SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
No.MB080
2004/1
COMPACT COMPONENT SYSTEM
MB080
2003
12
MX-GA8
TABLE OF CONTENTS
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
SP-MXGA8
SP-MXGA8
CA-MXGA8
CD
1
DISC CHANGE
DISPLAY
CD
2
CD
3
TUNING
STANDBY
RANDOM
PROGRAM
DUBBING
REC START
/ STOP
CD REC
START
SET
CLOCK
/ TIMER
CANCEL
/ DEMO
SOUND
TURBO
TAPE A /B
REPEAT
PHONES
TUNING
COMPACT
COMPONENT
SYSTEM
MX-GA8
ROCK
PO P
CLASSIC
DA NCE
HALL
STADIUM
SO
UND MODE
V O L U M E
EJECT
EJECT
SUBWOOFER LEVEL
PRESET
STANDBY/ON
BEEP
Area Suffix
JW ------- Mexico,Panama
1-2 (No.MB080)
SPECIFICATION
Design and specifications are subject to change without notice.
Amplifier section Output Power
SUBWOOFERS
120 W per channel, min. RMS, driven into 6
at 63 Hz with no more
than 10% total harmonic distortion.
MAIN SPEAKERS 60 W per channel, min. RMS, driven into 4
at 1 kHz with no more
than 10% total harmonic distortion.
Audio input sensitivity/
Impedance
(at 1 kHz, measured at
MAIN SPEAKERS)
AUX
400 mV/50 k
Speakers/Impedance
Subwoofers
6
- 16
Main speakers
4
- 8
Tuner
FM tuning range
87.50 MHz - 108.00 MHz
AM tuning range
530 kHz - 1 710 kHz
CD player
CD Capacity
3 CDs
Dynamic range
85 dB
Signal-to-noise ratio
85 dB
Cassette deck
Frequency response
Normal (type I)
50 Hz - 14 000 Hz
Wow and flutter
0.15% (WRMS)
General
Power requirement
AC 120 V , 60 Hz
Power consumption
160 W (at operation)
18 W (on standby)
Dimensions (approx.)
270 mm
× 317 mm × 453 mm (W/H/D)
Mass (approx.)
8.8 kg
Speaker section Type
3-way bass-reflex type
Speaker units
Subwoofer
13.5 cm cone
×1
Main Woofer
16 cm cone
×1
Tweeter
5 cm cone
×1
Power handling capacity Subwoofer
120 W
Main speaker
60 W
Impedance
Subwoofer
6
Main speaker
4
Frequency range
Subwoofer
30 Hz - 70 Hz
Main speaker
70 Hz - 20 000 Hz
Sound pressure level
Subwoofer
73 dB/W
·m
Main speaker
86 dB/W
·m
Dimensions (approx.)
290 mm
× 317 mm × 336 mm (W/H/D)
Mass (approx.)
5.5 kg each
(No.MB080)1-3
SECTION 1
PRECAUTION
1.1
Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purpos-
es. 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 per-
formed 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 manufacturers 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 characteris-
tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us-
ing replacement components rated for higher voltage, watt-
age, etc. Replacement parts which
have these special
safety characteristics are identified in the Parts List of Ser-
vice 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 charac-
teristics 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 reassem-
bling.
(5) Leakage shock hazard testing
After reassembling the product, always perform an isola-
tion check on the exposed metal parts of the product (an-
tenna 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, particular-
ly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage cur-
rent 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
per volt or more sensitivity
in the following manner. Connect a 1,500
10W resistor
paralleled by a 0.15
µF AC-type capacitor between an ex-
posed 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.).
1.2
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.
1.3
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 pre-
forming repair of this system.
1.4
Critical parts for safety
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.
(This regulation dose not Except the J and C version)
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
1-4 (No.MB080)
1.5
Preventing 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.
1.5.1
Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.
Be careful to use proper grounding in the area where repairs are being performed.
(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) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(3) Handling the optical pickup
· 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.)
· 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.
1.6
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) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.7
Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the CD pickup unit.
· Apply solder to the short land sections before the flexible wire is disconnected from the connector on the CD servo board. (If the
flexible wire is disconnected without applying solder, the CD pickup may be destroyed by static electricity.)
· In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap
Soldering
Card wire
Card wire
Picup unit
connector
Picup unit
connector
CD changer unit
CD changer
mechanism
(No.MB080)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.