Tek 485 erratic baseline sweep all time base

Kevin Oconnor

Been a long time since I worked on this scope & don’t use it too often. Baseline auto sweep is erratic, choppy, and not full width. All settings of time base and uninfluenced by trigger mode or channel settings. Sometimes it settles out and works fine.
I’m looking for possible points to investigate. I have full service manual.
Kevin KO3Y

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