i have a 3423 (4 channel auto scope that i bought back in 2008 approx)
today i accidentally put spark voltage dirrect to channel 4..
a defective spark plug boot zapped my secondary pickup.. (yes i had it earthed)
at first no channels would work.. but after removing and having a lool inside the unit and putting it back together it works on channels A B C but D is no good..
i can see this being a relatively common problem.. as damaged and defective spark plug leads is not uncommon..
has anyone else had this happen and what was the cost to fix?