Arcade Collecting > Pinball
Black Knight pin blowing fuses
lilshawn:
your "green" relay is the main power for the solenoids. if the contacts are corroded, there will be a great increase of resistance... the load on the fuse will be huge... enough to blow it.
flippers have it's own separate system... your not having issues with the flippers so there is nothing there to worry about.
GI has it's own fuse on a block (just below)...unless it's blowing there is no problems there either.
check VR1 next to f2 (should read very low ohms) if it's toast it will read a short (designed that way).....The varistor is a one-time surge suppressor. When a power surge or voltage spike is sensed, the varistor's resistance rapidly decreases, creating an instant short path for the over-voltage. Because the varistor creates a short circuit, the varistor and the line fuse are damaged in the process.
also you might as well check c13 too as well since it's the filter cap for the coils
so unless you have a fried coil someplace (something that reads less than 2.5 ohms is suspect)
assuming the above are all fine...the only thing left is the relay
SirPeale:
I must have misread - I thought there were two relays, one for lights and one for flippers. I admit I only breezed thru what I was reading and haven't returned back to it.
SirPeale:
Where can I find the driver transistors for the driver board? Mouser doesn't carry them, nor GPE. 8977 or 8052 or 8039, which?
lilshawn:
Give www.nteinc.com a try, they have a cross reference there on the site. It's a common parts replacement that is stocked at most local shops...you may be able to find a sustitute locally.
I would do it for you, but their site doesn't work very well with my mobile phone
SirPeale:
I was trying to stick with OEM. NTE stuff is usually pretty highly priced. But I did find it - NTE261. Even states "Williams" right in their database.
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