Rigol DS1054 Weird Channel 1

[AdamHerbst]

Hello Everyone, attached I have a photo of the inputs for my Rigol DS1054. Every channel but channel 1 seems to be working in order. Channel 1 is very wonky. What would be the best course of action for a repair? Opening up the oscilloscope probing the inputs, or could it be a firmware issue? I will be doing both, but im just wondering if someone before me had this problem and could share a little bit of wisdom.
~ Adam

[GGMM]

hello,

See here some small diagram tips
https://www.eevblog.com/files/Rigol-DS1054Z-Schematic-DiffAmp.pdf
https://fr.scribd.com/document/383431220/Rigol-DS1054Z-Schematic-FrontEnd

I think we need to dig there to the input
Basic thing, you did the test to invert the probes and see which are all at *10

Confirm 1054Z.

I don’t know any more

cdt

[wasedadoc]

I doubt that could be a firmware problem.

Is it the same for all settings of CH1 Volt/div?  (Adjust input level appropriately)

[2N3055]

Check the probes first.  Try exchanging probe from a "good" channel first.
Probes that com with the scope are not very robust.

[wasedadoc]

Check the probes first.  Try exchanging probe from a "good" channel first.
Probes that com with the scope are not very robust.

The rising and falling slopes of the displayed CH1 are different.  I don't think a fault in a passive probe could do that.  There is also delay.  Looks to me like a hardware problem in the scope.

[GGMM]

hi,

also look at the ladders
on ch1 the signal seems to make 3v peak to peak
6v for the others

cdt

[2N3055]

Check the probes first.  Try exchanging probe from a "good" channel first.
Probes that com with the scope are not very robust.

The rising and falling slopes of the displayed CH1 are different.  I don't think a fault in a passive probe could do that.  There is also delay.  Looks to me like a hardware problem in the scope.

It can definitely be the probe..

It can be channel but also probe.