Motorola MCS 2000 Service Instructions

Table of Contents v
68P81083C20-D December 6, 2004
Reassembly of the Control Head.............................................................................................................. 12
Model I............................................................................................................................................ 12
Models II and III .............................................................................................................................. 12
Transceiver Reassembly Low and Mid Power Models............................................................................. 12
Transceiver Reassembly ................................................................................................................ 12
Assembly of Control Head to Transceiver ...................................................................................... 15
Dash Mount Models....................................................................................................................... 15
Remote Mount Models.................................................................................................................... 15
Transceiver Reassembly High Power Models.......................................................................................... 16
Replaceable Pushbuttons Replacement Procedure................................................................................. 19
Models II & III.................................................................................................................................. 19
Chapter 6 Radio Tuning Procedure .................................................... 6-1
General....................................................................................................................................................... 1
Tuning Procedure....................................................................................................................................... 3
Reference Oscillator Alignment ........................................................................................................ 3
Transmitter Power ............................................................................................................................ 3
Transmit Current Limit ...................................................................................................................... 5
Transmit Deviation Balance (Compensation) ................................................................................... 6
Transmit Deviation Limit ................................................................................................................... 7
Transmit Deviation Limit Reference.................................................................................................. 7
Signaling Deviation........................................................................................................................... 8
Rated Audio.................................................................................................................................... 10
Front-End Pre-Selector................................................................................................................... 10
Chapter 7 Controller Section Theory of Operation............................ 7-1
Introduction................................................................................................................................................. 1
Theory Overview ........................................................................................................................................ 1
Voltage Regulation ..................................................................................................................................... 2
Voltage Regulators ........................................................................................................................... 2
Electronic On/Off .............................................................................................................................. 2
Emergency........................................................................................................................................ 3
Mechanical On/Off............................................................................................................................ 3
Ignition .............................................................................................................................................. 4
Power Control............................................................................................................................................. 7
Protection features............................................................................................................................ 8
Interfacing................................................................................................................................................... 9
Microprocessor Clock Synthesizer ................................................................................................... 9
Serial Peripheral Interface (SPI)..................................................................................................... 10
SB9600 Serial Interface............................................................................................................................ 11
General Purpose Input/Output........................................................................................................ 12
MicroprocessorOperation ......................................................................................................................... 12
Normal (=Expanded) Microprocessor Operation ............................................................................ 12
Bootstrap Microprocessor Operation..............................................................................................16
Audio and Signalling Circuits.................................................................................................................... 16
Audio Signalling Filter IC (ASFIC) .................................................................................................. 16
Audio Ground.................................................................................................................................. 16
Transmit Audio Circuits................................................................................................................... 17
Transmit Signalling Circuits ............................................................................................................ 19
Receive Audio Circuits.................................................................................................................... 21

Motorola MCS 2000 Specifications

General

Brand	Motorola
Model	MCS 2000
Category	Radio
Language	English