We've repaired a bunch of these for the 38400 2K machines, mostly with malfunctioning displays. We can get new displays if yours is cracked. Robinaire P/N is RA19740 for the 34800-2K but I get the impression that the board may be used on other models by loading different firmware. Stickers on the boards say RA799-I1827, it is called a 'Multi Purpose Control Board'

We've repaired dozens of these, the most common problem is that the display has failed or been broken. We have found a source for new displays that require only a slight modification of the control board to work. The result is a crisp clean display and a fully functioning board.

The boards is marked 175-0097-01 and the Robinair P/N is RA19606A. There is a fairly common problem with these that leaves them stuck in a programming loop that displays "Initializing" we can repair this and get them working.