Tek 2215, strange behavior on CH1

[DigitalAura]

Hey Guys, new to the forum and I was hoping somebody had an idea what could be wrong with my new scope I just got off of ebay.

Sine wave kinda looks okay apart from what looks like square wave artifacts...  It gets real interesting when I try to view a square wave.

It would be awesome if somebody knew what was going on here and what I would need to do to fix this, it only happens on channel 1, channel 2 is perfectly fine.

Thanks

[David Hess]

You do not give the horizontal and vertical settings but it looks like there is an open in the high impedance circuits before the buffer of channel 1.

[cdev]

This might be the problem, the little red circle shows the switch for coupling is set to "AC" - It should be set on "DC" to view a square wave.

[DigitalAura]

Nothing to do with settings but thanks anyway.  I'll dig out the service manual and check the first solution though for sure.