HP-IL device Seal s5801c

[Paul Berger (Canada)]

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. They grey blob is probably a transformer and may even be marked, but I suspect the primary side is next to the toroids. There looks to be 4 diodes on the other side for a full wave rectifier with a couple fairly large electrolytic caps next to them rated for 16V. Perhaps one of the TO-220 devices is a 5V regulator.

If you can figure out the AC input I would probably start with 110V and see if you get +5V across the power pins of the HPIL chip as per Dave's post earlier. If you have a variac available you could even start with a lower AC input voltage and then raise it until you get something reasonable on the DC side.

This would get you top the point of powering the thing up but probably the only way to figure out how it works would be to dump and reverse engineer the ROM of the 6811, I don't think the 6811 had protection.

Paul.