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[pershorepcs]

Hi all I've got a 1997 mpu4 based boulder dash that runs perfect until you collect  a win and then you get LVD TRIP ERROR and error 90 on lower display.. It's a low voltage 24v payout solenoid  using a known working green label psu.. Mpu board is a known worker and i have run out of ideas of where to look for fault so any advice would be very much appreciated 

[slippery]

I would run the machine in test to check the payout ie to single/20 coin test then do a full hopper dump see what happens. It can be one of 2 things a power supply fault where the load on the solenoid cuts the power supply voltage down or the solenoid its self is faulty