15 Feb
2020
15 Feb
'20
10:47 a.m.
On Sat, Feb 15, 2020, 13:38 Chuck Guzis via cctalk <cctalk at classiccmp.org wrote:
On 2/12/20 4:49 AM, Patrick Finnegan via cctalk
wrote:
After more diagnosis, it looks like they're TTL level output photo
detectors. They have the same looking part for the write protect notch,
though that one isn't stuck high.
I'm not sure why the index sensors on both are broken, but not the write
protect notch sensors. Hopefully once the replacements arrive, replacing
that will fix the drives. The drives look pristine on the inside.
Pat
I've got a couple of Teac FD-54B's that
appear to have problems with
their
index sensors. Does anyone have any docs for
these? The internet seems to
barely know they exist vs the FD-55, which has info everywhere. I'm
thrown
off a bit by the 3 wire phototransistor (vs the
common 2 wire ones) they
they use, and I haven't quite disassembled it enough to figure out a
part #
for that.
Herb Johnson (retrotechnology) has a service manual; also look in the
Tandy 1000 service manual--ISTR that there's an FD54 techref buried
somewhere in the middle of that thing.