Re: Problem with Disk ][ drives

[rwmlodoc@.ingr.com (Rich Mlodoch)]

In article <36av6m$867@case.cyberspace.com> arteest@cyberspace.com (Brent A Picasso) writes:
>Instead of smoothly stepping to the next track, the R/W arm simply 
>attempts to move, but instead makes the classic "bzzzz" (oops, I left the 
>drive door open) error sound, and never boots up.. It just keeps trying 
>to move the arm over and over.  you would think it's a problem with the 
>drive, so I went and bought a second, used disk ][ drive.  It does the 
>EXACT SAME THING as the first.  unless both drives are shot, I was thinking 
>that it could be the disk controller card.. what else could it be???
>
Yep, that's what it is. The Drive Card sends out signals to the drive to
tell it where to position the head. I'm sure that I will be corrected
if I'm wrong but remember that if one of the signals controlling the 
stepper motor goes out the drive makes a clicking sound, but doesn't move.
These drive card are cheap now. I'm sure someone can tell you the exact
chip to replace. I can't find my diagram right now.