Table Of Contents - Icom Ic-2A Maintenance Manual

Table of Contents

Table Of Contents2
Specifications3
General3
Transmitter3
Operating Controls4
Top Panel4
Front Panel4
Antenna Connector5
Transmit/Battery Indicator5
Squelch Control5
External Mic Jack5
Circuit Description7
Receiver Circuits7
Antenna Switching Circuit7
Rf Amplifier And First Mixer7
Transmitter Circuits8
Mic Amplifier Circuit8
Multiplier And Driver Circuits8
Power Amplifier Circuit8
Programmable Divider Circuit9
Reference Frequency Generator Circuit9
Phase Detector And Loop Filter Circuits9
Vco Circuit9
Two-Tone Encoder Circuit10
Led Indicator Circuit10
Block Diagram11
Inside Views12
Main Unit Side12
Pll Unit Side12
Mechanical Parts And Disassembly13
Disassembly Of The Cases13
Disassembly Of Units14
Top Panel Construction And Part Names15
Vol/Sql Controls And Bnc Connector Assembly15
Ptt Spring Assembly16
Unit Bottom Assembly16
How To Replace Contact Spring16
Maintenance And Adjustment17
Measuring Instruments Required For Adjustment17
Preliminary Checks18
Transmitter Output Checks18
Receiver Checks18
Preparation And Procedure Before Servicing18
How To Check19
Receive19
Modulation20
Pll21
Bcd Chart21
Basic Alignment Procedure22
Pll Circuit22
Lock Adjustment22
Pll Lo Frequency Adjustment22
Power Adjustment23
High Power23
Low Power23
Modulation Adjustment24
Modulation Check24
Spurious Transmission24
Lo Output Adjustment25
Rf If Det Coil Adjustment25
2Nd Lo Frequency Check25
Receive Audio Output25
Board Layout26
Main Unit26
Pll Unit27
Ef Unit28
Switch Board28
Vr Board28
Battery Contact Board28
Touch Tone Unit29
Voltage Charts30
Transistors Voltage Chart30
Ic's Voltage Chart31
In Transmit Mode31
In Receive Mode31
Ic-2E Main Unit Voltage Chart32
Ic-2E Main Unit Voltage Chart ( Transmit )34
Pll Unit Voltage Chart40
Troubleshooting44
No Power On44
Lock Failure45
No Reception46
No Transmit Rf Power47
Ic Specifications48
Maximum Ratings48
Pin Connection48
Phase Comparator50
Oscillator And 10 Stage Divider50
700Mw Amplifier50
Parts List51
Schematic Diagram55