I have one switch that is clearly open visually and tests open until the game has been played for a while and warms up. After about 20 minutes of playing, the switch starts scoring over and over intermittently. When this happens, I can immediately test it and it shows "half closed" if that makes sense. The 6803 control board test mode 94 (switches) will indicate two switches if one is closed. When this one is acting up it flashes 0, 13, 0, 13 etc. until you hold the rollover down and actually close the switch, then it flashes 13, 13, 13, 13. What the heck does that mean?

I assume I should start with a check of the pin on the control board associated with the right rollover target, but has anyone experienced something like this?

Thanks. There are many disk capacitors on the 6803 control board, so the switch probably has one. Now I just need to trace it... I have the wiring diagram, but the 30+ year old wires are getting a bit dingy. I have a DMM, so I am sure I can figure it out.

Is this a sign that I can expect frequent failures? There are 106 capacitors on my 34-year old 6803 control board.

Got it. That makes me feel better than something wrong on the control board.

I cut out the cap and the switch still works, kinda. It shows up in test mode, but only scores rollovers about 1/3 of the time. Like you said, frunch, it doesn't score quick hits well.

Thanks for the part lookup. I see in the manual that the OEM cap is .05 uF 12/16V and the one you linked is .047 uF 100V. I want to confirm my understanding of capacitors that you want to get pretty close to the capacitance level and it is ok to use something rated at much higher voltage but not 1 volt lower than what your circuit is running, correct?

Now, here is the real newbie question. This switch is in a very inconvenient place to get to when my playfield is tilted up. It seems like the wiring harnesses in this game are pretty tight so I would unhook them before lifting the playfield past vertical to rest on the backbox, but is that the way to do it or just pull the playfield all the way out? I have a bit more soldering to do on the playfield, so I would like to not be standing on my head for all of it.