gchase59
Pinball Nudger
- Joined
- Jan 2, 2019
- Messages
- 6
- Reaction score
- 0
- Points
- 2
- Favorite Pinball Machine
- Stern Pinball
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
Thanks for the help
Gary
