HP-IL device Seal s5801c

[ijabbott]

(02-06-2021 02:05 AM)Paul Berger (Canada) Wrote:  Well it says it is an AC motor controller so my guess would be that the two TO-220 parts bolted to the heatsink are triac. Looking from the back the two Rifa caps and the two white ones behind them look like they are X & Y safety caps and should be marked as such. X caps are typically across the two AC lines and Y caps from the lines to ground The two toroids behind would probably be filters in line with the two legs of an AC feed so you should be able to figure out where the AC connections are.

It would be a good idea to remove or replace those RIFA caps before connecting it to the AC mains. They don't age well.