Sony 2MB MP-F75W Floppy Schematics ...

franklyn

6502

• Thursday at 7:16 PM

• #1

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

6502

• Thursday at 8:45 PM

• #2

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

6502

• Friday at 5:37 AM

• #3

Callan said:

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

Click to expand...

... thanks but I can not find it.

 

Callan

6502

• Friday at 6:02 AM

• #4

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

 

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franklyn

6502

• Friday at 6:25 AM

• #5

Thanks

 

franklyn

6502

• Friday at 7:02 PM

• #6

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

6502

• Friday at 8:02 PM

• #7

Did it fix it?

 

franklyn

6502

• Saturday at 12:44 PM

• #8

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

 

franklyn

6502

• Today at 7:12 AM

• #9

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?