Motorola Professional GP640 Service Information - Page 3

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Chapter 1

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

2.0 GP1280 Model Chart ...........................................................................................1-1

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

Chapter 2

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

2.0 UHF2 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 UHF2 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 Control Oscillator (VCO)....................................................................2-8

5.0 Voice Storage (GP1280 Only) ...........................................................................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

Chapter 4

UHF2 PCB/SCHEMATICS/PARTS LISTS

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

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

1.2 Voice Storage Facility.....................................................................................4-1

2.0 UHF2 PCB 8485641Z02 / Schematics ................................................................4-3

3.0 UHF2 PCB 8485641Z02 / PCB 8485677Z01 Parts List ...................................4-11

4.0 UHF2 PCB 8485677Z01 (GP1280) ...................................................................4-15

3.0 UHF2 PCB 8485677Z01 / PCB 8485641Z02 Parts List ..................................4-11

5.0 UHF2 PCB 8485677Z01 Voice Storage Parts List (GP1280)............................4-18

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