Sony ST-88 - Page 16

5-3. SCHEMATIC DIAGRAM FM(A-m) Front-End/IF Amp /MPX and
é 2 Xs a ye Sa ae Se
QiOl 25K42 102 2SK234 Q201,Q202 2S¢403C Q203 2SC710 Q204 2SC7!0 Q205 2$¢403¢ 0201,0202 iT22A
(FM
RF
AMP)
(FM
MIXER)
{EM
EF
AMP}
(FM
i-F
AMP)
0208,
0209
IFMACM
FF
AM)
(EM/M
PF
AMP)
£120
p29)
S820,
aev 181555 ig eRe NOT
@202 22083 ” g 51
Q102 av IFT Iot ie 6239 : if ‘al jc2!?
uv
mo
—4
$20!
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=
a0
8
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Ti
Fo
8)
5
!
I
\
= OE NS 5 1
6} sf * 1 [Go _toege nnn af== "sea 240p
iS 2 = 1
Nile: Lbg------ R229 470
mie 8 c2te 71348 0000
CF 202] 120 (-20¢8}
Ql03 2sc7io
(FM OSC}
iP
801 8
ANTENNA w.
TERMINAL 5
S
Power
Supply
Board
=
~
~AEE
and
UK
Mode:
1
Q70t D701,D702
2scil24 lo02
a oe are tata |
woe ee ee
0703 0704
1T243M =: IT243M
Preamplifier Board
pa ob Re
R36 cy4 XK
= S88 ‘or Bike = « @
: 17-22 3
[2s abiigesv
3
ET wh fel Fee
bod
503
OS BT Sis =
474 RBI
a7v (ov)
+2246 (-28dB)
Tea Ta ed
Le---__ e - - d
g
a
=
2
R248 0207 4
910
ISI555
>
Q501,9503
Q502,
9504
tev 2SC632A csos 2SC634A
5 {PRE AMP) (OOp (PREAMP)
-——T7 4 =
sez ay LT) tase
2648 | 6592 «120k 510 leig” NF 33k.
(-3008)
TH O8Y “> yee) 509
-16—
10 ON
$803 }
> OFF
AFC SW
TUNER INPUT
-+8dB
j (+5,6d8) 1802
OUTPUT
5 sR608 He TMINAL
€O) HIGH
a ag vat :
sisP ©)normay
oe a
fo) HGH —
Attenuator Board
Ref, No. Description Position
$801 BAND SW FM
(FM-AM)
$802 MODE SW STEREO
{STEREO-MONO)
$803 AFC SW ON
(ON-OFF)
$804 POWER SW OFF
(ON-OFF)
Note: All resistance values are in ohms. k = 1,000 M = 1,000k.
All capacitance values are in UF except as indicated
with p, which means MMF.
All voltages are dc measured with a VOM having 20 k
ohms/volt input impedance. No signal in,
Voltage variations may be noted due to normal
production tolerances.
Audio signals are expressed in “dB” referred to
0.775 V (0 dB) 400 Hz, receiving fm rf signal of
98 MHz [1,000 LV (60 dB), 75 kHz (100 %) Mod.}.
t 1?
(.. dB ):
%&: C315 and C316 are for USA Model only
Capacitors marked A are built in each transformer.
stereo operation