Jim,

Thanx for the tips. I've did some additional checking.
Yes there is high voltage present and also CRT filament resistance.
The're ok.

It pointed the problem to be in the CRT drive XYZ.
I just removed the PCB's and checked all diodes and transisitors.

Guess what: 1 diode was broken (BUV21) and one transistor dead (bc548)
After replacing these parts, i had to adjust the blanking level and BINGO!
It works again!

Ok: i bought this scope from my firm since it was too expensive to repair.
Repair costs estimated: Euro 875 incl. calibration certificate.
I payd..... Euro 10,- and i repaired it for: Euro 0.35
(ok, i had these parts on stock)


Regards,

HAPPY HANS