Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!munnari.oz.au!csc!ccadfa!csadfa!stephens
From: stephens@csadfa.cs.adfa.oz.au (Philip Stephens)
Newsgroups: comp.sys.apple
Subject: Re: Many Questions.....
Message-ID: <1047@ccadfa.adfa.oz.au>
Date: 2 Feb 90 04:25:11 GMT
References: <15800043@ux1.cso.uiuc.edu> <15800048@ux1.cso.uiuc.edu>
Sender: news@ccadfa.adfa.oz.au
Lines: 21

In article <15800048@ux1.cso.uiuc.edu>, cs225af@ux1.cso.uiuc.edu writes:
> 
> * There is a potentiometer on the board just above the 'inc.' of the
>   'apple computer inc.'   label on the card.  It is marked  R28  on the board.
>   It is labeled as "Helit rim Model 91".  Any guesses about what this thing
>   does?  I accidentally turned it and until I turned it back near where it
>   used to be it wouldn't read or write to disks successfully.  Hopefully it
>   is about where it should be again, as the drive was reading and writing OK
>   until just before the chip blew.  If it isn't, can anyone tell me what it
>   could harm, if anything?

This potentiometer simply controls the number of revolutions per minute the
drive runs at.  It cannot harm anything except for diskettes that you write to
when it is running at the wrong speed!

Someone else can answer the remaining questions!

_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
_-_ Philip J. Stephens             -_- `My Apple II+ may only have 64K, one _-_
_-_ Department of Computer Science -_-  5 1/4 " drive, a stuffed joystick,  _-_
_-_ University College, Canberra   -_-  and run at 1 MHz; but it's mine!!!' _-_