[Radio Wrangler]

Power supplies first

Then try to get the unit going in X-Y mode

Then try to get it triggering in 'norm' 'ext' trigger mode.

Then try to get the timebase going in 'auto' 'ext' trigger mode

Then try to get it 'int' triggering from Y amp signals.

Each of these steps brings in a bit more circuitry. Having the spot(s) far to the right with a timebase fault doesn't automatically implicate the X amp or the power supplies, nor does it exonerate them.

Simple stress factors make the power rails an order of magnitude less reliable than the things they power.

Dsvid