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ST-H2750/H3750
© IC Block Diagrams
IC21
LA1851N
PHASE
aioe]
[Te
2 oT
COUNTER
PROGRAMMABLE
1/16, 1/47 BIT
¥
OVIDER
Note:
a
e
All capacitors are in uF unless otherwise noted.
pF: uuF
S5OWV
or
less are
not
indicated
except
for electrolytics
and tantalums.
SHIFT REGISTER
UNIVERSAL
e@
All resistors are in 2 and '/,W or less unless otherwise
COUNTER
at
specified.
e
4:
internal component.
©
4
: nonflammablie resistor.
The components identi-
fied by mark
Les composants
identifiés par
une
marque A\sont critiques
pour la sécurité.
or dot-
ted line with mark
are critical for safety.
Ne les remplacer que par une
Replace only with part | piéce portant le numéro spéci-
number specified.
fié.
[7]: adjustment for repair,
Voltage
and waveforms
are de with
respect
to ground
under no-signal (detuned) conditions.
no mark: FM
(
): AM
@
Voltages are taken with a VOM
(input Impedance
10M Q).
Voltage variations may
be noted due to normal produc-
tion tolerances.
@
Waveforms are taken with a oscilloscope.
Voltage variations may
be noted due to normal produc-
tion tolerances.
@
Signal path.
o
:FM
ST-H2750/H3750
ST-H2750/H3750
4-2.
SCHEMATIC DIAGRAM —TUNER SECTION—
1
2
3
4
5
6
7
8
9
10
11
12
13
14
ee
Re
td
eR
ear
een
ETE
-
=
~—
EE
SUE
RIMES
ETD
=
ESS
{TUNER BOARD)
siciaezlas
|
Fe1
FM FRONT-END
~ scien} FM Mere
ddan
8
04
o
3000.
IC21
Cri
ANTENNA
=
RV24
LA1861N
FM DET, MPX
RV22
AM
1F,DET
[AM TUNING |
RV22
C37
m-C40
c39
22k
10
0.1
0. 01
SOY
50v
R35
47k
ec
2B Lae
Ow
)
il
i Yo
az Be
Q21
28C3330
Q22 28C3330
} PRE AMP
@ TU-ST-RESET
M-DET~SUT
AM-MIX
(=)~
R29 10K
0.47
SOV
C31
C32
0.1
SOV
926
28C3402
MUTE
C62
0.022
co
024 28C3402
SWITCH
SWITCH
12
081
2SA1 348
cm
R106
$R102
k 7 560
R107 | R106
7k | 4.7K
ro
nw NO
Say
no
( TCBOO7—2NJFH)
2
4
CNJ60I
8 R108
100
§
BR
+
R OUT
GND
GND
L OUT
:
DIGITAL GND
| conTROL 1
+13V
+5V
NC
AU
BUS
VF
VF
VG
GND
GND
C104
0.01
C103
0. 01
ar
C10S
47 16V
RBt
1k
R82
Ik
R83
1k
Q83 2SK246 GR3
84
2SC3112A
F
a
1.26Vp-p
aot
mr Eieeen One
0.14 ySeC
R60!
10
CNs1
CNJ602
CNJ604
EAN
ETS | GIN
RENTTTEEESS
04
TO DISPLAY BOARD CN70}
TO DISPLAY BOARD CNJ702
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