Motorola Professional GP680 Service Information - Page 3

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Chapter 1

1.0 GP320/GP340/GP360/GP380 Model Chart.........................................................1-1

2.0 GP140 Model Chart .............................................................................................1-2

3.0 GP640/GP680 Model Chart .................................................................................1-2

4.0 GP1280 Model Chart ...........................................................................................1-3

5.0 GP240/GP280/GP540/GP580 Model Chart.........................................................1-4

6.0 Technical Specifications ......................................................................................1-5

Chapter 2

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

2.0 VHF 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 VHF Receiver.......................................................................................................2-3

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

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

3.3 Automatic Gain Control (AGC) .......................................................................2-5

4.0 Frequency Generation Circuit ..............................................................................2-6

4.1 Synthesizer.....................................................................................................2-7

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

5.0 Voice Storage (GP1280)....................................................................................2-10

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

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