EVOS
™
XL Imaging System User Guide
35
Appendix A: Troubleshooting
Note:
For additional technical support, contact your local EVOS
™
distributor. If you do not have
your distributor information, you can look it up at the
thermofisher.com/evos
or contact Technical
Support (page 55).
Image quality issues
Problem
Possible solutions
Image is too dim (at higher
magnifications)
•
Set the phase annuli selector to the BF position.
•
Remove condenser slider, if one is in place.
Specks, dots, or blurs on image
•
Follow instructions under “Objective lens care” (page 33) to clean
objectives.
Uneven focus across screen
•
Position sample so that it lies flat on the stage; be sure the
sample’s thickness is even.
Difficulty focusing on
coverslipped sample on standard
slide
•
Place the slide so the coverslip is facing up (long working-distance
objectives require a thick optical substrate, and image best
through 1.0–1.5 mm of glass or plastic).
LCD screen is black
•
Click the LIGHT ON button (onscreen).
•
Move objective selection wheel so that light shines through
objective.
•
Verify that the phase annuli selector on condenser is not stuck
between settings.
•
Center sample over objective.
•
Verify power supply is connected and power switch is on.
LCD screen is red, or red patches
cover parts of the screen
•
Dim the illumination until the red highlights disappear to get the
maximum level of brightness without any overexposed areas.
•
Disable the “Highlight saturated pixels in red” option in the
Settings: Basic tab.
