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IC-24AT
Icom IC-24AT Service Manual
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MAIN
UNIT
AF
amplifier
circuit
(AF
UNIT)
UHF
power
module
(IC1;
SC-1097]
VHF
power
module
(!C1:
SC-1
090)
UHF-PLL
UNIT
—
—
-
(Included
UHF-VCOUNIT)
VHF-PLL
UNIT
Microphone
amplifier
circuit
(MIC
UNIT)
Charging
circuit
(PRTUNIT)
UHF
RF
amplifier
circuit
Demodulator
circuit
(DET
UNFT)
2nd
LO
crystal
(X2:CR-214
30.42
MHz)
VHF
RF
amplifier
circuit
LOGIC
UNIT
CPU
dock
(X2:
CSB800J201
79S.642
kHz)
Microphone
(MCI:
WM-62A)
CPU(IC1:
HD4O4606A48H)
Buift-in
dock
crystal
(XI
:DT^26S
32,768
kHz)
Lrthiunn
backup
battery
(BT1
:
VL2020*1
VC)
2-1
4
6
Table of Contents
Table of Contents
3
Specifications
4
4- Uhf Receiver Circuits
7
Vhf Transmitter Circuits
7
Pll Circuits
8
Uhf Transmitter Circuits
8
Logic Circuits
9
Power Supply Circuits
11
Front Panel
12
Accessories
13
Rear Panel
13
Preparation before Servicing
23
Pll Adjustment
24
Receiver Adjustment
24
Transmitter Adjustment
26
Board Layouts
28
Keyboard and Ptt Unit
28
Logic Unit
29
Adenca Unit
31
Initial Matrices
31
Main Unit
33
Apc and 7-9 Det and Uhf Ygr Units
36
Vhfrf, Vhf Col, Uhf Rf and Uhf Col Units
38
Vhf Pll. Uhf Pll and Uhf Vco Units
39
Lpf and Hpf Units
40
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Instruction Manual
44 pages
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Icom IC-24AT Specifications
General
Brand
Icom
Model
IC-24AT
Category
Transceiver
Language
English
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