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hameg 203-6 scop the horizntal went left

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oferfolk:
hi everyone
i have the 203-6 for over 30 years and it  worked fine and also look like new with no any rust
i just did not use it for a few years and i tried it and the line went left showing 2 cm and only can move more left and not to center.
it also the same with component and channels.
nothing is burn there. all look nice and clean.
i clean the switches and everything i could think of.
what else can i check ?

Greybeard:
Find the user manual in the web.
Check internal supply voltages and hum.
Check for overheated resistors, rectifires (or other components).
Check for leaking/blown electrolytic caps

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