Found it! Magnifier registration R749 had the center lead broken. And was not suppling the 30V to U760.
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--- In TekScopes@..., "david_s5y" <david_s5@...> wrote:
Hi,
On a tek 2230 in non-store mode, the displayed signal becomes compressed when position is moved to the left.
So if I have a 5K square wave displayed at .1 Ms the first 1/2 of the wave will be 60% the width if I move it to the right. It also looks like brighter.
+==+==+==+==+==+==+==+==+==+==+
---___---___--- <moved to right>
+--- Short and brighter.
V
==___---___---
What needs adjusting
