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.
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.
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.
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.
mnem
*back out into the suck-a-day*