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Hameg HM400 trace problems

Hi,

Have a problem with screen of Hameg HM400. After initialization,

1- the trace either does not show on the screen, although light is there. OR 
2- It is stuck on the right hand side of the screen. If we move the dial for XY positioning, the tracer line moves towards right so much that its shadow comes back from the right side. 
3- the digital controls for intensity and focus are not working properly. focus works but as soon as I leave the button, it comes back to its previous state. same happens with intensity. as soon as you leave the intensity button after dimming the trace, it reverts back to brightest possible intensity.

Can you please let me know what could have gone wrong??

Thanks

Irfan