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iii

Table of Contents

Chapter 1 THEORY OF OPERATION

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

2.0 UHF2 Transmitter ................................................................................................1-1

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

2.2 Antenna Switch...............................................................................................1-2

2.3 Harmonic Filter ...............................................................................................1-2

2.4 Antenna Matching Network ............................................................................1-2

2.5 Power Control Integrated Circuit (PCIC) ........................................................1-2

3.0 UHF2 Receiver (All models except those with PCB 8486686Z02) ......................1-3

3.1 Receiver Front-End ........................................................................................1-3

3.2 Receiver Back-End.........................................................................................1-4

3.3 Automatic Gain Control (AGC) .......................................................................1-5

4.0 UHF2 Receiver (Models with PCB 8486686Z02) ................................................1-6

4.1 Receiver Front-End ........................................................................................1-6

4.2 Receiver Back-End.........................................................................................1-7

5.0 Frequency Generation Circuit ..............................................................................1-8

5.1 Synthesizer.....................................................................................................1-9

5.2 Voltage Controlled Oscillator (VCO).............................................................1-10

6.0 Voice Storage (GP1280 Only) ...........................................................................1-12

Chapter 2 TROUBLESHOOTING CHARTS

1.0 Troubleshooting Flow Chart for Receiver (All models except those with PCB

8486686Z02) (Sheet 1 of 2).................................................................................2-1

2.0 Troubleshooting Flow Chart for Receiver (All models except those with PCB

8486686Z02)(Sheet 2 of 2)..................................................................................2-2

3.0 Troubleshooting Flow Chart for Receiver (Models with PCB 8486686Z02)

(Sheet 1 of 2) .......................................................................................................2-3

4.0 Troubleshooting Flow Chart for Receiver (Models with PCB 8486686Z02)

(Sheet 2 of 2) .......................................................................................................2-4

5.0 Troubleshooting Flow Chart for Transmitter ........................................................2-5

6.0 Troubleshooting Flow Chart for Synthesizer........................................................2-6

7.0 Troubleshooting Flow Chart for VCO...................................................................2-7

8.0 Troubleshooting Flow Chart for Receive Message/Personal Memo Recording ..2-8

9.0 Troubleshooting Flow Chart for Message Playback ............................................2-9

Chapter 3 UHF2 PCB/SCHEMATICS/PARTS LISTS

1.0 Allocation of Schematics and Circuit Boards .......................................................3-1

1.1 Controller Circuits ...........................................................................................3-1

1.2 Voice Storage Facility.....................................................................................3-1

2.0 UHF2 PCB 8485641Z02 Schematics ..................................................................3-5

Motorola GP series Detailed Service Manual

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