Adjusting Infinity IRS servo controller

I don't have any specific info on that Genesis servo, but based on my experience with the Infinity servo, I would suppose that one pot is gain and the other offset.  I adjusted mine for as close to zero dc bias as I could get and the the gain for unity.  You will have to try them to see which one does what.  You will also need access to an oscilloscope and probes.

For some reason the picture did not post.  Anyone know how?

I suppose it is possible that I made a mistake, but I had to re-calibrate my servo on a regular basis.  Those were the pots that used.  If you have access to a scope, it would be easy to verify.  I'm pretty sure I gave the schematic to the new owner, so I have nothing else to compare.  Also, I ended up replacing all the electrolytic capacitors in it.  As I mentioned, all this was back around 2010, so I don't recall any more details.  If I come across anything else in the next few days, Ill let you know.

If memory serves, I adjusted mine for unity gain.  After I noticed that I needed to continue to make adjustments, I started keeping a log book to track it.  Maybe I can find it, but I threw out a lot paper before my last move, so we'll see.

I had the IRS Gammas.  Sold them back in 2010.  I did a fair amount of work on the my servo controller plus another one (anybody remember Bobby Shred?), but since I am retired now I no longer have access to an electronics lab.

It may be possible to do this with a DMM.  Use DCV setting to adjust offset and ACV to adjust the gain.  Since you can only monitor gain or offset individually, it will be an iterative process.