Pioneer SX-680 Service Manual page 37

Am/fm stereo receiver
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sx-680/S,
S/G
MODEL
SX-680/S,S/G
The
indicated
semiconductors
are
representative
ones
only. Other alternative semiconductors may
be used and
are listed in the parts list.
DE - EMPHASIS
SWITCH Ass'y
Beis Oty TP
CONNECTION Assy
Gwx-183
DIAL HLLUMINATE LAMP = @
GWX~ 201
By 300mA x3
.
2
f
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FU) 4A: NOV.120v
FM FRONT-END Ass'y GW8- 103
ka tp VOLT, C2 22P-
FM 3002.
BALANCE
ce
15.2.
UNBALANCE
ND
a, 3SK59
RogiS6 4
Ver Tle
a
ae
Ls Ms Ts
Cm 2 Rawsk
4
28C461
Q, 2SC535
tay Reet
MAIN
BOARD Ass'y
GWM~-119
Deco
182472
even
280712 ney
SWITCHES +
Si: FUNCTION
1 AM
2
FM
3
PHONO
4
AUX
Sp: TAPE MONITOR !
OFF — ON
Sj:
TAPE MONITOR
2
OEE — ON
Sa:
FM
MUTE
MODE
QN/ STEREO — OFF/ MONO
+ LOUDNESS
oF — oN
+ SPEAKER A
or On
: SPEAKER
8
OFF_— ON
: DE- EMPHASIS
Tus — us — 25ys
» POWER
OFF — ON
TUNING / SIGNAL.
METER
7
4
5
OO
Pe
ein
Pres
fide
Ca01.047
[———--———-
| PHONES JACK Ass'y
j
+
GWx-199
HEADPHONES
SP at Ww
OWER METER
Loch
POWER
METER
Roch
Ne
$900
2A: 220V,240V
SWITCHED
UNSWITCHED
Sow
1OOWw
L
SPEAKER
A
R
t
SPEAKER B
;
cy
at Ras:
Rye
: LINE VOLTAGE SELECTOR
ane
f a s
$ 12K
NOv— 120V— 220V - 240V
5,
:
3 338,
05, 0
%
Kk
OK Daer.soe
RESISTORS:
Aux
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al
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tc
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=
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se Pe
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fo MzZ-220
tte
(
lr
1
This is the basic schematic diagram. put the actual
PHONG
BY
6)
)
Kis
PHONO
Circuit may vary dye toimprovements in design
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2,
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:
a g/98
3 amit 35) Bi: 0
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VR
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toe
VR
BASS CONTROL
2SKN Taz
segue Bab
fi
36
3
.
golt_Res mG HI00P
' Ose TAPE
( REO)
INDICATOR Ass'y | Oson SOURCE (GRA)
GWX-177
(ee STEREO (RED)
3"
tt
bel "
i
ni
Rech
Len?
TAPE
MONITOR |
TAPE Ass'y
GWX- 188
14

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