with an off the shelf part?I have to say I'm shocked to hear that optical encoders were made with light bulbs -- haven't LEDs been viable since at least the early 70's? Talk about planned obsolescence...
RE the poor quality caps -- it looks like the electrolytics are all NIC or Panasonic, not a no-name cap. Still, I've seen my share of balky electrolytics. I was just hoping someone had fixed this particular problem
before and could point to a likely component to try first. Scott Didier Juges wrote:
It is not clear from your post if you did that test while under power or not. This is probably a Rotary Optical Encoder. It may need 5V to power the LEDs or light bulb that activate opto-sensors, so you probably need power applied and use a scope to check the outputs. Also, some devices only generate short pulses on the outputs which will never show with a multimeter (I have aKenwood radio that does that), you would need a scope. If you do not get anything, it may be that the light bulb inside is dead.This is a common problem on HP gear of that vintage.Didier KO4BB
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