Black Knight
Williams, 1980You're currently viewing posts by Pinsider solarvalue.
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Dear gurus, sleuths, diagnosticians, pinball detectives, doctors and medics,
I have a Black Knight which was fine and now is not (same old story). The game boots up and goes into attract mode, I can add credits but not start a game. I have no solenoids working in the coil test.
I checked fuse F2 (removed it and used a multimeter) it is most definitely good. Where to now?
Any help greatly appreciated, SV.
Quoted from zacaj:Do you have voltage at the coils?
Thanks Zacaj, I only have a tiny bit of voltage at the coils, 0.6V.
Quoted from Inkochnito:Maybe a good time to add the Bridge Board to make it safe.
No more burning hazard with a Bridge Board....
Thanks, looks great but I already have the fuses installed.
Quoted from Schwaggs:Measure the voltage from F2 to ground.
OK, same 0.6V at F2 and at the positive terminal of the solenoids rectifier.
It turns out that the 8A SB fuse has blown (I have the extra fuses installed before the rectifiers). Should I go ahead and replace this fuse or does that mean I need to do something else as well?
Quoted from zacaj:Test the rectifier, it could have failed internally.
Do I have to remove the spade connectors to test it? It looks like they have been soldered on.
Quoted from Inkochnito:No, you can pull the (blue) connector.
Just to seperate the bridge rectifier from the transformer.
Thanks, did that, and the rectifier checks out OK, so I just replaced the fuse.
I have other problems, but I have a separate thread for that:
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Newcastle, OK