Michael Roma
Active member
My Williams IJ is starting to act a little flaky. When the ball is in the upper half of the playfield near the pop bumpers I hear Shortround say "You cheat Dr Jones" when he shouldn't be. I saw an older post on RGP where the op had a similar issue and a recommendation was to check the 10 switch Opto board for cold solder joints.well I pulled mine out to find a nice little job done on it (see below).
I do not see any cold solder joints on the header pins but am now thinking that perhaps the "i've seen better days" resistors might be the culprit. the manual has the values for those at 220 2W, 1/2W. i tested the ones currently on the board and they are 270 ohm (the same as the ones on the 7 ball trough pcb). I have a bunch of new 270 ohm resistors that I have left over from when I replaced the ones on the trough pcb. Are these safe to use these on the 10 switch Opto board?
- Mike
I do not see any cold solder joints on the header pins but am now thinking that perhaps the "i've seen better days" resistors might be the culprit. the manual has the values for those at 220 2W, 1/2W. i tested the ones currently on the board and they are 270 ohm (the same as the ones on the 7 ball trough pcb). I have a bunch of new 270 ohm resistors that I have left over from when I replaced the ones on the trough pcb. Are these safe to use these on the 10 switch Opto board?
- Mike
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