You're currently viewing posts by Pinsider pin_guy.
Click here to go back to viewing the entire thread.
The resistors drop ~11V across them and dissipate it as heat which is why they get hot. If half of your resistors are not getting hot than the opto transmitters associated with those resistors are not pulling any current which is why they are not working, best guess is you have a broken wire on the ground side of the circuit for those optos.
pasted_image (resized).pngQuoted from slochar:I replace the resistors with new ones and mount them up off the board a little bit to get some airflow underneath them.
I do the exact same thing whenever I have one on my bench, hard to tell from the image but the resistors are 3/32" off the board.
pasted_image (resized).pngYou're currently viewing posts by Pinsider pin_guy.
Click here to go back to viewing the entire thread.
Wanna join the discussion? Please sign in to reply to this topic.
Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!
This page was printed from https://pinside.com/pinball/forum/topic/wpc-16-opto-switch-board-hot?tu=pin_guy and we tried optimising it for printing. Some page elements may have been deliberately hidden.
Scan the QR code on the left to jump to the URL this document was printed from.
