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AT550
Reichert AT550 Service Manual
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13900-103 Rev. A
Page 7
Figure OP-1. Alignment System
Theory of Operation (
Continued
)
Control
Bd.
V
ideo
Bd.
Display
Bd.
I/OB
d
.
Display
Control
Bus
L.
V
ideo
L.
LED
Driver
R.
LED
Driver
1
Surface
Mirror
st
IR
Pass
Filter
Position
LED
Camera
Eye
Position
LED
*
Arrow
direction
showing
infrared
LED
light
path
Spacer
Lens
Position
Lens
Motor
Bd.
Motor
Status
Motor
Stops
I/OB
u
s
I2C
Bus
I/OB
u
s
R.
Data
V
alid
Pos.
Camera
Set
L.
Data
V
alid
I2C
Bus
I2C
Bus
R.
V
ideo
I2C
Bus
6
8
Table of Contents
Table of Contents
2
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
Repair
6
Air Puff System
8
Applanation System
8
Proximity Detector
8
Target Illuminator
8
Touch Sensor
8
Troubleshooting
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 1
34
Printer Replacement
35
Repair 3
35
Power I/O Circuit Board Replacement
36
Repair 4
36
Control Circuit Board Replacement
37
LCD Screen Replacement
38
Repair 6
38
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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Reichert AT550 Specifications
General
Brand
Reichert
Model
AT550
Category
Measuring Instruments
Language
English
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