Just when you think you are riding high and taking no prisoners. (Yea, I shoulda known) I have discovered a fatal error on my XF551 boards. I believe it affects both versions, modern and original.*
It’s not that it can’t be fixed, but it’s the loss of trust and extra expense I hadn’t counted on that’s going to hurt me most. Not to mention the hassle to my customers. I have posted on AtariAge.com and will try to send notification to those who have purchased via the email used when they purchased.
Any new boards sold will include the fix.
*Update….. At this time it seems to be only affecting the original power supply boards. Possibly a consequence of the anemic power supply design for the original Atari XF551. Anyway some people are reporting the problem, others are not having a problem. To date noone has reported the problem with the modern power supply model.