Encoder

Apr 04, 2009 3 Replies
R

I ripped apart an HP printer and on the back of the carraige that the moved the print heads around was an encoder and a 400 LPI encoder strip. The encoder is labeled H9721P. I can not find a datasheet for it, but there are only 4 pins. I'm guessing one is power, another is ground, then two sensor outputs. I'm curious if the is any way to determine what pins are what?



formatting link
formatting link



It looks like C2 connects pin 2 to pin 4 (if you count the pins from left to right as viewed on the "front" image)



TIA!


Vote
Twitter Facebook LinkedIn
N

By convention pin 1 often has a square pad. Is your pin 1 really pin 1?

Vote
Twitter Facebook LinkedIn
A

formatting link

Well, the capacitor that goes to what you think is pin 2 would suggest it's the power pin. The other side of the cap would be ground, now you can beep it out. Or just apply power to the board and measure it. Or find a conventional IC on the board and measure it. So many ways.

Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required