Kenwood Trio CS-1040 calibration problem

[Party Scratch]

Hey guys, I am trying to calibrate my oscillosope  http://u.rpsx.eu/YxW.jpg . I bought the service manual http://u.rpsx.eu/QRB.pdf and pretty much following the instructions there. But the problem is, that when I calibrate the vertical CRT centering and the vertical axis positioning and I put the cover back, the traces moves up about one division, the invert position goes off even the trace rotates a bit. How can I solve this? Any ideas? Thanks

[leppie]

You should probably not be calibrating it on a carpet 

[Party Scratch]

I am not. I just put it down to show the metal casing, as it wouldnt fit on my table. But how can that make a difference?

[mij59]

Could be a magnetic field.

I have got a cs2110.
The metal casing is made aluminum, but the handle bar is magnetic.

So maybe your handle bar is magnetized.

[Party Scratch]

Can confirm, the whole metal casing + handle is made of steel and indeed slightly magnetized. So there is the problem... Thanks. Is there a way to demagnetize it?

[Party Scratch]

Hey, I manage to demagnetize it by putting it on top of big ass transformer and slowly moving it up away from it, then I banged it couple times with a wrench and now its demagnetized and it the trace doesn't move even a bit when I put the cover on. Thanks mij59  I never thought it could be magnetic field issue I thought there was maybe a shielding problem  . Thanks again, now lets get to master my proper tongue angle hehe . Thanks again guys.

[mij59]

Hey, I manage to demagnetize it by putting it on top of big ass transformer and slowly moving it up away from it, then I banged it couple times with a wrench and now its demagnetized and it the trace doesn't move even a bit when I put the cover on. Thanks mij59  I never thought it could be magnetic field issue I thought there was maybe a shielding problem  . Thanks again, now lets get to master my proper tongue angle hehe . Thanks again guys.

Very nice, great technique !

Not only the proper tongue angle, also use the proper breathing technique, breath in , breath out.