Thanks for all the suggestions about solving our problems with
communication between our Sun computer and Unity console. It turns
out we are not the only ones who have sometimes relied on magic
incantations to make this work. Most of the suggestions involved
checking power supplies either in the diff box (two of our four had
bad ones; all had connectors with various degrees of discoloration)
or the console (all those we found seemed fine). Also checking for
proper scsi termination, though there is a lot of uncertainty about
exactly what that should be.
The solution in our case was replacing the acquisiton cpu board.
That finally got us running, though it does not appear to be a very
robust configuration, being sensitive to termination at the diff
box. It would be interesting to explore a little the range of
permissible configurations (internal/external/passive/active/perfect),
but given the panic our dead instrument was creating among the
faculty as the new semester starts up, we are planning to follow
the advice of our service engineer: If it's running, don't turn it
off unless the world is ending.
A potentially longer term fix for us would be to convert an INOVA 300
console into a 200 console. Does anyone have an INOVA 200 lock
transceiver and lock preamp that they aren't using? Agilent does not have
these parts anymore.
--
Steve Philson philson_at_nmr.chem.umn.edu
NMR Lab Wizard & Dance Consultant 612-626-0297
Department of Chemistry University of Minnesota
Received on Wed Jan 22 2014 - 08:32:34 MST