Pioneer SX-680 Service Manual page 6

Am/fm stereo receiver
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SxX-680
3. BLOCK
DIAGRAM
ANTENNA
———s
=
Oo
FM 3000
| RF AMP
MIXER
P i d
IF AMP
Gy 1CKPASOO-A)
1 (PA 1001-A)
5
,
|
n
MTN
ees
752
Ory
EMPHASIS]
| AF AMP
GNO
LOCAL
|1
AM
OC
1
ose
L
L
—|
&)
"EM
6)
25y8/75ys
FRONT-END
©
Q
R. ch,
OyeM MUTE
STEREO
WM
@ !C (HAII97) ®
©)
AM TUNER
teal
AM/FM
METER
'ea wae
METER
prive
(4)
OUTPUT
35.548
FUNCT 10N
-2 d8—-| hie a9 |
be a
POWER
L. ch.
at kHz
re oy ITOR ie or
at {kHz
at kHz
dey METER
SZ
.
BUFFER
MUTING
POWER
AKERS
PHONO
EQ AMP
F(<)re(--O9)
if
AMP
GATE
eer
Ot
(RQ—O A
AUX
O
zs
=
=
G9)
TSE
—O
8
LOUDNESS
ae
ale
CONTROL!
ais
ORE
men
SOURCE GY"
REC
TAPE 2
TAPE
gfauence MONITO!
TO POWER STAGE
+B
-B
ie
e&)
4
R
O!1AL
SCALE
=
eh:
LAMPS
AC
POWER

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