Jvc UX-HB4 Service Manual
MB330200410
SERVICE MANUAL
MICRO COMPONENT SYSTEM
UX-HB4
Area suffix
B ------------------------------ U.K.
CA-UXHB4 SP-UXHB4SP-UXHB4
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
COPYRIGHT © 2004 Victor Company of Japan, Limited
No.MB330
2004/10
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 DAB tuning range Band lll 174.928 MHz - 239.200 MHz
FM tuning range 87.50 MHz - 108.00 MHz
AM (MW) tuning range 522 kHz - 1 629 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 230 V , 50 Hz
Power consumption 40 W (at operation) 2 W (on standby)
Dimensions (W/H/D) (approx.) 152 mm × 233 mm × 297 mm
Mass (approx.) 4.0 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.MB330)
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.MB330)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.MB330)
1.6 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.
1.6.1 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.
1.7 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.
1.8 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.
Card wire
CD pickupz board
Unsolder
Short-circuit point
(No.MB330)1-5
1.9 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)
1-6 (No.MB330)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
(No.MB330)1-7
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the front panel assembly
(See Fig.1 ~ 6)
(1) Disconnect the antenna cord on the back of the body.
(2) Remove the two screws A, the two screws B and the two
screws D on the back of the body respectively.
(3) Remove the six screws E on both sides of the body.
(4) Remove the screw F on the bottom of the body.
(5) 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 joints a to the notch.
, CN801 on the
CD mechanism assembly
Front panelh assembly
E
A
CD mechanism assembly
Antenna cord
Rear cover assembly
Fig.2
CD mechanism assembly
Front panelh assembly
D
E
B
Rear cover assembly
1-8 (No.MB330)
Fig.1
Rear panel assembly
Fig.3
Front panel assembly
F
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
(No.MB330)1-9
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 two bands attaching the wire to the main
board.
(4) Remove the two screws G from the front panel assembly.
Release the joint b.
Front panel assembly
CD mechanism assembly
Main board
CN203
CN303
CN301
CD mechanism assembly
CN103
CN302
CN403
CN401
CD mechanism assembly
Joint b
Main board
Fig.7
G
Front panel assembly
Band
Fig.8
1-10 (No.MB330)
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 connector CN607
mechanism board respectively.
(3) Remove the three screws H attaching the CD mechanism
assembly.
(4) Release the joint d to remove the CD mechanism assem-
bly from the front panel assembly.
on the CD
CD mechanism assembly
Front panel assembly
H
Band
H
Band
Joint d
Joint d
H
Band
CD mechanism board
CN607
Fig.9
CD mechanism assembly
Front panel assembly
Fig.10
(No.MB330)1-11
3.1.4 Removing the CD mechanism assembly
(See Fig.11 ~ 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 CN608
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) Disconnect the wire from connector CN602
the CD mechanism board.
(2) Remove the four screws J attaching the CD mechanism
board.
(3) Move the CD mechanism board as shown in the figure 12
and solder the short-circuit point on the CD pickup board.
(4) Disconnect the card wire from connector CN608
mechanism board.
CAUTION:
Make sure to unsolder the short-circuit point after reconnecting
the card wire to the CD pickup board and to connector CN608
on the CD mechanism board.
and CN609 on
on
on the CD
CD mechanism board
Card wire
CN602
CN608
CD mechanism board
CN609
J
CN608
CD mechanism assembly
Short-circuit point
CD mechanism assembly
Fig.12
Card wire
CD pickupz board
J
CN602
Fig.11
1-12 (No.MB330)
Short-circuit point
Unsolder
Fig.13
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 K attaching the CD mechanism.
K
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 M attaching the bracket and detach the
headphone board.
(2) Remove the screw N attaching the bracket and detach the
AUX board.
N
K
CD mechanism assembly
Fig.14
Bracket
M
UX board
Front panel assembly
Fig.15
Head phones board
(No.MB330)1-13
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 P attaching the LCD board and
remove the screw Q setting the wire.
Front panel assembly
P
Q
Volume konb
Nat
P
Washer
Fig.16
LCD board
P
1-14 (No.MB330)
P
Fig.17
Front panel assembly
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 R attaching the bracket of the cassette
mechanism assembly.
(3) Remove the two screws S and the two screws T attaching
the cassette mechanism assembly.
PUSH OPEN
Cassette door
Front panel assembly
S
R
Fig.18
Front panel assembly
S
Bracket
T
Cassette mechaanism assembly
Fig.19
T
(No.MB330)1-15
3.1.9 Removing the heat sink/power board
(See Fig.20 ~ 27)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the four screws U attaching the holder in the pow-
er unit section.
(2) 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.
(3) Remove the four screws Y and the screw A’ attaching the
holder.
(4) Release the wire from the band e and move the holder in
the direction of the arrow to release from the joint f.
(5) Remove the four screws B’ and two screws D’ attaching
the heat sink.
(6) Remove the two screws E’ attaching the power board.
3.1.10 Removing the power transformer assembly
(See Fig.27, 28)
• Prior to performing the following procedure, remove the front
panel assembly and the power unit section.
(1) Remove the four screws F’ attaching the power transform-
er assembly. The bracket comes off at the bottom of the
rear cover.
(2) Remove the screw G’ attaching the power cord folder.
(3) Remove the two screws H’ attaching the AC connector
board.
Rear cover
Ppwer unit section
Fig.21
3.1.11 Removing the FM antenna board
(See Fig.28)
• Prior to performing the following procedure, remove the front
panel assembly and the power unit section.
(1) From the rear cover assembly, remove the screw J’ attach-
ing the FM antenna board.
(2) From the FM antenna board, unsolder the FM antenna
wire.
U
Power unit section
U
U
U
Heat sink
Y
Holder
Power board
Fig.22
Y
Band
Rear cover
1-16 (No.MB330)
Power trnsfomer assembly
Fig.20
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