(Topic ID: 92255)

NBAFB multiple driver board issues WPC 95

By mrobertso2

9 years ago



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#1 9 years ago

So I have been brain storming the NBAFB and have had several issues with the flashers. Replaced the corresponding diodes (WPC95). The 104 LED is still out but there is power (21.4v) at the test point. Maybe the led blew? Other issue is the low power sol don't work now, (slings, pops, outhole, through) They previouly did. Test point at the sol 50v is 74.1v. The capacitor tests at 74.1 as well. (100uf x100v) . This is much higher than its suppose to be. The Flippers work fine. Fuses are good and test. Diodes are at 34.1v. Any ideas were to start? Usually low voltage is the issue and I would replace the cap and diodes, but high voltage?

#2 9 years ago

Let's see if I understand this.
LED104 is not lit. That's flashlamp power, and should be off with the coin door open, on with the coin door closed.
With the coin door closed, you have power at the coils. This is measured with a DMM set to DC voltage...one lead on the coil lug, one lead on game ground.
74.1V is nominal for WPC spec'd 50V power. Don't worry about that.

Remove the flash lamp power fuse, and "buzz" it with your DMM...F107.
Make sure that the fuse clips are gripping the fuse tightly.
Check to make sure that you've reconnected all of the connectors on the board.
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