heat it up and wait for few minutes, because vertical amplifier must be warmed up.
Trigger from Timebase A should be switched to "AUTO"
Horz-Display should be schwitched to "A"
And 1A1 Plugin, schwitched to "chop"
Both (vert) Postition-Knobs on 1A1 Plug-in should stand be middle.
and turn itensity pots carefully, if you see only light-fog. Look that, postition-lamps and turn Horz or Vert-Postition-knobs.
If you doesn't seeing a trace. That pleas check their power supply on accuaray.
It is normal, this unit has someone little fault after long sleep.
YES, very carefully with intensity pot, CRT Brightness is very strong. If CRT is good, it is possible showing visible trace on fastest sweep with low repetion rate. I tell from repetion rate of 10-50 hz !! This is also why, old tektronix is superior.