Author Topic: williams Pharaoh reset problems  (Read 1480 times)

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Marty Machine

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Re: williams Pharaoh reset problems
« on: June 21, 2014, 02:23:25 AM »
I put a meter on the +5 at the power supp and with each time the flippers were pressed (at around 1 second between each press) the voltage would drop .03 of a volt (5v, 4.97, 4.94, 4.91 and so on) until the machine would reset.
Hmmmm, the accumulative decrease in volts looks like the main filter cap(s?) is dodgy and not recovering/charging quick enough to feed the regulation circuitry....
I haven't had the pleasure? of working on a dog board, so i'm not familiar with whats going on around their regulation design.....

just my 2cents ;-)
MM