I have a VUK opto that isn't working right. It always shows the beam as being blocked, even when it isn't. I tested the receiver opto with a flashlight and it seems to be working fine. I would assume that this means the emitter is bad, but I can see that it's on when I look at it. Two questions:
1) Does it matter if you can see a bright red light coming out of the emitter LED? Should it be only visible with a digital camera?
2) If you can see a bright red light, does that mean that the reciever should be picking up the signal?