M A I N T E N A N C E PAGE 19
Last printed 1/31/2012 4:04:00 PM
Version Rev. 2003D-0
Checking the Aim of a Photo-Eye
1. Press (RST/ENT) button on the tumbler timer. This will supply power to the photo-
eyes, which will be indicated by a red light on at the back of the timer. (If they do
not come on, the photo-eye might be out of alignment.)
2. Take a piece of masking tape and cover up the reflector. Only the one reflector that
is opposite of the photo-eye that you are checking.
3. Use a reflector for checking the sensing range of the photo-eye. Take this reflector
and hold it over the reflector that you taped up.
A. Move the reflector to the left until the red light on the photo-eye goes out,
measure this distance (see Figure "A"), which we will call distance "A."
B. Move the reflector to the right until the red light on the photo-eye goes out,
measure this distance (see Figure "A"), which we will call distance "B."
C. Move the reflector up until the red light on the photo-eye goes out, measure
this distance (see Figure "A"), which we will call distance "C."
D. Move the reflector down until the red light on the photo-eye goes out, measure
this distance (see Figure "A"), which we will call Distance "D."
4. Distance "A" and "B" should be about the same and "C" and "D" should be about the
same. If measurement "A" and "B" are not equal and "C" and "D" are not equal the
photo-eye aim needs to be adjusted (refer to Adjusting the Aim of the Photo-Eye).
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