Could you repost the repair manual please?
I've just dug a scopex 14d-10 out.
Checked the BF858 I thought was faulty but it tested as to diodes ok.
Turned it on; nothing on the screen but s smudge bottom right when you press locate.
Therefore dot off the screen.
Retested the two heatsunk BF858s, one now had 1.8v as a VBE, all other 4 BF858s where 0.7.
Changed transistor, I now have a waveform.
But it's on the right and sweep doesn't work.
So I spent an hour on the web and ended up here.
Then I followed the circuit again. No schematic.
Sweep pot ok, goes into a quad switch ic ok.
Then goes via an MPS6518 to a BF858.
The timebase signal goes to the other BF858 next to it.
Looks like one horizontal plate is sweep, and the other is timebase.
The MPS6518 is short.
I'll order one.
Would still like a manual to calibrate unit.
Is yours working yet?
All my high voltage readings on these BF858 devices where 180V
Centre screen typically 90V but essentially whenever the two plates are equal.
Also unit has +/-15V to the inputs of that helps.