Motorola PM1200 Basic Service Manual page 8

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2.2.2.2
2.2.3 General Radio Care and Handling Precautions............................................................... 2-2
2.2.4 RF Power Amplifier (RF PA) Heatsinking ........................................................................ 2-2
2.3 Handling Precautions ................................................................................................................... 2-2
Chapter 3 Basic Theory of Operation ................................................. 3-1
3.1 Introduction .................................................................................................................................. 3-1
3.2 General Overview ........................................................................................................................ 3-1
3.3 Controller Section ........................................................................................................................ 3-2
3.3.1 Introduction ...................................................................................................................... 3-2
3.3.2 Surrounding Controller Region ........................................................................................ 3-2
3.3.2.1
3.3.2.2
3.3.2.3
3.4 Control Head Assembly ............................................................................................................... 3-3
3.4.1 Controller ......................................................................................................................... 3-3
3.4.2 Power Management (Power Control Microcontroller and Voltage Regulators) ............... 3-3
3.4.2.1
3.4.3 User Interface (Keypad, STN Display, Volume Selector Knob, Microphone and
Speaker) section.............................................................................................................. 3-3
3.4.3.1
3.4.3.2
3.4.3.3
3.4.3.4
3.4.3.5
3.5 Analog Mode of Operation ........................................................................................................... 3-4
3.5.1 General ............................................................................................................................ 3-4
3.5.2 Receive Operation ........................................................................................................... 3-4
3.5.3 Transmit Operation .......................................................................................................... 3-5
3.6 Radio-Frequency Power Amplifier (RF PA) and Output Network (ON) ....................................... 3-5
3.6.1 Gain Stages ..................................................................................................................... 3-6
3.6.2 Circuit Protection ............................................................................................................. 3-6
3.6.3 DC Interconnect............................................................................................................... 3-6
3.6.4 DCS Demodulator............................................................................................................ 3-6
3.6.5 CTCSS encoder/decoder................................................................................................. 3-6
3.6.6 MPU................................................................................................................................. 3-6
3.6.7 EEPROM ......................................................................................................................... 3-6
3.7 PLL Synthesizer........................................................................................................................... 3-7
Chapter 4 Test Equipment, Service Aids, and Tools......................... 4-1
4.1 Recommended Test Equipment .................................................................................................. 4-1
4.2 Service Aids and Recommended Tools ....................................................................................... 4-2
4.3 Field Programming Equipment .................................................................................................... 4-3
4.3.1 PM1200 Field Programming ............................................................................................ 4-3
4.3.1.1
Chapter 5 Radio Alignment and Programming Procedures ............. 5-1
5.1 Introduction of Radio Alignment Procedures ............................................................................... 5-1
5.2 Required Test Equipment ............................................................................................................ 5-2
October 26, 2007
Cleaning Internal Circuit Boards and Components........................................... 2-2
Introduction ....................................................................................................... 3-2
Voltage Regulation ........................................................................................... 3-2
Emergency........................................................................................................ 3-2
Voltage Regulators ........................................................................................... 3-3
Display .............................................................................................................. 3-3
Keypad and Volume Selector Knob .................................................................. 3-3
Telco Connector ............................................................................................... 3-3
Emergency Microphone.................................................................................... 3-3
Internal Speaker ............................................................................................... 3-3
Field-Programming Items ................................................................................. 4-3
Table of Contents
6880309U09-A