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Icom
IC-T90A
manual
32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan
Models:
IC-T90A
1
57
57
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57 pages
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Specification
Parts list
Block Diagram
Accessories
Connector AXK6S30445P
Disassembly Instructions
Adjustment Procedures
Trimmer Adjustment
Power Supply Circuits
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1-1-32,
Kamiminami,
Hirano-ku,
Osaka
547-0003,
Japan
S-13903MZ-C1
2002 Icom Inc.
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Contents
IC-t90a
Ordering Parts
Introduction
Repair Notes
Sample Order
Table of Contents
Specifications
General
Transmitter
Frequency MHz
Receiver
WFM
WFM
Logic Unit
Inside Views
Top view
Bottom view
AF Unit
RF Unit
Top view Bottom view
Removing the rear panel Removing the AF unit
Disassembly Instructions
Receiver Circuits
Circuit Description
4 1ST Mixer and 1ST if Circuits RF, AF and VCO Units
5 2ND if and Demodulator Circuits AF Unit
RF Circuit
AF Amplifier Circuit AF Unit
Squelch Circuitaf and Logic Units
2ND if and Demodulator Circuit
Transmitter Circuits
APC Circuit RF Unit
PLL Circuits
General
APC Circuit
PLL Circuit
VCO Divider Circuit VCO and RF Units
2 R3V Switch IC AF Unit IC51
Power Supply Circuits
Port Allocations
Voltage Line
CPU Logic Unit IC1
Dtcs
Ctsel
LCD
SEG35
Operation on the Adjustment Mode
Adjustment Procedures
Operation on the Output Power Adjustment
Preparation
Connection
JIG
AD-92SMA
PLL Lock
Trimmer Adjustment
VCO
Voltage
RF Unit
VCO Unit
L16 L456
L19
Reference
Adjustment Mode Adjustments
Dial
Frequency
Adjustment Mode Adjustments
PH ch 53.900 MHz Transmitting 8V 145 MHz Displayed frequency
Connect an amme 45 a
R325
Logic Unit
R365
R326
Ctcss
Detector
Coil
Tracking
CP0
AF Unit
IC151, pin 12 SD line
L151
Displayed frequency Connect a DC volt Maximum voltage
Meter
Adjustment Adjustment Condition Operation
Order Description
Section Parts List
Coil Eljre 3N9Z-F
Ceramic ECJ0EB1H681K
Connector AXK6S30445P
Ceramic ECJ0EC1H060C
Encoder
Trimmer
Tantalum ECST1EY474R
Ceramic ECJ0EC1H2R5B
Mechanical Parts and Disassembly
Accessories
Chassis Parts
RF Unit
Logic Unit
Chassis Parts
AF Unit VCO Unit
Transistors and Fets
SEMI-CONDUCTOR Information
Diodes
Name
TOP View
Board Layouts
MC1 Microphone
DUP
Bottom View
Logic unit
SP1
SQL PTT
RF Unit
RF unit
AF Unit
VCO Unit
EXT.SP EXT.MICREMOTO
S253S252
Logic Unit
Block Diagram
Loop LPF HPF Drive BPF ANT FIL AMP
Chassis
11 1 Logic Unit
Voltage Diagram
IC5
2SK3476
11 2 RF Unit
BU4094BCFV
11 3 AF Unit
URL
32, Kamiminami, Hirano-ku, Osaka 547-0003, Japan
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