Hi to everyone.
My name is Miguel, amateur on electronics. I bough this scope on ebay six months ago and works fine until today. My knowledge on electronics is not too big (I used scope to measure PWM and other stuff on arduino boards) but understand the basics.
Today during measurements, vertical deflection start to fail. Image on screen was compressed when scope was warm (unplug and wait until scope is cold made start to work again but about 10 minutes turn on, scope start to fail). If I tap the scope, magically repair itself, I think it's a matter of time that the fault is permanent.
I have tried to reseat all connectors on XYZ amplifier (could be an false contact), but still happens. Everything looks fine, there is no blowed components or leaky capacitors. Have got service manual but I do not know where to start.
Any help would be appreciated.
Thanks.