Motorola MCS 2000 Service Instructions

vi Table of Contents
December 6, 2004 68P81083C20-D
Receive Signalling Circuits ............................................................................................................. 24
Chapter 8 Control Heads...................................................................... 8-1
Model I........................................................................................................................................................ 1
Introduction ....................................................................................................................................... 1
Power supplies.................................................................................................................................. 1
Audio configuration ........................................................................................................................... 1
Volume Control / on-off..................................................................................................................... 1
Micro-controller ................................................................................................................................. 1
Xtal Oscillator.................................................................................................................................... 1
LCD................................................................................................................................................... 2
Keypad.............................................................................................................................................. 2
Mode Select...................................................................................................................................... 2
Multiplexer Operation........................................................................................................................ 2
Models II and III .......................................................................................................................................... 3
Introduction ....................................................................................................................................... 3
Power Supplies................................................................................................................................. 3
Audio Configuration .......................................................................................................................... 4
Volume Control/On-Off ..................................................................................................................... 4
Micro-controller ................................................................................................................................. 4
Xtal Oscillator.................................................................................................................................... 4
LCD................................................................................................................................................... 4
Keypad.............................................................................................................................................. 5
Rotary Switch.................................................................................................................................... 5
Mode Select...................................................................................................................................... 5
Chapter 9 Troubleshooting.................................................................. 9-1
Troubleshooting Charts Overview .............................................................................................................. 1
Troubleshooting Chart 1-1, Overall Radio .................................................................................................. 2
Troubleshooting Chart 1-2 (1 of 3), Failure Codes ..................................................................................... 3
Troubleshooting Chart 1-2 (2 of 3), Failure Codes ..................................................................................... 4
Troubleshooting Chart 1-2 (3 of 3), Failure Codes ..................................................................................... 5
Troubleshooting Chart 1-3, On/Off Circuit .................................................................................................. 6
Troubleshooting Chart 1-4, TX Audio ........................................................................................................ 7
TX Audio Routing, Simplified Schematic for Chart 1-4............................................................................... 8
Troubleshooting Chart 1-5, RX Audio......................................................................................................... 9
RX Audio Routing, Simplified Schematic for Chart 1-5............................................................................. 10
Troubleshooting Chart 1-6, Signalling ...................................................................................................... 11
Troubleshooting Chart 1-7, DC Distribution ............................................................................................. 12
Radio Voltage, Simplified Schematic For Chart 1-7 ................................................................................. 13
Troubleshooting Chart 1-8A, Control Head Model I.................................................................................. 14
Control Head I Troubleshooting Procedure .................................................................................... 15
Troubleshooting Chart 1-8B, Control Head Models II & III ....................................................................... 20
Control Heads II and III Troubleshooting Procedure....................................................................... 21
Troubleshooting Chart 1-9, Clock Distribution.......................................................................................... 26
Troubleshooting Chart 1-10, SB9600 BUS RX......................................................................................... 27
Troubleshooting Chart 1-11, SB9600 BUS RX......................................................................................... 28
SB9600 Voltage Table for Charts 1-10 & 1-11 ......................................................................................... 28
SB9600 BUSY, Simplified Schematic for Charts 1-10 & 1-11 .................................................................. 29
SB9600, Simplified Schematic for Charts 1-10 & 1-11.............................................................................29

Motorola MCS 2000 Specifications

General

Brand	Motorola
Model	MCS 2000
Category	Radio
Language	English