Chapter 2: i
6881091C63-A
Chapter 2: Control Head Service Information
Table of Contents
Section 1 Overview
1.0 CDM750 / PRO3100 Model (GCN6112_).........................................................2:1-1
2.0 CDM1250 / PRO5100 Model (GCN6113_).......................................................2:1-1
3.0 CDM1550 Series / PRO7100 Model (GCN6114_)............................................2:1-2
Section 2 Theory of Operation
1.0 Introduction .......................................................................................................2:2-1
2.0 Control Head (CDM750 / PRO3100) ................................................................2:2-1
2.1 Power Supplies............................................................................................2:2-1
2.2 Power On/Off...............................................................................................2:2-1
2.3 Microprocessor Circuit.................................................................................2:2-1
2.4 SBEP Serial Interface..................................................................................2:2-2
2.5 Keypad Keys ...............................................................................................2:2-2
2.6 Status LED and Back Light Circuit...............................................................2:2-3
2.7 Microphone Connector Signals ...................................................................2:2-3
2.8 Speaker .......................................................................................................2:2-3
2.9 Electrostatic Transient Protection ................................................................2:2-4
3.0 Control Head (CDM1250 / PRO5100 / CDM1550 Series / PRO7100) .............2:2-4
3.1 Power Supplies............................................................................................2:2-4
3.2 Power On/Off...............................................................................................2:2-4
3.3 Microprocessor Circuit.................................................................................2:2-4
3.4 SBEP Serial Interface..................................................................................2:2-5
3.5 Keypad Keys ...............................................................................................2:2-5
3.6 Status LED and Back Light Circuit ..............................................................2:2-6
3.7 Liquid Crystal Display (LCD) .......................................................................2:2-6
3.8 Microphone Connector Signals ...................................................................2:2-7
3.9 Speaker .......................................................................................................2:2-7
3.10 Electrostatic Transient Protection................................................................2:2-7
3.11 PassPort Trunking Controller Board (PTCB)...............................................2:2-8
Section 3 Troubleshooting Charts
1.0 Control Head CDM750 / PRO3100 Troubleshooting Flow Charts....................2:3-1
1.1 Troubleshooting Flow Chart for On/Off........................................................2:3-1
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