13 Apr
2016
13 Apr
'16
7:43 a.m.
On Wed, Apr 13, 2016 at 10:12 AM, Rick Bensene <rickb at bensene.com> wrote:
Bill Degnan wrote:
Oooo...yes my misunderstanding of what you meant. What he said.
--
@ BillDeg:
Web: vintagecomputer.net
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I replaced my filters a little while ago, I was concerned about original
filters'
deterioration, perhaps these will have decomposed
over time even if not
in
use. So I found a newly-produced filter,
documented here:
http://vintagecomputer.net/browse_thread_record.cfm?id=588&tid=1
But basically 3M Filtrete #0412560 carbon pre-filter cut to match the
original,
from a tracing.
The filter Bill replaced is the external dust filter. While good to
replace, this isn't the internal HEPA filter that Michael wrote about
replacing on his RK05 drives, and that he found available on eBay.
The HEPA filter is inside the drive. It is a filter designed to capture
very tiny particles yet still be a minimal restriction to airflow. To get
to the HEPA filter, you have to take the bottom cover off of the drive.
The filter is quite large, and as mentioned, there are two different types
depending on the age of the drive. If they haven't been replaced in a
long time, they should be replaced, as they eventually do clog up with
particulates. When this happens, it can restrict the airflow to the disk
platter area, which can lead to dust particles ending up on the platter,
and that can result in head crashes, which are most unpleasant. Sadly,
the manufacturer of the HEPA filter stopped making them a long time ago,
and they can be hard to find. I do believe some manufacturer was making
reproductions of them for a time, but I believe that they are no longer
doing so. So, finding the filters today can be tricky.
-Rick