IO-4510 scope problem

[Ron]

Wade Crowley wrote:
> The y1 and y2 trace position controls will only bring the line
> up to 6 divisions below center. I checked voltages associated with
> the controls and they seem ok,what would cause it in this or some other
> model?

Where did you check the voltages?

I would start at the vertical deflection plates
(points C and D on the Deflection PCB) with no
signal. DC voltages should be equal more or less
at center of position control. If not, I would
work my way backward, measuring at each stage.

Possible causes include out of balance +15V and
-15V lines, unequal component values in the push
pull circuit AND leaky transistor(s), to mention
just a few.

-- Ron

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