On Sat, Apr 3, 2021 at 2:41 PM durechenew via groups.io <durechenew=
[email protected]> wrote:
For those with a 2465A (or maybe B) version; I just received a 2465. Very
clean and good looking inside; probably heavy usage, though, considering
the status of the blower: noisy.
Another thing I noticed (didn't mention that actually works normal - up to
a point) is that adjusting intensity it goes in a de-focus state; partially
adjustable, but you don't want to do that every time you go from low
frequency to higher. Could be a CRT issue or something in the control
circuits; have to do some verification.
The first issue is the one I need some help with: the blower's motor is a
Siemens device that's beyond repair and I'm considering the idea of
changing the whole blower with a regular fan and some mods in the path of
airflow; that if there is a kind soul that could take the trouble to
provide a picture of the fan in a 2465A; from SM I take it might be not a
blower, but a regular fan; I might be also wrong.
I went through the conversion with my 2465, replacing the wonderful
impeller fan with a 60mm case fan. I hated it so much that I bought a new
Siemens motor when one came up on eBay and I reverted the modification.
Note that the back cover on the 2465 doesn't leave as much room as does the
cover for e.g. the 2467 or 2465A, so fitting a slim 60mm case fan was about
the best I could do. Even with a temperature controlled speed reduction,
this was all kinds of whiney and objectionable.
Rather than going this way, you might try to re-lube the motor. On my 485,
which had a horribly noisy & rattling fan, I did this successfully.
I first de-soldered the motor and then removed the thrust bearing at the
back of it. This allowed me access at both ends (bushings) of the motor. I
then flushed the motor with isopropyl alcohol a couple of times
to get decades of ick and crusted up oil out. I then lubed the bearings
with a drop of 30W synthetic motor oil. This seems to have restored it to
wonderful, near-silent operation.
