Looking for docs / schematics for MITS 88-HDSK and its associated Pertec drive

Hey all -- I'm assisting in the restoration of an Altair 8800 system which includes the MITS 88-HDSK ("Altair Hard Drive Controller") and Pertec D-3422 removable pack/fixed platter drive and after cleaning everything up, rebuilding supplies, etc, the drive spins up and goes Ready but all attempts to boot end in "LOAD ERROR: 1" which I have been told indicates that the Altair doesn't think the drive is ready. I can't find any substantial documentation on the controller (the D-3400 series is covered on bitsavers); I've checked with the Altair Computer Club and they don't have any docs posted (and the one guy who might have a copy of the docs is on vacation until the 12th, which wouldn't normally be a big deal but we're trying (perhaps in vain) to get this thing ready for an event on Saturday...). Anyone have any docs or any other information for the 88-HDISK controller? Thanks! Josh