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| Sony 2MB MP-F75W Floppy Schematics ... |
Posted by: franklyn on 2026-04-23 11:16:41
Looking for the schematics from a Sony 2MB Floppy from a Macintosh IIcx ...
The Floppy works fine but the ejector motor isn't running. It's not the gearbox or its plastic gears in it. |
Posted by: Callan on 2026-04-23 12:45:01
Check the drive transistor on the underside of the floppy (b7). It'll be close to the plug going to the eject mech. I had this same issue with one of my drives and this was what caused it.
You can find a copy of the schematics in the se/30 schematics done by bomarc. |
Posted by: franklyn on 2026-04-23 21:37:48
You can find a copy of the schematics in the se/30 schematics done by bomarc. ... thanks but I can not find it. |
Posted by: Callan on 2026-04-23 22:02:53
It's on page 8. Here's a pic of it, and here is a link to the full bomarc se/30 schematics.
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Posted by: franklyn on 2026-04-23 22:25:50
Thanks |
Posted by: franklyn on 2026-04-24 11:02:40
The schematic isn't quite accurate, because on my floppy drive, it isn't transistor Q7 that controls the eject motor, but rather Q9... |
Posted by: Callan on 2026-04-24 12:02:17
Did it fix it? |
Posted by: franklyn on 2026-04-25 04:44:20
The Q9 transistor is ok. I must test more, I will see the Eject signal comes from Pin9 of the Floppy connector ... |
Posted by: franklyn on 2026-04-27 23:12:54
The circuit diagram is correct. Is there a list of replacement SMD transistors (EU types) for the original types? They must, of course, have the same pinout.
I destroyed the Q9 while trying to control it manually and replaced it with a BC557 for testing purposes.There's an internal switch in the ejection motor unit; could that be my problem? |
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