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(Topic ID: 328175)

Black Knight/System 7 board blowing fuse/transistor

By nwpinball

1 year ago



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#7 1 year ago
 
TPR

frunch

Pinside member

US Point Pleasant, NJ

11y 135K 3,642 10

Quoted from Black_Knight:

Tried reading it on my phone and going cross eyed.
I think 35 drives circuit 11 which is the special relay on the power board. This is the GI relay that cuts it on and off during game play.

This relay is likely on the power supply board, but if it's not there, it might be mounted separately in the backbox if it's using a system 6 power supply board (as is the case in my BK)...

Also agreed with DumbAss it's probably worth changing the 2N4401 predriver in addition to the TIP 122/102

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