Re: Platinum 5.25" drive problem

[Stephen Shaw <xstephenx@apple2.org.za>]

There was a problem vis-a-vis the GS and the Duodisk which involved unsoldering
two ceramic disc capacitors. Have you checked your drive speed with Copy II
Plus or the Apple Dealer Diagnostics?

On Wed, 27 Jun 2001 22:49:11 +1000, John L wrote:

> On Wed, 27 Jun 2001 20:39:41 +1000, "Mark Cummings"
> <NOTfigjams@primus.com.au> wrote:
>
>>No, the stepper motor does not control the drive speed, it moves the heads
>>in and out. Of course I am assuming the stepper is moving the heads. This is
>>normally something you can hear if you put your ear up to the drive, or open
>>it up and see what it's doing when reading the disk.
>>
>>I would open it to get a few more clues.
>
>
> I already have and it's not immediately obvious what is wrong.  I
> initially suspected the head alignment was off thinking that the
> stepper motor had come loose.  After further investigation, it appears
> that the cause of my disk problems relate to my DuoDisk - it keeps
> trashing my floppy disks rendering them unuseable.  My Platinum 5.25"
> drive appears to work ok after testing it with freshly formatted 5.25"
> DSDD disks and hooked up to my spare //e .
>
>  I have already cleaned the heads of both my Duodisk drives and
> adjusted the speed of both.  At various times both of the drives act
> normally and will read/write data correctly to any disk.  More
> frequently however, the DuoDisk drives will refuse to boot any disks
> or even show a catalog on a formatted disk (using Copy II Plus booted
> off a Unidisk 3.5" drive).
>
> I noticed in the FAQ that two DuoDisk mods are recommended.   The
> first one deals with the "Trashing of disks on CTRL-RESET-OA"  issue
> which sounds similar to the problem I'm gaving with my DuoDisk
> although my second drive is affected as well..  The second mod relates
> to daisy chaining a DuoDisk on a GS - not really relevant here.
>
> Has anyone done the first modification mentioned above and what were
> the results ?
>
> Furthermore, is the second mod necessary ?
>
>
>
> John

-- 
Why make things easy when you can make them complicated!