Hello Dear Colleagues!
I disassembled and cleaned the device, checked the power supplies, and everything is fine with those, the voltages are correct. I reconnected the horizontal and vertical deflection connectors, then set it to calibration mode, where everything seemed good. However, in the 10V and 5V positions, the channels appear noisy. I’ve attached images, including ones with 10x magnification. What could still be the problem?
Regards, Tamas