HEIDENHAIN ND 1300 OED and Crosshair Systems - Manual (Page 241)

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Problem Solving
Optical edge detection is not working properly
Probable cause 1: Reference or sensor light levels are incorrect
Possible solution:
1 Refer to Evaluating optical light levels in Chapter 10: Setup for instructions regarding
light levels, and then reorient, repair or replace light sources or optical cables.
Probable cause 2: Edge detection is not calibrated:
Possible solution:
1 Perform a Teach operation or a Distance Cal using the Magnifications Setup screen.
Probable cause 3: Edge detector and crosshair probes are not
cross-calibrated:
Possible solution:
1 Perform a Cross Cal using the Magnifications Setup screen.
Probable cause 4: Multiple system magnifications are not
calibrated to be parcentric:
Possible solution:
1 Perform a Parcentric calibration using the Magnifications Setup screen.
Symptoms, Probable Causes & Solutions