Motorola Professional GP640 Service Information - Page 3

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Chapter 1

1.0 GP340 Model Chart .............................................................................................1-1

2.0 GP640 / GP680 Model Chart ...............................................................................1-1

3.0 Technical Specifications ......................................................................................1-2

Chapter 2

1.0 Introduction ..........................................................................................................2-1

2.0 Transmitter...........................................................................................................2-1

2.1 Power Amplifier ..............................................................................................2-1

2.2 Antenna Switch...............................................................................................2-2

2.3 Harmonic Filter ...............................................................................................2-2

2.4 Antenna Matching Network ............................................................................2-2

2.5 Power Control Integrated Circuit (PCIC) ........................................................2-2

3.0 Receiver...............................................................................................................2-3

3.1 Receiver Front-End ........................................................................................2-3

3.2 Receiver Back-End.........................................................................................2-4

3.3 Automatic Gain Control Circuit .......................................................................2-5

4.0 Frequency Generation Circuitry ...........................................................................2-6

4.1 Synthesizer.....................................................................................................2-6

4.2 Voltage Controlled Oscillator (VCO)...............................................................2-8

Chapter 3

3.0 Troubleshooting Flow Chart for Transmitter ........................................................3-3

4.0 Troubleshooting Flow Chart for Synthesizer........................................................3-4

5.0 Troubleshooting Flow Chart for VCO...................................................................3-5

Chapter 4

PCB/SCHEMATICS/PARTS LISTS

1.0 Allocation of Schematics and Circuit Boards .......................................................4-1

1.1 Controller Circuits ...........................................................................................4-1

2.0 PCB 8485726Z01 - Schematics...........................................................................4-3

3.0 PCB 8485726Z01 - Parts List ............................................................................4-11

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