17 Jan
2014
17 Jan
'14
12:47 a.m.
On 01/16/2014 04:14 PM, Torfinn Ingolfsen wrote:
Hello,
On Thu, Jan 16, 2014 at 4:08 AM, David Gesswein <djg at pdp8online.com> wrote:
I've done it many many times. The bumper is not on the side of the magnet
stack you point to. Its around the corner on the other side and down deep.
I used to do the paper thing but decided it was inviting trouble, hasn't
happend
yet, but that drive is now over 20 years old. Now I reach in with a
forcep and pull
the thing out. It clunks loud when powered down but none have failed
I pulled out my DEC RD53 for testing the archiver
and surprise the heads
were stuck. I opened it and freed them but wasn't able to find the bumper
that is the cause of the problem. I put pictures here.
http://www.pdp8online.com/rd53/rd53.shtml
Does anyone on the list know where the bumper is and can say in relation
to my pictures? The first drive hasn't restuck so far but I have another to do.
Note: I have only done this once.
The bumper is actually inside the head assembly (or whatever you call
it, lower left in your picture), it is kind of hard to remove it
without dissassembling the head assembly.
So I took the easy way out: while holding the head away from its
resting position I inserted a paper strip into the correct "slot" in
the head assembly and that worked. Look at the movement of the part
when the head is going to the resting position to figure out which
"slot" is the correct one. I used a paper strip that just fit into the
slot width and depth wise.
YMMV. from that.
One HDA has out lasted two boards so
far!
I wrote this up maybe two decades or more ago on the comp.os.PDP11 or
maybe VMS usenet lists.
Allison