Table Of Contents - Motorola CDM1550 LS+ Detailed Service Manual

Table of Contents
Product Safety and RF Exposure Compliance .. .. ................ ...
vii
Chapter 1 Introduction
1.1 ScopeofManual ....................................... ..................... ............................. .. .... ... 1-1
1.2 Warranty and Service Support.. ................ .................... ...... ................... ... .. ......... 1-1
1.2.1 Warranty Period ........................... ......... ..... ... .. ..... ..... ... ... ............ ....... .. .. 1-1
1.2.2 Return Instructions ...................... .................. .. .. ................... ....... ....... .... 1-1
1.2.3 After Warranty Period .................. ................... .. ........... .. ...... .. ..... .. ..... .. .. 1-1
1.3 Related Documents .................................... .................. .... .. .... ... ...... .. ...... ........ ... . 1-2
1.4 Technical Support ........................................................ ... ........... ...................... .... 1-2
1.5 Warranty and Repairs ................................................... ..... ...................... .... .. .. ... . 1-2
1.6 Radio Model Chart and Specifications ...... .................... .... ... ................................ 1-3
1.7 Radio Modellnformation ............................................. .. .. ................... ............. .. ... 1-3
Chapter 2 Theory of Operation
2.1 Overview ........................................................................ ............ ......... ............... .. 2-1
2.2 Controller ..................................... .................. ... .. ....... ... .. ........... .. ............. .... ... .... 2-1
2.2.1 Radio Power Distribution .. ... .... ..... .. .............................. .. .............. .. .. ... .. 2-2
2.2.2 Automatic On/Off ........... ...... ......................... .. ..... ................ ................ .. 2-3
2.2.3 Emergency ........................................................ ... ........ .. .. .... ..... .. .... ... .... 2-4
2.2.4 Mechanical On/Off ....................................... ..... ......... ...................... .... .. 2-4
2.2.5 Ignition ... ... ... ... ......... .................................... .................. ........ ...... ...... .... 2-4
2.2.6 Microprocessor Clock Synthesizer ....... .. ..... .. ...... ......... .. ...... .. ..... .... ..... .. 2-5
2.2.7 Serial Peripheral Interface (SPI) ............... ..... ........... .... ................ ... .. .... 2-5
2.2.8 SBEP Serial Interface ............... .......................... ... ................................ 2-6
2.2.9 General Purpose lnpuUOutput .. .......... .. ...................... ... ...... .. ...... ... ....... 2-6
2.2.1 0 Normal Microprocessor Operation ................... .. ....... ... ........... ... .. .. .. ...... 2-7
2.2.11 Static Random Access Memory (SRAM) ...... .. ...... ... .. ... ......................... 2-8
2.3 Controller Board Audio and Signalling Circuits .... ............................. .... ........... .. .. 2-8
2.3.1 Audio Signalling Filter IC with Compander (ASFIC CMP) ..................... 2-8
2.3.2 Transmit Audio Circuits .......................................................... .. ........... ... 2-9
2.3.3 Microphone Input Path ........................... ........ ........ ... ..... ...... .... .... ....... ... 2-9
2.3.3.1 PTT Sensing and TX Audio Processing .....
.. ....... .. .. ................ 2-10
2.3.3.2 TX Secure Audio (optional) .................... ........ .. .... ..... .. ............ 2-10
2.3.3.3 Option Board Transmit Audio .................. ......... .. ....... ..... .... ..... 2-10
2.3.4 Transmit Signalling Circuits ..................................... .......... ........ ..... ... .. 2-11
2.3.4.1 Sub-Audible Data (PL/DPL) ............. ...................................... . 2-11
2.3.4.2 High Speed Data ................ .......................... .. ... ............. .. ....... 2-12