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Old 01-02-2019, 10:56 PM
gchase59 gchase59 is offline
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Default Stern "Pinball" pinball game MPU keeps resetting

Stern pinball game just stopped working. I check the 43VDC test point TP5 and found no voltage. Fuse was blown and when I replace it it blew immediately. Rectifier board was pretty beat so I purchase a new one. Plugged it in a blew the fuse for 43VDC. Found the coil for the clacker was shorted so I unplugged it and the game started right up. Started play the game and after a couple games it reset in the middle of a game. I opened the back and could see the MPU board go through selftest and start back up. This continued to happen intermittently. I started monitoring voltages with a DMM and noticed I got an AC reading on the 43 VDC. I got an oscilloscope and looked and I see a lot of ripple on some of the DC voltages. Looks like what you would see after a bridge rectifier but before it had been regulated. Is that normal? Wondering if it is filtered and regulated by the solenoid board?

Thanks for the help
Gary
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