Still working on this thing. It seems to have very little control over the intensity of the beam. Manual here:
http://www.hellspark.com/dm/ebench/tools/Analog_Oscilliscope/tektronix_2213_service.pdfWorking on "Auto Intensity and Z Axis <6>".
Probing for signal 18 (pin 11 U825) I get something similar but a lower top voltage around .8v.
Signal 19 (pin 1 U835) no signal, steady .9V.
Signal 20 (pin 7 U835) some kind of signal, but I think is leakage from other part of the circuit. Voltage -1.2v Attached picture.
Signal 21 (R856) Similar signal to the chart, a little higher voltage 32V, the "SWP Z-AXIS Signal" is at 20V.
I suspecting U825 (there are signs that was previously changed as the solder is a different color) by following the schematics I should have some kind of signal on pin 14,3 and 4, definitely on 4 as this feeds one of the opamps on U835. Should I replace U825?