Jvc UXH30 User Manual
SERVICE MANUAL
MICRO COMPONENT SYSTEM
MB02420038
UX-H30
MICRO COMPONENT SYSTEM
Area Suffix
U ---------------- Other Areas
UP ---------------------- Korea
UT --------------------- Taiwan
UW ---- Brazil,Mexico,Peru
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
No.MB024
2003/8
SPECIFICATION
Amplifier Output Power 20 W (10 W + 10 W) at 4 Ω (10% THD)
Audio input sensitivity/Impedance (at 1 kHz) AUX 500 mV/48.75 kΩ
Speakers/Impedance 4 Ω
Tuner FM tuning range 87.50 MHz - 108.00 MHz
AM tuning range AM 10 kHz intervals 530 kHz - 1 710 kHz
AM 9 kHz intervals 531 kHz - 1 710 kHz
CD player Dynamic range 85 dB
Signal-to-noise ratio 90 dB
Wow and flutter Immeasurable
Cassette deck Frequency response Normal (type I) 50 Hz - 15 000 Hz
Wow and flutter 0.15% (WRMS)
Speaker Speaker units Full range 8.0 cm cone × 1
Impedance 4 Ω
Dimensions (approx.) 135 mm × 203 mm × 190 mm (W/H/D)
Mass (approx.) 1.7 kg each
General Power requirement AC IN 110 V/ 127 V/ 230 V ,
adjustable with the voltageselector,
50 Hz/ 60 Hz
DC IN 12 V, 4 A
Power consumption 35 W (at operation)
3.0 W (on standby)
Dimensions (approx.) 412 mm × 208 mm × 275 mm (W/H/D)
Mass (approx.) 6.5 kg
1-2 (No.MB024)
1.1 Safety Precautions
Good earth ground
d
AC VOLTMETER
SECTION 1
PRECAUTION
(1) This design of th is 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 exposed 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.).
(Having 1000
ohms/volts,
or more sensitivity)
0.15 F AC TYPE
Place this
probe on
1500 10W
1.2 Warning
(1) This equipment has been designed and manufactured to
meet international safety standards.
(2) It is the legal resp onsibility 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 compone nts 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 expose
metal part.
(No.MB024)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 dio de) 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 sh eet) 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 o f the laser diode on the replacem ent 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 CN601
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.
1-4 (No.MB024)
Flexible wire
Shorting round
Shorting round
CN601 on
mechanism
board
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 compact disc 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 de
feated. 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 herein 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 LABEL and PRINT
WARNING LABEL and PRINT
Caution label
(No.MB024)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-6 (No.MB024)
SECTION 3
A
A
A
DISASSEMBLY
3.1 Main body
3.1.1 Removing the rear pane l
(See Fig.1,2)
(1) From behind the body, remove the nine screws A attach-
ing the rear panel.
(2) Turing the body upside down, remove the two screws B at-
taching the rear panel, and remove.
3.1.2 Removning the side panel (L) and (R)
(See Fig.2~5)
• Prior to performing the following procedure, remove the rear
panel.
(1) Turning the body upside down, remove the two screws C
attaching the front panel assembly.
(2) Turning the body initial position, open the CD door while
pressing the upper OPEN button.
(3) Moving the side panel (L) in the arrow direction, remove the
panel from the left side of the body.
(4) Moving the side panel (R) in the arrow dire ction, remove
the panel from the right side of the body.
A
Fig.3
Side panel (L)
Rear panel
Fig.1
Front panel assembly
Fig.2
Fig.4
Side panel (R)
BB
CC
Fig.5
(No.MB024)1-7
3.1.3 Removing the CD player assembly
(See Fig.6,7)
• Prior to performing the following procedure, re move the rear
panel and the left and right side panels.
(1) Disconnect the card wires from the two connectors CN603
and CN604 on the CD servo control board.
(2) Remove the two screws D attaching the front panel as-
sembly on the both sides.
(3) Release the two joints a on the both sides of the front pan-
el assembly.
(4) Move the CD player assembly in the direction o f the arro w.
CD player assembly
a
D
CD servo control board
CN604
CN603
Fig.6
CD player assembly
a
Fig.7
D
1-8 (No.MB024)
3.1.4 Removing the power amplifier board and heat sink
(See Fig.8~10)
• Prior to performing the following procedure, remove the rear
panel, the left and right side panels, and the CD player assembly.
(1) Remove the five screws E and F attaching the heat sink.
(2) Disconnect the wire from connector CN901
supply board.
(3) Disconnect the card wire from connector CN305
power amplifier board.
(4) Remove the screw G attaching the power amplifier board.
(5) Disconnect the connector CN301
board, and release the two joints b .
REFERENCE:
Remove the screw F , then power amplifier board can be removed without removing heat sink.
on the power amplifier
on the power
on the
Power amplifier board
CN301
Heat sink
E
E
F
Fig.8
3.1.5 Removing the tuner board
(See Fig.11)
• Prior to performing the following procedure, remove the rear
panel, the left and right side panels, and the CD player assembly.
(1) Remove the screw H attaching the tuner board from the
right side of the body.
(2) Disconnect the card wire from th e connector CN1
tuner board.
(3) Release the joint c , and remove the tuner board backward.
on the
Power supply board
CN901
Fig.9
Power amplifier board
bb
G
Fig.10
c
CN305
CN1
H
Tuner board
Fig.11
(No.MB024)1-9
3.1.6 Removing the front panel assembly
(See Fig.12,13)
• Prior to performing the following procedure, re move the rear
panel the left and right side panels, the CD player assembly,
the power amplifier board.
(1) Disconnect the card wire from the connector CN714
LCD system CPU board.
(2) Release the joint d on the bottom of the front panel as-
sembly using a screwdriver, and remove the front panel assembly toward the front.
LCD system CPU board
CN714
on the
d
Front panel assembly
Fig.13
Fig.12
3.1.7 Remove the power transformer and power supply board
(See Fig.14,15)
• Prior to performing the following procedure, re move the rear
panel, the left and right side panels, the CD player assembly,
the power amplifier board and the tuner board.
(1) Remove the screw I attaching the jack holder and release
joint e , and then remove jack holder.
(2) Remove the four screws J attaching the power transformer
and power supply board.
e
Jack holder
Power supply board
J
Fig.15
Power transformer
J
1-10 (No.MB024)
I
Fig.14
3.1.8 Remove the cassette mechanism assembly
(See Fig.16,17)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Disconnect the card wire from the connector CN713
LCD system CPU board.
(2) Remove the four screws K and L attaching the cassette
mechanism assembly, and remove.
on the
Front panel assembly
CN713
LCD system CPU board
Fig.16
K
L
Cassette mechanism assembly
Fig.17
(No.MB024)1-11
3.1.9 Remove the LCD system CPU board
(See Fig.18)
(1) Disconnect the wire from the connector CN716
system CPU board.
(2) Release the two joints f and pull out the LCD system CPU
board.
on the LCD
f
CN716
LCD system CPU board
Fig.18
3.1.10 Removing the operating switch board
(See Fig.19,20)
• Prior to performing the following procedure, remove the front
panel assembly, the cassette mechanism assembly and the
LCD system CPU board.
(1) Remove the two screws M attaching the operating sw itch
button.
(2) Remove the two screws N attaching the operating switch
board, and remove.
M
Operating switch button
Fig.19
N
1-12 (No.MB024)
Operating switch board
Fig.20
3.2 Cassette mechanism assembly
3.2.1 Removing the Play/Record & Clear he ad
(See Fig.1~3)
(1) While moving the trigger arm on the right side of the he ad
mount in the direction of the arrow, turn the flywheel R
counterclockwise until the head mount comes ahead and
clicks.
(2) The head turn s counterclockwise as you turn the flywheel
R counterclockwise (See Fig.2 and 3).
(3) Disconnect the flexible wire from connector CN31
head amplifier & mechanism control board.
(4) Remove the spring from the back of the head.
(5) Loosen the azimuth screw for reversing attaching the head.
(6) Remove the head on the front side of the head mount.
on the
Cassette mechanism assembly
Fig.1
Head
Fly wheelR
Trigger armHead mount
Flexible wire
Fly wheel R
Fig.2
Azimuth screw
Head
for reversing
Spring
CN31
Head amplifer & mecha control board
Fig.3
(No.MB024)1-13
3.2.2 Removing the head amplifier & mechanism control board
(See Fig.4)
(1) Turn over the cassette mech anism assembly and remove
the three screws A attaching the head amplifier & mechanism control board.
(2) Disconnect the flexible wire fro m connector CN31
head amplifier & mechanism control board.
(3) Disconnect connector CN32
anism control board from connector CN1
board.REFERENCE: If necessary, unsolder the 4-pin wire
soldered to the main motor.
3.2.3 Removing the main motor
(See Fig.4~7)
(1) Remove the two screws B .
(2) Half raise the motor and remove the capstan belt from the
motor pulley.
ATTENTION:
Be careful to keep the capstan belt from grease. When reassembling, refer to Fig.6 and 7 for attaching the capstan belt.
Head amplifier & mecha control board
of the head amplifier & mech-
on the reel pulse
on the
Main motor assembly
Capstan belt
Fig.5
Main motor assembly
CN31
Flexible wire
A
AA
Fig.4
CN32
4pin wire
B
Main motor assembly
Motor pulley
Capstan belt
Fig.6
Main motor assembly
Fly wheel
1-14 (No.MB024)
Capstan belt
Motor pulley
Fig.7
3.2.4 Removing the flywheel
(See Fig.8, 9)
• Prior to performing the following procedure, remove the head
amplifier & mechanism control board and the main motor assembly.
(1) From the front side of the cassette mechanism, remove the
slit washers attaching the capstan shaft L and R. Pull out
the flywheels backward.
Fly wheel R Fly wheel L
Fig.8
Fly wheel R
Capstan shaft R Capstan shaft L
Slit washer
Fig.9
3.2.5 Removing the reel pulse board and solenoid
(See Fig.10)
• Prior to performing the following procedure, remove the head amplifier & mechanism control board.
(1) Remove the screw C.
(2) Release the tab a, b, c, d and e retaining the reel pulse board.
(3) Release the tab f and g attaching the solenoid on the reel pulse board.
(4) The reel pulse board and the solenoid come off.
Fly wheel L
bc
a
Solenoid
g
f
d
Reel pulse board
C
e
Fig.10
(No.MB024)1-15
3.2.6 Reattaching the Play/ Record & Clear head
r
r
(See Fig.11~13)
(1) Reattaching the head mount assembly.
a) Change front of the direction cover of the head
mount assembly to the left (Turn the head forward).
b) Fit the bosses O', P', Q', U' and V' on the head mount
assembly to the holes P and V, the slots O, U and Q
of the mechanism sub assembly (See Fig.11 to 13).
CAUTION:
To remove the head mount assembly, turn the direction
cover to the left to disengage the gear. If the gear can not
be disengaged easily, push up the boss Q' slightly and
raise the rear side of the head mounts slightly to return
the direction lever to the reversing side.
(2) Tighten the azimuth screw for reversing.
(3) Reattach the spring from the back of the Play/ Record &
Clear head.
(4) Connect the flexible wire to con nector CN31
amplifier & mechanism control board.
on the head
U' Q'
Head mount assembly
Head mount assembly
O'
Fig.11
P'
P'
V'
V'
Direction cove
Spring
Flexible wire
V
O
P
Q
Head
Direction cove
U
Fig.12
Azimuth screw for reversing
Head mount
1-16 (No.MB024)
CN31
Fig.13
Head amplifier &
mechanism control board
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