26 Feb
2014
26 Feb
'14
10:52 a.m.
Missed this first time round.
Number two spins up but the initial seek emits a
sickening "klang" as the
voice coil drives hard to the limit (yes, the graticule lamp is working).
Any ideas?
It sounds (!) like a problem with the oprtical trasnducer (the thing the
the graticule lamp shines on) or the servo circuitry. What I would do is
disable the servo (red swtich on th amplifier PCB on top of the PSU), put
a folded imwipe between the heads and disable interlocks so the drive wil
lrun without a disk instaleld. Then move the carriage frowards by hand
wit hthe thing effectively spun up (the Kimwipe wil lavoid damaging the
heads) and look at the signals i nthe positioner servo circuit with a
'scope. Start wit hthe outputs of the transducer, see if all signals are
present and change as you move the carriage.
-tony