Doctor Who
Bally, 1992Thought I better start looking into the fact that the more I play my recently aquired DW, the more the inserts stay lit. All the outlanes stay lit now, making you think you get an extra ball instantly (you don't). An increasing number of inserts also seem to be lit as soon as the game is started. OK in attract mode.
Any good place to start checking?
If you get a similar result (or even if you don't and still get it during gameplay), try swapping the lamps for incandescents in those inserts. I suspect it's just ghosting.
Usually a drive transistor if multiple lamps are on, but if all lamps on, would it be all transistors? Seems unlikely, but they could have been progressively blowing due to a bigger problem. Any of the fuses over-amped?
My Tommy has a whole row stuck on very bright at the moment and it is a bad pre-drive transistor.
Quoted from dendoc:Now, in attract mode - all lamps on. On lamp test single lamp - all are on too.
Do you have a logic probe?
If in single lamp test all lamps are on (and I presume you mean all lamps, not all lamps in the same row or column) then it is most likely a logic issue rather than a driver issue. You will need a logic probe to test the circuitry.
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Burleigh Waters
Richmond, VA