Page 2 13900-103 Rev. A
Table of Contents
Introduction ...............................................................................................................................4
Reichert Assistance ................................................................................................................... 4
Warnings & Cautions .........................................................................................................................5
Theory of Operation ............................................................................................................................6
AT550 Introduction ......................................................................................................................6
Special Features of the AT550 .................................................................................................. 6
Positioning System Operation .................................................................................................. 6
Air Puff System ............................................................................................................................8
Applanation System. ..................................................................................................................8
Proximity Detector ......................................................................................................................8
Target Illuminator ........................................................................................................................ 8
Touch Sensor ...............................................................................................................................8
Trouble Shooting ............................................................................................................................. 10
Error Codes ................................................................................................................................ 10
Error Code Table ....................................................................................................................... 10
Miscellaneous System Errors ................................................................................................ 12
Testing ............................................................................................................................. 14
LCD Brightness Adjustment .................................................................................................... 15
LCD Contrast Adjustment ........................................................................................................ 15
Test Point Voltages ................................................................................................................... 16
Calibration ............................................................................................................................. 24
Pressure Delivery (Ramp) Calibration: ................................................................................. 25
Fixation Alignment .................................................................................................................... 25
Optical Alignment ..................................................................................................................... 26
Fire Around ................................................................................................................................ 27
Tonometer Alignment ............................................................................................................... 28
Applanation Gain Screen Figure ........................................................................................... 28
Rubber Eye Calibration ............................................................................................................ 29
Final Checks ............................................................................................................................... 30
Cleaning ............................................................................................................................. 31
Alignment Window Cleaning Procedure .............................................................................. 31
Air Tube Cleaning ...................................................................................................................... 31
External Cleaning Procedure ................................................................................................. 31
General Disassembly .......................................................................................................................32
Repairs ............................................................................................................................. 33
Repair 1 Nosepiece Cover Replacement..................................................................... 34
Repair 2 Printer Door Latch Replacement................................................................... 34
Repair 3 Printer Replacement ........................................................................................ 35
Repair 4 Power I/O Circuit Board Replacement ......................................................... 36
Repair 5 Control Circuit Board Replacement .............................................................. 37
Repair 6 LCD Screen Replacement ............................................................................... 38
Repair 7 Motor Board Replacement .............................................................................39
General Assembly ............................................................................................................................. 40
Appendix A Specifications, Transportation & Storage ................................................... 41
Appendix B Harness Connection List ................................................................................. 42
Appendix C Software Revision List ..................................................................................... 43
Ordering Information - Accessories ............................................................................................. 44
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