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Check wall outlet voltage for 120v. Reseat transformer connectors in bottom of cabinet and 2 secondary connectors on the right side of driver board. Check voltage at game ROM pin 32 on the CPU board. Lower right pin on the end of the chip. If you're resetting you're probably in the ~4.7v range. Extremely low. If this is above 4.9v though check your flipper coil diodes and make sure they are not open.
If 5v is low get another reading at the 5v test point on the driver board. Still low?
Quoted from kvan99:It's not a myth if the game has a 20 years old capacitor that's been operating 10 years past it's service life, but you're correct check the voltage before replacing, but thinking at least 70% of the reset problems are not the BR and Cap is wrong too.
Yes it's not ok to ignore other variables such as connectors and solder joints, but old components has to be the main cause of resets. For example, I had a board with good connectors/joints that was putting out only 4.75v (and the game was running without resets if you can believe that). I replaced "the big four": BR2, C5, 5v regulator, and C4 for good measure. BAM, result is a solid 5.01v. Board work cannot be ignored!
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Mattawan, MI