I noticed that there is no copy on bitsavers of the Konan Corp "The DJ 210"
SASI Controller OEM Reference Manual so I posted one on my web site:
https://www.vintagecomputer.net/cisc367/Konan_The_DJ_210_SASI.pdf
I am not 100% sure, but if I was to guess this info could be applied to
repairs for Tandy's and other 5MB hard drives of the era that used the
ST506/412 and maybe the Tandon 603S (?) You be the judge, I am not an
expert.
Bill
kennettclassic.com