Download Pioneer SX-3800 Car Satellite TV System User Manual

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M O D E LS X . 3 8 OC
OO M E SI N F O U RV E R S I O N D
S I S T I N G U I S H EADS F O L L O W S :
Type
Volt4e
;
Remarks
KU
120V only
U . S . A .m o d e l
s/G
11 0 V , 1 2 0 V , 2 2 Q V , a n d 2 4 0 V ( S w i t c h a b l e )
U.S. Militarv model
s
1 1 0 V , 1 2 O V , 2 2 O Y, a n d 2 4 O V ( S w i t c h a b t e )
G e n e r a le x D o r t m o d e l
KC
l20V only
C a n a d am o d e l
t
H
H
H
r This servicemanualis applicableto the KU type. Whenrepairingthe S/G and S Wpe, please
seethe additionalservicemanuallp 47 -p571.Whenrepairingthe KC type. oleasesee the additionalservice
manual(ART-519).
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CONTENTS
1. SPECIFICATIONS
3
8.2
2 , F R O N TP A N E LF A C I L I T I E S
5
7
8.3 PowerAmplifier...
3 . B L O C KD I A G B A M
4 . C I R C U I TD E S C R I P T I O N S
FMTuner
I
4.2
AM Tuner
o
4.3
D i s p l a yC i r c u i t
o
4.4
EqualizerAmplifier
T o n eC o n t r o lA m p l i f i e r
4.6
P o w e rA m p l i fi e r . . .
4.7
P o w e rI n d i c a t oC
r ircuit
4.8
ProtectionCircuit
5. D I S A S S E M B L Y . . . .
P A R T SL O C A T I O N
1
D I A L C O R DS T R I N G I N G
12
12
12
14
14
16
17
19
8. A D J U S T M E N T S
8,1
FMTuner
22
23
F L I n d i c a t oC
r ircuit
24
DI E W
9 . E X P L O D EV
4.1
4.5
8.4
AM Tuner
20
25
10. SCHEMATIC
D I A G R A MP
, . C .E O A R D
C O N N E C T I OD
N I A G R A MA N D P A R T SL I S T
1 0 .1
S c h e m a t iD
c iagram
1 0 . 2 P . C .B o a r dC o n n e c t i o D
n iagram
10.3PartsList
1 1 .P A C K | N G . . . .
3l
35
...,...41
46
ADDITIONAL
S ER VI C EM A N U A L
I.SPEC|F|CAT|ONS
.....47
2 . C O N T R A S TO F M I S C E L L A N E O U P
S A R T S. . . . 4 8
3. SCHEMATIC
DIAGRAMP
, . C .B O A R D
P A T T E R N SA N D P A R T SL I S T
3.1
SchematicDiagram
49
3.2
S w i t c hA s s e m b l y{ A W S . 1 4 8 )
57
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1. SPECTFTCATIONS
PowerAmpl if ier Section
s *e rc h a n C o n t i n uPoouw
s e0 ru t p uotf 6 0 w a t t p
2
0
H
e
r
t
o
z 20,000
nelm
, i n .a, t S o h m fsr o m
t o t ahl a r m o '
Hertw
z i t hn 0m 0 r et h a n0 . 0 0 5 %
n i cd i s t o r t i o n ,
T o t a lH a r m o n i cD i s t o r t i o n( 2 0 H e r t zt o 2 0 , 0 0 0H e r t z ,
I ohms)
continuousratedpoweroutput . . No morethan 0.005%
3 0 w a t t sp e rc h a n n epl o w e ro u t p u t
No morethan 0.005%
I n t e r m o d u l a t i oDni s t o r t i o n( 5 0 H e r t z: 7 , 0 0 0H e r t z= 4 : 1 )
No morethan 0.0057o
continuousratedpoweroutput
30 wattsperchannelpoweroutput
No morethan 0,005%
F r e q u e n cR
y esponse
. . . . . 5 Hertzto 200,000Hertzl! OA
l n p u t S e n s i t i v i t y / l m p e d a n( P
c eO W E RA M P l N )
1v/50 kilohms
or,rri
A, B, A+B
Speaker
"-:
:: ::"::'': 1*:": 1oi*
He*z'
80hms)
H u m a n d N o i s e ( l H F , s h o r t - c i r c u i t e dA, n e t w o r k )
115d8
Preamplifier Section
I n p u t ( S e n s i t i v i t ym/ lp e d a n c e )
2 . 5 m V / 5 0k i l o h m s
PHONO
A U X , T A P EP L A Y 1 , 2 . . . . . . . 1 5 0 m V l 5 0 k i l o h m s
P h o n oO v e r l o a dL e v e {l T . H . D . 0 . 0 0 5 %1,, 0 0 0H e r t z )
.. .. . 250mV
PHONO
(
m
p
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d
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c
e
)
L
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l
/
l
Output
..,. 150mV
T A P E R E C I ,.2.
PREAMP
O U T ( R r _ 5: 0 k i l o h m s )
- . . . . 1 V / l k i l o h m {sV o l u m em: a x . }
T o t a lH a r m o n i cD i s t o r t i o n( 2 0 H e r t zt o 2 0 , 0 0 0H e r t z )
No more than 0.005%
P H O N O( R E CO U T )
{ 1 0 Vo u t p u t }
A U X , T A P EP L A Y1 , 2 . . . . . . No morethan 0.005%
( 1 0 Vo u t p u t )
F r e q u e n cB
y esponse
P H O N O( R I A A E q u a l i z a t i o n )
t0'2dB
Hertz
to 20'000
or", iori ,ro" i ,';'o^u"'
7Hzto 8o,0ooHertz]f aa
Tone Control
tSdB(100H2)
B A S S.
TREBLE
..... r',l0dB(10,000H2)
1 5 H z( - 6 d B / o c t . )
SubsoniF
c i l t e r.
LoudnessContour (Volume control set at *40d8 position)
. . . . + 6 d B( 1 0 0 H 2 ) , + 3 d(B1 0 , 0 0 0 H 2 )
(
l
H
F
, s h o r t - c i r c u i t eAd ,n e t w o r k )
N
o
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s
e
a
n
d
Hum
PHONO.
.....82d8
A U X , T A P E P L A1Y, 2 . . , . . . . 1 1 O d B
....-20d8
Attenuator.
FM TunerSection
1 0 . 3 d B f{ 1 . 8 i t v )
Usable
S e n s i t i v i t(yl H F)
O
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50dB
1 6 . 2 d B f( 3 . 6 s V )
MONO
3 7 d B f( 3 9 p V )
STEREO
Ratio
Signal-to-Noise
8 3 d B( a t 6 5 d B f )
MONO
78dB (at 80dBf,
STEREO
Distortion(at 65dBf)
MONO l00Hz.
0.1o/o
a.a7%
lkHz.
0.15%
6kHz .
O.2Yo
S T E R E OI O O H z .
0.15%
lkHz .
0.25%
6kHz r.odB
CaptureRatio. ,
AlternateChannelSelectivity
..,..,7ft8
400kHz
StereoSeparation
......45d8
1kHz.
...... 35dB
30H2to15kH2.
FrequencyResponse
....2}Hzto15kHz1!loe
S p u r i o u s R e s p o nRsaet i o , . . . . . .
...
lmageResponseRatio
....
lFResponseRatio..
...
AMSuppressionRatio
S u b c a r r i e r P r o d uR
c ta t i o . . . . . . .
....
SCARejectionRatio
M u t i n gT h t e s h o l d
Antennalnput .
65dB
65dB
90dB
55dB
50dB
64dB
1 9 . 2 d B f( 5 p V )
300 ohms balanced,
7 5 o h m su n b a l a n c e d .
Eix-3El00
AM Tuner Section
S e n s i t i v i t(yl H F , F e r r i t ea n t e n n a ) . 3 0 0 p V / m
{ l H F , E x t . a n t e n n a.} . . 1 5 p V
Selectivity
.....30d8
Signal-to-NoiseBatio .... 50dB
lmageResponseRatio
... 40dB
lFResponseRatio..
.... 40dB
Antenna
.... Ferritelooostickantenna
Audio Section
l pedance)
O u t p u t( L e v e l /m
FM(100%Mod.).
.....
.....
A M ( 3 O % M o d.. )
6 5 0 m V l k1i l o h m s
200mV/1kilohms
Semiconductors
f C s . . .
F E T s .
Transistors
Diodes
. . . . . . . 1 7
. . . . . . . 6
...,.71
.......58
Miscellaneous
PowerRequirements
P o w e r C o n s u m p t i. o n
Dimensions
W e i g h (t w i t h o u tp a c k a g e )
.... ACi20V,60Hz
... 200W(ULl
. . . . 5 0 6 { W } x 1 6 4 { H x)
434{D}mm
x 6) - 7 / 1 6
19-15116(W
( H ) x 1 7 - 1 1 1 6 ( iDn )
1 6 . 2 k 9( 3 5 1 b 1 2 o z )
Parts
Furnished
O p e r a t i n g i n s t r u c t i o.n.s. . . . . . . 1
FMT-typeantenna
..... I
* Measured Dursuant to the Federal Trade Commission's
Regulation rule on Power Output Claims for Amplif iers,
Tnde
NATE:
Specifications and the design subject to poisible modifications
without notice due to improvements.
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2 . T R O N T P A N E LF A C I L I T I E S
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S WT T C H
c PO W ER
Set this switch to ON to supplypower to the receiver.
Therewill be a shortdelaywhen it is setto ON, because
the muting circuit has been actuatedto suppressthe
unpleasantnoisethat is sometimes
generated
when the
poweris switchedon and off .
swtrcHEs
O spERrER
Depressthe switch corresponding
to the speakers
conn e c t e dt o t h e S P E A K E R S
t e r m i n a l (sA o r B ) o n t h e r e a r
panel.
You can depressboth of thesebuttonsto listento the
sound from two pairs of speakerrystemsat the same
time.
@ gnlcHrNEss
sELEcroR
Use this switch to selectthe brightnessof the power
m e t e ra n dt h e f r e q u e n c d
yisplav.
B R I G H T : W h e nu s i n gt h e r e c e i v eirn d a y l i g h to r o t h e r
b r i g h tl o c a t i o n s .
DIM:
At night or in dark locationswhen the existi n gb r i g h t n e si s t o o h i g h .
C I P O W E RM E T E R
This meterallowsyou to readout the ratedpowerlevel
on the fluorescentdisplaytube when speakerswith a
nominal impedanceof g ohms are connectedto the
speakerterminals.
@ orel PoINTER
This pointerindicatesthe broadcasting
stations.
@ bunnrz LocKEDtNDtcAToR
This indicatorlightsup after the optimum tuning point
hasbeenobtainedand displaysthat the receiving
stateis
s t a b i l i z ebdy t h e b u i l t - i nq u a r t zl o c k c i r c u i t .
O T T US T E R E OI N D I C A T O R
This indicator lights up when receivingan FM stereo
programif the FM mutingoff switchis released.
, o S I G N A LI N D I C A T O R
This indicatorlightsin sequence
from left throughright
duringthe tuning of an AM or FM broadcastin accordance with the strength of the signalsbeing received.
The optimum tuning point is where the maximum
numberof indicatorslight.
tNDtcAToR
@ rururruc
When tuning in an FM station,the optimum reception
point is indicatedwhen the center indicator lights up.
When the left indicatorhascome on. rotate the tuning
k n o b s l i g h t l yc l o c k w i s eW
. h e nt h e r i g h ti n d i c a t o cr o m e s
on, rotatethe knob slightlycounterclockwise-
@ r nEouENCYDTSPLAY
T h i si n d i c a t etsh e f r e q u e n c yw h i c hi s t u n e d .
With FM reception,the letters,,FM.,appearon the left
o f t h e d i s p l a ya n d ' , M H z , 'o n t h e r i g h t .W i t h A M r e c e p .
.
t i o n , " A M " a p p e a ro
s n t h e l e f t a n d , , k H z .o
n theright.
These changewhen the function selectorposition is
changed.
KNOB
0 rururruc
Usethis knob to tune in to broadcasting
stations.
c} FM MUTTNG
OFFSWTTCH
Whenthis switch is released
and an FM broadcasttuned
in, the muting circuit is activatedinsideto suppress
the
annoying interstationnoise betweenthe broadcasting
frequencies
for noise-free
reception.Whenthe broadcasting station is far away or when receivinga station in a
fringearea,set the switch to the OFF positionand then
tune in. lf there is a broadcasting
stationwith a strong
r--
signallevel on the air next to a stationwhoseprogram
you want to receive.you may not be able to tune in
satisfactorilvbecausethe sound will be drowned out
b y t h e s t r o n g e rs i g n a l sl.n c a s e sl i k e t h i s , s e t t h e F M
M U T I N G O F F s w i t c ht o O F F { d e p r e s s epdo s i t i o n )a n d
tune in. The mutingcircuitdoes not work whenthe
tuner is receiving
A M b r o a d c a s t sl f. t u n i n g h a s b e e n
performedafter the FM MUTING OFF switchhasbeen
depressedand a station selected,the quartz locked
circuit is set to the OFF mode and the LOCKED
i n d i c a t odr o e sn o t l i g h t .
NE L E C T O R
{ " } F U N C T T OS
Depressthe function switch which corresponds
to the
program source.Turn the volume control down first
before selectinga different function switch while the
soundfrom one programsourceis beingreproduced.
FM:
Depress
this switchfor FM broadcasts.
AMr
Depress
this switchfor AM broadcasts.
AUX:
D e p r e s st h i s s w i t c h w h e n l i s t e n i n gt o a n
audio componentconnectedto the AUX
jacks.
PHONO: Depressthis switch when playinga record
on the turntableconnectedto the PHONO
jacks.
NATE:
Only one function swirch should be deplessed at a time.
@ volunnEcoNTRoL
Use this control to adjust the output level to the
Turn it clockwiseto increase
speakersand headphones.
t h e o u t p u t l e v e.l N o s o u n dw i l l b e h e a r di f y o u s e ti t t o
"o."
(} MUTINGSWITCH
Set this switch to the *20d8 positionto attenuatethe
audio output by 20d8. There is no needto adjustthe
v o l u m ec o n t r o l i f y o u t h i s s w i t c hw h e n t u r n i n gd o w n
t h e a u d i oo u t p u t t e m p o r a r i l ya n d w h e n c h a n g i n go v e r
recordsor tapes.
L O U D N E SS
SW I T C H
W h e n l i s t e n i n gt o a p e r f o r m a n c ew i t h t h e v o l u m e
control turned down, depressthis switch and the bass
a n dt r e b l ew i l l b e a c c e n t u a t e d .
W h e nt h e v o l u m ei s l o w ,t h e h u m a ne a rf i n d si t h a r d e tro
h e a rt h e b a s sa n d t r e b l et h a n w h e n t h e v o l u m ei s h i g h .
The loudnessswitch is thus designedto compensate
for
t h i s d e f i c i e n c yB. y d e p r e s s i ntgh i s s w i t c h ,t h e b a s sa n d
treblecome throughmuch more stronglyand the sound
t a k e s o n a p u n c h e v e n w h e n t h e v o l u m ec o n t r o l i s
turneddown,
@ gRl-Rr\cEcoNTRoL
Use this control to balancethe volumeof the left and
right channels.First, however,set the mode switch to
M O N O . l f t h e s o u n d a p p e a r st o b e l o u d e r o n t h e r i g h t , i t
meansthat the volume of the right channel is higher.
T u r n t h e b a l a n c ec o n t r o l t o t h e l e f t a n d a d j u s t . C o n v e r s e l y .i f t h e s o u n d a p p e a r st o b e l o u d e r o n t h e l e f t , i t
meansthat the volume of the left channel is higher.
Therefore, turn the balance control to the right and
adjust. After adjusting. return the mode switch to
STEREO.
SWTTCHES
@) TAPEMONTTOR
Employ for tape playback or to monitor a recording in
progress.
1:
P l a y b a c ko r m o n i t o r i n g o f a t a p e d e c k c o n n e c t e dt o
'l
the TAPE jacks.
2:, Playback or monitoring of a tape deck connected to
the TAPE 2 iacks.
NOTES:
l. 8e sure to set the switches to the upper IOFF) position
whenplaying recordsor listening to broadcasts.
2. Whenrecordingwith tvvotape deckssimultaneausly.do nat
operate the tape monitor I switch as this will interrupt the
signatto the T,APE2 deck.
G} MODESWITCH
Use this switch for selectingmono or stereoperform.
ances.
S T E R E O : S e t t o t h i s p o s i t i o nf o r n o r m a lo p e r a t i o n s .
M O N O : W h e n s e t t o t h i s p o s i t i o nt,h e l e f t a n d r i g h t
c h a n n e ls i g n a l sw i l l b e m i x e d a n d r e p r o d u c e d m o n o p h o n i c a l l fyr o m b o t h s p e a k e r
systems.
A D L O W F I L T E RS W I T C H
When this switch is set to 'lSHz,a 6dB/oct attenuation
c a n b e p r o v i d e d{ o r f r e q u e n c i e sb e l o w 1 5 H 2 . T h i s
m e a n st h a t y o u c a n c a n c e lo u t n o i s ei n t h e u l t r a - l o w
frequencieswhich is generatedby low-pitchedrumble
from a turntable and other forms of distortion.
A l t h o u g ht h i s n o i s ec a n n o t b e h e a r d ,i t c a n g e n e r a t e
i n t e r m o d u l a t i odni s t o r t i o na n dd a m a g et h e s p e a k e r s .
@ B A S SA N D T R E B L EC O N T R O L S
When turned clockwise from the OFF position, the
r e s p o n s ei n t h e b a s s a n d t r e b l e r a n g e , r e s p e c t i v e l y i, s
boosted. Turning counterclockwise attenuates the
reSponse.
A t t h e O F F p o s i t i o nt h e t o n e c o n t r o l c i r c u i t i s b y p a s s e d
and frequency responseis flat.
JACK
€} HEADPHONE
P l u g t h e h e a d p h o n e si n t o t h i s j a c k w h e n y o u w a n t t o
listen through your stereo headphones.
Releaseboth speaker switches if you want to listen to
t h e s o u n d t h r o u g h y o u r h e a d p h o n e so n l y .
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3. BLOCK DIAGRAM
R F Block
rc { PA3007-A )
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4 . C I R C U I TD E S C R I P T I O N S
tor, there is no deterioration in separationat the
low frequency end.
Besides the decoder and muting circuits, the
PA4006-A also incorporatesthe pilot signalcanceller, stereo auto selector, VCO killer circuit, ivluT
amplifier, and MUT control circuit.
4.1 FM TUNER
Front End
The FM front end of SX-3800 includes a 3
ganged tuning capacitor, a dual-gate MOS FETequipped L-stage RF amplifier, and a modified
Clapp circuit local oscillator. This oscillator is a
voltage controled oscillator employing a vari-cap
(variable capacitancediode). When the quartz-lock
system (refer to "Quartz-lock system") is not in
operation, a constant voltage is applied to the
diode.
Compositesignal
dhllL'
Output
InOut
JU1IIIUIJIJUUI .^
,is".rc-1q/
Switchins
lF Amplifier and Detector
These employ 3 ICs and 3 dual-elementceramic
filten. The IC (HA1201) of the first 2 stageconstitutes a single-stagedifferential amplifier currentlimiting limiter. The IC (PA3007-A) in the third
stage,an improvement on the former IF system IC
(PA3001-A), includes an IF limiter amplifier,
quadrature detector, meter drive, and other circuits. Performance in terms of distortion, S/N
ratio, delay characteristics,and other parameters,
shows a marked improvement in comparison to
the PA3001-4.
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F i g . 4 - 1 C h o p p e rt y p e s w i t c h i n gc i r c u i t
ouartz-Lock system
The quartz-lock system featuredin the SX-3800
stereo receiver is a frequency servocontrol system
employinga crystal resonator.Any displacementin
the intermediate frequency (iF) is detected as a DC
voltage by the discriminator (equipped with a
crystal resonator), resulting in the local oscillator
frequency being corrected and subsequently
locked. This extremely stable frequency servocontrol system thus ensuresthat tuned frequencies
remain tuned securelyfor as long as required.
When the IF signalappearsat pin no.l? of the
IF system IC (PA300?-A), it is amplified and
applied to crystal detector (see Fig. 4'2) which
consistsof diodes connectedin parallel in a series
resonance circuit equipped with a crystal resonator. The resonancefrequency is the sameas the IF
frequency (10.?MHz), which meansthe impedance
at this time will be minimal, resulting in the output
being reduced to a minimum level. If the input frequency increases,the reactanceof the capacitance
Multiplex Decoder
The recently developed multiplex decoder IC
(PA4006-A) combinesMPX decodingwith muting
functions in a single IC, thereby handling the
functions of the more conventional MPX IC
(PA1-001-A)and AF MUTING IC (PA1002-A).
Distortion ratings and SIN ratio have been
further improved by incorporating a chopper type
MPX decoder. The chopper type switching circuit
(see Fig. 4-1) operates by switching the signal
either to ground or to the through circuit, thereby
eliminating the generation of unwanted noise or
distortion. Furthermore, since the PA4006-A features DC direct-coupled switching with the detec-
t
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H
H
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;
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FM FRONT ENO
;
OC AMP
WITH LIMIiER
CRYSTAL DTTECIOR
LPF1
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Fig.4-2 FM quartz-locksYstem
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stage (C) is reduced, and the reactanceof the inductance stage (L) increased, resulting in AM
detection by D2 which leavesthe positive portion
of tlie IF signal.If the input frequencydecreases,
L
stage reactance is decreasedand C stagereactance
increased,resulting in AiVl detection by D1 which
leavesthe negativeportion of the IF signal.The L
stage and C stage reactancesincreaseas the deglee
of detuning in the respective directions is increased, resulting in a subsequent increase in the
detector output. By thus attaining S-curvecharacteristics,FM detection becomespossible.Sincethe
IF signal is an FIvI signal frequency deviation due
to modulation will be symmetricalabout a central
axis, And if the central frequency is equal to the
resonancefrequency, the detector output DC level
will be zero. If, however,there is any displacement
in the central frequency, frequency deviation in
respect to the detector will become asymmetrical,
resulting in the generationof a DC voltage. This
DC voltage is passedthrough LPF1 (IF filter) and
LPF2 (AC filter) to form a correction voltage
which is applied to the variablecapacitancediode
in tlre iocal oscillator, thereby correcting the
oscillator frequency to obtain a constant tF (i.e.
a constant tuned frequency).
Since the central frequency of the crystal detector is regulated by the crystal resonator, tuned frequenciesof extremely high stability are obtained.
r Limiting the Locking Range
If lhe quartz-lock range is too wide, it will
overiap with strong adjacent broadcastingfrequencies and result in considerabletuning difficulties.
A DC amplifier is therelore used as a limiter
(limiter action by NFB circuit zenerdiodes)which
restricts the voltage applied to the variable capacitancediode, thereby limiting the quartz-lockrange.
A DC voltage appea$ at pin no.L3 of the IF
system IC (PA3007-A) when the antenna input
level drops below 5pV, or when the tuned frequency has been detuned by more than r100kHz.
This DC voltage (FM muting signal) is applied to
the gate of Q2 (fET) via a Schmitt circuit, resulting in the FET being turned on, and the quartzIock circuit being turned off.
4.2 AM TUNER
The AM tuner section consists of a 2-ganged
tuning capacitor plus an IC (HA119Z) which contains a l-stage RF amplifier, converter, 2-stageIF
amplifier,detector, and AGC circuit.
The AM STEREO OUT terminal on the rear
panel is for connecting to an AM stereo broadcast
decoder adaptor. The signal appearing at this terminal is the converter output passed via a buffer
( emitterf ollower) stage.
4 , 3 D I S P L A YC I R C U I T
FrequencyDisplay
Frequencies received by the SX-9800 are displayed in digital form by fluorescent indicator tube
(FL tube). Each digit employs up to ? segments
(a - e) (see Fig. 4-3) to display all numeralsfrom
0 to 9 (with the exception of the left hand digit
which employs only 2 segmentsb and c).
o
fi'
Fig.4-3 7-segment
digitdisplay
The signal source during both AM and FM reception is the local oscillator. The signal is passedvia
a buffer amplifier (FET) to the prescalar IC
(M54451P) where it is subjected to frequency division (1/8 for AM and L/80 for FM) before being
rFRlied to the frequency counter IC (pDb0Og).
This IC is responsible for the dynamic drive of the
?-segment S-digit display (each digit being turned
on according to time-sharedsequentialscanning).
An outline of the composition of pDb009 is
given in block diagram form in Fig. 4-b. With the
FL tube a - g segments(anode) for each digit connected in parallel, the D1 - Db time division pulse
signals (see Fig. 4-6) apptied to each grid (independent grid for each digit) result in the digik
being lit up in successionfrom the left hand side.
Each digit is lit up for lms during each bms interrc (M5445rP)
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AM LOCAL
osc.sr6NAL
FM LOCAL
OSC.SIGNAL
FM"aM sELgcrroN
SI G N A L
FL TUBE
a
Fig.4-4 Frequencydisplayblock diagram
a
SEGM€NT DRIVER
OIGIT ORIVER
MU !TI PLE XER
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PRESETAEL€ 5-DIGIT
OECIMAL COUNTER
22-8lI
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GND
F i g . 4 - 5 B l o c kd i a g r a mo f P D 5 0 0 9
val. Pin no.? of PD5009 is the brightnessselector
terminal. The time division pulse width is set to
8009s for H level input signals, and to 200ps for
L level signals, thereby varying the degree of FL
tube brightness (by varying the segment lighting
period). Note that since the pov.er indicator FL
tube is driven by static drive, the degreeof brightnessmay be varied by changingthe grid voltage.
The 5.12MHz crystal oscillator generates the
basic signai used in the preparation of the time
division pulse signal and the counter gate circuit
control signal.
Terminals S1 - S4 (pin nos.3 - 6) are used in
designating reception mode. The 2 reception
modesemployed in the SX-3800 (seeTable 1) are
designated by varying the combination of input
levels (H and L). The 3 different IFs during FM
mode are required in coping with IF offset in the
IF ceramic filter stage, 53 and 54 being preset
during FM mode according to the ceramic filter
characteristics.
Although the SX-3800 FM stage quartz-lock
system is capable of locking any frequency within
the FM band, the L0kHz digit (digit in the second
decimal place) in the FM frequency display will
appearonly as 5 or 0.
The frequency display FL tube also incorporates
the TUNING and SIGNAL indicators. And although the segments(anode) for these indicators
are static driven by the corresponding drive circuits, the edd is driven according to the D3 time
division pulse timing, thereby placingthe segments
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F i g . 4 - 6 D 1 - D 5 t i m e d i v i s i o np u l s es i g n a l s
under dynamic drive. In addition, the AM and FIW
indicators in the frequency display section are lit
according to the Db timing, while the kHz and
MHz indicatorsare lit accordineto the D1 timine.
MODE
FM
AM
s1
S2
s3
I
lF {MHz)
H
L
L
H
1 07 3
H
L
H
L
10.70
H
L
H
H
't0.67
L
H
H
L
450kHz
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F i g .4 - 7 S I G N A Li n d i c a t odr r i v ec i r c u i t
The SX-3800 SIGNAL indicator consistsof an
FL tube 5-point indicator display.The signalmeter
drive signal obtained from the FM IF system IC
(PA300?-A) and AIVI tuner IC (HA119?) is first
amplified and then applied to the indicator drive
IC (HA12010). This IC contains12 pairs of voltage
comparators similar to those employed in the
power indicator circuit, b of thesepairsbeingused
to drive the SIGNAL indicator.
T U N I N G l n d i c a t o rC i r c u i t
The TUNING indicator consists of a center
tuning indicator (which lights up when a broadcasting station frequency is properly tuned) and
2 detuning direction indicators which indicate the
direction in which the station has beentuned awav
from. The correspondingdrive circuits are outlinei
in Fig. 4-B below.
The TUNING indicator is activated once the
station has been tuned to within t100kHz of the
center frequency. This is because
e16 is turned on
and Q21 turned off (resultingin the detector
dif_
feren^tialamplifier le19 & e20J being tumed
off
and Q24 beingturned on) by the FM muting signal
appearing at pin no.lB of the IF system IC
{PA3007-A) and passed via the Schmitt circuit
(Q17 & Q1B) rvhen the station is tuned
away by
m o r et h a n t 1 0 0 k H z .
The DC voltage on pin no.4 of pAB007_A
describesan S curve when tuning to and away from
a
particular broadcastingfrequency, the voltage
on
pin no.2 serving as the reference level. This
DC
SCHMITT
CIRCUII
rc(PA30(r/-A)
Fig.4-8 TUNINGindicator
drive.circuit
voltage is amplified by the differential amplifier
(Q19 & Q20) and then applied to a polarity detec_
tor switch circuit (eZZ & e2g).
When tuning to a frequency from the high fre_
quency side (or tuning away from the frequency
to a higher frequency),the voltageon pin no.4 will
be higher than that on pin no.2. The e20 collector
voltage will thus be lowered and the
e1.g collector
voltage raised, resulting in e2B being tumed on,
and the higher frequency (right hand side) detuning direction indicator also being turned on. When.
on the other hand, the broadcasting frequency is
approachedfrom the iow frequency side (or when
tuning away to a lower frequency) the pin no.4
voltage will be lower, resulting in Q22 being tumed
on to light up the lower frequency(left hand side)
detuning direction indicator. When either Q22 or
Q23 is on, the Q24 base voltage will be high,
resulting in Q24 being tumed on and Q25 tumed
off, which means that the center tuning indicator
will not be lit up,
Once the broadcastingfrequency has been tuned
properly, the voltages on pin nos.2 & 4 will be
equal. Consequently,q22 and Q23 will both be
turned off, which means that neither of the detuning direction indicators will be on in this case.And
since Q24 is tumed off becauseof the decreased
basevoltage, Q25 will be turned on, and the center
tuning indicator light up. Furthermore, C77 is
chargedup via R99, resuiting in Q26 beingtumed
on, thereby lighting up the Quartz Locked indicator LED.
4 . 4 E O U A L I Z E RA M P L I F I E R
?his circuit is an NFB type equalizer amplifier
with newly developed high performance IC
(HA1201?P).
This IC is a low-noise and low distortion type,
and provide an openloop gain of 105d8. The main
performance specifications for this circuit include
a voltage gain of 35.5d8 (at lkHz), a phono
dynamic margin or maximum allowable input level
of 250mV (1kHz, 0.}Abc/oTHD), S/N ratio of
82dB (at 2.5mV input, IHF-A), and equalization
within t0.2dB (20H2 * 20kHz).
4 . 5 T O N E C O N T R O LA M P L I F I E R
This circuit is an NFB type tone control amplifier with newly developed high performance IC
iHA12017P).
4 . 6 P O W E RA M P L I F I E R
Amplifier Circuit
The basic circuit arrangement of the power
amplifier is shown in Fig. 4-9. The first stageis a
differential amplifier comprising PNP twin transistor (Q2), the load circuit of which is a current
mirror employing an NPN twin transistor (Q3).
The current mirror provides push-pulloperation in
this stage,which seruesto cancel even harmonics
and further increasegain.
Q1 in the input circuit absorbsoutflorv of base
current from Q2, and preventsthe generationof a
DC voltage. BecauseQ1 follows any temperature
drift in Q2, temperature drift of the center point
voltage is prevented.
The pre-driver stage (Q4, Qb) is a Darlington
arrangement,the load circuit of which employs a
constant-currentsource (Q6) resulting a high voltagegain.
The power stagebias voltage is supplied by the
high speed bias servocontrol circuit. The high
speed bias servocontrol circuit provides nonswitching operation in the power stage (refer to
"High SpeedBias ServocontrolCircuit").
The power stage(Q13 - Q16) is a 2-stageDariington arrangement, the last stage is SEPP circuit
employing an SL RET (Super Linearit5' Ring
Emitter Transistor).The RET is a kind of IC consistingof a number of smail transistorson a single
chip, with each transistor being connected ir"r
parallel via an emitter resistor. This provides
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F i g . 4 - 9 P o w e ra m p l i f i e r
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excellent high frequency characteristicscomparable lo those of a small-signaltransistor. Furthermore, becanselhere is no time clonstantin the NFB
circuit ir-rthe lorv-frecluencyregion, amplification
is possibiedorvn to DC (DC inputs will be cut off,
hor,vever,
by the input coupling capacitor).
'I'he
circuit featuresdescribedabove provide an
extremely wide polver frequency range (60W
+ 60W, 101-lzto ZOkHz,THD 0.005Va,Bdl).
High SpeedBiasServocontrolCircuit
By operating the power stage only within the
active region (no possiblecut-off) and with minimr-rmidle current, the high speedbiasservocontrol
circuit prevents the generation of switching distortion and reducesheaf loss.
OperatingPrinciple
Since idle current flows through normal classB
SI)PPporver stages(see Fig. 4-10) when no signal
is appliecl,the DC level is shifted by D and VR by
a fixed amount (w'itir the voltage acrosspoints X
ancl Y sen'ingas a bias).The voltagesacrosspoints
X and Z, and Z and Y at this time will be equal.
When the positve portion of a signalis applied to
this circuit, the porver stage current on the NPN
side is increased,and the voltage(Vn1) acrossboth
ends of RB1 also heing increased,resultingin the
voitage across point X and Z being increased.
However, since the voltage acrosspoints X and Y
is practically constant, the voltage across points
Z anrl Y (PNP power stage bias) will be decreased,
resultingin the PNP power stagebeing cut off.
'I'he
high speed bias servocontrol circuit increasesthe voltage acrosspoints X and Y by the
same amount as the voltage increaseacrosspoints
X and Z, thereby cancellingthe voltage decrease
acrosspoinls Z and Y, and preventing the PNP
polver stagefrom being cut off.
This high speedbias servocontrolcircuit is outlined in Fig. 4-11. lVhen there is no signalapplied
to the crrcuit, Q1 and Q2 are almost cut off,
while Q3 and Q4 u'ill be on. The voitage across
fhe collector and baseof both of these transistors
(Q3 and Q4) at this time may be disregarded.Consequently, rvith the power stage bias circuit consistingof ,trPN junctions formed by Q3, D3, and
Q4, and VR1. this circuit is equivalent to the
previouscircuil shownin Fig. 4-10.
With R1 and D1 ensuringa constantflow of current, the baseof Q1 and point Z may be brought
to the samelevel on an AC basis(levelfluctuations
due to the signal) by a simple shift in DC level.
Furthermore, Qf may be considered emitterfollower lvitli R3 as the emitter resistance.
When the voltage acrosspoints X and Z is increased by tl're positive portion of the signal applied to this circuit, it becomesthe input signal
of this emitter-follower (Q1). Since the emitterfollower voltage gain is practically 1-, a voltage
more or lessequal to that of the input signal(that
is, the voltage increaseacrosspoints X and Z) is
produced at R3. And the R3 voltageis the voltage
applied acrossthe baseand collector of QB which
forms part of the power stage bias circuit. So the
bias voltage applied to Q3 will be in excessby the
same amount that the voltage acrosspoints X and
Z is increased(by positive portion of the signal)
above the voltage level when no signal is being
applied. Consequently, the increase in voltage
acrosspoints X and Z cancels the decreasein voltage across points Z and Y, thereby maintaining
the idle current without cutting the PNP power
stage off (noting that there actually is a slight
decreasein current). For the negativeportions of
the signal, Q3 and Q4 are operated in the same
rnanner, thereby preventing the NPN power stage
from beingcut off.
In other words, the high speedbias servocontrol
circuit acts to prevent any "poler stagecut-off"
signalsfrom being applied to the polyer stage.
PRE- ORIVER
F i g .4 - ' l0 N o r m a lp o w e rs t a g eb i a sc i r c u i t
PFE. ORIVER
F i g .4 - 11 H i g hs p e e db i a ss e r v o c o n t r o
c il r c u i t
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('tA73t8P)
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OFFSET COM.
PENSAIOR
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F i g . 4 - 1 2 P o w e r i n d i c a t o rc i r c u i t
The SX-3800 output power indicators feature
fluorescentindicator tube (FL tube). In this tube,
thermionic emissions from the cathode are accelerated into the fluorescent substance of the
segmentalanodes,resulting in the emissionof light.
This tube is used to indicate numerals,letters,and
other symbols.
An outline of the FL tube drive circuit is shown
in Fig. 4-12. The output circuit sj"tnalis applied to
pin no.6 ( ) of the IC (TA?318f -A). The IC contains a detector circuit, conpressor (40d8), and
peak hold circuit for both left and right channels.
The dynamic range of the signalis thus contracted
by 40dB to obtain a "peak held" DC voltage.
The output pou'er indicator segmentsof tire FL
tube are driven by the HA12010 ICs (one for each
channel) equipped rvith 12 pairs of differential
amplifiers. These amplifiers are biasedat increasing
levels,so each amplifier lvill commenceto operate
separatelyas the input level increases.And since
these amplifiers apply the voltages to the output
power indicator segmetrts,each successivesegment
will light up in turn as the input level rises.
14
CIRCUIT
4.8 PROTECTION
The purpose of this circuit is to protect the
speakersand the power amplifiers.The relay in the
output circuit is automatically opened in any of
the following cases:
L. During the "transient operations" lvhen the
power supply is turned on and off.
2. Upon detection of an overload, causedby a
short circuit in the ioad.
3. Upon detection of a DC voltage in the output
causedby component failure or accident.
MutingOperationwhen PowerSupply is Turned
On and Off
With reference to Fig. 4-13 when the porver
supply is turned on, Q3 turns off due to *81 (l'he
time constant of the *81 circuit is very sma11.).
If there is no input (DC) on Qb and Q6, they will
be off, and the timing capacitor C1 chargesup
through R8 and R6, and thus Q4 turns on. \Vhen
Q4 condr,rcts,tire relay operates,and the output
muting on the power amplifier will be removed.
When the polver supply is turned off, -81 rvill
abruptly decay, and Q3 will conduct owing to the
resiclualcomponent of +81. As a result, C1 rvill
rapidly discharge,Q4 will ceaseto conduct, rvhereupon the relay will become de-energizedand
restoremnting.
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OverloadDetector
The overload detector circuit incorporates the
load (RL) in one side of a Wheatstonebridge.The
base and emitter of a sensingtransistor (e1) are
connected to the opposite corners of the bridge,
so if RL decreases,
Q1 will becomeforward biased.
If RL falls below a prescribed value, e1 will turn
on, thereby C1 will rapidly discharge.As consequence, Q4 will turr on and the relay will become
deenergized, thus causing the output circuit to
open.
DC Voltage Detector
The output circuit is connectedto the e6 emitler and Q5 base via a low-pass filter (Rg, C2).
Any DC voltagesappearingthe output circuit of
the porver amplifier, it wil] be applied to the e6
emitter and Q5 base.If the voltage is positive,eb
turns on. C1 will rapidly discharge.If the voltage
is negative,Q6 turns on. C1 will rapidly discharge.
As conseqnence,Q4 will turn on and the relay will
become de-energized,thus causing the ourpur
circuit to open.
Fig. 4-13 Protectioncircuir
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15
5. DISASSEMBLY
BonnetCase
Remove the two screws O ot each side of the
bonnet case.
Bottom Plate
Remove the fifteen screws O
bottom plate.
i
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to detach the
Front Panel
Remove the all control knobs except push
knobs. Remove the two screws @ and two nuts
Q from the front Panel.
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A\
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Front panel
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6. PARTS LOCATTON
Front Panel
The fi marh found on sotne camponent parts indicates
the importance of the sofety factor of the part. Therefore, when replacing, be sure to use parts of identical
designation.
Push knob B
AAD-227
F r o n t p a n e la s s e m b l y AN 8.851
AAA.O66
AAD,226
Knob
AAB.24O
L e v e rk n o b
AAB-239
Front View with PanelRemoved
F l u o r e s c e n ti n d i c a t o r t u b e
AAV-OO7
F l u o r e s c € nitn d i c a t o rt u b e
AAV.OO9
R e m o t ep u s hs w i r c h ( S P E A K ER S )
ASX,135
P u s hs w i t c h ( B R I G H T N E S S )
ASG,230
t
Dial shaft assembly
AXA.264
7
P u s hs w i t c h ( F M M U T I N G I
ASG-230
; L e v e ' s w r r c h( P O W E R )- . . .
ASK-507
P h o n ej a c k l P H O N E S )
AKN.O30
'l
V a r r a b l er e s i s l o r 0 k ( B A S S )
ACT-135
V i l n a b l er e s i s t o 1r 0 k ( T B E B L E )
AcT-136
L e v e rs w i t c h { N 4 O D E L
, OW FILTER)
A S K . , ]5 2
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V a r i a b l er e s i s t o r1 M { E A L A N C E )
ACT.021
R e m o i e l e v e rs w i t c h ( T A P E M O N I T O R I
ASX-128
l
RearPanel
T e r m i n a l( A M S T E R E OO U T ) -
A K8 . 0 7 6
e r m i n a l { l N P U I , P F I EA M P O U T , P O W E F A M P l N }
AK8{63
B a r J n t e n n a i l s s e n r b l YATB.624
S l i c i es w r t c hi D E - E M P H A S I S i
ASH.O15
e r m i n a l ( S P E A K EB S )
AKE.O54
socket(AC OUTLETS)
AAC
'AKP-O42
T e r m r r t a(lA N T E N N A ) - AKA.013
T P r r r r r ; r( lT A P E1. 2 ) AK 8"063
--
.ii\AC power cord
ADG.O23
1 7
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P.C.BOARDCONNECTION
DIAGRAM
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The counter IC (PD50A
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the grade of the FM ce
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match the counter IC (PI
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haue been arranged accor
mic filter Fl - F3 (color
in the following table.
SWITCHAss'y
GWS-224
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ng pin nos. 3 & 4 of PD5009)
assembly (AWM-227) may thus
e circuit diagram, depending upon
ceramic filters Fl - F3 (diuided
to IF offset ualue).
rsisfors in the equalizer assembly
the program circuits employed to
(PD5O09 located in the indicator
V IF offset ualue. These jumpers
:cording to the grade of FM cerailor coded into 3 ranhs) as shoutn
Ass'y
TONECONTROL
GWG-r41
AWM-227
RzS12.2al
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NOTE:
The indicated semicondu ctors are representative ones
only. Other alternatiue semiconductors moy be used and
are listed in the parts list.
SFf'IGR
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Top View
Speakerterminal assembly
GWS-222
t
IFuse 64
E q u a l i z e ra s s e m b l y
AWM-227
AEK.109
I
t
,,\Power transformer
*ATT-677
Power supply assemblY
GWR.122
Tuner assembly
GWE.133
(4.7/10W)
$ Resistor
ACN-1 5
;
;
;
FL indicator assembly
AWV-OO9
PoweramPlifierassemblY
GWH.139
BottomView
I
P o w e ra m p l i fi e r a s s e m b l y
GWH.139
, l *
Tuner assembly
GWE.133
r*l
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GWR.122
t
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H e a d p h o n e sj a c k a s s e m b l y
GWK-146
Tone control assembly
GWG-141
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SX-3EIOO
7. DIAL CORDSTRINGING
1. Remove the bonnet case and front panel as
described in the'oDisassembly,'section on
page 16.
2. Remove the tuning drum from the shaft of the
tuning capacitor.
3. Tie one end of the cord to the stud$located
insidethe tuning drum.
4. Rotate the tuning capacitor right around until
the rotor bladesare fully intermeshed.
5. Secure the tuning drum back onto the tuning
capacitor shaft, making sure that the securing
screw@facesdirectly upward.
6. Passthe cord out through the small opening in
the circumference of the tuning drum (see
diagram), and then take it over pulleys A, B,
C, D, and E in that sequence.
?. Wind the cord around the dial shaft B times.
8. Pass it over pulley F, wind it around the tuning drum 2 times, and finally tie it to the
springhook@so that it is tensioned.
9. Turn the dial shaft, and check that the cord
movessmoothly.
10. Cut off any excesscord.
1,1.Tum the dial shaft counter-clockwise as far
as it will go.
12. Align the dial pointer with the starting point
of the dial scale,and then passthe cord over it.
13. Check that the dial pointer is in line with the
starting point of the dial scale.
14. Finally apply the locking paint to the cord
securing positions (stud O and spring hook$)
and the dial pointer connection.
T u n i n gd r u m
Di a ls h a f t
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S t a r t i n gp o i n t
D i a lp o i n t e r
Dial pointer
t
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8. ADJUSTMENTS
8 . 1 F MT U N E R
FM Tracking
r Connectthe SIGNAL meter or DC voltmeter
betweenR100 (no.? pin of Q8) on the tuner
assemblyand ground.
r The tuning coil in the RF amplifier circuit does
not have an adjusting core. Consequently,
tracking adjustment at 90MHz are performed by
regulating the gap between rotor and stator of
the tuning capacitor (VC3). The expression
"adjust VC" found in the
text means that
the two outer rotor blades of each of these tuning capacitors are to be extended outwards with
spatula(Part No.GGK-066)asshown in Fig.8-1.
Botor blacle
SpatuIa
( G GK . 0 6 6 )
f i e 1 6 1g l s d s -
arrrrTl!
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U'LIFIP
/nllnll
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X
X
F i g . 8 - 1 A d j u s t m e n to f t u n i n g c a p a c i t o r
1 . Set up the test equipment as Fig.8-2.
2 . Set the FM MUTING switch to OFF, and
FUNCTION switch to FM.
iJ.
Tune the SX-3800dial pointer to 106MHz. and
set the FM SC (FM signal generator) output
frequency to 106MHz, output level to 60d8,
modulation frequency 400H2, frequency deviation 75kHz (100Vomodulation).
Adjust the TC1 (OSC trimmer) to obtain maximum deflection of the signalmeter.
5 . Then tune the dial pointer to 90MHz, and set
the FM SG output frequency to 90MHz.
6 . Adjust the core of L8 (OSC coil) to obtain
maximum deflection of the signalmeter.
q
, . RepeatstepsS-6above.
8. Set the FM SG output level to 20 - 30d8, and
adjust TCz (ANT trimmer) and TC3 (RF trimmer) at L06MHz, and L2 (ANT coil) and VCB
(RF tuning capacitor) at 90MHz in the same
manner as described above in steps 3 - ?.
These adjustments will ensure optimum sensitivity in the 90MHz - 106MHz range, and
minimum difference in sensitivity between the
two extreme frequencies.
9. Retune the dial pointer to a position with no
input signal.
10. Adjust the N core of T2 so that the voltage
betweenno. 8 and no.9 terminalson the tuner
assemblyis reduced to DC 0V.
11. Set the FM SG output level to 60dB and output frequency to 9BMHz, and fine tune the
SX-3800to this position.
12. Then rotate the D core of "t2 to obtain minimum distortion in the demodulated output
(REC terminal)to minimum.
13. Repeat steps g - 12 above until both requirements are satisfied.
1.4.Resetthe step 11"again.
15. Adjust the VR2 so that the 5-point SIGNAL
indicator reads5.
16. Set the FM SG output level to 20d8, and turn
the FM MUTING switch to ON.
L7. Adjust the VR1 to the point where the mutins
is operated.
Multiplex Decoder
I Connect the MPX SG (FM multiplex generator)
to the extemal modulator terminals of FNI SG,
thereby using FM SG as extemal modulation.
1. Set the FM SG output frequency to gBIVIHz,
output level to 60dB (unmodulated),and tune
the SX-3800to this frequency.
2. Adjust the VRb to obtain a 76kWz signai at
no.7 terminal on the tuner assembly.
3. Set the MPX SG modulation output to pilot
signal (19kHz) only, and set the FM deviation
of ?.5kHz (107cmodulation).
4. Adjust the VR4 to obtain minimum leakageof
the 19kHz pilot signalat the REC terminal.
5. Raisethe FM SG output level to 80d8, and set
the MPX SG to Main lkHz (L+R), 6?.5kHz
deviation (907o modulation), and pilot signal
to 7.5kHz deviation(107omodulation).
6. Adjust the T1 core to within tg0" to obtain
minimum distortion in the dernodulated output (REC terminal).
t
t
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Crystal Detector
1. Set the FIvl SG output frequency to 98MHz
output level to 60dB (unmodulated),and tune
the SX-3800 to this frequency.
2. Adjust the B core of T201 so that the voltage
between no.10 terminal of the tuner assembly
and groundis reducedto DC 0V (t300mV).
3. Set the FM SG output level to 60dB, modulation frequency 400H2, frequency deviation
7 SkHz (100V.m odulation).
4. Adjust the A core of T201 to obtain maximum
AC voltage reading between no.L0 terminal
of the tuner assemblyand ground.
t
T
T
AC voltmeter
Distortionmeter
T o R E Ct e r m i n a l
Oscilloscope
T
t
M P X s i g n agl e n e r a t o r
r
t
I
t
r
I
tI
F M s i g n a lg e n e r a t o r
C o n n e cS
t I G N A Lm e t e ro r D C v o l t m e t e r
To FM 300n ANT
terminals
I N ( E X T .M O D }
Fis.8.2
I
8.2 AM TUNER
1. Set up the test equipment as Fig. 8-3.
2. Set the FUNCTION switch to AM.
3. Tune the SX-3800's dial pointer to 600kHz,
and the AM SG (AM signal generator) output
frequency to 600kHz, modulation frequency
of 400H2, 30% modulated and output level
of 30dB- 100d8.
4. Adjust the core of T3 to obtain maximum output level (REC terminal).
5. Then tune to 1400kHz and alsoset the AM SG
output frequency to 1400kH2.
6. This time adjust TC5 to obtain maximum output level (REC terminal).
?. Repeat steps3 - 6 above.
I
8. Set the AIvf SG output level to about 30d8,
adjust the coil along the bar antenna and T3 at
600kHz, and TC4 and TCb at 1400kH2, in
the same manner as described in the above
steps. This is the adjustment for optimum
sensitivity across the frequency band, and
minimum difference in sensitivity at different
frequencies.
9. Reset the AM SG output frequency to
1400kH2, and also tune the SX-3800 to this
frequency.
10. Adjust the cores of T4 and F7 to obtain maximum output level (REC terminal).
t
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AC voltmeter
T o R E Ct e r m i n a l
B a r a n t e n n ac o i l
To AM ANT
terminal
A M s i g n a lg e n e r a t o r
i
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1kfl resistor
Fi s . 8 - 3
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8 , 3 P O W E RA M P L I F I E R
'I'urn VR3,
VRb (L) and VR4, VR6 (R) fulty
around in the counter-clockwise
direction,but set
VR1(L) and VR2 (R) to the centerpositions.Without any load or input signal, turn the POWER
switchON.
T
DC Balance
1. Adjust VR1(L) for 0V (to within t30mV) between terminal no.23 and ground.
2. Adjust VR2 (R) for 0V (to within t30mV) between terminal no.22 and ground.
H
T
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T
T
^ \' ,fJaJtuL6 t|
h.,r,z--"{*( (_nry'l)
aFosc,lt ,- d
ldle Current
1. ;\djusl VRB (L) for 120mV between terminals
n o , 2 8 ( + )a n d n o . 2 5 ( - ) .
2. Adjust VR4(R) for 120mV between terminals
n o . 1 7 ( + )a n d n o . 2 0 ( * ) .
3. Adjust VR5(L) for 150nrV between terminals
n o . 2 8a n d n o . 2 5 .
4 . A d j u s t V R 6 ( R ) f o r 1 5 0 m V between terminals
n o . 1 ?a n d n o . 2 0 .
o,--"
J Pos* r.r# +t*<r'.-'U(
{-n"Li,^.g^.
r
r
\ ,v\
u t * j , t , te
;,t; .-1.*.1.
t-r(2t
R
t\
V R 6I I
ltl
@U
I u*oll
:
II
t
t
I
n
P ** i+> u t {,-Lr-
/.o.'J ?oir, ** Q(s,)
I
t
t
/o.n 4. ?,^. or ^aA.f
ku
H
FI
I
,*o,-,{' "*.u {
I
I U
{a)
N o . 17
R
No.20
{I))}
VR2
i
llL
I
l[
Itt-
Ib
No.22
No.23
VR1
*.
I
-_L
t f |
vR3ll
@n
No.25
t*
No.28
| | l
vR5ll
>'
)6f
t!
I
Poweramplifier
assembly
Fis.8-4
e3
8 . 4 F L I N D I C A T O RC I R C U I T
FrequencyDisplayCircuit
o The counter IC (PD5009) has been designedto
match FM ceramic filter IF offset (caused by
displacementof the central frequency) by combination of the inputs (of H or L level) applied
to pin nos.3 & 4. The matching IF offset in the
SX-3800 is determined according to the combinations of connections and disconnections
between the R 28 and R 28 resistors in the
equalizer assembly (AWM-22?). Check that the
combinations shown in the table below have
followed for the conesponding grades of FM
ceramicfilters F1 - F3 (3 ranks - color coded).
F M c e r a m i cf i l t e r
{F1-F3}
PD5009
AVtM-227
R28(2.2n1 829(2.2n)
Pin no.3
Pin no.4
Red
L
H
Cut
Connect
Bl u e
H
H
Cut
Cut
Orange
H
L
Connect
Cut
H=5.5V,
Output PowerIndicatorCalibration
1. Apply a l"kHz signal to the POWER AMP IN
terminals.
2. Adjusi the level of this input signalso that the
voltage on the output terminals (SPEAKERS)
read 8.95V (AC).
3. Adjust VR1(L) and VR2(R) so that the output power indicator read L0 watts.
L:OV
If the SX-3800 frequency display reads
97.95MH2 or 98.05MH2 when a 9B.00MHz
signal is applied to the receivet, adjust TCl so
that the display reads 98.00MH2 correctly.
If an accurate 9B.00MHz input signal source is
not available, tune the receiver to the nearest
known broadcasting station in the 98MHz re'
gion, and check that the station's frequency is
correctly displayed,adjusting TCl if necessary.
F L i n d i c a t oar s s e m b l y
vR2*€) @_vnr
F i g .8 - 5
I
I
I
Eix-3Elclcl
I
t
9. EXPLODEDVIEW
ExteriorComponents
t
I
I
I
I
I
I
I
I
I
I
I
t
('
I
.."i,
11
Key No.
t -
2.
3.
4.
7.
I
I
I
I
I
6q
Part No.
DCK4OPl50FZK
Eonnet case
AMM.086
VBZ3OPOSOFMC
Front panel assembly
ANB.851
Lever knob
AAD.139
AAB.24O
AAB-239
NKgOUC
wA92F 140U100
lo.
1't.
't2.
13.
14.
Knob
Knob
Hood
AAA-066
AAD.227
AAD.226
Knob
Push knob B
Push knob A
Bottom plate
VBZ3OPOSOFMC
16.
17.
AEC-178
VTZ4OPlzOFMC
Foot assembly
25
BOO
Interior Components
NOfES:
I
r Ports witltout part number cannot be supplied.
t The A marh found on some component parts indicatee the importance of the
safetl factor of the part. I'herefore, when replacing, be sure to use parts of identical
designation.
Key No.
Part No.
1.
2.
3.
4.
5.
VBZ30P060FMC
6.
7.
8.
9.
PMZ30P060FMC
li
n
16,
17.
't8.
'19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
3 1.
32.
33.
34.
35.
Dial panel assembly
e6
51.
52.
53.
,.|\ 54.
55.
A
56.
57.
58.
59.
60.
Side frame L
wA92F140U100
NKgOFUC
GWK-l46
ACG-001
ASK-507
Shaft cover A
Headphones jack assembly
Ceramic capacitor {0.01 /25OVl
Lever switch (POWERI
A
t'
6 1.
62.
63.
64.
65.
GWG-I41
Switch assembly
Switch assembly
Lamp with wire (BV, SOmA)
Remote wire
Tone control assembly
66.
67.
68.
69.
70.
ASX-128
AEL-069
AEL-095
Gws-226
Remote wire
Remote lever switch
Lamp with wire (8V, 50mAl
Lamp with wire (8V, 50mA)
Switch assembly
t:,72.
73.
74.
75.
GWS-223
GWS-224
AEL-047
Panel frame
Spacer A
BBT3OPOSOFZK
PMT3OPO6OFZK
Spacer B
37.
38.
39.
40.
ABN-050
A8E-001
8BT30P060FZK
41 t
42.
AEL{29
AKK{05
Mounting plate
Union nut
lnternal toothed lock washer
Acrylic board
1,43. AcN-lrs
25
Smoother
Dial pointer
Fuse6A
AWV{09
AEL-075
Lamp lwedge type 8V, 300mA!
Lamp sockst
Resistor (4.7/lOtfVl
F L indicator assemblv
Lamp with wire (8V, 50mAl
Part No.
46.
47.
48.
49.
50.
VBZ4OPOBOFMC
Fuseholder
AKR-O32
Lamp with wire (BV, 50mA)
AEL-O65
JO-
M.
45.
Key No,
Pulley assembly
Pulley assembly {smalll
Dial scale holder L
Side plate
A ro. AEK-rog
11,
1?.
13.
14.
15.
Doscripiion
71.
Elescription
Lamp holder
Dial scale holder R
Capacitor holder
Ground terminal 2P
Center channel
GWE-133
4TT-677
AKP-042
AXA-264
GWS-222
AEK-102
AEK-106
AEC-327
MTX3OPlOOFZK
8BZ30POB0FZK
Tuner assembly
Shield plate
Center frame
Power transformer
AC socket {AC OUTLETS}
Dial shalt assembly
Transformer holder
Tuning drum assembly
Ground frame
Side frame (Rl
Raer panel
S p e a k e rt e r m i n a l a s s e m b l y
Fuse 2.5A
FuselA
Heat sink block
Heat sink holder
Rod
Strain reliel
A B A - 17 6
ADG-023
AT8-624
Screw 3x1 Ox9R
AC power cord
B a r - a n t e n n aa s s e m b l y
Terminal(GNDI
GWS-226
Switch assembly
AK8-076
Terminal (AM STEREO OUTI
EO holder A
E q u a l i z e ra s s e m b l y
EO holder B
76.
77.
78.
79.
80.
wA35F100N080
8't.
AKM-004
AWM-227
Jumper plug
'{qr
&
29
ae*-\
{{
r,utb "p
37
228
SX.SClO(l
8l
/l
&
fr-r r
Y
?T
s
{'
m\
71
I
l
Heat Sink Block
I
1
I
\
-hr-.
)Jl
I
*|.-Y
t
l '
12
I
,
.
'
I
I
I
I
t-------4
l
I
)
Part No.
Description
1.
2.
3.
4.
VBZ30P060FMC
GWR-I22
V M H 3 O P 12 O F M C
Power supply assembly
5.
2SC2525-G
( 2 S C 2 5 2 5 - B)
6.
2SA1075-G
( 2 5 A 1 0 7 s - B)
Key No.
Socket stopper
Power transistor
Power transistor
h f e o f 2 S C 2 5 2 5a n d 2 S A 10 7 5 s h o u l d h a v eo f s a m er a n x
7.
8.
9.
10.
AEC-488
V8Z30P080FMC
I n s u l a t o rw a f e r
STV2H
AKH-010
Varistor
T r a n s i s t o rs o c k e t
H e a ts i n k
GWH-139
P.A.holder
P o w e r a m p l i fi e r a s s e m b l y
1 O .S C H E M A T I CD I A G R A M S ,P . C . B O A R D C O N N E C T I O N
DIAGRAM AND PARTS LIST
2SC461
2SC535
External Appearanceof Transistorsand lcs
HA12010
HA1197
<>-_
TyeeNo
t--
"tt([nnnnt'
-)
Lot No
l " ' ?
2SA979
lvoc
Lot
@
n,.'->ft*/
illl\
gl ] \
c u
No\
Typc No
Nol
zSC1906
HA1201
NJtt44558DV
Typ. No \
5
A
.nn'l\
ru#
Lot No -
2SA750
2SC1400
2SC945A
Type No
2SD313
TA7318P.A
9
l li l , r n n , l
llllll/,/,IllllJ,
."t*;;i]!.Usr
-Lot
2SA904A
2SC1914A
Sull'r
t
2SA733A
2SC1775A
{
A
..'*" fil.l
h'F
Type No
Type No -.-
\"?
1/lt\\
l l
u
c
2SA905
2SC1915
No
rYoe
qlnj
2SA985
2*2275
.
PA3007-A
u
- Type No
r!\
2S8682
si
N
ffi'--::.""
r
su,,
tr=J/t
)hl
Jlt\
illt\
B v
c
Lot No - .-
No
rvpe
No
A)
l-,. a
zsKt68
"-j
rvpcNo-
u[l ..,."w
Lo'lNo
T#
^"
PA4006-A
25C2291
Typa
No
Lot
No
-
3SK73
Type No--.
H412017P
PO5009
l
ts
I
I
t
I
T
T
I
f
tI
I
I
t
1 0 , 3 P A R T SL I S T
.vo?'fs:
c ll'hen ordering resisiot's,first conuert resistanceualuesinto code lbrnt as slrorun irr
tht, fo Llou irtg e.tantples.
L'r 1 llhen there are 2 effectiue digits (any digit aparl from 0), suchas 560 ctltnr
a n d ' ! 7 h o h m l t o l e r a n c ei s s h o r a nb y J = 5 % a n d K = 1 0 9 t ) .
5(i x I0'
,i6I
560s|
RDt/tPS
Hs]mJ
- 1 7x l U t
47h\I
4 7 : J. .
RDYEPS
EilIZEJ
()R.5
r/5!)
B.\'2H ElEm /(
| ( l
oI0
/rs/P @[]Q 1''
E x . 2 l f h e n llrere are 3 eff<:ctit,edigits (such as in high precisionnrelalfilnt rasisl o r s) .
i;62hl}
562 x 101
5 6 2I
a N , , 4 SEa6 n m r
I'lte ,'!, rrtarh fourtd on sotne contponent parts indicates the importance of lhe
saf'ety factor of the parl.'l'herefore, whert replacinq, be s.rre to use parls of
id en t i caI clesignaI io n.
Parts
Miscellaneous
Part No.
ELECTRO.PARTS
Part No.
f- nrrezZ
ATB.624
AELO29
AE1.069
A EL { 9 5
A EL { 4 7
AEL{75
A E1.065
,'i',Re r-t 09
,i:ner-too
A aer-roz
Symbol & Description
T1
T2
Power trans{ormer
B a r - a n t e n n aa s s e m b l y
PL1-PL3
L a m p ( w e d g et y p e )
PL4,PL6, PL7 Lampwilh wire
PLs
Lampwith wire (8V, 50mA)
PL8,PLg
Lampwith wire (8V,50mAl
PL10
PLl 1
FUl
FU2,FU3
FU4
ll: 2sc2525-G'
(2SC2525"8')
. A2 s A 1 o 7 b - c "
( 2 S A 1 0 7 5- -) B
O1, 02
I nsr.soz
i .n c c o o r
j,ecruozs
sl
ACN.1
r5
l i _A D G - 0 2 3
R2
Lampwith wire {8V, 50mA}
Lamp w;th wire (8V, 50mA)
F u s e( 6 4 )
F u s e( 1 A )
F u s e( 1 . 5 A )
0 3 ,e 4
' h f e o f O 1 * O 4 s h o u l dh a v et h e s a m er a n k
i'erp.oaz
L e v e rs w i t c h ( P O W E R )
C e r a m i ec a p a c i t o r ( 0 . 0 1/ 2 5 0 V 1
R e s i s t o r{ 2 . 2 M )
R e s i s t o r( 4 . 7 1 1 0 W )
AC power cord
AC socket (AC OUTLETS)
AKR.O32
AKB.076
F u s eh o l d e r
T e r m i n a l( A M S T E R E O O U T )
cr
n t
C E Al O O M5 0 L
B O A R DA S S E M B L I E S
No.
D6scription
GWE.133
AWS.146
G W H -319
GWR.122
GWS-226
Tunerassembly
Switch assembly
P o w e ra m p l i fi e r a s s e m b l y
Power supply assembly
Switch assembly
GWX463
GWG-14'I
Detectorassembly
Tonecontrolassembly
Symbol & Description
GWS-224
AWM-227
GWS-222
Switch assembly
E q u a l i z e ra s s e m b l y
S p e a k e rt e r m i n a l a s s e m b l y
GWS.223
GWK.146
AWV-OO9
Switch assembly
H e a d p h o n e si a c k a s s e m b l y
F L indicator assembly
TunerAssembly( G W E - 1 3 3 )
CAPACITORS
Part No,
Symbol & Description
ACK-035
ACM-006
Tnr
ccDcH 070D 50
ccDcH 010c50
ccDcH 040c 50
ccDcH 120J50
ccDcH 150J50
c50
cl6
cI4
c 11
c21
ccDcH 330J50
ACG-01
I
CCDLHOBOD50
c c o R H 1 5 0 J5 0
ccDUJ 120J50
c20
c52
cl9
c17
CCDXLOBOD
50
ccDsL 390J50
c c D s L 1 0 1 J5 0
c c D S L 1 5 1 J5 0
C K D Y B1 O z K5 0
c89
c75
c24, C49
c 3 4 , C 3 5 ,C 3 0 1 ,C 3 0 2
c 8 2 , C 9 1 ,C 15
CKDYB.I22K
50
C K D Y F1 0 3 25 0
c99
c2, c5-Q7, C13,C22.C23,C25,C32,
c38, C41,C42,C44,C45.C8r
c B 6 ,C B 7 ,C 9 0 ,C 9 2 - C 9 5 ,C l 0 1 , C 1 0 8
c9, cl0, c26-c29, C31,C37,C39,C40,
c46, C47,C48,C14
C K D Y F 1 O 3 Z5 0
C K D Y F4 7 3 2 5 0
CKDYF 4732 5A
CGBH6BK5OO
rr I
Tuningcapacitor
Trimmer
Ceramic (390P/50V)
nQ
c 9 6 ,C l 0 0 ,C l 0 7
al a
t
Part No.
Symbol & Description
C K D Y F1 0 3 25 0
C Q M A1 5 3 K5 0
coMA 473J50
c o s H 3 3 1 J5 0
cosH 152J50
C E A N LR 2 2 M5 0
C E A N LO l O M5 0
C E A N L2 R 2 M5 0
coMA 153K 50
C E AO l O Ms O L
C E A3 R 3 M5 0 L
C E A4 R 7 M5 0 L
C E A l O O Ms O L
Part No,
uco
?141
ATF-106r
ATF,OB9
ATF.1O5
ATF.O38
c53
c55, C57
nlna
SEMICONDUCTORS
c 6 5 ,C 6 6 C
, 7 0C
, 71
c63,C64
Part No.
c303,c304
?14
c 7 9 ,C g B
c97
c33,C43,C69
cB0
c30,c76,c77
c36,CB3,C84
c12
C E A3 3 1 M1 O L
C E A4 7 1 M1 6 L
C E A4 7 O M2 5 L
c54
c 5 1, c 8 5
c3, c4, c78
N o l e : llhen orderingresrsfom,
conuertthe
Part No.
R D % P MN N N J
RD%PMt]NrJ J
RD/1PMLINN J
i j R D % P M Fn n n J
RN%SOnnlrn F
FM
FM
AM
AM
c e r a m i cf i t t e r
l o w - p a s sf i t t e r
c e r a m i cf i r r e r
455kHz f ilter
t
35K73
2SK34
2SK168
zSC1906
2SA535-A
o1
02
0 3 , o 15
o4
HA120'l
NJM4558DV
PA3007-A
PA4006-A
HA',l197
06, 07, 09
O8
010
011
o12
zSC1919
2SC2575
{2SC945A)
2 S A 11 0 0
(25A733A)
nra
014,016-021 ,Q24*A26
o22,423, O2B-O35
H A 12 0 10
Symbol & Description
MZ-061
(wz-0611
Dl, 02
tDt535
D 3 ,D s * D 1 7
{'152473','
1SV69-03
D18
R1-R11R
, r 3 ,R 1 5 - F 1 9 , R 2, 1R 2 2 ,
R24-n29, R31-R45
R 4 7 - R 5 3 ,R 5 6 - R 5 9 ,R 6 1 ,R 6 3 .R 6 5 ,
R 6 7 - R 9 9 ,F 1 0 1 - R 1 2 5
R 1 2 8 * 8 1 4 0R
. 301-R316
OTHERS
FI1?
Part No.
R'N
R46,R126
T
Symbol & Description
resistanceualueinto codeform, and
then rewrite tlzepart no. as before.
t
t
t
t
;
t
t
Symbol & Description
R30
c92-048
c92-049
ACP-056
ACP-055
ACV-18'l
VR1
VR2
VR4
VR5
VR6
S e m i - f i x e d4 7 k
S e m i - f i x e d1 0 k
S e m i - fi x e d 2 2 k
S e m i J i x e d6 . B k
V a r i a b l e1 0 0 k ( V O L U M E )
ACT-021
VR7
V a r i a b l e1 M ( B A L A N C E )
ASX-130
A S K - r5 2
AKA.O13
AKB-063
T R A N S F O R M E RCSO, I L SA N D F I L T E B S
9vlrrl &
Description
ATE.OOS
ATE.045
ATB-063
ATB-069
T1
T2
ATC"097
T24"O28
L2
F M a n t e n n ac o i l
L3,L7, L9-L13, L15
Arc-o72
L8
I J
T4
FM
FM
AM
AM
IFT
DET transformer
OSCcoil
lF coil
t
RF coil
F M O S Cc o i l
s 1 ,s 2
s3,s4
R e m o t e l e v e rs w r t c h( T A o E )
L e v e rs w i t c h ( M U T I N G ,
LOUDNESS)
T e r m i n a {l A N T E N N A }
T e r m i n a l( T A P E )
Precautions
t
PartNo.
F1-F3
F4, FS
F6
F7
voo
C E A 2 2 O M2 5 L
C E A4 7 O M1 O L
c E A 1 0 1 Mt 0 L
C E Al O I M 2 5 L
C E A2 2 1 M1 6 L
RESISTORS
I
Symbol & Description
The FIqIceramic filters (ATF.106, symbol nos.Ft - F'3)
in the tuner assembly (GWE.j3J) hos been selected on
the basis of their respective IF offset ualues (the degree
of displacement from the center lF). Filters are graded.
into 3 ranhs, these being identified b5' color coding nt
the top (red, orange, and. blue). When replacing filters,
always use filterc of the same color code.
When placing arder$ for these filters, designate the grad,e
(color) as well as the part no.
T h e c r y s t a l r e s o n a t o r ( A S S - 0 1 2 ,s y n t b o l n o . X l ) i n l h e
detector assembly (G\VX-463) is auailable in 3 different
types coffespanding to the IF offset ualues of the Ittrf
ceramic filters (ATF-L06, symbol nos.F.l -F3) in the
tuner assembly (GWE-133). These may be identified by
the different colored dots (red, blue, orange) at the
head. When replacing crystal resonators,chech lhat the
color is some as the ceramic filters.
;
il
t
t
t
ilI
t
4A
;
six-gaoo
Detector Assembly{GWX-463}
OTHERS
CAPACITORS
Part No,
Part No
Symbol & Description
c c D s l 1 0 1 J5 0
ccDWK150K50
c201
C202
CKDYB 471K 50
CKDYF 103250
C204
C206
Symbol & Descriprion
S1
ASG-231
AKB.063
P u s hs w i t c ht F U N C T I O N I
T e r m i n a(ll N P U T l
ToneControlAssemblytGW G- 1 41)
CAPACITORS
RESISTORS
llhen ordering resrsfors,conuert the
resistanceualue into code form, and
then rewrite the part no, as before.
Part No.
Symbol& Description
No fe
RD%PM ilillr J
R2 0 1- R 2 0 8
SEMICONDUCTORS
Part No.
2SC461-B
2-1K261
Symbol & Description
o201
D201, D202
OTH ERS
Pari No.
Part No.
lynlgt9 9:*:ie{9!
ccDsL 470K 50
c c D s L 1 0 1 K5 0
C K D Y B4 7 1K 5 0
coMA 332K 50
coMA 273K 50
c3, c4
c5, c6, c9, c10
cl1,Cl2
c23, C24
cI9, C20
C W A N LR 3 3 M5 0
C E A N LR 2 2 M5 0
C E A N LO .O
I M5 0
C E A N Ll O O M5 0
C E A N L4 F I 7 M5 0
c21 , C22
c 1 5 .C 1 6
c17, C't8, C25,C26
c27 , C28, C33,C34
CEA 47OM5OL
C E A4 7 O M2 5 L
C E A1 O 1 M1 O L
c29-C32
c 1 3 ,C 1 4
c7, c8
Symbcl & Dascription
Note:
ASS-012*
ATE.O50
vt,wz
X1
T201
Crystalresonator
FM detector transformer
RESISTORS
When ordering resistors,convert the
resistance ualue into code form, and
then rewrite the part no. at before.
Part No.
Symbol& Description
EqualizerAssemblylAwM-227l.
RD/4PM NNN J
R 1- 8 4 0
ACT-135
ACT.136
VR1
VR2
CAPACITORS
Part No.
c c D s L 4 7 0 K5 0
c c D s L 1 0 t K5 0
C K D Y B4 7 1K 5 0
C O M A1 2 2 J5 0
C O M A1 B 3 J5 0
c K D Y F 1 0 3 25 0
coMA 683J50
C E A N L4 R 7 M5 0
C E A4 7 O Ms O L
C F A4 7 1M 6 L
C K D Y F4 7 3 25 0
No fe.
Symbol & D€scription
c7, c8
c 5 , c 6 , c 1 7 ,C l B
c 1 9 .C 2 0
c 13 , C 1 4
\.t t.utz
c25
c l 5 ,c 1 6
c3, c4, c23,C24
cl , c2, c21,c21, c22
c 9 ,c r 0
SEMICONDUCTORS
PartNo.
H A I 2 0 17 P
Symbol & Description
o1,02
OTHERS
Part No,
Symbol & Description
LZO
RESISTORS
When ordering reslsfors, convert the
resistonceualue into code form, and
then rewrite the part no. as before.
Parl No.
Symbol& Description
A S K - 15 2
R 1 - R 6 , R 1 1 , R 1 2 , R 1 5 - R 2 6 ,R 2 8 , R 2 9
R7-R10, R13,Fr14
s 1 ,s 2
L e v e rs w i t c h { M O D E ,
LOW FILTERI
SwitchAssembly(AWS-146)
Part No.
R D % P MC N N J
R N % P O | : ] T J N NF
RS2Pnllr J
V a r i a b l e1 0 k { B A S S )
V a r i a b l e1 0 k ( T R E B L E )
coMA 332J50
A S H - 051
Symbol & Dgscription
c't, c2
q1
S l i d es w i t c h { D E - E M P H A S I S )
,
SEMICONDUCTOBS
Part No,
H A 12 0 17 P
1S 15 5 5
Symbol & Description
Dl, D2
SwitchAssembly(GWS-226)
Part No,
ASG-230
Symbol & Description
s5
P u s hs w i t c h ( F M M U T I N G )
43
(GWH-139)
PowerAmplifierAssembly
CAPACITORS
Part No.
Symbol & Delcription
c o M A 1 0 3 K5 0
c o M A 8 2 3 K5 0
c o M A 3 3 2 K2 5 0
c c D s L 1 0 1 K5 0 0
c c D s L 3 9 0 K5 0
Cl17-C120
C l 3 1 ,C l 3 2
C 11 3 ,C t 1 4
C121-C124
c 1 11 . C l , l2
c c D s L 4 7 0 K5 0
c c D s l 2 2 1K 5 0
C E A N L4 R 7 M5 0 L
C E A N PR 2 2 Ms 0
c E A 4 7 1 M6 L
C 1 0 5 - C l1 0
C 1 0 3 ,C l 0 4
C l 0 1 ,C 1 0 2
C 1 2 5 ,C 1 2 6
Cl33
c E A 1 0 1 M2 5 L
ACG{09
C't34
Note:
RESfSTORS
Part No.
C 1 2 7- C 1 3 0 C e r a m i c ( 0 . 0 4 7 i 1S O V )
\fhen ord.ering resisfors, eonuert the
resistance ualue into code form, and
then rewritetlrc partno. as before
Symbol & Description
R D % P Mo n n J
R 1 0 1 - R 1 0 8 ,R l 1 1 , R 1 1 2 ,R 1 1 5 R 1 1 6
R D % Pn
Mn n J
R 1 1 9R, 1 2 0R. 1 2 5R, l 2 6 n, r a S , ' n r a j '
R 1 4 9 - R 1 5R
2 ,1 5 7R. l 5 8 ,R 1 6 9R, l 7 2 ,
R 1 7 7 - R 1 8 1 ,R l 8 4 - R 1 8 6
Part No,
2SCr400
2SA905
2SA904A
2SC'1914A
2SC2575
2SCl384
o't29-o133
o134
MZ-061
(wz-061)
STV2H
10 E 2
1S1555
(152076)
D101-Dl06
1S2471
MZ-150
(wz-150)
o 12 3 - D 1 2 5 , D 1 2 8
parN
t o.
a R D % P M FE D f i J
RD%PS
DilN J
R153-R156R
, 159_R164
F 1 4 3 ,R 1 4 4
,{ ncru-tra
nr21, R12z
R 1 7 3 ,R 1 7 4
R 1 7 5 ,R 1 7 6
Part No.
ACP-062
ACP-o19
ACP-o10
VR1, VR2
VR3, VR4
VR5, VR6
S e m i - ifx e d 3 3 0 k
S e m i - f i x e d1 0 0
S e m i - ifx e d 1 0 0 k
SEMICONDUCTORS
Symbol & Oescription
O 1 0 10
, 102
2SC1775A"E( 2 S C17 7 s A - F ' )
0 1 0 3 ,0 1 0 4
2SA979-F'
.)
(25A979-G
* h f eo f O 1 0 1a n dQ 1 0 2s h o u l dh a v et h e E - r a n ki.f O 1 0 3 ,a n d
O 1 O 4h a v et h e F - r a n k .
' h f e o f O 1 0 1a n dQ 1 0 2s h o u l dh a v et h e F " r a n ki,f 0 1 0 3 a n d
0 1 0 4 h a v et h e G " r a n k .
44
9yqlglt o"*lelgl
RLl
0 1 0 5 ,0 1 0 6
0 1 0 7 ,0 1 0 8
0 1 0 9 ,0 1 1 0
0 1 11 . Q 112 , 0 1 1 7 ,0 1 1 8
T
I
t
I
I
I
Relav
PowerSupply Assembly(GWR-j22)
R 1 6 5 ,R 1 6 7
T h 1 0 1 ,T h 1 0 2
2SC2291
2SA750
{2SA726S}
2SC1915
2SA750
vtzo
CAPACITOBS
TH103-2
Part No.
D 1 0 9D, 1 1 0
D111.D112,D117,D118
D1l3-D116
oTHERS
R109,R110,R113,R1.t4,R117,R118,
ASR-067
R 1 2 3 ,R 1 2 4 ,A 1 2 7 - R 1 4 2 , 8 1 4 7R
, 148
pizsopooorrvlc
R N , I HN N D K
R S 2 PI ] C N J
o l 1 3 ,o 1 1 4 , A 1 1 9 , A 1 2 0
0 1 I 5 ,0 1 1 6
4121 , Q122
0123,4124
O 1 2 5 .O l 2 6
a 2SC2275-O'
12sc2275.P'l
0 1 2 7 ,0 1 2 8
f]2SA985.O*
(2SA985"P')
*hfe of Q125-01 28 shouldhavethe samerank
ARD%PMFnnnJ
;! Roz,rsrnnn .t
Symbol & Descriprion
H
H
t
$l-o-! lQeryrlqlon
cEA 100M50L
c E A 4 7 0 M5 0 L
c E A 2 2 ' l M1 6 L
c E A 2 2 1 P8 0
cEA 470M 50L
C206,C227
C 2 0 9 ,C 2 1 0
C217
C202,C203
C207,C20a
cEA471l!416L
c E A 1 0 2 M3 5 1
c E A 1 0 1 M2 5 L
c E A 4 7 0 M1 0 L
c E A 4 7 1 M6 L
C213,C214
C215
C216
C21B
C219
cEA 2R2M 50L
C223
ACG-004
C 2 0 1, C 2 1 ' l, C 2 2 4 C e r a m i c { 0 . 0 1 / 1 5 0 V )
c c D s l 1 0 1 K5 0
CKDYF 473250
ACH-212
C204.C205
C220
C 2 2 5 , C 2 2 6 E l e c t r o l y t i c( 12 0 0 0 / 5 6 V )
t
I
t
I
t
I
I
I
lf
il
I
I
I
sx-3€lCIcl
FL IndicatorAssembly(AWV-009)
RESISTORS
When ordering resisfors, conuert the
resistanceualue into code form, and
then rewrite the part no. as before.
CAPACITORS
Part,No.
Symbol& Description
Part No.
Note
Symbol & Descriplion
t
;i; RD%PMF llCil J
R D % P Si r n l ] J
R S I P f l u i _ . J1
, 211,R214,
R 2 0 1 ,R 2 0 2 ,R 2 0 7 - R 2 0 9 R
R 2 1 5 ,R 2 1 7 , R 2 2 4 - R 2 2 8
R 2 0 3 - R 2 0 6 ,R 2 2 3
R 2 1 2 ,R 2 13 , R 2 3 0 ,R 2 3 1
R 2 1 0R
, 216
C E A R 4 7 Ms O L
C E A4 7 , M
I lOL
C K D Y F 1 0 3 25 0
c K o Y X 4 7 3 M2 5
c c D c H 1 0 1 K5 0
I
I
rnr.l
A Ro'zpsr
R222
ccDcH 020c 50
C E A N LO l O M5 0
C E A 1 0 1 M2 5 1
coMA 332J50
cosH 201J50
T
T
I
I
I
I
RD%PM :I[,]fJJ
SEMICONDUCTORS
Parl N o .
2 S D 3 31
2SK34
25C2575
2SC1915
2SB6B2
{2 S 8 5 0 }7
2 S A 9 12
2SA905
rl.r orz
KZL.140
l5t33C
Symbol & Description
0 2 0 1 , 0 2 0 9 ,o 2 1 0
o202, o206
0 2 0 3 ,0 2 1 1
o204
uzu0
D201- D206
D201
D208D
, 215
D2l3
o214
Trimmer
c30,c32
c27,C29
Part No.
Symbol & Doscription
PartNo.
OTH EBS
Part No.
ATT.678
PB Z 3 O P O 6 OMFC
Symbol & Description
T1
H e a l e rt r a n s f o r m e r
t
,i. AKE-054
ASX.137
t
TC1
c33-C39
c31
R r - 8 6 . R 9 - R 3 3 .R 3 5 - R 6 1
V R 1 .V R 2 S e m i -i xf e d2 . 2 k
SEMICONDUCTORS
MZ-171
M Z . 11 0
{w2,110)
t
T
c 1 ,c 2
c10
c4, c5
c23
(SR3AM.4}
TerminalAssemblytGWS-222)
Speakers
I
vzz
RESISTORS
RDTAPM
OIIO J
ACP-001
0209-4212
c 1 6 ,C 2 B
, 6
c 1 2 , C l 4 ,C l 7 - C 2 1 C
c7-c9, c1 3, C15, C2s, C26
When ordering resrsfors, conuert the
resistance ualue into code form, and
then rewrite the part no. as before.
Note:
o207
o208
{ 15 2 0 7 6 )
,f. sooa
ACM-010
C E AO l O Ms O L
C E A2 2 1 M1 6 L
't01K
ccDSL
50
CKDYF 473250
a'l
Symbol & Description
TA7318P-A
H A I 2 0 10
P
M54451
PD5009
2SC2575
{2SC945A)
o1
02, 03
o4
2SC461
Ql1
06-0lo
OTHERS
Part No,
Symbol & Doscription
Part No.
T e r m i n a l( S P E A K E R S )
R e m o t e s l i d es w i t c h
(SPEAKERS}
SwitchAssemblytGWS-223)
Part No.
Symbol & Description
R e m o t e P U s hs w i t c h
(SPEAKERS}
ASX-135
Jack Assembly(GWK-146)
Headphones
lg.l Io,
AKN.O3O
R S 2 P3 3 1 J
Symbol & Description
Symbol & Description
R F c h o k ec o i l
F l u o r e s c e n ti n d i c a t o r t u b e
T24-028
AAV-OO7
V1
AAV"O09
v2
{FBEOUENCY}
F l u o r e s c e n ti n d i c a t o r t u b e
(POW€Fr)
ASS-0I1
vcz30P080FMc
X1
Crystalresonator
L I ,
L Z
Switch Assembly (GWS-z24)
Part No.
ASG.230
Symbol & Description
s3
P u s hs w i t c h { B R I G H T N E S S )
P h o n ei a c k ( P H O N E S )
R 1 ,R 2
:
t
45
T
t
t
1 1 .P A C K I N G
T
t
\:./
t
T
t
;
t
T
T
t
Key No.
1.
2.
3.
4.
Part No.
D*cription
ADH.002
AR8-355
AHD-7s5
AHA-246
T-type FM antenna
Operating instructions
P a c k i n gc a s e
Side pad
T
t
il
I
il
rf
rf
I
$)rrroN€Err'
t
t
I
t
t
t
t
t
t
t
t
I
t
t
FM Ouartz Locked
S T E R E OR E C E I V E R
siFSgoos,c,s
r The basicperformance
of the S/G and S typesarethe sameas the KU type. This additional
servicemanualis applicable
to the S/G andS types.Please
referto the KU type servicemanual
with exceptionof this supplements.
1. SPEC|FICATIONS
The specifications for S/C and S types are the same as the
KU type except for following sections.
Power Requirements
KU type
. . . .AC 120V, 60Hz
S/G and S type.s . . . . .AC t t1V, tZ1V, 220V and 240V.
50/60H2
Power Consumption
KU type
S / G o n dS l l p e s
Weight (without package)
KU type
S/G and S lypes
. 200W(uL)
......200W
. . t6.2hg (JStb t2oz)
. . .t6.7hg (S6lbIJoz)
2, CONTRASTOF MISCELLANEOUSPARTS
NO?ES;
t Parts witltoul part number cannot be supplied.
t The $ marh found on some component parts indicates the importance of the
safety factor of the part. Therefore, when replacing, be sure to use partsof idenlical
designation.
ASSEMBLy
Symbol
Part No.
Description
KU typa
Switch assembly
S/G, S typss
AWS-146
AWS-148
Remarks
DE.EMPHASIS
ELECTRO-PARTS
Symbol
li rl
{, stl
,t
Powertransformer
L e v e rs w i t c h { P O W E R )
L i n e v o l l a g es e l e c t o r
R e s i s t o r2 . 2 M
F u s eh o l d e r
AC power cord
$rur
F use
Crsrs
Anr
Part No.
Description
KU typo
S/G, S types
ATT-577
ASK-507
ATT-683
ASK-508
AKR.O31
ACN-029
AKR.O32
ADG"O23
AEK-109
Remarks
ADG-046
A € K - 1 0 9( S / c )
A E K . l 0 1( S )
Part No.
Description
KU type
S/G, S types
O p e r a t i n gi n s t r u c t i o n s
Fuse
ARB-355
P a c k i n gc a s e
AHD-755
ARB-357
A E K - 1 0 1( S / c )
{ A 8 K . 1 0 7( S }
A H D . 7 5 B( S / G I
A H D - 7 5 5( S )
A H 8 - 10 4 ( S / c )
Spacer
t
t
I
T
P A C K I N GA N D F U R N I S H E D
PABTS
Symbol
I
I
I
t
Remarks
t
t
t
I
I
l|
rf
il
il
+
il
I
I
3
3. SCHEMATIC DIAGRAM, P.C. BOARD PATTERNSAND 1
3.1 SCHEMATIC
DIAGRAM
Gro
rEc2
r
I
LCN
iEc'
I
I
b.
60rn.i*&&rd
vrrdr
MtlAcf
6
$v
n
na
Og
.!<.o!
s!".r
::t
',:-j
"d!,q
60
!'
w
.
6c)
sI
al: .0!rr
-6)l
rirrrl
m'Brt
nq,r!
{v,,'
i (OC loitrf{?rtd!
oc,or!a
Vri!.!nI
rh,
d!
m4.tror
hyr
ild
!b. si.ty
oi
t - ' t l
!@.
l-lo,
A.r'y AwM-2?7
omFan
ol th.nr.!
th
th.'.io,.
*n.n,al-il{-
qr.? HArzqTF
s!
s2r
sJ.
L
s5:
5e r
s6-?
s6-l:
s6-.1
sti
50r
59
510
s'!
s'?:
5r3i
5rl-?
5$,
s6.
frE
uotrloi
t
ft-q!
r&
M@rrG ?
on- leq
slrlrc
t-?od8t
a- qlr
q- €f
L@€Ss
tM {UY'NG
g!-oFF
fu{rroi
{fv)
8-oFF
(
A
U
r
FU&TIO{
d-q!t
FU{drOff r4X}
Or- €!
FURCrrd r tuW)
On -QE
-*r.
rr G-asm$
4:
cOtr
StgtrO -rcrc
LOw trLrER l6x.l
d-$F
@r6xT{ESS
8Ft6iT -oMEe
sEAxcR
sElxEF
9{Ai€R
{ a)
q!- FF
raJ
d-qlt
|SPA)
(E- ort
SEAX€R ISPAr
ff-Qfl
tuER
oil -6F
!R€ vcT&
SELECrcR
- ?dv-?{
!q-llx
Thu&ld
A
iBi i^hl'*'cr
Oa.!,'mr.rErvrrnf,
Cr6A
?SCl9'9
"":i:"'.
cuffxt\r
'dqrsrh*tr6srm
ct
"I
1'#
,!J
m_{
I
@
74';
| :e
Y
I
l
-t
I
1
i
t l
--l
Li
I
{
,ei,]
L...
Ih{ 't ih. b.r{ rh.rrr(
a',{
du. i6,6n.d@"nt,n,td,s
_l
4
-.]1-t
t
-*--r,,t.^
'1"' )m*l;:
a a I
,rd.*drq l
.dl
I
."
!.5-r
,v3
1
fi5d;71
|
-
--
j
I
D PARTS LIST
-J
I
il,*3-'
- ---t
I
€ ut?d
q5 23(rS
OrJF2l,2atd
?9CAE
oa,23.2F!
2StX@
.rOr
,6l t
@l
J
ir"
:
L-
t
r
"
l''
swrTcH b.
GWS-226
I
I
POWERAnP A$'r
G#-t39
lr-l--.q.iliffi
.
PW€f,
SSfLy
o?o!&.2ro
zsu.
A..'L
GWR-IZ2 _ _
93Sr&9^!.sl_s
_ _
I
i '
aror.ro2 6cr775A
l
I
I
I
I
I
I
I
j
I
I
f*---<
I
@srrq
q6,6
qo7!l6
@,iro
Qilrril2
?$9t9
?SC2?91
zs^@
?*D6
?$EO
's"''3il3:i!11
oil1.il6
2996
Qilt,l!8
2SA750
or2rtr?? ?$$aA
or25,r?a 5c6aa
o?5!126 2SC??75
ora7,!?a 2sis5
qa9-lS
?SC675
qr
2scr!6a
ftrFl
sX-3EtC'O/si/GirS
NOTE:
The indicated semiconductors are representative ones
only. Other alternatiue semiconductors may be used,and
arc listed in the parts list.
$EAX€R
TEnr'IilAL
adt
Ga/s- 222
rtm'_l
;11ffifl |
It-tt*,"d*,
i
UJl--":':J
H€A8F}Si€S
JACK Ardy
ffi-16
.-._l-_i_--_.-*<ar
Gflr-t39
r
n
€tX-ggtOO/gi/Glrs
3.2 SWTTCH
ASSEMBLY(AWS-148)
t
;
t
t
;
t
t
t
;
;
;
t
;
;
;
I
Part No.
Symbol& Description
coMA 152J50
coMA 332J50
cl, c2
c3,c4
ASH{,I 7
s1
Slideswitch
(DE.EMPHASIS)