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STR-GX290/GX390
4-7. SCHEMATIC
DIAGRAM —TUNER
Section—
1
2
3
4
=)
6
7
8
9
10
11
12
13
14
e IC Block Diagrams
IC21 LA1851N
CFT21
[ag
FM STEREO
oe
C445
}—(7)
OPERATION
LEVEL
AM IF.MPX
FM BET.MPX
FM-SB-ABJ
DETECTOR
CHARGE
Va
PUMP
SWALLOW
12 BIT
COUNTER
ie PROGRAMMABLE
1/16, 1/17 ay
DIVIDER
FM-IN
Q21
2502603
AM AMP
ease ai
eee
aa
252
A,
EE
.
C23
R21
B
RIRIEL
ee
ae
reel a
eee
Pre
(i Caccmearcaaer
R87
CNJ2:AEP/CN1:G
Q24
-_
2803402
i
| R CH
MONO SWITCH
a
Oo
GND
Note:
H
PT TT | ep L CH
akin RON
e
*, *A, *B: See page 6 for Note on Caramic Filter (CF1, 2)
e
: B+ Line
Oa
te
cnP202
eee
a Ee a
ah
east
ia
e
Ail capacitors are in wF unless otherwise noted. pF: wuF
© [__]:
adjustment for repair.
Qs
Oy
SV
ere
:
25A1348
es a
GNB
SOWV
or less are not indicated except for electrolytics
@
Voltage
and waveforms
are dc with
respect
to ground
Bey
and tantalums.
under no-signal (detuned) conditions.
R108
SWITCH
CNJ1:AEPR/CN2:G
nie;
100
e
All fesistors are in Q and '/,W or less unless otherwise
e
Voltages are taken with a VOM (Input Impedance
10M 2).
i
7508305
bal SIGNAL
specified.
Voltage variations may
be noted due to normal produc-
MAM
es
eT
RESET
e
4:
internal component.
tion tolerances.
SWITCH
ene
| ae
e
—d
: nonflammable resistor.
@
Signal path.
C105
fue
{S192
et STEREO
o>
SEM
Syn
c o n e
ot
poy TUNE®
TO MAIN BOARD
Note:
re GND
CNP201
The components identi-
,
G:Germany
of
BO «PLL?
fied by mark
or dot-
Of
BI (PLL
are critical for safety.
WTS soa =
el gl CE (PLD
Replace only with part
number specified.
—26—
—27-
~28—
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