I posted earlier and I wanted to follow up and see what I am missing. My problem is on the steps ramp where I have more than one lamp lighting. Specifically when you do a lamp test, the frenzy lamp on bottom of ramp will cause the 500,000 lamp on top to light and vice versa. The bottom lamp is row 4 and the top lamp is row 6 on the lamp matrix. In the entire game whenever I test a row 4 lamp its corresponding row 6 lamp lights as well. Ceratinly sounded like a bad diode problem. The majority of the lamps are on pcb boards. To isolate the issue, I unplugged the 4 wire molex connector that feeds the 3 lamps on the steps ramp and the problem resolved.
I removed the ramp to be able to analyze. When i hook up a battery and test the pins on the molex connector, the problem is reproduced. the red yellow wire ( row 4) will light the row 6 ( red blue) bulb and vice versa. The socksts for these bulbs are a bit unusual and discontinued as they have the diode coming directly out of the 555 socket base rather than having normal lugs and a diode soldered in.
I have done a diode test and they test fine with current only flowing one way best i can tell. I have checked for bad solder joints etc and cant seem to find why this is happennig short of something inside the actual socket being shorted.
This machine is new to me and I am hoping other people more familiar with the machine might have some insights. Certainly with this ramp disconnected, all other row4 row6 issues disappear so this has to be the source of the issue.
Any help is greatly appreciated.