Jvc UX-GD7 Service Manual
SERVICE MANUAL
MICRO COMPONENT SYSYTEM
MB42220058
UX-GD7
Area suffix
B ------------------------------ U.K.
E ---------- Continental Europe
EN ----------- Northern Europe
EV ------------- Eastern Europe
EE -------- Russian Federation
CA-UXGD7 SP-UXGD7SP-UXGD7
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
TABLE OF CONTENTS
1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
COPYRIGHT © 2005 Victor Company of Japan, Limited
No.MB422
2005/8
SPECIFICATION
Amplifier section Output power 140 W (70 W + 70 W) at 6Ω(10% THD)
Analog input AUX Sensitivity/Impedance (at 1 kHz): 400 mV/47 kΩ
USB input USB Ver.1.1
Digital output OPTICAL DIGITAL OUT -21 dBm to -15 dBm (660 nm ±30 nm)
VIDEO OUT Color system PAL
Video (composite) 1 V(p-p)/75Ω
S-video Y (luminance): 1 V(p-p)/75Ω
C (chrominance, burst): 0.3 V(p-p)/75Ω
RGB 0.7 V(p-p)/75Ω
COMPONENT (Y): 1 V(p-p)/75Ω
(PB/PR): 0.7 V(p-p)/75Ω
Speaker terminals Impedance 6Ω- 16Ω
Tuner section FM tuning range 87.50 MHz - 108.00 MHz
AM tuning range 522 kHz - 1 629 kHz
Disc player section Playable disc DVD Video/DVD Audio
CD/VCD/SVCD
CD-R/CD-RW (recorded in Audio CD/
Video CD/Super Video CD/MP3/JPEG/DivX format)
DVD-R (recorded in video/MP3/JPEG/DivX format)
DVD-RW/DVD-RAM (recorded in video/DVD-VR/MP3/JPEG/DivX
format)
Horizontal resolution 500 lines
Wow and flutter Immeasurable
General Power requirement AC 230 V , 50 Hz
Power consumption 150 W (at operation)
1.3 W (on standby)
Dimensions (approx.) 189 mm × 224 mm × 406 mm(W/H/D)
Mass (approx.) 6.5 kg
Speakers Type 2-way Bass-reflex type, Magnetically shielded
Speaker systems Woofer 12 cm cone × 1
Tweeter 4 cm cone × 1
Power handling capacity 70 W
Impedance 6Ω
Frequency range 45 Hz - 20 000 Hz
Sound pressure level 84 dB/W·m
Dimensions (approx.) 165 mm × 286 mm × 237 mm(W/H/D)
Mass (approx.) 2.8 kg each
Design and specifications are subject to change without notice.
1-2 (No.MB422)
SECTION 1
PRECAUTIONS
1.1 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 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 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 reassembling.
(5) Leakage shock hazard testing
After reassembling 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
in the following manner. Connect a 1,500
paralleled by a 0.15
exposed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
Ω per volt or more sensitivity
Ω 10W resistor
µF AC-type capacitor between an
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.).
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
0.15 F AC TYPE
Place this
probe on
1500 10W
Good earth ground
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 preforming 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)
each exposed
metal part.
(No.MB422)1-3
1.5 Safety Precautions (U.K only)
(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-
tinued 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.
(2) Any unauthorised design alterations or additions will void the manufacturer's guarantee; furthermore the manufacturer cannot
accept responsibility for personal injury or property damage resulting therefrom.
(3) Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never
be replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts in
the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts
other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts
shown in the Parts List of the Service Manual and 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.
1.5.1 Warning
(1) Service should be performed by qualified personnel only.
(2) This equipment has been designed and manufactured to meet international safety standards.
(3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(4) Repairs must be made in accordance with the relevant safety standards.
(5) It is essential that safety critical components are replaced by approved parts.
(6) If mains voltage selector is provided, check setting for local voltage.
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.
1-4 (No.MB422)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
(No.MB422)1-5
SECTION 3
DISASSEMBLY
3.1 Disassembly of the main blocks of the set
Replacement of the fuses and the power IC.
3.1.1 Replacing the fuses
(See Fig. C)
• Prior to performing the following procedure, remove the rear
cover.
(1) Replace the fuses inside.
Caution:
Be sure to use fuses with the specified ratings.
FUSE
(Location:F901)
Value: T1.25AL 250V
3.1.2 Replacing the power IC
(See Fig. D)
• Prior to performing the following procedure, remove the rear
cover.
(1) Remove the two screws H from the heat sink between the
power IC.
(2) Remove the solder fixing the power IC.
Fig.C
H
Fig.D
1-6 (No.MB422)
3.2 MAIN BODY
A
A
A
3.2.1 Removing the Metal Side Left and the Metal Side Right
(See Fig. 1-1, Fig. 1-2 and Fig. 1-3)
(1) Unscrew the 10 screws A from the Rear Panel, the Top
Cover and the Chassis Main.
(2) Remove the Metal Side Left and the Metal Side Right.
Fig.1-1
Fig.1-2
Fig.1-3
(No.MB422)1-7
3.2.2 Removing the Top Cover
(See Fig. 2-1, Fig. 2-2 and Fig. 2-3)
(1) Unscrew the 2 Screws B and 2 Screws C.
(2) Removing the Top Cover.
B
Fig.2-1
B
C
Fig.2-2
Fig.2-3
1-8 (No.MB422)
3.2.3 Removing the Cabinet Front
r
(See Fig. 3-1, Fig. 3-2, Fig. 3-3 and Fig. 3-4)
(1) Unscrew the 3 Screws D from the Chassis Main.
(2) Pulling out the 3 cable connectors from the Main Board unit
and the AMP Board unit then removing the Cabinet Front.
D
Fig.3-1
D
Fig.3-3
Connector
Fig.3-2
Connector
Connecto
Fig.3-4
D
(No.MB422)1-9
3.2.4 Removing the Cover Heat Sink and the Fan
(See Fig.4-1, Fig.4-2 and Fig.4-3)
(1) Unscrew the 5 Screws E from the Chassis Main and the
Rear Panel.
(2) Pulling out the cable connector from the AMP Board then
removing the Cover Heat Sink and the Fan.
(3) Unscrew the 4 Screws M from the Fan.
(4) Removing the Fan.
E
E
E
E
E
Fig.4-1
CONNECTOR
1-10 (No.MB422)
Fig.4-2
M
Fig.4-3
3.2.5 Removing the Rear Panel the Tuner and the Speaker Board
(See Fig.5-1, Fig.5-2 and Fig.5-3)
(1) Unscrew the 15 screws C from the Main Board unit, the
Tuner, the Heat Sink, the Chassis Main and the scart
Board unit.
(2) Pulling out the 2 cable connectors from the AMP Board unit
and the Power Board unit then removing the Panel Rear,
the Tuner and the Speaker Board.
C
C
Fig.5-1
CONNECTOR
Fig.5-2
Fig.5-3
CONNECTOR
(No.MB422)1-11
3.3 CABINET FRONTCHASSIS MAIN ASSEMBLY
3.3.1 Removing the Knob Volume, the Display Board and the USB Board
(See Fig.6-1 and Fig.6-2)
• Prior to performing the following procedure before removing
the Display Board.
(1) Pulling out the Knob Volume from the Display Board.
(2) Unscrew the 15 screws F from the Cabinet Front, then tak-
ing out the Display Board and the USB Board.
KNOB VOLUME
Fig.6-1
Fig.6-2
F
1-12 (No.MB422)
3.3.2 Removing the Main Board and the Power Board
(See Fig.7-1, Fig.7-2, Fig.7-3 and Fig.7-4)
(1) Pulling out the 5 cable connectors from Main Board unit
and the Power Board unit.
(2) Unscrew the 4 screws G from the Mechanism Holder.
(3) Separating the Main Board and the Power Board from the
AMP Board vertically.
CONNECTOR
G
Fig.7-3
Fig.7-1
CONNECTOR
Fig.7-2
G
Fig.7-4
(No.MB422)1-13
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