Re: I want to calibrate 5.25 inch floppy drives myself

[robbie@mindspring.com (Robbie Honerkamp)]

In article <ericg-2509951337300001@ericg.cpd.tandem.com>,
ericg@cpd.tandem.com wrote:


> My wife teaches in a school that still uses Apple IIes and IIcs, and she has 
> a lot of bad 5.25 inch floppy drives.  I'd like to clean and calibrate
> them before sending them off to be repaired.  I'd like to try calibrating
> them
> myself.
> 
> I am an electrical engineer, so I have access to oscilloscopes and such,
> but I do not have the calibration disk nor the procedure.  How can I get
> these items?


Copy II Plus has a disk speed disgnostic program. Also, Memorex (I think)
used to put out a diagnostic disk that let you align and check the
rotation speed on a 5.25" drive. It's been a looong time since I've
worked on them, but if I remember correctly, the biggest problem with the 
drives was the speed being off.. It's fairly easy to set the speed, there's
a screw on the drive that you can adjust while running the CII+ program..

Anyone remember which screw it is?

Robbie