing the following procedure, remove
the CD/ DVD changer unit.
Removing the DVD tray (See Fig.1 to 3)
Reinstall the DVD tray (See Fig.4 and 5)
<CD/ DVD changer unit>
Fig.2
Fig.1
Fig.3
Fig.4 Fig.5
Loading pulley
gear
DVD tray
DVD tray
DVD tray
Gear-convert
Gear-convert
Gear-cam
Gear-tray
Gear-synchro
Gear-tray
Gear-tray
Gear-cam
timing point
DVD tray
CD servo board
LCW1
a
(Tray stopper)
a(Tray stopper)
CD/ DVD
servo board
SCW1

MX-DVA5
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 DVD 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 DVD tray.
Detach the belt from the pulley on the upper side of
the CD/ DVD changer unit (Do not stain the belt with
grease).
Remove the two screws Cattaching the motor.
Disconnect the card wire from the connector SCW1
on the CD/ DVD servo board.
Remove the three screws Dattaching the CD/ DVD
serbo board .
1.
2.
3.
4.
Removing the belt, the CD/ DVD servo
board and the switch 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/ DVD changer unit
Motor
C

MX-DVA5
1-13
Disconnect the card wire from connector CN5 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/ DVD mechanism holder
assembly from behind in the direction of the arrow .
Pull out the CD/ DVD mechanism holder assembly.
1.
2.
3.
4.
Removing the CD/ DVD mechanism
holder assembly (mechanism included)
(See Fig.11 to 13)
Fig.10
CD/ DVD servo board
D
SCW1
E
CD/ DVD mechanism
holder assembly
Stopper
Fig.11
Motor board
CN5
Fig.13
CD/ DVD mechanism holder assembly CD/ DVD mechanism holder assembly
Fig.12
CD/ DVD changer unit

MX-DVA5
1-14
Fig.1
Fig.2
Fig.3
R/P Head
Stopper
Pinch roller
assembly
AB
Pinch roller Pinch roller
stopper
Pinch roller Pinch roller spring
Return spring
Return spring
Return spring
<Cassette mechanism section>
Removing the record/playback mechanism.
Removing the R/P head.
Remove the screw Aon the right side of the
R/P head.(Fig.1)
Remove the screw Bon the left side of the
R/P head.(Fig.1)
Removing the pinch roller.
Pull out the pinch roller by opening the pinch
roller stopper outward to unlock .(Fig.2)
When reassembling the pinch roller, refer to
fig. 3 to hook up the spring.
1.
2.
1.
2.

MX-DVA5
1-15
Remove the two screws Cfixing the motor.
Be careful to grease's splash when the
drive belt comes off.(Fig.4, Fig.5)
Unsolder the motor terminal.(Fig.4)
Removing the motor.
Removing the mechanism board.
Removing the flywheel.
Remove the cut-washers at c and dfrom the
capstan shaft, then remove the flywheel.
When reassembling the flywheel,
be sure to use new washers as they
cannot be reused. (Fig.7, Fig.8)
1.
2.
Unsolder the four parts aon the solenoid
coil terminal.(Fig.4)
Remove the two screws Dfixing the board.(Fig.4)
Unhook the three parts bfrom the board.(Fig.4)
Remove the mechanism board.(Fig.4)
1.
2.
3.
4.
Fig.4
Drive belt
Drive belt
Drive belt (Flat)
C
C
DD
abb
a
Motor
Motor
terminal
Motor
c
d
FR belt
FR belt
Washer
Capstan
washer
Flywheel
Flywheel
Flywheel
Capstan
washer
Mecha.
board
Fig.5
Fig.6
Fig.7 Fig.8
Sleeve
Sleeve

MX-DVA5
1-16
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-DVA5
1-17
OCW
9
2
0
Amp board
0
9
0
9
09
2
0
92
0
9
209
2
0
2
0
9
0
9
0
0
0
92
0
09
90
9
0
9
0009
9
9
882
000
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
AH39-00097A
3809-001185
AH39-00254A
3809-001224
CD key switch board
Front key switch board
Tuner board
Main board
E.phone J.board
Color codes are shown below.
1 Brown
2 Red
3 Orange
4 Yellow
5 Green
6 Blue
7 Violet
8Gray
9 White
0 Black
Wiring connection
AH39-00244A
AH39-00096C
RFS3
RFS4
LCW6
LCW4
LCW5 LCW2
LCW1
ACW2
CW1
VCW2
ACW4 DCW1
ACW3
DVD Power board
DVD 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
3711-000820
3708-000181
3708-001212 3708-000178
3708-000451
3708-001488
3708-000492
3809-001225
3711-000190
3711-003112
AH39-20008M
3711-000988 3711-000988
3711-001095
MCW2 MCW3
AH39-00248A
MIC board
Voice board
CW301
CW302
3710-000209

MX-DVA5
1-18
* Adjustment Location of Tuner PCB
AM(MW) OSC
Adjustment
Output 1~7.0 V
Received FREQ.
Adjustment
point
522~1611 KHz
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
146~290 KHz
LO
2~7.0 V
AM(MW) RF
Adjustment
150 KHz
LA
Maximum
Output(Fig1-4)
Adjustment method
1. Tuner

MX-DVA5
1-19
FM THD Adjustment
Output
Output 28 dB
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
522 kHz
AM IF
Figure1-3 AM I.F Adjustment
OUTPUT

MX-DVA5
1-20
(GND)
VTVM
2-1 To Adjust Tape Speed
1) Measuring tape : VT712(or equivalent)
(Tapes recorded with 3kHz)
2) Connect the cassette deck to the frequency counter
as in figure 1-5.
Notes
TAPE
SPEED
Control
1OUT
(connected
to the frequency
counter)
Turn VSR1 to
left and right
(FRONT PCB) 3KHz 30Hz
Remark
Standard
To Adjust
Pre-Setup
Item
Step Pre-Setup
Condition
1) Deck 1:VT712
2) Press PLAY
SW button
3) Deck 2:Same
as above
Cassette Deck
output
SPK OUT
Frequency Counter
Figure 1-5
Figure 1-6
SPK OUT
Recording /Play head
AZIMUTH control screw Figure 1-7
In Out
Cassette Deck Oscilloscope
2 Cassette Deck
Figure 1-8
Audio OSC.
SET
(MAIN PCB) Oscilloscope
AUX IN
LINE OUT
VTVM
IN
JCW3 IN OUT
TP
REVERSE PLAYREVERSE PLAY
(FORWORD)