Ic Internal Diagrams - Radio Shack PRO-2050 Service Manual

IC INTERNAL DIAGRAMS
IC1
j.!PC8112T
r-------.--.......
----~------<~--_{5
La in
GND
RF in
3
}-----t------1-l
IC2
MC3361COR2
CRYSTAL{ 1
MIXER
INPUT
MIXER
OSC. 2
CRYS' ' ' { ,
INPUT
MIXER
14
~~~If
OSC.
::e
OUTPUT
I-
GND
SCAN
§
CONTROL
MIXER
cr: en
w_
MUTE
LIMITER
SQUELCH
OUTPUT
<,en
INPUT
5
INPUT
<,W
-cr:
FILTER
cr:w
DECOUPLING { :
1-1-
SCAN
OUTPUT
Vee
::een
u>
CONTROL
o
FILTER
...J::e
w
INPUT
:::>
LIMITER
0
SQUELCH
QUAD
8
9 DEMODULATOR INPUT en
IN
INPUT
OUTPUT
DECOU""G{
s
FILTER
OUTPUT
FILTER
INPUT
QUAD
8
9
RECOVERED
COIL
AUDIO
,;J;
IC3
TBA820M
7
6
FREQUENCY
RIPPLE
R1
COMPENSATION REJECTION
2k
5
3
GAINSETIING BOOTSTRAP
INPUT SUPPLY VOLTAGE
GND
-35-