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Icom IC-02A Service Manual

114mhz fm transceiver

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Service manual (82 pages)

Insrtuction manual (51 pages)

Instruction manual (48 pages)

Table Of Contents

Table of Contents

Table of Contents
Specifications
Version Table
Operating Controls
Top Panel
Front Panel
Rear Panel
Electret Condenser Microphone
Dynamic Microphone
Frequency Display
Key Pad
Tone Frequency for each Number
Circuit Description
Receiver Circuit
Antenna Switching Circuit
IF Amplifier Circuit
Transmitter Circuits
AF Circuits
Squelch Circuits
MIC Amplifier Circuits
PLL Circuits
APC and Power Set Circuits
Dual Modulus Pre-Scaler
Unlock Circuits
Power Supply Circuits
Loop Filter, VCO, Modulation Circuits
Internal/External Power Switching Circuit
Voltage Regulator Circuits
Comparator, Reduced Voltage Detection Circuits
Logic Circuits
Power Source Circuit for Computer
VOX Power Source Circuits
Other Circuits
Lamp Circuit
Beep Circuit
Transmit/Receive Switching Circuit
Tone Unit
Tone Call Unit
Block Diagram
Inside Views
IC-02At
IC-02E
Mechanical Parts and Disassembly
Disassembly of the Cases
Disassembly of the Top Panel
Speaker/Microphone Assembly
PTT Spring Assembly
How to Replace the Speaker/Microphone
How to Replace PTT Spring
Unit Bottom Assembly
Bottom View
Maintenance and Adjustment
Measuring Instruments Required for Adjustment
Preliminary Checks
Transmitter Output Checks
Receiver Checks
Preparation and Procedure before Servicing
How to Check
Receiver
Transmitter
Modulation
Pll
Basic Alignment Procedure
PLL Circuit
Lock Adjustment
Transmission
Reference Frequency Oscillator Adjustment
Power Adjustment
Modulation Adjustment
LO Output Adjustment
RF if DET Coil Adjustment
Others
Receiver Spurious Response
Receiver Audio Output
S-Meter
Board Layout
Main Unit
PLL Unit
Logic Unit
Diode Matrix
Voltage Charts
Transistors Voltage Chart
Main Unit Voltage Diagram
PLL Unit Voltage Diagram
Logic Unit Voltage Diagram
Tone Unit Voltage Diagram
Tone-Call Unit Voltage Diagram
Troubleshooting
No Power on
Lock Failure
No Reception
No Transmit RF Power
IC Specifications
Hd 44795(Mpu)
PD 2834C (PLL Frequency Synthesizer)
PD571C (Low Power Prescaler)
MC3357 (Low Power FM IF)
S-81250HG (C-Mos Voltage Regulator)
S-7116A Tone Generator C-Mos LSI
SC-1025 (VHF Power Amplifier Module)
TA75358P (Dual Driver)
TA75393P (Dual Comparator)
TC4069UBP (Hex Inverter)
TC4071BP (Quad 2-Input Positive or Gate)
TC4094BP (8-Stage Shift-And Store Busregister)
TC5082P (Oscillator and 12 Stage Divider)
Parts List
Schematic Diagram

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1 Specifications
2 Operating Controls
3 Tone Frequency for each Number
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