Hi all,
I've just recently got hold of an absolutely huge JAMMA cabinet that has a 28" Hantarex Polo monitor in it, and i've just about got it working ok with an ArcadeVGA video card,
However,
Following the instructions for setting up the monitor in the service manual it says I need to adjust the R/G/B cut off pots to obtain 180V on the collectors of three corresponding transistors (T2,T4 and T6) on the neck board.
I can get the 180V on the Green and Blue transistors, but the Red tops out at 165V ! the image on the monitor is pretty good but this kind of thing bothers me as there is obviously something not quite right.
I've replaced the smaller transistors (BC548B, T3 T5 and T7) which made no difference, which only leaves the main IC (LM1203) or the big power transistors (BF859, which I am unable to find as they are discontinued)
My questions then are -
Any ideas what component could be causing this ?
Anyone know of an equivalent transistor replacement for the power transistors (BF859) ?
Lastly, I've got a Cap Kit on order, which I hope will clean up any other minor wobblies

Neil.