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Table of Contents
Chapter 1 OVERVIEW
1.0 CM200 Model.......................................................................................................1-1
2.0 CM300/PM400 Models ........................................................................................1-1
Chapter 2 THEORY OF OPERATION
1.0 Introduction ..........................................................................................................2-1
2.0 Control Head Model for CM200 ...........................................................................2-1
2.1 Power Supplies...............................................................................................2-1
2.2 SPI Interface...................................................................................................2-1
2.3 Keypad Keys ..................................................................................................2-2
2.4 Status LED’s and Back Light Circuit...............................................................2-2
2.5 Microphone Connector Signals ......................................................................2-2
2.6 Speaker ..........................................................................................................2-3
2.7 Electrostatic Transient Protection...................................................................2-3
3.0 Control Head Model for CM300/PM400...............................................................2-4
3.1 Power Supplies...............................................................................................2-4
3.2 SPI Interface...................................................................................................2-4
3.3 Keypad Keys ..................................................................................................2-5
3.4 LCD Driver......................................................................................................2-5
3.5 Status LED’s and Back Light Circuit...............................................................2-5
3.6 Microphone Connector Signals ......................................................................2-5
3.7 Speaker ..........................................................................................................2-6
3.8 Electrostatic Transient Protection...................................................................2-6
Chapter 3 TROUBLESHOOTING CHARTS
1.0 Control Head CM200 Troubleshooting Chart.......................................................3-1
1.1 Control Head Failure ......................................................................................3-1
1.2 Button/Tones Select Error (Page 1 of 2) ........................................................3-2
1.3 Button/Tones Select Error (Page 2 of 2) ........................................................3-3
2.0 Control Head CM300/PM400 Troubleshooting Chart ..........................................3-4
2.1 Control Head Failure ......................................................................................3-4
2.2 Button/Tones Select Error (Page 1 of 2) ........................................................3-5
2.3 Button/Tones Select Error (Page 2 of 2) ........................................................3-6
Chapter 4 CONTROL HEAD PCB / SCHEMATICS / PARTS LISTS
1.0 Allocation of Schematics and Circuit Boards .......................................................4-1
2.0 Control Head CM200 - PCB 8488998U01 / Schematics .....................................4-3
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