3 Jul
2007
3 Jul
'07
3:34 p.m.
Tony Duell wrote:
Yep... I just wondered if the pulleys were deliberately shimmed to allow a bit
of fine tuning either way or something. It's not really that big a deal - I'd
just rather a belt that didn't drag at all just to keep wear as low as I can.
True. I don't remember the manual I was looking at for sure - I think it was
"Guide to PNX" or somesuch, big thing about an inch thick. It mentioned
'bye'
and 'shutdown' (in tandem with issuing a kill) in the same paragraph but
wasn't too clear on what exactly did what.
I think I'm just too used to newer UNIX systems that take a few minutes to
shutdown, so the couple of seconds or so of the PERQ just seemed way too fast :-)
Yep. I made a fuss about it a while ago when we needed to move our other PERQ
1 :-)
1) The hard
disk (Shugart SA4008) drive belt seems to have a habit of
running 1mm or so out of line at startup, resulting in it rubbing against the
chassis beneath the spindle pulley. Once it picks up speed it sorts itself
out, but I was wondering whether there's any adjustment in either the spindle
pulley or drive motor in order to get it to run a little better?
IIRC those pulleys are 'crowned' -- that is they are convex. The belt
will run towards the edge when it's running slowly, and will come to the
middle when it's up to speed. I don't know of anything you can do about
this. Maybe fiddle with the motor position, but.... The SA4000 service manual that I have has full
schematics and PCB layouts
but nothing on the mechanical side at all.
There's probably a Hoover manual somewhere covering the mechanical side ;)
3) Shutdown
procedure - is 'bye' sufficient or do I need to be doing
something else first? The manual's a little ambiguous on this (and 'bye'
alone
executes so unbelievably quickly that it made me worry it wasn't correctly
flushing files, parking heads etc.)
I always did sync 3 times before bye. It can't hurt. bye will park the heads on a PERQ1 (or 1A), but puts
them in totally the
wrong place on later machines (!).
Ouch. Yes, I think I've read that somewhere before (probably on here!)
(I seriously
love that hard disk - it's got a wonderful backyard-engineering
made-from-washing-machine-parts feel to it :-)
It is rather fun. I assume you know to lock the positioner and the
spindle before moving the machine.