That means, no trace without beam finder unless external trigger.¡
No it doesn¡¯t because auto-trigger is on¡
Did you try channel 2? same result?
Did you play with vertical positions? Both normal pos. and with beam finder (BF) on? Vert. pos. should influence with BF activated as well.
Of course, big offset error in (common) vertical amplifier is quite possible but try and narrow things down first.
Raymond
Raymond Domp Frank