JVC UXG-300, UXG-305, UXG-303 Service manual
SERVICE MANUAL
MB665<Rev.004>20089SERVICE MANUAL
UX-G300B, UX-G300E, UX-G300EN, UX-G300EV,
UX-G303E, UX-G303EN, UX-G303EV, UX-G305E,
UX-G305EN, UX-G305EV, UX-G300A, UX-G300US,
MICRO COMPONENT SYSTEM
UX-G300UF, UX-G300UT, UX-G300UW,
UX-G300UG, UX-G300UN, UX-G305UT
CA-UXG300
SP-UXG300
COPYRIGHT © 2008 Victor Company of Japan, Limited
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
Lead free solder used in the board (material : Sn-Cu, melting point : 230 Centigrade)
SP-UXG300
UX-G300EV
UX-G303EV
UX-G305EV
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
COPYRIGHT © 2008 Victor Company of Japan, Limited
No.MB665<Rev.004>
2008/9
SPECIFICATION
UX-G300 B/E/EN/EV
UX-G303 E/EN/EV
UX-G305 E/EN/EV
Amplifier section
OUTPUT POWER 60 W (30 W + 30 W) at 4 Ω (10% THD)
Speakers/Impedance 4 Ω - 16 Ω
Audio input AUDIO IN 500 mV/47 kΩ (at “IN LVL1”)
250 mV/47 kΩ (at “IN LVL2”)
125 mV/47 kΩ (at “IN LVL3”)
Digital input USB MEMORY
Tuner section
FM tuning range 87.50 MHz - 108.00 MHz
AM (MW) tuning range 522 kHz - 1 629 kHz
CD player section
Dynamic range 88 dB
Signal-to-noise ratio 85 dB
Wow and flutter Immeasurable
USB storage
USB specification Compatible with USB 2.0 Full Speed
Compatible device Mass storage class
Compatible file system "FAT16,FAT32"
Bus power supply Max. 500 mA
Speakers
Speaker units 10 cm cone x 1
Impedance 4 Ω
Dimensions (approx.) 160 mm x 250 mm x 150 mm (W/H/D)
Mass (approx.) 1.6 kg each
General
Power requirements "AC 230~,50 Hz"
Power supply to USB mass storage class device DC 5 V =500 mA
Power consumption 20 W (power on)
6.5 W (standby mode)
1 W or less (Save Mode)
Dimensions (W x H x D) 165 mm x 251 mm x 269 mm
Mass 2.6 kg
Specifications and appearance are subject to change without prior notice.
1-2 (No.MB665<Rev.004>)
UX-G300 US/UN/UB/UG/A/UW/UF/UT
UX-G305UT
Amplifier section
OUTPUT POWER 60 W (30 W + 30 W) at 4 Ω (10% THD)
Speakers/Impedance 4 Ω - 16 Ω
Audio input AUDIO IN 500 mV/47 kΩ (at “IN LVL1”)
250 mV/47 kΩ (at “IN LVL2”)
125 mV/47 kΩ (at “IN LVL3”)
Digital input USB MEMORY
Tuner section
FM tuning range 87.50 MHz - 108.00 MHz
AM (MW) tuning range 530 kHz - 1 710 kHz (in 10 kHz spacing)
531 kHz - 1 710 kHz (in 9 kHz spacing)
CD player section
Dynamic range 88 dB
Signal-to-noise ratio 85 dB
Wow and flutter Immeasurable
USB storage
USB specification Compatible with USB 2.0 Full Speed
Compatible device Mass storage class
Compatible file system FAT16, FAT32
Bus power supply Max. 500 mA
Speakers
Speaker units 10 cm cone x 1
Impedance 4 Ω
Dimensions (approx.) 160 mm x 250 mm x 150 mm (W/H/D)
Mass (approx.) 1.6 kg each
General
Power requirements AC 110 V - AC 240 V , 50/60 Hz
AC 240 V , 50 Hz (only Australia)
AC 220 V , 50 Hz (only Hong Kong)
Power supply to USB mass storage class device DC 5 V =500 mA
Power consumption 20 W (power on)
6.5 W (standby mode)
1 W or less (Save Mode)
Dimensions (W x H x D) 165 mm x 251 mm x 269 mm
Mass 2.6 kg
Specifications and appearance are subject to change without prior notice.
(No.MB665<Rev.004>)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 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, 1,000Ω per volt or more sensitivity
in the following manner. Connect a 1,500Ω 10W resistor
paralleled by a 0.15µF 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.).
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.
1-4 (No.MB665<Rev.004>)
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 laser products.
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.
(caption)
Anti-static wrist strap
1M
Conductive material
(conductive sheet) or iron palate
(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 pickup unit.
• Apply solder to the short land sections before the card wire is disconnected from the connecto on the servo board. (If the card wire
is disconnected without applying solder, the pickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land sections after connecting the card wire.
Solder short land section
(No.MB665<Rev.004>)1-5
1.8 Important for laser products
1.CLASS 1 LASER PRODUCT
2.CAUTION :
(For U.S.A.) Visible and/or invisible class II laser radiation
when open. Do not stare into beam.
(Others) Visible and/or invisible class 1M laser radiation
when open. Do not view directly with optical instruments.
3.CAUTION : Visible and/or invisible laser radiation when
open and inter lock failed or defeated. Avoid direct
exposure to beam.
4.CAUTION : This laser product uses visible and/or invisible
laser radiation and is equipped with safety switches which
prevent emission of radiation when the drawer is open and
the safety interlocks have failed or are defeated. 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 here in may result in
hazardous radiation exposure.
!
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
REPRODUCTION AND POSITION OF LABELS and PRINT
WARNING LABEL and PRINT
1-6 (No.MB665<Rev.004>)
SECTION 2
A
A
SPECIFIC SERVICE INSTRUCTIONS
New CD mechanism was added.
In a model using new CD mechanism for, it stick a blue label for identification on the back side.
When it repair the CD mechanism of an article sticking this label on, please use a parts list of FMU-VK1-2M.
label for identification
SECTION 3
DISASSEMBLY
3.1 Main body (Used figure are UX-G300E)
3.1.1 Removing the Metal Cover (See Fig.1, 2)
(1) Remove the seven screws A attaching the Metal cover.
(See Fig.1)
(2) Remove the two screws B attaching the both side of the
Metal cover. (See Fig.2)
A
B
Fig.2
Fig.1
(No.MB665<Rev.004>)1-7
3.1.2 Removing the Tuner pack (See Fig.3, 4)
(1) Disconnect the card wire from Tuner pack connected to
connector CN306
(2) Remove the two screws C attaching the Tuner pack. (See
Fig.4)
of the Micom board. (See Fig.3)
CN306
Fig.3
C
3.1.3 Removing the Rear panel (See Fig.5)
(1) Remove the five screws D attaching the Rear panel.
3.1.4 Removing the Amp board (See Fig.6)
(1) Disconnect the connector wire from Power board connect-
ed to connector CN640
(2) Disconnect the card wire from Amp board connected to
connector CN520 of the Micom board.
(3) Remove the one screw E attaching the Amp board.
of the Amp board.
CN520
Fig.4
D
Fig.5
E
1-8 (No.MB665<Rev.004>)
CN640
Fig.6
3.1.5 Removing the CD mechanism (See Fig.7 to 9)
(1) Disconnect the card wire from CD mechanism connected
to connector CN360
(See Fig.7)
(2) Disconnect the card wire from CD mechanism connected
to connector CN205
(3) Remove the two screws F attaching the CD mechanism.
(See Fig.8)
(4) Disconnect the connector wire from USB jack board con-
nected to connector CN802
(See Fig.9)
and CN362 of the Connection board.
of the Power board. (See Fig.7)
of the CD servo control board.
CN360CN362CN205
Fig.7
Fig.8
F
CN802
Fig.9
(No.MB665<Rev.004>)1-9
3.1.6 Removing the Mecha chassis (See Fig.10, 11)
(1) Remove the two screws G attaching the both side of the
Front panel. (See Fig.10)
(2) Disconnect the card wire from Connection board connect-
ed to connector CN311
of the Micom board. (See Fig.11)
G
Fig.10
CN311
Fig.11
1-10 (No.MB665<Rev.004>)
3.1.7 Removing the Front panel (See Fig.12 to 14)
(1) Disconnect the card wire from FL board connected to con-
nector CN304
(2) Disconnect the card wire from Volume board connected to
connector CN303
(3) Remove the two screws H attaching the Front panel. (See
Fig.13)
(4) Disengage two hooks a engaged both side of the Front
panel. (See Fig.14)
(5) Disengage one hook b engaged bottom side of the Front
panel. (See Fig.13)
of the Micom board. (See Fig.12)
of the Micom board. (see Fig.12)
CN304
CN303
Fig.12
HH
hook b
Fig.13
hook a
Fig.14
(No.MB665<Rev.004>)1-11
3.1.8 Removing the Micom board (See Fig.15, 16)
(1) Remove the two screws J attaching the Micom board. (See
Fig.15)
(2) Disconnect the flat cable wire from Micom board connected
to connector CN201
Fig.16)
(3) Disconnect the board to board connector connected to
connector CN204
(4) Disconnect the board to board connector connected to
connector CN803 of the USB jack board. (See Fig.16)
and CN203 of the Power board. (See
of the Power board. (See Fig.16)
J
Fig.15
CN204CN803 CN203
3.1.9 Removing the USB jack board (See Fig.17)
(1) Remove the three screws K attaching the USB jack board.
3.1.10 Removing the Power board (See Fig.17)
(1) Disconnect the power cord connected to connector CN200
of the Power board.
(2) Remove the four screws L attaching the Power board.
CN201
Fig.16
K
LL
1-12 (No.MB665<Rev.004>)
CN200
Fig.17
3.1.11 Removing the FL board (See Fig.18)
(1) Remove the seven screws M attaching the FL board.
3.1.12 Removing the Volume board (See Fig.18)
(1) Remove the volume knob.
(2) Remove the nine screws N attaching the Volume board.
M
N
N
Fig.18
(No.MB665<Rev.004>)1-13
3.2 CD mechanism assembly
• Remove the CD mechanism assembly from main body.
3.2.1 Removing the CD cover
(See Fig.1)
(1) Remove the two screws A attaching the CD cover from bot-
tom side of CD mechanism assembly.
(2) Lift up the CD cover from disengage boss a of the CD
mechanism assembly.
(3) Slide the CD cover to direction of the arrow and remove the
CD cover from fixing part of b.
(4) Remove the CD cover.
Boss a
A
Fixing part b
3.2.2 Removing the tray assembly
(See Fig.2 and 3)
• Remove the CD cover.
(1) Press slide cam and pull out the tray assembly to direction
of the arrow from right side of CD mechanism assembly.
(See Fig.2)
(2) Remove the two screws B attaching the tray assembly
from upper side of CD mechanism. (See Fig.3)
(3) Remove the bussing of the tray assembly from boss c of
the CD mechanism assembly and remove the tray assembly. (See Fig.3)
Tray assembly CD mechanism assembly
Slide cam
Fig.2
Boss a
A
CD mechanism assembly
Fig.1
Boss c
Boss c
B
Fig.3
CD cover
Bussing
Tray assemblyCD mechanism assembly
Fixing part b
1-14 (No.MB665<Rev.004>)
3.2.3 Removing the traverse mechanism assembly
(See Fig.4)
(1) Remove the four screws C attaching the traverse mecha-
nism assembly from bottom side of CD mechanism assembly.
(2) Disconnect the card wire from connector CN602
servo board and then take out the traverse mechanism assembly and CD servo board together.
Reference:
When reattaching the traverse mechanism assembly, the card
wire should through the part d.
of the CD
Card wire
d
CD mechanism assembly
CD servo board
C
Traverse mechanism assembly
Fig.4
C
CN602
(No.MB665<Rev.004>)1-15
3.2.4 Removing the CD servo board
(See Fig.5 and 6)
• Remove the traverse mechanism assembly.
(1) Remove the two screws D attaching the CD servo board
from bottom side of traverse mechanism assembly. (See
Fig.5)
(2) Remove the solder from solder part e of the CD servo
board. (See Fig.5)
(3) Remove the yellow wire from solder part f of the CD servo
board. (See Fig.5)
(4) Remove the white wire from solder part g of the CD servo
board. (See Fig.5)
(5) Remove the CD servo board to upper side, disengage the
hook c to direction of the arrow 1 then turn over the CD ser-
vo board. (See Fig.5)
(6) Solder to short land part j of pickup. (See Fig.6)
(7) Release the lock of connector CN601
row 2 and disengage the card wire. (See Fig.6)
Caution:
• Solder to short land part j of the pickup then disconnect the
card wire from connector CN601
disconnect the card wire before soldering, pickup is make
sure destroyed by static electricity. (See Fig.6)
• When reattaching the CD servo board, connect the card wire
to connector CN601 and then remove the solder of short
land part j of the pickup.
Solder part e
to direction of the ar-
of the CD servo board. If
Yellow wire
DD
CD servo board
CN601
22
Pickup
CN601
Hook c
White wire
Solder
part f
Solder
part g
1
Traverse mechanism assemblyCD servo board
Fig.5
1
Hook c
Short land part j
Traverse mechanism assembly
Fig.6
1-16 (No.MB665<Rev.004>)
3.2.5 Removing the pickup
(See Fig.7 to 9)
• Remove the traverse mechanism assembly.
(1) Remove the one screw E attaching the plate from upper
side of traverse mechanism assembly. (See Fig.7)
(2) Remove the plate from fixing part k then take out the plate.
(See Fig.7)
(3) Remove the two screws F attaching the LEAD spring and
then take out the LEAD spring. (See Fig.8)
(4) Take out the feed gear, and then remove the shaft of pick-
up from part m of the traverse mechanism assembly. (See
Fig.8)
(5) Remove the pickup from part n of the traverse mechanism
assembly and then take out pickup with shaft. (See Fig.8)
(6) Release the shaft from pickup. (See Fig.8)
(7) Solder the short land part p of the pickup. (See Fig.9)
(8) Release the lock of the connector to direction of the arrow,
and then disconnect the card wire. (See Fig9)
Caution:
• Solder to short land part p of the pickup then disconnect the
card wire from connector. If disconnect the card wire before
soldering, pickup is make sure destroyed by static electricity.
(See Fig.9)
• When reattaching the pickup, connect the card wire to con-
nector and then remove the solder from short land part p.
(See Fig.9)
Feed gear Shaft LEAD spring
Pickup
Short land part
p
F
Part n
Fig.8
Part m
3.2.6 Attaching the pickup
(See Fig.7 to 10)
• Please refer the "Removing the pickup".
(1) Connect the card wire to connector of pickup, and then re-
move the solder from short land part p of the pickup. (See
Fig.9)
(2) Attach the shaft to pickup. (See Fig.8)
(3) Fit the pickup to part n of the traverse mechanism and then
attach the end of the shaft to part k. (See Fig.8)
(4) Attach the LEAD spring and feed gear. (See Fig.8)
(5) Attach the plate. (See Fig. 7)
(6) One turn the LEAD gear to direction of the arrow 1 and fully
shift to direction of the arrow 2. (See Fig.10)
Plate
Fixing part k
E
Pickup Connector Card wire
Fig.9
LEAD gear
1
2
Traverse mechanism assembly
Fig.10
Pickup
Traverse mechanism assembly
Fig.7
(No.MB665<Rev.004>)1-17
3.2.7 Removing the feed motor
(See Fig.11 to 13)
• Remove the traverse mechanism.
(1) Remove the yellow wire from solder part q of the CD servo
board from upper side of traverse mechanism. (See Fig.11)
(2) Remove the white wire from solder part r of the CD servo
board. (See Fig.11)
(3) Remove the one screw G attaching the plate. (See Fig.12)
(4) Disengage the plate from fixing part s and take out the
plate. (See Fig.12)
(5) Remove the feed gear and take out the feed motor. (See
Fig13)
Reference:
When attaching the feed motor, the wire has to through the
part t of the traverse mechanism assembly. (See Fig.13)
Yellow wire
White wire
Soldered part q
Soldered part r
Feed gear Feed motor
Traverse mechanism assembly
Fig.13
part
t
Fixing part s
Traverse mechanism assembly
G
Traverse mechanism assemblyCD servo board
Fig.11
Plate
Fig.12
1-18 (No.MB665<Rev.004>)
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