I recently got a Rigol DS1102E that my work was getting rid of. Channel 1 has some sort of issue where the signals are negative when they should be positive. The issue is only with Channel 1; Channel 2 appears to be Ok. I've tried swapping scope leads, so that's definitely not the issue. I see the same issue no matter the signal; they are always very low and negative. I have also tried doing a factory reset and the self-calibration procedure, but no luck there. I have attached a couple photos of Channel 1 versus Channel 2 using the built-in calibration signal generator.
Anyone know what may be going on with it? A bad amplifier or something? I think it may be some sort of hardware issue. Has anyone seen this before or know what may be going on here?