JVC UXH-300, UXH-330, UXH-350 Service manual
SERVICE MANUAL
MICRO COMPONENT SYSTEM
MB29720047
UX-H300,UX-H330,UX-H350
UX-H300
Area suffix
US ------------------------ Singapore
UT ---------------------------- Taiwan
UW ----------- Brazil,Mexico,Peru
UX-H330
Area suffix
UT ---------------------------- Taiwan
UW ----------- Brazil,Mexico,Peru
UX-H350
Area suffix
UJ ---------------------- U.S.Military
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
COPYRIGHT © 2004 Victor Company of Japan, Limited
No.MB297
2004/7
SPECIFICATION
Amplifier Section Output Power 15 W per channel, min. RMS, driven into 4 Ω at 1 kHz with no more
than 10% total harmonic distortion. (IEC268-3)
Audio input sensitivity/Impedance (at 1 kHz) AUX:500 mV/50 kΩ
Speakers/Impedance 4 Ω - 16 Ω
Tuner FM tuning range 100 kHz intervals 87.5 MHz-108.0 MHz
50 kHz intervals 87.50 MHz-108.00 MHz
AM tuning range 10 kHz intervals 530 kHz-1 710 kHz
9 kHz intervals 531 kHz-1 710 kHz
CD player Dynamic range 85 dB
Signal-to-noise ratio 85 dB
Wow and flutter Immeasurable
Cassette deck Frequency response Normal (type I) 100 Hz-10 000 Hz
Wow and flutter 0.35% (WRMS)
General Power requirement AC 110 V-127 V / AC 220 V- 240 V (adjustable with the voltage se-
lector), 50 Hz / 60Hz
Power consumption 2 W (on standby) 40 W (at operation)
Dimensions (W/H/D) (approx.) 152 mm × 233 mm × 292 mm
Mass (approx.) 3.9 kg
Speaker Section Type Full range, bass-reflex type
Speakers 10 cm cone × 1
Power handling capacity 15 W
Impedance 4 Ω
Frequency range 100 Hz-15 kHz
Dimensions (W/H/D) (approx.) 147 mm × 233 mm × 189 mm
Mass (approx.) 1.9 kg each
Design and specifications are subject to change without notice.
1-2 (No.MB297)
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.
(No.MB297)1-3
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 flexible wire is disconnected from the connecto on the servo board. (If the flexible
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 flexible wire.
CD pickup board
1-4 (No.MB297)
Short-circuit point
1.8 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 CD,MD and DVD player uses 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
WARNING LABEL
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
CLASS 1
LASER PRODUCT
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
(No.MB297)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-6 (No.MB297)
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the front panel assembly
(See Fig.1 to 6)
(1) From the back of the body, remove the two screws A, and
the two screws B attaching the front panel assembly.
(2) Remove the six screws D on both sides of the body.
(3) Remove the screw E on the bottom of the body.
(4) Move the front panel assembly in the direction of the arrow
and remove. Disconnect connector CN402
main board and disconnect the wire from FM-ANT.
Caution:
When reassembling the front panel assembly, fit the right and
left tabs a to the notch.
, CN801 on the
CD mechanism assembly
Front panelh assembly
D
A
CD mechanism assembly
B
Rear cover assembly
Fig.2
CD mechanism assembly
Front panelh assembly
D
Rear cover assembly
Fig.1
Rear panel assembly
Fig.3
(No.MB297)1-7
Front panel assembly
E
Rear panel assembly
Fig.4
CD mechanism assembly
Joint a
Front panel assembly
CD mechanism assembly
FM-ANT
Main board
CN402
CN801
Rear cover assembly
Front panel assembly
Fig.6
Rear cover assembly
Fig.5
1-8 (No.MB297)
3.1.2 Removing the main board
(See Fig.7, 8)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Disconnect the wire from all connectors on the main board.
(2) Disconnect the wire from the two connectors on the cas-
sette mechanism assembly.
(3) Release the three bands attaching the wire to the main
board.
(4) Remove the two screws F from the front panel assembly.
Release the joint b.
Front panel assembly
CD mechanism assembly
Main board
CN203
CN303
CN602
CD mechanism assembly
CN103
CN401
CN301
CN603
CD mechanism assembly
b
Main board
Fig.7
F
Front panel assembly
band
Fig.8
(No.MB297)1-9
3.1.3 Removing the CD mechanism assembly
(See Fig.9, 10)
• Prior to performing the following procedure, remove the front
panel assembly and the main board.
(1) Release the four bands setting the wire.
(2) Disconnect the wire from the connector on the CD door
switch and from CN601
mechanism board respectively.
(3) Remove the three screws G attaching the CD mechanism
assembly.
(4) Release the joint d to remove the CD mechanism assem-
bly from the front panel assembly.
, CN603 and CN604 on the CD
Front panel assembly
G
Band
G
Band
CD door switch
CD mechanism assembly
CN601
CN604
Joint d
Joint d
G
CD mechanism board
CN603
Fig.9
CD mechanism assembly
Band
1-10 (No.MB297)
Front panel assembly
Fig.10
3.1.4 Removing the CD mechanism assembly
(See Fig.11 to 13)
• Prior to performing the following procedure, remove the front
panel assembly, the main board and the CD mechanism assembly.
Caution:
Before disconnecting the card wire from connector CN607
the CD mechanism board and from CD pickup board, solder
the short-circuit point on the CD pickup board. If you do not follow this instruction, the pickup may be damaged.
(1) Remove the four screws H attaching the CD mechanism
board.
(2) Move the CD mechanism board temporarily and discon-
nect the wire from connector CN606
(3) Solder the short-circuit point on the CD pickup board.
(4) Disconnect the card wire from connector CN607
mechanism board.
Caution:
Make sure to unsolder the short-circuit point after reconnecting
the card wire to the CD pickup board and to connector CN607
on the CD mechanism board.
CD mechanism board
CN606
.
on
on the CD
CD mechanism board
CN606
CN607
Card wire
H
Short-circuit point
CD mechanism assembly
Fig.12
CD pickupz board
H
CN607
CD mechanism assembly
Fig.11
Short-circuit point
Unsolder
Fig.13
(No.MB297)1-11
3.1.5 Removing the CD mechanism
A
(See Fig.14)
• Prior to performing the following procedure, remove the front
panel assembly, the main board, the CD mechanism assembly
and the CD mechanism board.
(1) Remove the four screws J attaching the CD mechanism.
J
CD mechanism
3.1.6 Removing the headphone board/ AUX board
(See Fig.15)
• Prior to performing the following procedure, remove the front
panel assembly, the main board and the CD mechanism assembly.
(1) Remove the screw K attaching the bracket and detach the
headphone board.
(2) Remove the screw M attaching the bracket and detach the
AUX board.
J
M
CD mechanism assembly
Fig.14
Bracket
K
1-12 (No.MB297)
UX board
Front panel assembly
Head phones board
Fig.15
3.1.7 Remove the LCD board
(See Fig.16, 17)
• Prior to performing the following procedure, remove the front
panel assembly, the main board and the CD mechanism assembly.
(1) From the front panel, pull out the volume knob and remove
the nut and the washer.
(2) Remove the twelve screws N attaching the LCD board.
Front panel assembly
Nat
Washer
Volume konb
N
Fig.16
N
LCD board
N
N
Fig.17
Front panel assembly
(No.MB297)1-13
3.1.8 Removing the cassette mechanism assembly
(See Fig.18, 19)
• Prior to performing the following procedure, remove the front
panel assembly and the main board.
(1) Push ‘PUSH OPEN’ on the front panel to open the cassette
door.
(2) Remove the screw P attaching the bracket of the cassette
mechanism assembly.
(3) Remove the two screws Q and the two screws R attaching
the cassette mechanism assembly.
PUSH OPEN
Cassette door
Front panel assembly
R
P
Fig.18
Front panel assembly
R
1-14 (No.MB297)
Bracket
QQ
Cassette mechaanism assembly
Fig.19
3.1.9 Removing the heat sink/power board
(See Fig.20 to 27)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) From the bottom of the rear cover, peel off the tape attach-
ing the wire extending from the power board and remove
the earth plate which is attached with the double-sided
tape.
(2) Remove the four screws T attaching the holder in the pow-
er unit section.
(3) Move the power unit section with the wire from the rear cov-
er temporarily. If necessary, release the band and unsolder
the wire on the power board.
(4) Remove the four screws U and the screw Y attaching the
holder.
(5) Release the wire from the band at ‘e’ and move the holder
in the direction of the arrow to release from the joint f.
(6) Remove the four screws A’ and two screws B’ attaching
the heat sink.
(7) Remove the two screws D’ attaching the power board.
Power unit section
T
Power unit section
T
T
T
Rear cover
Rear cover
Power trnsfomer assembly
Fig.21
Wire
earth plate
Ta pe
Fig.20
Rear cover
Ppwer unit section
Fig.22
(No.MB297)1-15
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