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2.9.1 Power Amplifier ............................................................................................2-12
2.9.2 Antenna Switch ............................................................................................2-12
2.9.3 Harmonic Filter .............................................................................................2-13
2.9.4 Antenna Matching Network ..........................................................................2-13
2.9.5 Power Control Integrated Circuit (PCIC) ......................................................2-13
2.10 VHF Receiver .....................................................................................................2-14
2.10.1 Receiver Front-End ......................................................................................2-14
2.10.2 Receiver Back-End.......................................................................................2-15
2.10.3 Automatic Gain Control (AGC) .....................................................................2-15
2.10.4 Frequency Generation Circuitry....................................................................2-16
2.11 Synthesizer ........................................................................................................2-16
2.12 Voltage Control Oscillator (VCO) .......................................................................2-17
Maintenance
3.1 Introduction ..........................................................................................................3-1
3.2 Preventive Maintenance.......................................................................................3-1
3.2.1 Inspection .......................................................................................................3-1
3.2.2 Cleaning .........................................................................................................3-1
3.3 Safe Handling of CMOS and LDMOS ..................................................................3-2
3.4 General Repair Procedures and Techniques.......................................................3-2
3.5 Recommended Test Tools ...................................................................................3-4
3.6 Replacing the Circuit Board Fuse ........................................................................3-5
3.7 Removing and Reinstalling the Circuit Board.......................................................3-6
3.8 Power Up Self-Test Error Codes..........................................................................3-7
3.9 UHF Troubleshooting Charts ...............................................................................3-8
3.10 VHF Troubleshooting Charts..............................................................................3-14
3.11 Keypad Troubleshooting Chart ..........................................................................3-20
Schematic Diagrams, Overlays, and Parts Lists
4.1 Introduction ..........................................................................................................4-1
4.1.1 Notes For All Schematics and Circuit Boards.................................................4-1
4.1.2 Six Layer Circuit Board...................................................................................4-2
4.2 Flex Layout...........................................................................................................4-2
4.3 Keypad-Controller Interconnect Flex Schematic ..................................................4-3
4.3.1 Keypad Top and Bottom Overlays .................................................................4-4
4.4 Speaker Microphone Schematic ..........................................................................4-5
4.4.1 Speaker Microphone Assembly......................................................................4-5
Содержание PRO3150
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