Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!ll-xn!mit-eddie!uw-beaver!tektronix!reed!kamath From: kamath@reed.UUCP (Sean Kamath) Newsgroups: comp.sys.apple Subject: Re: Fix for disk drives Message-ID: <9799@reed.UUCP> Date: 13 Jul 88 05:26:19 GMT References: <157@thelink.UUCP> <10863@andante.UUCP> Reply-To: kamath@reed.UUCP (Sean Kamath) Organization: Reed College, Portland OR Lines: 21 In article <10863@andante.UUCP> jac@forte.UUCP (Jonathan Chandross) writes: >R. Allen "Urt" Wilkinson (urt@cmr.icst.nbs.gov) Writes: >This is a very common problem with an uncommonly simple solution. The 74125 >on the logic board in the drive has burned out. This causes the drive to >write garbage all over your disk, whether or not it is write protected (look >at the schematic -- it's after the write enable/disable circuitry). All you >have to do is buy a new 74125 (less than a dollar) and install it. > >Jonathan A. Chandross I do know that Apple has an authorized fix for DuoDisks. Seems they need to either change/replace/remove a capacitor on the analog card on those babies. I'd check and make sure you have a "good" one. I might be able to get serial numbers, but it should be easy enough through your local dealer. I'm not sure but I recall the stated symptoms match. Sean Kamath -- UUCP: {decvax allegra ucbcad ucbvax hplabs ihnp4}!tektronix!reed!kamath CSNET: reed!kamath@Tektronix.CSNET || BITNET: reed!kamath@PSUVAX1.BITNET ARPA: reed!kamath@PSUVAX1.CS.PSU.EDU US Snail: 3934 SE Boise, Portland, OR 97202-3126 (I hate 4 line .sigs!)