Technics SA-GX550 Service Manual page 24

SA-GX550 SA-GX550
1 2 3 4 6 7 8 9
AY TUNER CIRCUIT For CE,E8,G,GNJareas.
Z120 FM FRONT END (ENVI7290GI)
er te 28K238 28C2620 yp 7d
SIGNAL | RF AMP 22 FM MIXER A | e101, 102
uKIOI \ 4p 4__@)———=> 2SC2787LTA
22P ISP ap
cr FM 1F AMP
FM ANT $= —4 4 5 ) my My] ne 7 Riba '
(752) ee be is iT! II x 4 | AT ee ee ee ——~« ee
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=
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(@) Rios | clos = R108 CF202
| : at pana e 470K | J4?P 470K ee Tg
0.022 100
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| POWER SUPPLY
L--9—4 (FM:ON)
|
9 | R103
— tay Q106
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\
100
(ov) P 14.1V
°
| 25k360 2802996 iss 28} FM (EB) LINE a ats &
M OSC BUFFER AMP Sor &
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Q107, 108
2SC33IIAQSTA
A ail, BUFFER AMP
B g | (14.1Vv)
RIO IK
wa
Lies
Sead. k14.1v>
AM(LW/MW) 0.473H 1c101 RI47 R143.
i
SPEAKER
DRIVE/Lch) OSC SIGNAL FM OSC | LA1830-H3 Sa es 470K 2.2K
\ SIGNAL FM/AM IF AMP, DET/AM OSC, MIX/FM MPX
LIgI
vKIOI iH A—- x =
Lind fo}
am ant @ c B ™ os mes 198
j, in ag + O8 Tog
08 & 7
AM 2
(LW/MW) ¢ Re
oI SIGNAL q D <3
| ae O Y <4.7V> |<6.2V> k2.1V> V> KO5V> |XL9Vv>
Qigin 193 Ico ery fe 2v) a Ns eM 10.5) thew
AM LOOP ANT 25C331IAQSTA 45v [ov 27 jeev fiv 15V
L_— Jo LW/MW SWITCHING
= <0V>
3 (88Y) cory R148
3 . (ov)
470K
3
FREQUENCY cia2
DIVIDER 50V1
Qis2 +H
Iclo2
RI9I 10K LC7218 Ry
PLL FREQUENCY .
SYNTHESIZER
as
ae
B s
ae
x n
| | " oF
c o xO
Rx o =
=o
=
\
aro a
cH RIS
25V47 560 C134 18P
cl28 NO.O1 cl29
6.3VI00
RECEIVED SIGNAL-OV
o- fs
AB i B
A
ry Tater MAU
CIRCUIT (CNIOIA)
On page 35
c
B
103,104 7 14.1V
2SC2785FETA
FM/AM (LW/MW)
LOOP FILTER
A B
' ie
cK2
B =e: DATA2 To MAIN
D102
| ba
L ch OUT > CIRCUITI(CNIO2A)
MAIG5TA A
LB CE Pavpaee 3
(2) Reh OUT
F
S30KHz ++ 1€20KHz