Pioneer SX-202 User manual

(v)
rrtoNeerl
3
4
5
6
8
9
ORDER
NO.
ARP-230-O
sx-?;0e-
MODEL
SX.2O2
(SX.2O2LI
COMES
IN SIXVERSIONS
DISTINGUISI.IED
AS FOLLOWS:
additional
service
manual.
o Cemanueld'instruction
serefdre
aumode der6glage,
enfrangais.
. Este
manualdeservicio
tratadelm6tododeaiusteescritoenespaiiol.
CONTENTS
't. sPEctFtcATtoNs
.
....
2. FRONT
PANEL
FACILITIES
3. PABTS
LOCATTON
. . . . . . .
4. BLOCKDIAGRAM
5. CIRCUIT
DESCRIPTIONS
6. PACKING
7. EXPLODED
VIEW
AND
PARTS
LIST
...
8. P.C. BOARDS
CONNECTIONDIAGRAM
9. SCHEMATICDIAGRAM
10. ELECTRICALPARTS
LIST
I1. DIAL CORD
STRINGING
12. ADJUSTMENTS
,. ,.
REGLAGE
AJUSTE.
12
t5
17
19
20
FICINEEFI ELECTFICINIC GCIFIPCIFIATION a I, Mesuno 1 Ljhome, Mesu.o-ku, Tokyo 1::3, Jspen
PICINEEFI ELEC:THONICB IUBAI lNC. 1925 E. oomnguez SE., Long Beach, Cahfo.nra go8lO u.S.A..
PIGINEEFI ELEC?FIC,NlC [EUnclPEI N.V. Keerbenglssn 1, 2740 Beve.en, Eletg,um
PICI|YEEFI ELECTFIEINICB AUBTFIALIA PTY. LTE!. 178-1821 tsounde.v Fosd, Bnaesde, Vrcco. a 3195. a.usc.atr€
YX O DEC.
1982 Printed
in laDan
AM/FM STEREO
RECETVER
Modol Volteg€ R6mrrks
SX-202/KU AC12OVonly U.S.A.model
sx-202/Kc AC120V
only Canadamodel
sx-202/s AC11OV
,12OV,22OV
and240V
{switchable} General export model
sx-202lYP AC240V
only Australia
model
SX-202L/HE AC22OV only European
continentmodel with AM,LW bandruner
sx-202LlHEZ AC220Vonly West Germany model with AM-LW band tuner
o This service
manualisapplicableto the KU types.For servicing
of tlte othertypes,
please
referto the

1.SPECIFICATIONS
Amplifier Section
Continuous
Average
Power0utput
is
25
watts*
per
channel,
min.,
at
8
ohms
from
40Hertz
to 20,000Hertz
with
nomore
than
0.3%o
tolalharmonic
distortion.
TotalHarmonicDistortion
(40
Hertz
to 20,000
Hertz,
8ohms,
fromTAPE)
continuous
rated
power
output Nomorethan0.3%
12.5watts
per
channel
power
output
Nomorethan0.15%
NomorethanO.2o/"
Intermodulation
Distortion
(50
Hertz:7,000
Hertz
=
4: 1,
8 ohms,
fror;'rAUX)
continuous
rated
power
output Nomorethan0.3%
Damping
Factor
(1
kHz,8
ohms) 22
Input
(Sensitivity/l
mpedance)
PHONO .....2.5mV/5Okilohms
TAPEPLAY ' 150
mV/50kilohms
PhonoOverload
Level
(T.H.D.0.1%,
1,000H2)
PHONO . . 150mV
Output Level
TAPE REC . 150
mV
SPEAKER .... A,
B,AseriesB.off
FrequencyResponse
PHONO
(RIAA
Equalization)
. 30Hz
to 20,000H2t0'5dB
TAPEPLAY .... l5Hzto50,000Hz+ldB
Tone
Control
BASS
. r9dB (100H2)
TREBLE ... rgdB(10kHz)
Loudnessfrntour (Volum
control
setat-40d8 position)
. . +8dB
(100H2),
+6dB
(10,000H2)
Humand
Noise
(lHF,
shortcircuited,
A network)
PHONOMM.. .....71d8
TAPE
PLAY ...97d8
FM Tuner Section
*UsableSensitivity ...10.7dBf (0.9pV)
50dB
OuietingSensitivity
**MONO ....15.3d8f
(1.6pV)
STEREO .37.6d8f
(21pYl
Signal-to-Noise
Ratio
MONO ....75d8(at85dBf)
STEREO 70dB
(at
85dBf)
Distortion
(at
65dBf)
MONO 1kHz. 'O'3Yo
STEREO
lkHz. .'0.67o
1watt per channel
power
output
CaptureRatio
. ..2.ft8
AlternateChannel
Selectivity
(400kHz) .50dB
StereoSeparation
(lkHz) .35dB
FrequencyResponse . . 30Hzto 15kHz,1! [ oa
SpuriousResponseRatio. ......70d8
lmageResponseRatio ...45d8
lF ResponseRatio. ....100d8
AM SuppressionRatio ...45d8
SubcarrierProductRatio. ......31d8
MutingThreshold .27dBt
(6.3PV)
Antenna
lnput 300
ohmsbalanced,
75
ohms
unbalanced
AM Tuner
Section
Sensitivity
lHF,Loop
antenna 32OtN lm
lHF,Ext,antenna 30pV
Selectivity .....25dB
Signal-to-NoiseRatio ....43d8
lmageResponseRatio ....40d8
lF ResponseRatio. ...'45dB
Antenna AM LooP
Antenna
Miscellaneous
PowerRequirements . ,
AC120V,
60Hz
Power
Consumption
. . . 125
Watts(UL),
150VA(CSA)
Dimensions . . . . 420(W)x98(Hl x214(D)mm
16-9/16(W)
X 3-718(H) X 8-7116(D)
in
Weight
(without
package) . . . 4.3kg(9lb 8oz)
Furnished
Parts
FMT-typeAntenna .....1
AM LoopAntenna 1
Operating
Instructions 1
*Measured pursuant to the Federal Trade Commission's Trade
Regulationrule on Povnr Output Claims
for Amplifier.
*'FM muting functions with this unit whenthe signals
are weak.
The unit's internal wiresare therefore treated sothat the signals
aranot muted when the sensitiviry ismeasured.
NOTE:
Specificationsand designsubiect
to possible
modification without
notice,

2.
FRONT
PANEL
FACILITIES
O PowER
swtrcH
Push
this to s1^ritchon andoff the unit's power.
Power
is
suppliedat the depresed
( - ) switch
position
(ON)
and
turned
off atthe
released
(I) position (OFF).
@ HEADPHoNE
JAcK
Connectthe plug on the stereoheadphones
to thisjack
whenlistening
to soundthroughheadphones.
@ ToNE
coNTRoLs
BASS : The bassisincreased
when
this
control
isrotated
clockwisefrom the center
position
andreduced
whenrotated
counterclockwise.
TREBLE :
The treble is increasedwhen this control is
rotatd clockwise from the center
position
and
reduced
whenrotated
counterclockwise.
@ BALANcEcoNTRoL
This is normally kept at its centerposition. lt is rotated
whenthe volume
of sounddelivered
through
the left and
right
channels
of thespeakers
or headphones
differs.
The right channelvolumeis reduced
when the control is
rotatd toward the LEFT from the centerpositionwhile
the left channelvolume is reduced
when it is rotated
toward
theRIGHT.
O FuNcrtoN
swtrcHEs
PHONO : Press
whenlistening
to records.
FM :Press
whenlistening
to FM broadcasts.
AM :Press
whenlistening
to AM broadcasts.
@ TAPE
(ADPT)
SWITcH
This isdepresed
whenusing
a tape
deckor adaptorunit
connected
to therear
panel
TAPE/ADAPTOR
jacks.
@ LOUDNESS
SWITcH
Depress
this switchto the ON position
when listening
to
soundat a low levelof volume.
Thiswill enhancethe bass
and treble and givemore life to the soundevenat a low
volume.
@ voLUME
coNTRoL
Use this to adjustthe volume of the sounddelivered
through
the
speakers
orheadphones.
The volume is increased
when this control is rotated
clockwise
from
theminimum
"0" position.
@ TUNING
INDIcAToR
(TUNING)
Thislights
upto indicate
that anFM,AM stationhas
been
tuned
in.
@ srEREotNDtcAToR
(srEREo)
This lights
up automatically
when an FM stationbroad-
castingin stereohas
been
tunedin.
@ SPEAKERS
swrrcHEs
These
are used
to selectthe speakers
throughwhich you
willlisten
tothe
sound.
Theselected
speakersarenowworking.
A: The sound is heardfrom the speakers
connected
to
thespeaker
A terminals
ontherear
panel.
B: The sound is heardfrom the speakers
connected
to
the
speaker
Bterminalson
therear
panel.
No sound
will be
heard
when
SPEAKERS
A and Bswitches
areboth released.
This isthe position
atwhich thesound
canbeheard
throughthe headphones.
NOTE:
No sund will be heard through the geakers when both the A
and B switches are depressed if only one et of speakerc has
been
connected to either the A or B SPEAKERS terminals.
@ FREoUENcY scALE
This indicates
the frequency
of the broadcasting
station
(FM,
AM).
Thetop levelfigures
(88
- 108)indicate
theFMband.
Thebottom level
figures
(55
- 1601indicate
the
AM band.
@ TUNTNG
KNoB
Rotate
this
knobto pick
up
stations
(FM,
AM).
@ PowER
tNDtcAToR/DtAL
potNTER
r6"
L;N
t';K
t;K -IFUNCTION
l-*'-'
LFI-EI-E

3.PARTS LOCATION
FrontPanel
View
Speaker knob
AAD608
Front oanelassemblv
ANM-292
AAD€O5
Phone
jack
AKN{45
NOruSr
. Parts uithout part number connot be supplied.
o ?he I morh found on some component ports indicotes the impottonce of the
sofety foctor of the port- Therefore, uhen replacing, be sure to use
parts of identicol
desEnation.
. For your Ports Stoch Control, the fost mouing items dre indicdted uith the morhs
t* ond *.
,* CENERALLY MOWS FASTER THAN '.
This classificotion shall be odjusted by each distributor becduseit depende on model
number, temperoture, humidity, etc.
Bonnet
ANE4I O
Tuning knob
AAA{84
Knob B
(BASS,
TREBLE,
BALANCE}
AAB-317
RearPanelView
Earth
terminal
Complexterminal
AKX-073
TopView
A ** Fuse
(T1.6A)
AEK-121
A * Power
transformer
1120v)
ATT.942
e-- KnobAlvoLuME)
AAB.3'I6
Function knob A
{TAPE, LOUDNESS)
AAD6O6
Function knob B
{PHONO,
FM,
AM)
AAD€O7
AC socket
AKP-O39
Rear
panel
ADG-073
Switchassembly

4.
BLOCK
DIAGRAM
FRONT
END (1/3)
t-
| 3OOO
FM BAL
I
| 75o
L-UNBAL
l- GND
AM
I LooP
L ANT
l- ernv
Lch REC
i-rroro
l-enor.ro
I
Rch REC
L PLAY
FM
I
STEREO
Q6
LED DRIVER FM MUTE
FM IF AMP
+82
(
13.4V
D7
Q4
AM FRONT
END
trsomvl ^:
EqUALIZERAMP
sr-4
TAPE
(t/21
sr-5
LOUDNESS
+q2 -(v4l
lz.smvl
a5[, lt5omvl. _
I
fT",
(3l4.,4/41
(2/21
ON - OFF
ON - OFF
TONECONTROL
vR2-2,2-3
s2-2
SP.B
(t/2't
lr4.
rv
I PHONES
TO
Rch
S
PEAKERS
srol 1,,
,
1,,
^
;o\--<r5
acr2ov | \,,
6OHz I o{ll
qail
I r"
Sl-l: FUNCTION
(PHONO)
SI.2: FUNCTION
(FM)
sr-3: FUt{cTroN
(aM}
SI.4 : TAPE MONITOR
SI-5 : LOUDNESS
ON - OFF
ON
- OFF
ON - OFF
ON - OFF
ON
- OFF S2-I : SPEAKERS
S2-2: SPEAKERSA
I
au9 L
sr-s LJ
(4/41
FM
IFIDET MPX
rdLF TOR
IN
SMETER
DETECTOR
vco
DET.
OUT- p 691
SlG. L OUT
IN
D6 TUNING --* ar,I
':*" I
1,"=rd;Tt--17 G:405dB
POWER
AMP
sr-4 sr-5
(
2/2't ( 2/2
|
+82 AM
D4
POWER
ON/OFF MUTING
POWERSUPPLY 8 PROTECTOR
SIOI : POWER ON - OFF

5.
CIRCUIT
DESCRIPTIONS
FM FrontEnd
A unitized variable capacitor type front end
unit is used consisting of an FET RF singlestage
amp, Iocal oscillator/mixer IC and €rnIF trans-
former.
FM lF Amp, Detector
andMPX Circuit
A 2-transistor IF amp with ceramic filter is used
and the next stage
hasan IC (M51533L) contain-
ing the FM IF detector and MPX circuit. The block
diagramof IC M51533L is shown in Fig. 5-1.This
IC uses a peak detection method which can be
adjusted with a single coil. The PLL method is
employed to reconstitute the 38kHz sub-carrier
for the MPX circuit.
The IF signalis input at pin 1 and the detection
output is obtained from pin 5. The detection out-
put passes
through the muting Q4, goesto pin 9,
passesthrough the MPX circuit and the stereo
signals are obtained from pins 11 and L2. In
addition, this unit detects the presence
or absence
TL OUT ROUT
of a pilot signal to automatically switch between
stereo and mono reception by R14 which is con-
nected to pin 14. When a stereo signal is received,
pin 13 drops to the low level to light the stereo
indicator. When pin 2 is grounded, the PLL VCO
andFM IF operationstop (for AM).
FM Muting
andLED Driver
With this unit, muting is automatically activated
when the antenna input drops below 10pV. As the
antenna input decreases,the voltage at pin 3
drops, Q5 is turned off and Q6 is turned on. As a
result, the gate voltage of Q4 drops, Q4 is turned
off and the detector output circuit is blocked
(Fig. 5-1). When an FM or AM station is tuned
in, the base
potential of Qb is raised,Q5 is turned
on and the tuning indicator lights.
M5r
533L
REGULATOR
LEVEL
METER
CIRCUIT
INPUT
BUFFER
S
TER
EO
SW
ITC
H
AM
s
t-3
Fig.
5-1 FM lF, DetectorandMPXcircuit

AM Tuner
This uses a variable capacitor type tuning
circuit composed of three transistors, a 2-tran-
sistor front end and a single transistor AM IF
detector.
AF Section
The equalizer circuit has a low-noise operation
amp(2 channel)
M5218P.
The power amp hasa 25 watt output power IC
STK4141-2S
(See
Fig.5-a).
The tone control circuit isplacedin the negative
feedbackloop of the power amp.
Protective
Circuits
This unit has a circuit to detect DC voltagesat
the power amp outputs and a muting circuit that
operates
when power is turned on and off.
Fig. 5-2 shows the construction of the DC
voltage protection circuit. When a DC voltage
appears at the power amp output, either Q13
(plus) or Q14 (minus) is activated depending on
the polarity of the DC voltage and a trigger is
applied to D15. This turns on Dl5, +B1 isshorted,
the fuse on the primary side is cut and the power
supply circuit is shut off.
Fig. 5-3 shows the power on/off muting circuit.
Time constant t1 is longer than t2 so that imme-
diately after the power is turned on, the emitter
potential of Q15 exceeds
its base
potential, QL5 is
turned on to activate Q16 and Q17 and ground the
signal. A few secondslater, the basepotential of
Q15 risesto turn off Q15 along
with Q16 andQ17.
When the power is turned off, the charge of
C161 passes through D18; it is almost completely
discharged in an instant to make the base
potential
of Q15 zero.However,because
the chargeof C160
remains, Q15 is turned on and muting is activated
in the samemanner as when power is turned on.
TO
SPEAKER
swrTcHEs
Fig.5-2 DC Voltage
protection
circuit
POWERAMP
( Lch
)
MAI
N
VOLUME
BALANCE
VOLUME
--:-----J
! Dt7 Dr6 RtSl
;-:'- - J
itz
Fig.
5-3 Power
ON/OFFmuting
circuit

I
lNl(+)L
zl
tNt
(-)
r8
tN
2(+)
t7
lN2(-)
Ifi
tl
tl
L__t
t5 16
GN
3
GND 5689rO13t44 MUTING Vee OUT I OUT
2 Vee
Fig.
54 Equivalent
circuit
of power
lC
Mark No. Part No.
1. AHA-335
2. ARB-525
3. AT8-076
4. ADH-Oos
5. AHE-l02
6.
PACKING
Description
Sidepad
Operating
instructions
(English)
Loop antennaassembly
T-type antenna
Packingcase

7.EXPLODED
VIEW
AND PARTS
LIST
NOTES;
o Partswithout part number cannot besupplied.
o The I marh found on some component parts indicates the importance of the
safety foctor of thepart. Therefore, when replacing, be sure to useparts
of identical
designation.
o For your Ports Stoch Control, the fast mouing items are indicated with the marks
t* ond i.
rT GENERALLY MOTTES
FASTER THAN *.
This classification shallbe adjusted by eachdistributor because
it dependson model
number, temperature, humidity, etc.
Description No. Part No.
A
A
No. Part No. Descriptions
Speaker
switch assembly
Switch holder
Pullyassembly
LED assembly
Earth
Mounting plate
Pullyassembly
Pullyassembly
Pully holder
Headphone
jackassembly
Chassis
Bottom Plate
Binder
Earth terminal
Rearpanel
Tuningdrum
Smoother
Pointer
holder
Pointer assembly
Heat
sink
1. ANE410
2. BBZ30P080FZK
3. ATT-942
4. PMZ30P060FMC
5. AAD€O8
6. VMZ30P060FMC
7. NKgOFUC
L AAB-317
9. NKTOFUC
10. AAA-O84
11. AAB-316
12. ANM-292
13. AAD€O7
14. AAD€06
15. ASG-541
16. AAD€Os
17. AEC-784
18. AXA-373
19. AEC471
20. MTZ3oP100FZK
21. AEK-121
22. AKP{39
23. ADG{73
24. GWM-267
25. AKN-045
26. SUJSLYXSF
27. ACG-O17
28. BBT3OPOSOFZK
Bonnet
Screw (3 x 8l
Power transformer (1
20V)
Screw (3 x 6)
Speaker knob
Screw(3x6)
Nut
Knob B (BASS,
TREBLE,
BALANCE}
Nut
Tuning knob
Knob
A (VOLUME)
Front panel
assembly
Function knob B (PHONO
FM,
AM)
Function knob A (TAPE,
LOUDNESS)
Push
switch (POWEF)
Power knob
Cabinet bumper
Tuning shaft
Nylon rivet
Screw (3 x 1O)
Fuse
(T 1.6,4)
AC socket
AC power cord
Complex assembly
Phone
Jack(PHONES)
Speakerswitch
Ceramic
{0.01)
Screw (3 x 8l
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
B
A**
i*
Wireholder
A**
A
A
A
D

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