Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!julius.cs.uiuc.edu!psuvax1!psuvm!art100
From: ART100@psuvm.psu.edu (Andy Tefft)
Newsgroups: comp.sys.apple2
Subject: Re: Apple 2+ Disk Drive problem - won't stop
Message-ID: <90284.112303ART100@psuvm.psu.edu>
Date: 11 Oct 90 15:23:03 GMT
References: <9010111056.AA06278@apple.com>
Organization: Penn State University
Lines: 16

I have had this problem on two different drives and each time
it was the same problem. Open up the drive and look at the
board on the top. You'll see probably only one socketed chip,
(I don't remember which of my drives had more than one) but you
probably need to replace the 74125. Touch something metal to
discharge any static electricity and carefully pull that ic out.
Its orientation should be clearly labeled on the circuit board.
Carefully remove this IC (you can pry it out with a small screwdriver
but make sure you do it from both ends evenly) and take it (the IC)
to your local radio shack or any store which carries IC's. You
should be able to get one for under $1 (if they come in packages
of 2, don't worry, you might need the other at a later date).

I don't know exactly why these things fail (probably static
electricity) but it's an easy replacement. And if that replacement
doesn't help, at least you've only spent a couple bucks.