henry@utzoo.UUCP (Henry Spencer) (01/25/84)
Yesterday, in the course of PMI checking our packs (basically ok, although
the head-load areas were a bit dirty), it was discovered that the door
latch on drive B (the production drive) wasn't working. It transpired
that a fuse had blown in B. Fuse replaced, drive spins up ok, shut it
down and the fuse has blown again. Fuse replaced again and drive put
back into production. Terabit was planning to come in today anyway for
PM, so no great problem.
It turned out that the door-latch solenoid on B had failed in some nasty
manner that was shorting the power supply and blowing the fuse. Matt
took the solenoid from drive A and moved it to B, intending to get a
new one ASAP and put it on A. Fine. But...
When he tried to get B up again, it misbehaved severely. After lengthy
investigation, it turned out that B's tachometer rod had shattered (!!).
Just as well that this didn't happen during production operation. The
local Terabit office does not have a spare tach rod on hand, so they
are ordering one; it may be a day or two. To get things running again
in the mean time, we have moved pack UNIXA6 to drive A and are running
production there for the moment. Matt has rearranged door solenoids
etc so that A is fully operational. It seems to be behaving properly.
--
Henry Spencer @ U of Toronto Zoology
{allegra,ihnp4,linus,decvax}!utzoo!henry