Kodak EKTALITE E30 Manuel D'instructions page 8

Using the Projector
4. Adjust the PROJECTION LENS head angle to center the image on the
screen.
5. Turn the FOCUS KNOB until the projected image is sharp.
Should an orange or blue fringe appear around the outer edge of the
projected image, turn the COLOR FRINGE KNOB to clear it.
6. When the lamp is burned out, use the LAMP CHANGE HANDLE to
switch to new lamp.
The power is cutoff automatically during lamp change; switch power on
again after using lamp switch.
NOTE:
Remember to replace the old lamp with a new one before next use.
Do not remove lamp until it is completely cooled.
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KODAK EKTALITE E30/E31 OVERHEAD PROJECTORS