In order to help us get back on track I volunteer to post some TEA pron. I'm up to my elbows in Tek 2465 DMS. The fan motor has developed a death screech. So I have to go in and pull it out and see if I can save it with a clean/lube. But that means tearing down the entire scope and pulling the power supply. No easy task with a fully optioned 2465. I will be posting the entire procedure in the 2465B teardown thread but here's some teaser shots. Now let's everyone be good and enjoy the pron. ![Laughing :-DD](https://www.eevblog.com/forum/Smileys/default/smiley_laughing.gif)
This is the underside of the top plate with the Counter/Trigger board in front and Buffer Board behind it.
The DMM board.
Top plate removed and power supply exposed and ready to pull. ![](https://imagizer.imageshack.com/v2/xq90/923/K843xk.jpg)
![](http://dasarodesigns.com/~medasaro/2445fan/labels.jpg)
Mmmm... yummy. I did
this exact job on the Seimens motor in my 2230 about 10 years ago. IIRC, I cheated and did NOT unwind the motor; rather electing to remove the thrust bearing/set screw, then a couple squirts of
CRC 03040 Food Grade silicone spray as cleaner in each end, ran the armature chucked up in a drill for a couple minutes, then a couple more squirts to carry away the stuff that broke loose.
After that, I let the motor sit overnight with a fan to be sure all the alcohol from the silicone spray had evaporated, and then several drops of 0W-30 full synthetic motor oil, work the shaft back & forth and let it wick in, then a several drops again in each end as an attempt to re-saturate the batting around the bushings. Evidently it was successful; ten years later the one thing that doesn't have a problem in my 2230 is the fan.
Did you get the collet-clamp on the squirrelcage free in one piece? My experience is that this is a losing battle... even ones I know I got free a few years ago were discovered broken in-use later.
IIRC, the fan on my 2230 (or maybe it was one of my 2465s) is just held on by friction; I left the broken piece off, then put a nylon washer on the motor shaft. Then I put the the cone portion onto the shaft and pressed the fan in place with moderate force so everything bottomed out against the motor while holding it inside the 'scope. I tried pulling it off and it was on there much tighter than the press-fit most such fans are equipped with; and so far, it has not worked loose YET after many years. Lets just call it an ongoing experiment; whichever scope it's still on.
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
![](https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/?action=dlattach;attach=533949;image)
I keep telling myself I'm going to find
one of these that fits the taper of the fan; but alas, so far I couldn't be arsed to carry through with that plan.
![Face Palm :palm:](https://www.eevblog.com/forum/Smileys/default/facepalm.gif)
mnem
*back out into the suck-a-day*