13900-103 Rev. A Page 13
Miscellaneous System Errors (Continued)
Definition Probable Cause Solution
Does Not Find ... (Continued) .................... External light confusing positioning system. Isolate sources of external light
(incandescent and/or infrared) and
remove light source.
Finds one eye not the other ...................... Light interference on measuring side Remove interference
Infrared interference (infrared light source).
Tries three times to find the eye............... Proximity detector is activated. Eliminate touching end of nosepiece.
Proximity Detector Replace detector circuit.
Will Not Take a Reading ............................ Patient not holding still. Encourage patient to remain still.
Patient’s eye too far from Patient Window. Have patient move toward nosepiece.
Patient not focusing on target (eye Have patient look only at target.
moving around).
Patient has dry eye. Have patient blink eyes
Asterisk Readings ....................................... Unit needs reboot of hardware. Unplug unit, wait 10 seconds the
apply input power.
Dirty position alignment windows. Clean the positioning windows as
indicated in the
Cleaning section.
Unit out of alignment. Perform the Calibration procedure
as indicated in this manual.
Loose lenses in the VVL lens cell Install a new lens cell.
No Applanation Readings ......................... J7,J8 (Fig.7,7) Disc’d or reversed. Attach connector.
Unit much out of alignment. Perform the Calibration procedure
as indicated in this manual.
Piston not working. Check connection at J13 (Fig.7,7).
Replace defective piston/solenoid.
Printer Not Printing ..................................... Printer out of paper. Replace paper with P/N 12441.
Cables not connected. Re-attach J10 and/or J12 (Fig.7,27).
Printer not printing characters Replace print head (P/N 13963-401).
Troubleshooting (Continued)
Quick Reference Guide
Fig.7,7 = 13900-851 Optical Head Assy
Fig.7,16 = 13960-924 Motor Board Assy
Fig.7,27 = 13960-925 Power I/O Board
Fig.7,31 = 13900-921 Control Board Assy
Disc’d = Disconnected or intermittent connections. Check
crimp joints and continuity from pin to pin.
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