Pioneer SX-4 Service manual
c)ProNEEr{
COMPUTER
CONTROLLED
STEREO RECEIVER
s)(-
MODEL
r
o
r Ce manuel d'instuction
o Este manual
SX.4 COMES IN FOUR VERSIONS DISTINGUISHED AS
Type
KU AC 12OV only
Voltag€ Remarks
s AC 110V, 120V,220V and 24OV
KC AC 12OV only
YP
This service manual is
For
the circuit
AC 240V only
description,
applicable to the KU
please
se refdre
de servicio trata
del m6todo
(Switchable)
type.
refer
to the model SX-7
au mode
de r6glage, en frangais.
de ajuste escrito en espafrol.
FOLLOWS:
U.S.A. model
General export model
model
Canada
Australia model
service
manual
{ARP-047-0).
ORDER
NO.
ARP-O15-O
CONTENTS
1.
SPECIFICATIONS
F
2.
3.
PARTS
4. PACKING
BLOCK DIAGRAI\4
o.
P.C.BOARDS
PIoNEEFIELECTFICINICCG,F|PCTF|AI|CTN
(,.a.
FE N--ll aLaCtFCtNlce CC,FIPC'AATIC'N 85 Oxro.ct O.'ve.
PE illla tl.-CtFCtNlC IEUFC'PE, N.V. Lu'.haAe.-Haven 9.2O3o
FlCrialCF lLaCTElC'NlCa
PANE L FACILITIES
RONT
LOCATION
CONNECTION DIAGRAM
AUaIFIALIA F Y. LYo.
1 7E' I
A4 Aolnda.y
2
4
6
I
I
Moona.h'e,
Rodd,
SCHEMATIC
ELECTR ICAL PABTS
8.
EXPLODED
9.
10.
ADJUSTMENTS
VIEW
nEcuce
AJUSTE
r-chome.M6su.o-ku.r
Je.sey
New
B.aes'de
O2O74.
DIAGRAM
LIST .
u s a
FHOTULY
1981
Printed
in
13
17
21
23
za
27
japan
1.
SPECIFICATIONS
Amplifier
Continuous Average Power
watts*
20 Hertz
than
Total Harmonic
ohms, from
8
continuous
10
f ntermodulation
continuous rated
Damping
put
I n
PHONO
AUX/VIDEO
Phono
PHONO
Output
TAPE REC
Frequency
PHONO
AUX/VIDEO.
Section
per
channel, min., at
to 20,000 Hertz with
0.04%
watts
Factor
(Sensitivity/l
Overload
(
Level/l mpedance)
total
Distortion
AUX/VIDEO)
power
rated
per
channel
Distortion
power
Hertz
l2O
mpedance)
TAPE
Level
Response
(R
IAA Equalization)
TAPE
0utput
8 ohms
no more
harmonic distortion.
(20
Hertz
to
20,000 Hertz,
output
power
output
(50
8 ohms,
output
to
20,000 Hertz,
PLAY
(T.H.D.
O.1"/o,
. . . . 30Hzto 15.000H2t0.5d8
PLAY
"
"
No
. .
. .
Hertz:
. .
....2.5mYlb0kitohms
10H2 to
more
No
more
7,000
Hertz
from
AUX/VIDEO)
No more
ohms)
8
150mV/50
1,000H2)
.15OmVl2.2 kitohms
50'000H21!
ronr'coniro;
BASS.
TREBLE
'"':::'::::::':lY:
*::':l:':
::'
Hum
and Noise
PHONO
AUX/VIDEO,TAPEPLAY.
FM Tuner
Usable
Sensitivity .
50dB Ouieting
Signal-to-Noise Ratio Mono; 75dB
(lHF,
Section
Mono; 11..2d8f
Sensitivity
short
circuited A network)
Mono;
16.3dBf
Stereo; 37.2dBI
...t8dB(100H2)
. .18d8
::
i?::Jil$Tl,
(lHF) (1.OpV,75
(1
.8pV,
(19.9pV,
Stereo;70d8
is
20
from
than 0.04%
than 0.04%
=
4 : 1,
than
0.04%
50
kitohms
130mV
uoe
(tOkHz)
70dB
....96d8
ohms)
75 ohms)
75 ohms)
(at
85dBf
(at
)
85dBf)
Distortion
Mono.
Stereo
CaptureRatio.
Alternate Channel
StereoSeparation
Frequency
SpuriousResponseRatio.
lmageResponseRatio
lFResponseRatio,
AM
SubcarrierProductRatio.
SCA
Muting Threshold
Antenna
AM Tuner
Sensitivity
lHF,
lHF,
Selectivity
Signal-to-Noise
lmageResponseRatio
lFResponseRatio.
Antenna
(at
65dBf)
Selectivity 400kHz;
Response
Suppression Ratio
Rejection
Input
ratio
300 ohms
. .
Section
ferrite
antenna
external
antenna
Ratio
20Hz
balanced, 75
Built-in
Miscellaneous
Power
Requirements
Power
Consumption
Dimensions
16-9/16(W)
Weight
Furnished
FM
DryBatterysuM-3"AA"
Operatinglnstructions
NOTE:
Specifications
notice.
(without
T-type Antenna
*Measured
Regulation rule
Parts
pursuant
on Power
and
package)
to the
design
federal
Output
subiect
420(W)
.
.
Claims
to
...100H2;0.15%
....100H2;0.3%
....1kH2;40d8
30Hz to
to 15kHz
29.3dBf
ohms unbalanced
ferrite
loopstick
AC 120V.60Hz
. . .200W
x
98(H) x 311(D) mm
x 3-718(H) x
5.2 kg
Trade
Commission's Trade
for
Amplif ier.
possibte
modification
1 kHz; 0.1 5%
6kHz;O.2%
l kHz; 0.3%
6kHz; O.4o/o
....1.0d8
60dB
'l5kHz;
+0.5d8,
......65d8
......40d8
......73d8
35dB
-1dB
...65d8
..90d8
55dB
.
...40d8
. . 60dB
(8pV)
300pV/m
. .
15gV
.27d8
50dB
.
antenna
(UL)
12-114(Dl
(1
1 lb 7 ozl
....2
,......1
without
in
1
SETTING USE
SWITCH
Before the receiver leaves
switch is set
tion.
switch
Set
plan
casting stations change from 1OkHz
NOTE:
Contact
han nel al I
c
(on
For
the
is
set
it to the
is changed
your
otment
THE AM
the rear
channel
to the
U.S.A., it is
properly
before use.
position
9kHz
and the intervals
dealer
and
pla
n.
CHANNEL
panel)
the manufacturing
allotment
set
to
when the channel
inquire if
you
STEP
plant,
olan of the destina-
1OkHz. Check
allotment
between the
to
9kHz
are not sure about
AM
units.
this
that the
broad-
the
niT-trn
".r.J
10kHz
L'orr.
position
LOADING
Two size
They are
THE BATTERIES
"AA" dry batteries are
used to retain the
functions.
Before using the
the batteries
unit, disconnect the
into
the compartment
follows:
1. Slide the
compartment
Load
2.
with the marks
lid
in the direction
(see
Fig.
the batteries
on the
Fis.2).
Align
3.
the tab of the lid with
depress the lid lightly.
Battery Precautions:
lf batteries
break open
precautions
1. Always
shown above
2.
Do
the same time.
Do
3.
same
are incorrectly
inside
when inserting
sure the
be
and
not
not
new
use
use different
time.
the battery holder. Observe
as
batteries
provided
station
presetting
power
on the rear
of the arrow
1).
with
polarities
the
inside
of the compartment
the interlocking hole
properly
used. they may
replacing
and
+
and - ends are aligned
marked
on the battery holder.
and
brands and types
the batteries.
partly
used batteries at
of
accessories.
as
memory
cord and load
panel
and open the
aligned
(see
and
leak or even
following
the
properly
batteries
at the
as
as
Insert
tab
interlocking
Fis.
4.
There
rechargeable dry cell batteries.
the
When
5.
of batteries
with
mium type
are rechargeable dry
battery to be sure which kind
replacing the
(carbon
receiver.
the
batteries, always
zinc)
Do
not use
batteires.
into
hole
3
cell batteries and
Always
as the ones originally
read
you
have.
use the
alkaline and
the
same type
nickel
Fig.2
Fis.4
non-
notes
on
provided
cad-
2.
FRONT PANEL
FACILITIES
powen
o
Power
("in"
FM
@
This lights when receiving
TU INDICATOR
@
This
lights when receiving the
when depressed the
nru rNDrcAToR
@
This lights when receiving the AM broadcasts.
FREOUENcY
@
This
scale is composed
During frequency
to right
ponding
pressed.
rurueo rNDrcAToR
@
lights when the optimum tuning
This
located
searched.
swlrcH
is
supplied to the unit when this
position).
STEREo
or vice versa,
to
during reception.
INDIcAToR
FM
switch).
scALE
of 16light-emitting
scanning,
depending
the TUNING
FM
an
stereo
FM
the lighting
SWITCH which
lt blinks when stations
switch
program.
broadcasts.
diodes
moves from left
on the direction
point
is depressed
(This
lights
(LEDs).
corres-
has been de-
has been
being
are
TUNING
@
This
is used
pressed,
leftward
tion
which has
The
When a
TUNED
The sound from
onds. After
onds,
this
succession.
NOTE:
The sound
press
you
@
Depress this
@
Depress
the LEDs
or
corresponding
been depressed.
TUNED indicator
station is located.
indicator
that sound has
frequency
the
way,
all the broadcasting
of
the TUNING
want
to search
FM
swrrcH
nm swtrcH
this switch
switch
tune
to
on
rightward
to the
lights
the
station
scanning
each station
switch
the next station
for
switch
for
in broadcasting stations.
frequency
the
direction, depending
part
and
now
starts to blink.
the LEDs
up.
can be heard in
been heard
is heard for
if this is not
FM
reception.
AM
reception.
scale light up in the
on the direc-
of the TUNING
frequency
operation
stations are
promptly.
scanning starts.
stop moving
about
for
these few
starts again.
picked
about 5 seconds but
the required
station or if
When de-
switch
and the
5 sec-
sec-
In
up in
de-
PARTS
3.
LOCATION
Front Panel
Display cover
ANR454
Top cover
ANE.362
panel
Front
ANM075
(POWER
Knob
AAD.406
(BASS,TREBLE,BALANCE)
Knob
AAB.274
View
assembly
-
------------5
)
NO?'Sr
o
The
6ofet!
!
factor
marh
found
of the
on some component
part.
Therefore, when rcplscing, be
patts
designation,
o
your
For
marhs
Parts Stoch Contrcl, the
qnd
**
** GENERALLY
*
MOVES FASTER THAN
faet
mouing
Thia clossification eholl be odiusted b! each dietibutor
number, te mp
eroture, humidity, e tc.
indicates the importance of the
sure to u8e
ports
of identical
items ore indicdted uith the
,
because it depend, on model
Knob
{TUNING)
AAD.4OO
Knob
AAD4O2
Knob
AAD403
(VOLUME)
Knob
AAB.273
(INPUT)
Knob
AAD.399
(TAPE/ADPT.
Knob
LOUDNESSI
AAD-405
MONO,
(FMl
(AMl
Front
View with Panel
AEL.379
jack
Phones
AKN-029
r
A
Variable resistor
ACT-140
Variable
ACT-140
{PHONES}
Push
*
ASG-521
resistor
Variable resistor
ACT-o23
switch
(POWER
(
(TREBLE)
Removed
Knob
AAD4O4
Variable
ACT-128
3{anged
I *
(TAPE/ADPT.
LOUDNESS}
ASG'301
(MEMORY/STOP)
(VOLUMEI
resistor
push
switch
MONO,
Tact switch
*t
ASG-177
Control assembly
GWX-721
4. PACKING
No. Part
1. AHA-294
2. ARB439
3. ADHOo4
4. AHD-961
Rear Panel
Slide switch
* t
ASH-O15
rerminal
AKB{76
(AM
No. De.cription
View
(AM
CHANNEL
STEREO OUTI
pad
Side
Operating instructions
T-type FM €ntenna
Packing
case
STEPI
AC socker
,\
AKP-039
s*613
(AC
OUTLETSI
Strain reliet
AEC-358
Terminel
AKB-079
Terminal
AKB{77
(PHONO,
(PLAYI
Top View
AUX/VtDEO,R
ECI
AC
ADG.O52
Terminal
AKE.lOI
**
ti\
Power
ATT€39
*r
.'!
power
cord
{SPEAKERS)
(5A)
Fuse
AEK-1OA
transform€r
(3Al
Fuse
AEKI
Ol
BLOCK DIAGRAM
5.
FMF
GNO
300n
!
FM FRONT
+35.6d8
END
ATlkHr
l,-o.0.
osc
I
351
FM
bl
AMP
IF
A DETECTOR
IF
TUNING
OETECTOR
PLL
SYNTHESIZER CIRCUIT
AUP
A OETECTOR IC
'I
oerecro a
SIGNAL
IIETER
Io"
IC M54922P
r
I llt
--"
I
^M/FM
PO
FM,/Ail
oarr I a
rN
G) LD
sELEcroR
FM
MPX STEREO DEMODULATOR
MPx
STEREo
DECODER
IC
t^
l"
I'
8CD
va vs
TO
OECIMAL
vo Yt Y2 Y3 vi
L.P,F / AF A}AP
OECOROER
L-ouT
FREQUENCY DISPLAY
X'TAL
3 E.
P06004
IC
Voo
R7
R8
R9
RESET
Rto
Rtl
KO
KI
X2
K3
.'
IRQ
PO
Oo
or
vurE
--
AUX
,/
Vt0€O
FUNCTION
r*}@*
g€ oFF
sw
POWER
SELECTOR
fcl
q
-o
fv
MoNo
R,
CH
LOU0f{ES
sw
SUPPLY CIRCUIT
rUNER
SECTION
AMP
EQ
FU NCTION
S€ LE CTOR
MoD€
S
oFF
MUTING
CONTROL
POWER
AMPLIFIER
SPEAKERS
^
sw
oN
IONE
CONTROL
-r
-+&
ll -j-vn
#
I
v-
R.CH
POWER
SW
-1#orr
f Fr tql'
jf
lj
r
pxorts
I
_=r"f
',
--{1
I
I
I
j
AC 12OV
60Hr
-
a
E
1
I
l2
I
3
A
B
6.P
.C.BOARDS
CONTROL
CONNECTION
Ass'y(GwX-72
Q2
DIAGRAM
|
)
C
D
VOLUME
AssV
CONTROL Ass'y A
4
5
6
COMPLEX
Ass'y
CONTROL
(awx-7,7)
Ass'y
TC202
Qro5
o2o4
Q2r3
Q2O5
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