Mac SE/30 floppy drive disk initialization fails

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Mac SE/30 floppy drive disk initialization fails

I have a Mac SE/30 with Rominator II and SCSI2SD drive. I have a 1.44MB superdrive as the internal floppy drive. I can sometimes read an application or formatted disk, but most times after opening a file or writing a file to the disk the Finder shows an error that the disk "<disk name>" cannot be found and the disk icon disappears from the desktop while the disk is still in the drive. When I try to format a 1.44MB disk I get an Initialization Failed error. I have tried a second 1.44MB disk drive and get the same errors. I have even tried a FloppyEmu as the internal drive and as an external drive and get the same errors. The SCSI2SD drive always boots to System 7.1 fine and reading and writing files to the SCSI2SD drive works fine without errors. Has anyone had a similar issue?I am thinking that my SWIM chip is bad. I have looked at the motherboard and cleaned the motherboard to remove any possible dust/contamination and cannot get good performance from any floppy drive.Has anyone successfully removed/replaced the SWIM chip?

 

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From repair manuals this

From repair manuals this appears to be a common result of a faulty RP10 (Bourns 4120R-601-250/201).

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Thanks - just ordered replacement RP-10

Thanks! I used your information and found some reference information on failed RC network packs. I'm gonna give it a try. I ordered 3 of these parts from Digikey today. 

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Replaced RP-10, but disk initialization still fails

I finally got around to replacing RP-10. Unfortunately, after the replacement the disk initialization and other problems persist. I did find  that with FloppyEmu attached as an external disk drive I could read and write to 400K disk images okay, but 1.44MB disk images might show up on the desktop, but if I tried to launch the application on the 1.44 MB disk image it would sometimes launch and when I quit the application a disk error would occur. I'll have to try an 800k disk image and see if I can read and write 800K images.

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