JVC UX-A52 Manual de usuario
1-1
UX-A52
SERVICE MANUAL
MICRO COMPONENET SYSTEM
No.21074
Feb. 2002
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
UX-A52
UX-A52
Area Suffix
US ----------------- Singapore
UJ ---------------- U.S.Military
UP ----------------------- Korea
UW ------ Brazil,Mexico,Peru
Safety precautions
Preventing static electricity
Important for laser products
Disassembly method
Adjustment Method
Contents
Flow of functional operation
until TOC read (CD)
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-2
1-3
1-4
1-5
1-24
1-28
1-29
1-29
1-30~48
STANDBY/ON
COMPACT
DIGITALAUDIO
MICRO COMPONENT SYSTEM UX-A52
PHONES
COLOR
CLOCK
/TIMER FM MODE
DISPLAY
SOUND
MODE
AHB
PRO
SET
CANCEL
CD
DIMMER
FM/AM
REV.MODE
REPEAT
TAPE
STANDBY/ON
SLEEP
PLAYMODE
BEEP
VOLUME
RM-SUXA52U
AUX/MD
10
123
456
789
0
+
10
1-2
UX-A52
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 manufacturer`s 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 re-assembling.
5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling 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 ohms per volt or more
sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F 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 meausre 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.).
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.
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE
!
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.
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.
(This regulation does not correspond to J and C version.)
1-3
UX-A52
Preventing static electricity
1.Grounding to prevent damage by 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.
2.About the earth processing for the destruction prevention by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.
Be careful to use proper grounding in the area where repairs are being performed.
2-1 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.
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
3. Handling the optical pickup
1. 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.)
2. 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.
4.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. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it
Attention when traverse unit is decomposed
1.Solder is put up before the card wire is removed from connector on
the CD substrate as shown in Figure.
(When the wire is removed without putting up solder, the CD pick-up
assembly might destroy.)
2.Please remove solder after connecting the card wire with
when you install picking up in the substrate.
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the substrate.
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
CN601 on
mechanism
board
Shorting round
Shorting round
Flexible wire
1-4
UX-A52
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
laserradiation and is equipped with safety switches
whichprevent 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.
VARNING : Osynlig laserstrålning är denna del är öppnad
och spårren är urkopplad. Betrakta ej strålen.
VARO : Avattaessa ja suojalukitus ohitettaessa olet
alttiina näkymättömälle lasersäteilylle.Älä katso
säteeseen.
ADVARSEL : Usynlig laserstråling ved åbning , når
sikkerhedsafbrydere er ude af funktion. Undgå
udsættelse for stråling.
ADVARSEL : Usynlig laserstråling ved åpning,når
sikkerhetsbryteren er avslott. unngå utsettelse
for stråling.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
CLASS 1
LASER PRODUCT
!
CAUTION
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
1-5
UX-A52
Remove the nine screws A on the back of the body.
Remove the two screws B on the bottom of the
body.
Unlock the speaker terminal and the antenna
terminal, then remove the rear cover backward with
releasing the hooks.
1.
2.
3.
Disassembly method
<Main body>
Removing the rear cover
(See Fig.1 and 2)
Prior to performing the following procedure, remove
the rear cover.
Remove the two screws C attaching the side panels
on the bottom of the body.
Remove each side panel backward while releasing
the eight joints a as shown in Fig.4 and 5.
1.
2.
Removing the side panels
(See Fig.3 to 5)
Fig.1
A
A
A
A
Antenna terminal
Rear cover
Speaker terminal
Fig.2
Fig.3
Fig.4 Fig.5
Side panel (R)
Side panel (L)
Side panel (L)
Rear cover
B
B
Side panel (R)
Side panel (R)
Side panel (L)
C
C
Joint a
Joint aJoint a
Joint a
(Bottom)
1-6
UX-A52
Prior to performing the following procedure, remove
the rear cover and the side panels.
Remove the two screws Don each side of the body.
Release the two joints bon each side of the body
and remove the top panel in the direction of the
arrow.
Disconnect the card wires from connector CN705 on
the system control board on the left side of the body.
1.
2.
3.
Removing the top panel (See Fig.6 and 7)
Prior to performing the following procedure, remove
the rear cover, the side panels and the top panel.
Disconnect each wire from connector CN706, CN715
and CN716 on the system control board on top of the
body.
Remove the four screws Eretaining the cassette
mechanism assembly section on top of the body.
1.
2.
Removing the cassette mechanism
assembly section (See Fig.8)
Reference: If necessary, remove the
spacer marked hand the wire from the
Cassette mechanism assembly section.
REFERENCE:
Fig.7
Fig.8
Fig.6
Top panel
Top panel
D
CN705
D
System control board
CN715
System control board
CN706
E E
Joint b
Joint b
CN716
E
h (spacer)
Cassette mechanism section
1-7
UX-A52
Prior to performing the following procedure, remove
the rear cover and the right side panel.
Disconnect the card wire from connector CN1 on the
tuner board on the right side of the body.
Remove the screw Gand remove the tuner board
upward while disengaging the three joints c.
1.
2.
Removing the tuner board (See Fig.10)
Prior to performing the following procedure, remove
the rear cover, the side panels and the top panel.
Disconnect the card wire from connector CN701 and
the wire from connector CN706, CN715, CN716 on
the system control board.
Remove the screw Fon the left side of the body.
Disconnect connector CN709, CN711 and CN712 on
the system control board from the body outward.
Disconnect the card wire from connector CN704 on
the underside of the system control board.
1.
2.
3.
4.
Removing the system control board
(See Fig.9)
Fig.9
Fig.10
System control board
F
CN712 CN711 CN701
CN709
CN704
CN1
G
Joints c
Tuner board
CN715
CN716
CN706
1-8
UX-A52
Prior to performing the following procedure, remove
the rear cover, the side panels, the top panel and the
system control board.
Release the two joints don the lower right and left
sides of the front panel assembly, then remove the
front panel assembly toward the front.
1.
Removing the front panel assembly
(See Fig.11 and 12)
Prior to performing the following procedure, remove
the rear cover, the side panels, the top panel, the
system control board and the front panel assembly
section.
Disconnect the wire from connector CN804 on the
main board.
Remove the plastic rivet fixing the headphone jack
board.
1.
2.
Removing the headphone jack board
(See Fig.13 and 14)
Fig.11
Fig.12
Fig.14
Front panel assembly
Front panel assembly
Joint d
Joint d
Headphone jack board
Fig.13
Headphone jack board
Main board
CN804
Plastic rivet
1-9
UX-A52
Prior to performing the following procedure, remove
the rear cover, the side panels, the top panel, the
cassette mechanism assembly section and and the
system control board.
Disconnect the wire from connector CN804 on the
main board.
Remove the five screws H attaching the cassette
mechanism bracket.
Remove the screw G attaching the grounding
terminal extending from the main board.
Disconnect connector CN805 on the main board
from the AC jack board while pulling out it. Remove
the main board in the direction of the arrow and
disconnect the wire from connector CN803 on the
reverse side of the main board.
Remove the three screws Iattaching the heat sink
on the reverse side of the main board.
1.
2.
3.
4.
5.
Removing the main board / the heat sink
(See Fig.15 to 17)
Fig.15
Fig.16
Fig.17
H
Main board
CN805
CN803
Tuner board
Heat sink I
H
G
Main board
CN804
Cassette mechanism bracket
Main board
CN804
1-10
UX-A52
Prior to performing the following procedure, remove
the rear cover, the side panels, the top panel, the
cassette mechanism assembly section, the system
control board and the main board / the tuner board.
Disconnect the wire from connector CN809 on the
AC jack board.
Remove the screw Jand screw K attaching the AC
jack board.
1.
2.
Removing the AC jack board
(See Fig.18 and 19)
Prior to performing the following procedure, remove
the rear cover, the side panels, the top panel, the
cassette mechanism assembly section, the system
control board and the main board.
Disconnect the wire from connector CN809 on the
AC jack board.
Cut off the band setting the wire on the CD
mechanism cover.
Remove the four screws L attaching the power
transformer assembly.
1.
2.
3.
Removing the power transformer
assembly (See Fig.20)
Fig.18
AC jack board
CN809
K
J
Fig.19
AC jack board
CN809
Power transformer assembly
Fig.20
L
AC jack board
CN809
Power transformer
assembly
Band
L
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