Electronics > Repair

Unknown Issue with Hitachi V-1050F Oscilloscope

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ARAR-S2319 Rose:
Hallo, I recently bought a Hitachi V-1050F Oscilloscope from an eBay seller in seemingly great condition. Everything on the scope seems to work fine apart from the trace itself being... wonky?

In the image above is meant to be a perfect circle on the display though it quite clearly is not, I've adjusted, tinkered, troubleshooted and researched for weeks but I just cannot figure out what the issue even is, nevermind how to fix it. The scope was connected to the line out port on my PC, which was playing two separate mono sine waves at 120hz on the left and right channel. Other media played into it, such as songs by Jerobeam Fenderson are also displayed very incorrectly. I don't know if the connection itself could be an issue or not but I am not at all an expert, just an enthusiast. I have tried recalibrating the scope and I've checked inside for any obvious damage but can see nothing out of the ordinary. I would massively appreciate any help, thanks! (I have never used a forum so if I have done anything wrong I apologise)

jdragoset:
Get the manual.
Check vertical gain calibration of channel 1 and 2.
There is also an x gain (sweep width) to check.

Harry_22:
Have a look 1kHz signal.

tunk:
No expert, but I think I would first use a multimeter
to check the voltages of the two channels.

Mahagam:
Try swapping the inputs

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