Pioneer SX-4 User manual

c)ProNEEr{
2
4
6
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I
8.
9.
10.
ORDER
NO.
ARP-O15-O
COMPUTER
CONTROLLED
STEREORECEIVER
s)(-
MODEL
SX.4COMESINFOURVERSIONSDISTINGUISHEDASFOLLOWS:
r Thisservicemanualis
applicableto theKU
type.
o Forthecircuitdescription,
please
refer
to the modelSX-7
service
manual
{ARP-047-0).
r Cemanueld'instuction serefdre
aumode
der6glage,enfrangais.
o Estemanual
deserviciotratadelm6todo
deajusteescritoenespafrol.
1.
2.
3.
o.
13
17
21
23
za
27
CONTENTS
SPECIFICATIONS
F
RONT
PANE
L FACILITIES
PARTS
LOCATION
4. PACKING
BLOCKDIAGRAI\4
P.C.BOARDS
CONNECTIONDIAGRAM
PIoNEEFIELECTFICINICCG,F|PCTF|AI|CTN r-chome.M6su.o-ku.r
(,.a. FE N--ll aLaCtFCtNlce CC,FIPC'AATIC'N 85 Oxro.ct O.'ve. Moona.h'e, New Je.sey O2O74. u s a
PE illla tl.-CtFCtNlC IEUFC'PE, N.V. Lu'.haAe.-Haven 9.2O3o
FlCrialCF lLaCTElC'NlCa AUaIFIALIA F Y. LYo. 1 7E' I A4 Aolnda.y Rodd, B.aes'de
FHOTULY 1981
Printed
in
japan
SCHEMATIC
DIAGRAM
ELECTRICALPABTS
LIST.
EXPLODED
VIEW
ADJUSTMENTS
nEcuce
AJUSTE
Type Voltag€ Remarks
KU AC12OVonly U.S.A.model
sAC110V,120V,220Vand24OV
(Switchable) Generalexport model
KC AC12OVonly Canadamodel
YP AC240Vonly Australiamodel

1. SPECIFICATIONS
Amplifier
Section
ContinuousAveragePower
0utput
is 20
watts*
per
channel,min.,at 8 ohms
from
20 Hertz
to 20,000Hertzwith
no more
than
0.04%
total
harmonicdistortion.
TotalHarmonic
Distortion
(20
Hertz
to 20,000Hertz,
8
ohms,from
AUX/VIDEO)
continuous
rated
power
output . . No
more
than0.04%
10
watts
per
channel
power
output
. . No more
than0.04%
fntermodulation
Distortion
(50
Hertz:
7,000
Hertz
=
4 : 1,
8ohms,
from
AUX/VIDEO)
continuousrated
power
output. . Nomore
than
0.04%
Damping
Factor
l2O
Hertz
to 20,000Hertz,
8 ohms) 50
In
put
(Sensitivity/l
mpedance)
PHONO ....2.5mYlb0kitohms
AUX/VIDEO
TAPE
PLAY 150mV/50
kitohms
Phono
Overload
Level
(T.H.D.
O.1"/o,
1,000H2)
PHONO 130mV
Output
(
Level/lmpedance)
TAPEREC .15OmVl2.2kitohms
Frequency
Response
PHONO
(R
IAAEqualization)
. . . . 30Hzto 15.000H2t0.5d8
AUX/VIDEO.
TAPE
PLAY
ronr'coniro; " " 10H2to
50'000H21!
uoe
BASS. ...t8dB(100H2)
TREBLE . .18d8 (tOkHz)
'"':::'::::::':lY:
::'
*::':l:':
::
i?::Jil$Tl,
Hum
andNoise
(lHF,
short
circuitedA network)
PHONO 70dB
AUX/VIDEO,TAPEPLAY. ....96d8
FMTuner
Section
Usable
Sensitivity.
Mono;11..2d8f
(lHF)(1.OpV,75
ohms)
50dBOuieting
Sensitivity
Mono;
16.3dBf
(1
.8pV,
75ohms)
Stereo;37.2dBI
(19.9pV,
75ohms)
Signal-to-NoiseRatio Mono;75dB
(at
85dBf
)
Stereo;70d8
(at
85dBf)
Distortion
(at
65dBf)
Mono. ...100H2;0.15%
1kHz;0.15%
6kHz;O.2%
Stereo ....100H2;0.3%
lkHz;0.3%
6kHz;O.4o/o
CaptureRatio. ....1.0d8
AlternateChannel
Selectivity 400kHz;
60dB
StereoSeparation ....1kH2;40d8
30Hzto 'l5kHz;
35dB
Frequency
Response 20Hz
to 15kHz
+0.5d8,
-1dB
SpuriousResponseRatio. ...65d8
lmageResponseRatio ......65d8
lFResponseRatio, ..90d8
AMSuppressionRatio .
55dB
SubcarrierProductRatio. ...40d8
SCA
Rejection
ratio . .60dB
MutingThreshold 29.3dBf
(8pV)
Antenna
Input. . 300ohms
balanced,75
ohmsunbalanced
AM Tuner
Section
Sensitivity
lHF,
ferrite
antenna . . 300pV/m
lHF,
external
antenna 15gV
Selectivity .27d8
Signal-to-Noise
Ratio .50dB
lmageResponseRatio ......40d8
lFResponseRatio. ......73d8
Antenna Built-in
ferrite
loopstick
antenna
Miscellaneous
Power
Requirements AC120V.60Hz
Power
Consumption . . .200W
(UL)
Dimensions . 420(W)
x 98(H) x 311(D)mm
16-9/16(W)
x 3-718(H)x 12-114(Dl in
Weight
(without
package) 5.2kg (1
1lb7 ozl
Furnished Parts
FM
T-typeAntenna 1
DryBatterysuM-3"AA"
. ....2
Operatinglnstructions ,......1
*Measured pursuant to the federal Trade Commission's Trade
Regulation rule on Power Output Claims for Amplif ier.
NOTE:
Specifications and design subiect to possibtemodification without
notice.

SETTINGUSE
THE AM CHANNEL
STEP
SWITCH
(on
therear
panel)
Before the receiverleaves
the manufacturing
plant, this
switch is set to the channel
allotment
olan of the destina-
tion. For the U.S.A., it is set to 1OkHz.Check that the
switch
is
set
properly
beforeuse.
Set it to the 9kHz position when the channelallotment
plan is changed and the intervals between the AM broad-
castingstationschangefrom 1OkHz
to 9kHz units.
NOTE:
Contact your dealer and inquire if you are not sure about the
c
hannelalI
otment pla n.
LOADING
THEBATTERIES
Two size
"AA" dry batteriesareprovided
as
accessories.
They are usedto retainthe stationpresetting
memory
functions.
Beforeusingthe
unit,disconnectthe
power
cordandload
the batteries
into the compartment
on the rear
panel
as
follows:
1.Slidethe
lid inthedirection
of thearrow
andopenthe
compartment
(see
Fig.
1).
Load the batteries with the polarities
properly aligned
with the marks on the inside
of the compartment (see
Fis.2).
Align the tab of the lid with the interlockinghole and
depressthe lid lightly.
BatteryPrecautions:
lf batteries
areincorrectly
used.theymayleakor even
break open inside the battery holder. Observe
the following
precautions
when inserting
and
replacing
the batteries.
1. Always be surethe + and - endsarealigned
properly
as
shownabove
and
as
marked
on the batteryholder.
2. Do not use new batteries and partly used batteriesat
the same time.
3. Do not usedifferent brandsand types of batteries at the
same
time.
niT-trn
".r.J L'orr.
10kHz
position
Fig.2
Insert
tab into
interlocking
hole
Fis.
3Fis.4
There are rechargeabledry cell batteriesand non-
rechargeabledry cellbatteries.
Always
read
the
notes
on
thebatteryto besurewhichkind
youhave.
When
replacingthe batteries,always usethesametype
of batteries
(carbon
zinc)
astheonesoriginally
provided
with the receiver.
Do not use
alkalineand
nickel
cad-
miumtype
batteires.
2.
3.
4.
5.

2. FRONTPANELFACILITIES
o powen
swlrcH
Power
is
suppliedto theunit whenthis
switch
isdepressed
("in" position).
@ FM
STEREo
INDIcAToR
This lightswhen receiving
an FM stereo
program.
@ TU INDICATOR
This
lightswhenreceivingthe FM broadcasts.
(This
lights
whendepressedthe
FMswitch).
@ nrurNDrcAToR
ThislightswhenreceivingtheAM broadcasts.
@ FREOUENcY
scALE
This
scaleiscomposed
of 16light-emitting
diodes
(LEDs).
Duringfrequency
scanning,
the lighting
movesfrom left
to right or viceversa,
depending
on thedirection
corres-
ponding
to the TUNING SWITCHwhichhasbeende-
pressed.
@
rurueorNDrcAToR
This lights when the optimum tuning point hasbeen
located
duringreception.
lt blinkswhenstations
are
being
searched.
@ TUNING
switch
This is used
to tune in broadcastingstations.
Whende-
pressed,
the LEDs
on the frequency
scalelightup in the
leftward
or rightward direction,depending
on thedirec-
tion corresponding
to the part of theTUNING
switch
whichhas
beendepressed.
and
frequency
scanningstarts.
The
TUNEDindicator
now
startsto blink.
Whena stationislocated.
the LEDs
stopmoving
andthe
TUNED
indicator
lights
up.
The soundfrom thestation
canbeheardin about
5 sec-
onds.After thatsoundhas
beenheard
for thesefew sec-
onds,
the frequency
scanning
operation
startsagain.
In
this way, all the broadcasting
stationsarepicked
up in
succession.
NOTE:
The sound of each station is heard for about 5 seconds but de-
press the TUNING switch if this is not the required station or if
you want to search the next station promptly.
@ FM
swrrcH
Depressthis
switch
for FMreception.
@nmswtrcH
Depress
thisswitch
for AM reception.

3. PARTSLOCATION
FrontPanel
View
Display cover
ANR454
Topcover
ANE.362
Front
panel
assembly
-
ANM075
Knob (POWER
)------------5
AAD.406
Knob
(BASS,TREBLE,BALANCE)
AAB.274
Front
ViewwithPanel
Removed
AEL.379
NO?'Sr
o The ! marh found on some componentpatts indicatesthe importance of the
6ofet! factor of the
part. Therefore,whenrcplscing,be
sureto u8e
ports
of identical
designation,
o For your Parts Stoch Contrcl, the faet mouing items ore indicdted uith the
marhs ** qnd *
** GENERALLY MOVES FASTER THAN ,
Thiaclossificationehollbeodiustedb! eachdietibutor becauseit depend,on model
number,temp
eroture,humidity, etc.
Knob
{TUNING)
AAD.4OO
Knob
(FMl
AAD4O2
Knob
(AMl
AAD403
Knob
(VOLUME)
AAB.273
Knob
(INPUT)
AAD.399
A r * Push
switch(POWER
ASG-521
Knob
(TAPE/ADPT.
MONO,
LOUDNESSI
AAD-405
Knob
(MEMORY/STOP)
AAD4O4
Variable
resistor
(VOLUMEI
ACT-128
I * 3{angedpush
switch
(TAPE/ADPT.
MONO,
LOUDNESS}
ASG'301
*t Tactswitch
ASG-177
Controlassembly
GWX-721
Phones
jack {PHONES}
AKN-029
Variableresistor
(
ACT-140
Variable
resistor
(TREBLE)
ACT-140
Variable resistor
ACT-o23

4. PACKING
No. Part No. De.cription
1. AHA-294
2. ARB439
3. ADHOo4
4. AHD-961
Side
pad
Operatinginstructions
T-typeFM€ntenna
Packing
case s*613
RearPanel
View
* t Slideswitch
(AM
CHANNEL
STEPI
ASH-O15
rerminal
(AM
STEREOOUTI
AKB{76
Terminel
(PHONO,
AUX/VtDEO,R
ECI
AKB-079
Terminal
(PLAYI
AKB{77
TopView
,\ ACsocker
(AC
OUTLETSI
AKP-039
Strainreliet
AEC-358
ACpower cord
ADG.O52
Terminal
{SPEAKERS)
AKE.lOI
ti\ ** Fuse
(5A)
AEK-1OA
Power
transform€r
ATT€39
.'! *r Fuse
(3Al
AEKI
Ol

5. BLOCKDIAGRAM
FM FRONT END FM IF AMP A DETECTOR FM MPX STEREODEMODULATOR
MPx STEREo L.P,F/ AF A}AP
DECODER
IC L-ouT
300n
FMF
GNO !
IF AUP
A OETECTORIC
'I
oerecroa
SIGNAL
IIETER
Io"
TUNING OETECTOR
3 E. X'TAL
IC P06004
R7 Voo
R8
R9
Rto RESET
Rtl
KO
KI
X2
K3
.' IRQ
PO
Oo
or vurE
l,-o.0.
I osc 351
bl
PLL SYNTHESIZERCIRCUIT
r IC M54922P t^
Illt oarr Ia
I
--" rN
l"
^M/FM I'
PO G) LD
+35.6d8 ATlkHr
8CD
TO
OECIMAL
OECOROER
FM,/Ail sELEcroR
va vs vo Yt Y2 Y3 vi
rUNER
SECTION
EQ AMP
FUNCTION
S€LECTOR
I
POWER
SW I
-1#orr I
f Fr tql'
lj jf
FREQUENCYDISPLAY
POWER
AMPLIFIER
IONE
CONTROL
POWER SUPPLY CIRCUIT
AUX
,/
Vt0€O
MUTING
CONTROL
--
-
FUNCTION
SELECTOR
r*}@*
g€ oFF fcl
sw q MoD€ sw
^ SPEAKERS
r
f- -o
v MoNo oN
R,
CH -r I pxorts
-+& _=r"f
ll -j-vn
#
I ', --{1
v-
LOU0f{ES
S
sw oFF
j
R.CH
AC12OV
60Hr
a

E6.P 1
.C.BOARDS I
l2
CONNECTION I
DIAGRAM 3
A
B
CONTROL Ass'y(GwX-72 | )
Q2
VOLUME AssV
C
CONTROL Ass'y A
D

6
5
4
COMPLEX Ass'y
CONTROL Ass'y
(awx-7,7)
TC202
Qro5 o2o4 Q2r3
Q2O5

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