30 Sep
2011
30 Sep
'11
4:09 a.m.
On 09/29/2011 04:16 PM, Dave McGuire wrote:
And the wires are not broken.
Allison
On 09/29/2011 02:30 PM, Chris Elmquist wrote:
> But it appears that my drive has some issues. I can command it to seek
> to a particular block, the motor spins up, advances the tape a small
> amount and then stops, at which point the drive returns an "END PACKET"
> with an error status of "motor stopped".
>
Look at the response packets for error information. Also what was the
command
as it may be an irrational command.
FYI: Dectape-II are nt generic tapes. they have DEC specific formatting
that must be there. Also make sure you have not gone off the end of the
tape.
usually the first program (on the 11)I run is one to re-tension the tapes.
ITs a seek to block 127 and back to block 0.
The motor is
free to turn... even with a tape installed and I've scoped
for usual things such as tach pulses coming back, etc. so the failure
is non-obvious at this point.
I did find that one of the tapes failed the first time the drive
tried to
move it. Broke the little belt inside just as I suspected might happen.
Moved on to another tape and that one is holding together so far.
More to investigate.
I believe there's an optical shaft encoder on the spindle motor of
the TU58. I'd check to see that the disk (which is paper-thin sheet
metal) and the opto interruptor aren't clogged up with dust bunnies,
then test the opto interruptor itself.
-Dave