21 Oct
2017
21 Oct
'17
11:31 a.m.
Anybody familiar with the internals of these disks? I have one here
which seems to have the positioner stuck at track zero. I'm not sure
whether it's likely to be just a bit sticky and in need of some
assistance or whether there is some sort of latch involved, and I am a
bit reluctant to just pull the lid off the chamber to find out.
Thanks
Phil
23 Oct
23 Oct
8:19 a.m.
I assume you've released the head lock?
On 10/21/17 1:31 PM, Phil Blundell via cctalk wrote:
Anybody familiar with the internals of these disks? I
have one here
which seems to have the positioner stuck at track zero. I'm not sure
whether it's likely to be just a bit sticky and in need of some
assistance or whether there is some sort of latch involved, and I am a
bit reluctant to just pull the lid off the chamber to find out.
Thanks
Phil
8:24 a.m.
No, that was what I was thinking of with the "some sort of latch"
comment. Where is the head lock?
Thanks
Phil
On Mon, 2017-10-23 at 10:19 -0500, Tom Uban wrote:
I assume you've released the head lock?
On 10/21/17 1:31 PM, Phil Blundell via cctalk wrote:
Anybody familiar with the internals of these
disks? I have one
here
which seems to have the positioner stuck at track zero. I'm not
sure
whether it's likely to be just a bit sticky and in need of some
assistance or whether there is some sort of latch involved, and I
am a
bit reluctant to just pull the lid off the chamber to find out.
Thanks
Phil
8:27 a.m.
It varies from drive to drive, but there is usually a sticker pointing it out,
perhaps on the bottom of the drive, sometimes a screw has to be loosened
in order to slide a bracket, etc.
On 10/23/17 10:24 AM, Phil Blundell via cctalk wrote:
No, that was what I was thinking of with the
"some sort of latch"
comment. Where is the head lock?
Thanks
Phil
On Mon, 2017-10-23 at 10:19 -0500, Tom Uban wrote:
> I assume you've released the head lock?
>
> On 10/21/17 1:31 PM, Phil Blundell via cctalk wrote:
>> Anybody familiar with the internals of these disks? I have one
>> here
>> which seems to have the positioner stuck at track zero. I'm not
>> sure
>> whether it's likely to be just a bit sticky and in need of some
>> assistance or whether there is some sort of latch involved, and I
>> am a
>> bit reluctant to just pull the lid off the chamber to find out.
>>
>> Thanks
>>
>> Phil
>>
>>
>
6:14 p.m.
On 10/21/2017 01:31 PM, Phil Blundell via cctalk wrote:
Anybody familiar with the internals of these disks? I
have one here
which seems to have the positioner stuck at track zero. I'm not sure
whether it's likely to be just a bit sticky and in need of some
assistance or whether there is some sort of latch involved, and I am a
bit reluctant to just pull the lid off the chamber to find out.
There appears to be a photo of the internals here, if that helps at all:
http://museum.ipsj.or.jp/computer/device/magnetic_disk/images/0011_03_l.jpg
... it's a little small, so hard to tell what's going on for sure! I don't
see any obvious locking mechanism, though.
There's a Fujitsu M2333KS on ebay - item # 182218376023 - which appears to
be quite similar in layout. That one appears to have some form of
positioner / track 0 sensor accessible from outside the HDA if the logic
board is removed - is that true of the 2235 too?
25 Oct
25 Oct
1:20 p.m.
On Mon, 2017-10-23 at 20:14 -0500, Jules Richardson via cctalk wrote:
There appears to be a photo of the internals here, if
that helps at
all:
http://museum.ipsj.or.jp/computer/device/magnetic_disk/images/0011_03
_l.jpg
... it's a little small, so hard to tell what's going on for sure! I
don't?
see any obvious locking mechanism, though.
There's a Fujitsu M2333KS on ebay - item # 182218376023 - which
appears to?
be quite similar in layout. That one appears to have some form of?
positioner / track 0 sensor accessible from outside the HDA if the
logic?
board is removed - is that true of the 2235 too?
Yes, the stepper motor and track 0 sensor is external and, as you say,
you can get at it with the logic board removed (or, to a lesser extent,
though the side of the chassis with the logic board still in situ).
I took the lid off the chamber in the end and confirmed that there was
no latch and the head assembly itself was free to move. It seemed that
the stepper motor itself was the bit that was stuck. So, emboldened
with the knowledge that I probably wasn't about to snap the positioner
arm off, I gave it a rather more enthusiastic shove from outside and it
now does move a bit. I was able to recover the data from the first 26
cylinders but it won't seek beyond track 25 for some reason, possibly
just more mechanical resistance inside the stepper. There doesn't seem
to be anywhere obvious to add lubrication so I suppose I will just have
to try a bit more force and hope that this frees it up!
Phil
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