Newbie level 4
I got one of those vintage oscilloscopes, however if i turn it on (and the CRT is already heated up), i see a line/moving dot for a second or so that then fades away quickly. The time base seems to work, as well i can change the position of the line in x- and y-direction. Any hints where i should start seeking the error? Any schematics available for this device? The inside parts are overlook-able and there are verbose prints on the boards.