I have a Sanwa in a Time Crisis 3 machine that has lost all trace of red color. I am pretty sure it's going to be a failed transistor on the neck board, namely a C3502 . Though I figure I should find replacements for the other 2 that are there with each of the C3502 's. I cannot find any info on them, they are labeled C3334 and A1321 . Any ideas ?
Also what's the best method to test the neck board drive transistors ( Oscope, VOM, Etc ) ?