Teac FD-55B Floppy Oddity

From: John Chris Wren <jcwren_at_jcwren.com>
Date: Tue Feb 26 19:50:19 2002

        My Otronas have FD-55B-01-U drives in them. I thought the drives were
fried, since they wouldn't work on the Otrona nor on the PC, but in dinking
around, I determined that on at least one drive (and probably the other),
the head load solenoid is not pulling in. I see power being applied, but it
only looks like +5V.

        I don't have schematics, and I'm not ready to risk wrecking the drives
determining the following question: Should the solenoids pull in on +5 or
+12? If I'm seeing +5, I suspect the solenoid driver transistor could be
cooked. The solenoid coil is intact, as I'm seeing 44 ohms across it, out
of circuit. In either case, I don't feel even the lightest twitch when it's
supposed to pull in (and the jumper is in place, for load on motor select).

        Does anyone have any FD-55B (these are the 360K DS-DD 48 TPI) drives they'd
like to part with, either to see an Otrona running, or in exchange for ye
olde green stuffe?

        --John
Received on Tue Feb 26 2002 - 19:50:19 GMT

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