Sony 2MB MP-F75W Floppy Schematics ...

[franklyn]

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.

 

[Callan]

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.

 

[franklyn]

You can find a copy of the schematics in the se/30 schematics done by bomarc.

... thanks but I can not find it.

 

[Callan]

It's on page 8. Here's a pic of it, and here is a link to the full bomarc se/30 schematics.

http://absurdengineering.org/library/MASTER%20Schematics/Schematics%20-%20BOMARC/Macintosh%20SE30%20Schematic%20(BOMARC)/BOMARC%20SE30%20Schematics.pdf

 

[franklyn]

Thanks

 

[franklyn]

The schematic isn't quite accurate, because on my floppy drive, it isn't transistor Q7 that controls the eject motor, but rather Q9...

 

[Callan]

Did it fix it?

 

[franklyn]

The Q9 transistor is ok. I must test more, I will see the Eject signal comes from Pin9 of the Floppy connector ...

 

[franklyn]

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?