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PRO-2022
Service manual
Bloek Diagram - Realistic PRO-2022 Service Manual
Desk-top programmable scanner
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Table of Contents
Troubleshooting
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Table of Contents
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BLoeK DIAGRAM
LOW/AIR/HI/RF
AH?
+---~
AGC CONT
.
MIX
f-1.-(
01 02 03
[ill)
o
30-54MHz
108-136HHz
136
.005-174HHz
10.7HHZ
IF AH?
I--~
018
CRYSTAL
FILTER
AGC
10
.245MHz
,.....-i
' o
'
h
, ,
OSC MIXER
IF AH?
O
UAORAT URE .OET
NOlSE AH?
ICI
I
SOUELCH
I
>
I-
369
.3-501 .3MHz
118
.7-167 .1MHz
TRIPLER
lE-....---t
VCO (AIR/HI!
011
UHF LOW)
~
09 010
380-512MHz
UHF LOW RF AH?
MIX
04 05
806-960MHz
8UFFER
08
40
.7-64
.7HHz
VCO (L O W)
06 07
CERAMIC
FILTER
455KHz
AM IF AH?
OET.
022 023
I
,
U
H F
Hl
RF
AMP.
M
IX
012 013 014
~
- J
816.7-970
.7MHz
00U8LER
016
JE-
408
.35-485.35MHz
VCO (UHF H
IJ
015 017
SWITCHING
019
LOW
A
IR
H
IGH
U
HF
LOW--.1
UHF Hl
--.1
8ANO
SELECT
026-32
ZER O MATIC
IC2
024
M
U T E
020
021
lY:ïlLïiMEJ
<
>fo
~
,....-------, I;
HEAO
A
U OIO
AMP
.
'"
PHONE
IC 2 IC3
~
/
I
t--I--{')
'-'
AC120V
(240V)
RECTIFIER
060
O
C 13. 8V
036
,....---t---;.
:
.
- - - ,
0,57
I-.+------t-~
,
---+---(
037
,....--
.
.,
,....---------'
VOLTAGE
REGU LATOR
lC5 040
VOLTAGE
REGULA T O R
rC
4
1
..------'-------,
OC-OC
CONVERTER
034 035
054-56
MEMORY
(R A M)
IC6
5.6V
CPU
IC7
CPU CONTROL
033 041
Y
'
0
'
f -J
2HHz
I
I I
PLL
rC8
L
C D
6.4M Hz
~:O~
LOW PASS FILTER
~--J
036 037 038
I
K
EY B
OARD
De-AC
CONVERTER
025
LOW BAH
.
OET.
rC2
(1/
4)
9VBAH
.
-
4
-
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