RHODE&SCHWARZ HM0724 signal reading problem

[Alexiis]

hello, I have a rhode&schawrz hm0724 that can't calibrate or read accurately signals.
when trying to calibrate or measure a signal the readings are flickering or jumping all over the screen.
I have recently bought it for cheap and I am totally new to oscilloscope. And I want to build a small electronics workshop.

I have tried triggering, changing all the settings, and reinitialized it but still having the same issues.
And I'm starting to think the problem is internal.

Can anyone help?

[PKTKS]

well depending on how much new... the task is heavy load

Start by trying a service manual to at least familiarize yourself
with a very complex (and very capable) device ..

Try this reference available here on eevb
 http://www.ko4bb.com/getsimple/index.php?id=manuals

Perhaps something close helps as well
Paul

[Alexiis]

Thank you very much Paul

I'm looking into that