I have seen this problem before in the vertical direction where a load
resistor in the CRT vertical amplifier was open.
Be sure to check power supply voltages and that the deflection plates
are actually connected. Sometimes the leads loosen and fall off.
Since the trace unrolls when the position control is used indicating
that the sweep signal is not the problem, I would look after that
point on schematic 10. There are lots of DC levels shown on the
schematic which can be checked to narrow down the possibilities.
Some of the voltages are high so be cautious.
On Sat, 19 Jan 2013 18:08:54 -0000, "keithostertag"
<keitho@...> wrote:
Hmm... I recently got this 549. Haven't opened it up yet, so I haven't checked voltages yet.
The trace is compressed on the right third of the screen. If I rotate the horizontal position control to the left I can watch as the trace "uncompressses"- don't know what else to call it. Independent of plugin used.
Ideas of where I will be needing to look?
Also, though this photo doesn't show it, when I use an external signal (sinewave) the trace is wide, like a ribbon, Not sure if that's related.
Thanks,
Keith Ostertag
David Hess