Table of Contents
Table of Contents
Copyright ........................................................................................................ i
Safety Information......................................................................................... ii
Document History ........................................................................................ iii
Maintenance ........................................................................ 1-1
1.1
Preventive Maintenance ................................................................................................................ 1-1
1.2
Inspection ...................................................................................................................................... 1-1
1.3
Cleaning......................................................................................................................................... 1-1
1.4
1.5
2.1
Test Equipment.............................................................................................................................. 2-1
2.2
Service Aids................................................................................................................................... 2-2
3.1
4.1
RX Audio Circuit ............................................................................................................................ 4-1
4.1.1
Audio processor IC (U102) ............................................................................................... 4-1
4.1.1.1
4.1.1.2
4.1.2
Audio Amp ........................................................................................................................ 4-2
4.1.3
4.2
TX Audio Circuit............................................................................................................................. 4-3
4.2.1
MIC and External MIC ...................................................................................................... 4-3
4.2.2
4.2.3
Audio processor IC (U102) ............................................................................................... 4-3
4.2.3.1
4.2.3.2
4.2.4
4.2.5
TX modulation Adjustment................................................................................................ 4-4
4.3
Microprocessor Circuitry ................................................................................................................ 4-4
4.3.1
Memory Usage ................................................................................................................. 4-5
4.3.2
4.3.3
4.3.4
4.3.5
Sensing of VOX operating ................................................................................................ 4-5
4.3.6
4.3.7
RX Audio Processing......................................................................................... 4-1
TX Audio Processing ......................................................................................... 4-3
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