JVC UX-A4 User manual

JVC
_ SERVICE MANUAL
Contents
COMPACT
DIGITAL AUDIO
i
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Area suffix :
| Ce U.K.
PTE. sekat se Continental Europe
1 Ge Germany i
ltaly
Northern Europe
Page Page
Safety Precautions ......0..... ugh lweleeucenumuaeasiasenens 2 9] Block Diagram ...........ccccscceceeee eidinusnaiepedaceces sane OF
Safety Precautions about UX-A4 ..... cece 3 10) Wiring Connections .......00... 0c cece eee sasedoetedas 48
PPBATICES” oni. eececsnstisiita et ndemmianGy 5 [ii] Standard Schematic Diagram ............. acu ve 50
[4] Specifications ............ Soe uNcl tages weaweebu stan seequleaz cane 5 (i2, Location of P.C. Board Parts .0..........ce eee eee . 57
[5] Instructions (Extract) ....... Seach se seviaiha seh sen¥eeSen eee 6 [13] Electrical Parts List ............ teatveneas soudawer ss eaReeces 65
[6| Location of Main Parts .......... debethicatvaset cans 23 [14] llustration of Packing and Parts List ....-....0.... 74
Removal of Main Parts and Parts List ....00.0....... 24 [15] Accessories occ seceennmemnnnattesees ree FB
Main Adjustments ................. Pia teeeieess isbesedee 39
No. 1890
July 1993
~ UX-A4 B/E/G/GI/EN

UX-A4 B/E/G/GI/EN
2
1. Safety Precautions
1. The design 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. Service 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
manufacture'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
product
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(
/\
_)on
the
schematic
diagram
and
parts
list
in
the
service
manual.
The
use
of
a
substitute
replacement
which
does
not
have
the
same
safety
characteristics
as
the
recommended
replacement
part
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,
mpving
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 current 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
part
of
the
cabinet,
particulary
any
exposed
metal
part
having
a
return
path
to
the
chassis,
to
a
known
good
earth
ground.
Any
leakage current must not exposeed 0.5mA AC(r.m.s.)
AC VOLTMETER
Alternate
check
method
Fr
{Having
1000
ohms/volt,
Plug
the
AC
line
cord
directly
into
the
AC
outlet.
Use
an
AC
voltmeter
or
more
sensitivity.)
having 1,000 ohms per volt or more sensitivity in the following
manner. Connect a 1,500 ohms 10W resistor paralleled by a 0.15 F
AC
type
capacitor
between
an
exposed
metal
part
and
a
known
good
Place
this
probe
earth
ground.
Measure
the
AC
voltage
across
the
resistor
with
the
AC
:
on
each
expared
1500
2
10W
metal
part.
voltmeter.
Move
the
resistor
connection
to
each
exposed
metal
part,
particularly any exposed metal part having a return path to the Good earth ground
chassis,
and
measure
the
AC
voltage
across
the
resistor.
Now,
reverse
the
plug
in
the
AC
outlet
and
repeat
each
measurement.
Any
voltage measured must not exceed 0.75V AC(r.m.s.).This corresponds to 0.5mA AC(r.m.s.).
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 maintaintaind.
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.
(No. 1890)

UX-A4 B/E/G/GI/EN
2.
Safety
Precaution
about
UX
—
A4
THEIR
LOCATION
PRECAUTIONS
1,
CLASS
1
LASER
PRODUCT
2.
DANGER:
Invisible
laser
radiation
when
open
and
interlock
failed
or
defeated.
Avoid
direct
exposure
to
beam.
3.
CAUTION:
Do
not
open
the
rear
cover.
There
are
no
user
serviceable
parts
inside
the
unit;
leave
all
servicing
to
qualified
service
personnel.
4.
CAUTION:
The
compact
disc
player
uses
Invisible
laser
radiation
and
is
equipped
with
safety
switches
which
prevent
the
emission
of
radiation
when
the
CD
door
Is
open.
It
is
dangerous
to
defeat
the
safety
switches.
5,
CAUTION:
Use
of
controls
for
adjustments
and
the
performance
of
procedures
other
than
those
specified
herein
may
result
in
exposure
to
hazardous
radiation.
6.
CAUTION:
The
laser
is
able
to
function,
if
safety
swit-
ches
are
out
of
function.
The
laser
light
is
invisible,
avoid
.
exposure,
do
not
disassemble
the
laser
unit,
but
replace
SOE
ee
eauna
net,
paler
ara
eataped
the
complete
unit.
apparatet
abnes
og
aflas-
interlock
defeated.
ningsmekanismen
frigores.
\\(o)|9
am
8)
(21-208
Mm
2G
UNDGA
AT
BLIVE
UDSET
POSURE
TO
BEAM.
FOR
LASERBESTRALING.
CLASS 1
LASER
PRODUCT
CD playerfuner section
Obs:
Apparaten innehailer laser-
IMPORTANT
(in
the
United
Kingdom)
komponent
av
hdgre
laserklass
Mains
Supply
(AC
240
V~,
50
Hz
only)
an
klass
1.
DO
NOT
cut
off
the
mains
plug
from
this
equipment.
If
the
plug
fitted
Is
not
sultable
for
the
power
points
In
your
home
or
the
cable
WARNING:
is
too
short
to
reach
a
power
point,
then
obtain
an
appropriate
TO
REDUCE
THE
RISK
OF
FIRE
OR
ELECTRIC
SHOCK,
safety
approved
extension
lead
or
consult
your
dealer.
DO
NOT
EXPOSE
THIS
APPLIANCE
TO
RAIN
OR
BE
SURE
to
replace
the
fuse
only
with
an
identical
approved
type,
MOISTURE.
as
originally
fitted,
and
to
replace
the
fuse
cover.
if
nonetheless
the
mains
plug
Is
cut
off
ensure
to
remove
the
fuse
and
dispose
of
the
plug
Immediately,
to
avoid
a
possible
shock
hazard
by
Inadvertent
connection
to
the
mains
supply.
IMPORTANT
DO
NOT
make
any
connection
to
the
terminal
which
is
marked
with
CAUTION
Jr
/\
00 NOT OFEN
the
ee
E
or
by
the
safely
earth
symbol
or
coloured
green
or
CAUTION:
TO
REDUCE
THE
RISK
OF
ELECTRIC
SHOCK,
green-and-yellow.
DO
NOT
REMOVE
COVER
(OR
BACK].
Ar
NO
USER-SERVICEABLE
PARTS
INSIDE.
The
W006
be
ee
ssains
ead
a
inl
product
are
coloured
In
REFER
SERVICING
TO
QUALIFIED
SEAVICE
PERSONNEL.
accordance
with
the
following
code:
Blue
to
N
(Neutral)
or
Black
The
lightning
flash
with
arrowhead
symbol,
Brown
to
L
(Live)
or
Red
within
an
equilaterat
triengie,
is
intended
to
alert
the
user
to
the
presence
of
uninsulated
“dangerous
voltage”
within
the
product's
As
these
colours
may
not
correspond
with
the
coloured
markings
ancicruré
that
may
be
of
sufficient
magni-
Identifying
the
terminals
in
your
plug
proceed
as
lollows:
tude
to
constitute
#
risk
of
electric
hock
to
The
wire
Which
Is
coloured
blue
must
be
connected
to
the
terminal
persons:
which
Is
marked
with
the
letter
N
or
coloured
black.
The
exclamation
point
within
an
equilateral
The
wire
which
is
coloured
brown
must
be
connected
to
the
triangle
is
intended
to
alert
the
ser
to
the
.
nd
5
terminal
which
is
marked
with
the
letter
L
or
coloured
red.
canes
|
itoring)
eruettons
in
‘the
bere
ture
accompanying
the
appliance.
IF
INDOUBT
-
CONSULT
A
COMPETENT
ELECTRICIAN.
(No. 1890) 3

UX-A4 B/E/G/GI/EN
4
Fuse P.C. board
Power trans
Hi lmportant points for safety management
1. Check “VTP66J2 — 24D ( UX — A4 E/G/GI/EN )", “VTP66T2
— 12D (UX — A4 B )” of power transformer and make sure
that any bolt is not loosened.
2.Check the power source cord indication “ <q VDE [> (ux -
A4E/G/GI/EN)", “SASEC: BS6500(UX — A4B)” of attachment
plug “KP — 419C or SE — 1(UX — A4 E/G/GI/EN )", “KP —
610, 3A or SE — 5, 3A(UX — A4B)” and make sure that the
cord is free from any defect(Damage).
3. M@Concerning the primary terminal and the adjacent
secondary terminal on the print circuit board to provide
proper creeping and spatial distance, solder must not
protrude from soldering round.
@ The tab for winding the power cord must be twisted and
soldered to prevent disconnection.
@ The lead of the power cord must be wound around the
tab and soldered the spatial distance must be 3.2mm or
more.
(No. 1890)
2)
VR801
Mecha.control P.C.board
5
Speaker
terminal
TF 01
Function P.C. board
5. Since the following parts are exothermic, make sure that
such parts will not come into contact with any electrolytic
capacitor, wire and other parts.
ICA05,ICA06,IC502,1C701 ,D952,Q808,QF02,R867,R857 ,
RF38 and heat sink are exothermic parts.
6. Any wire, etc. should be clamped or bonded as indicated in
the above diagram so that such wire will not be positioned
close to any exothermic parts.
7. Wires must be clamped or secured at the locations shown in
the figure so that the wire do not touch to live parts mowing
part, hot part, or sharp edges.
8. By using the special tool , attach the power cord bushing to
the position where “4N — 4” is marked.
9.Set and firmly fix the fuses F951,F952 and F953 respectively
to T400mA, T6.3AandT6.3mA afterconfirmingthe respectively
positions.

3. Features
.
Disc-size
micro
component
system
consisting
of
4
unkts
.
Active
Hyper-Bass
circuit
for
low-frequency
sound
reproduction
Sound
mode
control
(Beat,
Vocal,
Instrument)
One
touch
operation
(COMPU
PLAY)
e
When
a
source
button
(CD,
tape,
or
tuner)
is
pressed,
the
unit's
power
is
turned
on
and
initiates
the
playback
even
when
the
power
is
set
to
STANDBY.
5.
35-key
remote
control
unit
opens
and
closes
the
motor-driven
CD
door,
and
operates
the
usual
CD,
cassette
deck
and
tuner
functions
e
The
remote
contro!
operates
the
power
ON/OFF
switching,
volume
control,
bass/treble
control,
sound
mode
control,
Active
Hyper-Bass
ON/OFF
switching,
and
a
variety
of
editing
functions.
6. Multi-function CD player
¢
Capable
of
auto-edit
recording
and
programmed
play.
a
Be oN
4. Specifications
Compact disc player section
7.
Power supply
UX-A4 B/E/G/GI/EN
U-Turn
auto-reverse
full-logic
mechanism
with
Dolby* B NR
e Auto tape select mechanism.
©
Metal
(type
IV)
and
CrO2
(type
Il)
tape
can
be
played
back
for
superior
tone
quality.
© CrO2 (type Il) tape recording capability
e
Music
scan’
in
forward
or
reverse
direction
.
2-Band
digital
synthesizer
tuner
with
30-station
(15
FM
and
15
AM
(MW/LW))
preset
capability
e
Seek/manual
tuning.
e Aulo preset tuning
Timer/Clock .function
e
Timer
orvoff
with
preset
volume
function.
¢
Wake-up
volume
setting
with
50
different
levels.
©
Sleep
timer
can
be
set
for
up
to
120
minutes.
*
Dolby
noise
reduction
manufactured
under
license
from
Dolby
Laboratories
Licensing
Corporation.
"Dolby"
and
the
double-D
symbol
Ofjare
trade-marks
of
Dolby
Laboratories
Licensing
Corporation.
** Under license of Staar S.A. Brussels, Belgium.
AC 240 V, 50/60 Hz, (UX-A4B)
Type : Compact disc player
Signai detection : Non-contact optical pickup
Number of channels 2 channels
Frequency range 20 Hz — 20,000 Hz
Dynamic range 86 6B
Signal-to-nolse ratio 86 dB
Total harmonic 0.03 %
distortion
Wow & flutter Less than measurable limit
Radio section
Frequency ranges
Antennas
Tape deck section
Track system
Motor
Heads
Frequency response
Wow and flutter
Fast wind time
Speaker section (each unit
Speaker
Dimensions
Weight
General
Power output
Output jacks
FM 87.5 — 108 MHz
AM: (MW) 522 ~ 1,629 kHz
(LW) 144 ~ 288 kHz
Loop antenna for AM (MW/LW)
External antenna terminal for FM
(75 ohms)
4-track 2-channel stereo
Electronic governor OC motor
(capstan x 1, reel x 1)
Hard permalloy head for
recording/playback, 2 gap ferrite
head for erasure
(Combination head)
50 — 15,000 Hz (with meta! tape)
0.09 % (WRMS)
Approx. 120 sec (C-60 cassette)
12 cm x 1 (Woofer)
5 em x 1 (Tweeter)
160(W) x 251(H) x 203(D) mm
Approx. 2.2 kg
Max. 40 W (20 W + 20 W)
at4én
2BW (14W+ 14 Wp al4n
(10 % THD)
Speaker x 2 (matching impedance
42-160)
Headphones (0-30 mW32 0)
(matching impedance 16 2 - 1 kM)
AC 230 V, 50/60 Hz, (UX-A4E/G/GI/EN)
Ext. DC 12 V (car battery via
optional CA-R120E car adapter)
66 W (with POWER SW ON)
4 W (with POWER SW STANDBY)
458.5(W) x 255(H) x 208(D) mm
including knobs
Weight ; : : Approx. 8.9 kg
Accessories provided Remote control unit (RM-RXUA4)
x1
Battery "RG" x 2 (for the remote
contro!)
FM feeder antenna x 1
Loop antenna stand x 1
Speaker cord x 2
Antenna adapter x 1
Power consumption
Dimensions
Design and specifications are subject to change without notice.
(No. 1890)
5

UX-A4 B/E/G/GI/EN
5. Instructions (Extract)
NAMES
OF
PARTS
AND
THEIR
FUNCTIONS
CD player/General section
6 (No. 1890)
@ SOUND button
@ ACTIVE HYPER-BASS button
on: The ACTIVE HYPER-BASS indicator will light. Set
to this position to listen to the ACTIVE HYPER-
BASS sound.
off: The ACTIVE HYPER-BASS indicator goes out. Set
to this position when ACTIVE HYPER-BASS sound
is not required.
© Active Hyper-Bass indicator
@ CD door
© Sound mode indicators (BEAT/VOCAUINSTR,)
@ Power STANDBY indicator
@ REMOTE SENSOR section
@ POWER button
Press to switch the power on or off.
© CD door OPEN/CLOSE button (4)
@ TREBLE buttons (+,-)
{control range from ~6 to 6)
@ BASS buttons (+,—)
(control range from ~6 to 6)
@ VOLUME buttons
+: Use to increase the volume
-: Use to decrease the volume
(control range from VOL 0 to VOL 50)
@ Display window
Function/Track number display
Playback time display
EDIT recording mode indicator
SIDE (A)/(B) indicator
Music calendar display
Repeat playback indicator
INTRO scan indicator
RANDOM playback indicator
PROGRAM mode indicator
OVER indicator
@ CD SEARCH buttons (eq , bP):
Press
to
locate
the
beginnings
of
tunes
ancl
to
start
forward and reverse search operations.
@ Stop/CLEAR button (m):
Press
to
stop
playing
a
disc
and
to
cance!
pngrammed
playback. This also sets the CD mode.
@ Play/pause button (>): .
Press to play a disc and to stop temporarily.
BOCSVOOOLOO

UX-A4 B/E/G/GI/EN
Tuner/Deck section
@ FM MODE button
@ TUNER/BAND bution
Press to select the tuner mode.
Press to select the band (FM/AM (MW/LW)).
© Display window
Band Indicator (FM/AM (MW/LW))
Radio frequency display
G) MONO indicator
@ STEREO indicator
(5) Preset stalion display
(6) Reverse mode indicator ( = / 32> /C2>)
() Tape mode display
(8) Tape direction indicator (~<, >)
(3) Recording indicator (REC)
(0) DOLBY NR indicator (DOLBY NR)
@ Tuning button (UP/DOWN)
© Cassatte holder
@
Headphones
jack
(PHONES)
(3.5
mm
dia,
stereo
mini)
Connect headphones (impedance 162 - 1kS2) to this
jack. The speakers are automatically switched off when
the headphones are connected.
@ REVERSE MODE switch
= : For single-side recording or playback
=~: For both-sides recording or playback
C=): For continuous play
© DOLBY NRA button
Set to ON when recording or playing back tapes using
the noise reduction system.
© Cassette operation buttons
: Press to fast wind the tape from right to
lef/Music scan.
: Press to play back the tape In the
reverse direction.
: Press to stop the tape.
This also sets the TAPE mode.
: Press to play back the tape In the forward
direction.
: Press to fast wind the tape from left to
right/Music scan.
@/31REC : Press to set the unit to the record or
record-pause mode.
CD SYNCHRO REC : Press to start CD edit recording/
synchro recording.
@ EJECT button
yon es
(No. 1890) 7

UX-A4 B/E/G/GI/EN
8
Clock/Timer section
@ Display window
Timer mode indicator
SLEEP indicator
Timer indicator (ON/OFF)
@® Time display
@ UP/DOWN bultons
Set the time or timer setting.
© CLOCK button
Set the time and current time displays.
@ TIMER button
Set the timer setting or timer ON/OFF (to reset or
cancel the timer).
@ ENTER bution
Register the time or timer seiting.
( REMOTE CONTROL UNIT
Preparation before use
3. Replace the cover,
@ Installing batteries In the remote control unit
1. Remove the battery cover from the back of the remote e Battery replacement
control unit, When the remote control operation becomes unstable
2. Insert two °R6" size batteries. or the distance from which remote control is possible
@ insert the batteries with the @® and © terminals becomes shorter, replace the batteries with new ones.
matching the indication inside the battery
compartment.
S Insert theO ends first.
S A
c> WZ a HF
Y
Using the remote control unit
To use the remote control unit, point it at the REMOTE
SENSOR and press the buttons gently and firmly. Remote
control operation is possible within about 7 m (approx. 23
ft). However, since the remote control range Is less when
the unit is used at an angle, use directly in front of the
REMOTE SENSOR, as far much possible.
Do not expose the REMOTE SENSOR to strong light (direct
sunlight or artificial lighting) and make sure that there are
no obstacles between the REMOTE SENSOR and the
semote control unit.
(No. 1890)

UX-A4 B/E/G/GI/EN
The following operations can be performed using the
remote contro! unit.
@ Check the functlons of the operation buttons
carefully and operate them correctly.
eS snono re
3
BASS = 4
EE
JVC
REMOTE CONTROL Fim-. “BXUAG
@
Track
(tune)
number
buttons
(No.1
—
No.10,
+10)
Press
the
following
buttons
while
holding
down
the
SHIFT
@
TUNERBAND
button
button
@.
@ AUTO PRESET button @ CLOCK button
@
ACTIVE
HYPER-BASS
button
Use
to
display
a
current
time.
@ SOUND button @® INTRO button
@ SHIFT button @ RANDOM button
@ POWER button @ PROGRAM button
@ SLEEP bution @ EDIT button
©
CD
DOOR
button
(
4)
@
MODE(STEREO
AUTO/MONO)
button
@
CD
»/1:
CD
mode/play/pause
button
@ SYNCHRO
REC button
@ wm/CLEAR:stop/clear button @ REPEAT button
@ CD SEARCH/DOWN and UP button (Ht, Bot) @® SIDE AB button
© in the CD mode, to scan to the beginning of a tune
and to start forward or reverse search.
@ In the tuner mode, to tune to broadcasts.
@® Cassette operation buttons
~< Play button (reverse direction of tape)
| : Stop button
> : Play button (forward direction of tape)
o/11 : Fecord/Record-pause button
ahd : Fast wind (from right to left)/Music scan
button
>> : Fast wind (from left to right}/Music scan
button
@ VOLUME buttons (+.-)
@® TREBLE buttons (+,-)
@ BASS buttons (+, -)
(No. 1890) 9

UX-A4 B/E/G/GI/EN
(Switcr nie eoeR OwOFE
POWER bution
TUNER/BAND button °
<1, > buttons
= TREBLE + ~ wee + =
Ee is 5 (=)
Play/pause button
Switching the power on/off Fah 5
®
Switching
on:
©
Switching
off:
\I- The indicator lights.
= The indicator goes out. rs
STANDBY
STANDGY
© The indicator in the display window lights. ° Ey Indicator in the display window goes out and only the clock is
indicated.
COMPU PLAY
Even
when
the
power
is
set
to
STANDBY,
pressing
the
button shown below switches on the power and selects the
source.
Function mode Operations
When
this
button
Is
pressed
with
a
CD
loaded,
CD
playback
begiris.
-
[x]
or
[>
)
TAPE
When
this
button
Is
pressed
with
a
tape
loaded,
tape
playbackbegins.
Teer
TUNER
When
this
button
Is
pressed,
the
tuner
is
engaged
When the CD door OPEN/CLOSE button (4) Is pressed,
the source sound does not switched over, the CD door can
open or close.
Notes:
1. When switching off the power, be sure to press the
power button.
2. The COMPU PLAY button on the remote control has the
same function as the UX-A4.
3. When the CD door opens and the Play/pause ({ > #3)
button is pressed, the CD door closes and the CD play
starts.
10 (No. 1890)