Arcade Collecting > Pinball
Black Knight pin blowing fuses
SirPeale:
Have a client with a Black Knight pin that's blowing fuses.
He claims that it's blowing fuse F3, which I'm guessing works certain solenoids (I haven't looked it up yet). The other fuse he says:
--- Quote ---The other fuse that keeps blowing is a fuse that is mounted on to the back of where all of the score displays are mounted. When I ran the diagnostic on the machine I think it is referring to the jet bumper malfunctioning up top.
--- End quote ---
Having not seen the machine in person (and it being a two hour trip, one way) I want to be as prepared as possible. I'm betting at least one bad coil, but the other one has me scratching my head.
ChadTower:
F3 is lamps.
I don't know of any fuse on the backside of the display door. My BK does have the sys6 style power supply but I don't remember a fuse back there on any other Sys7 games I have worked on.
SirPeale:
--- Quote from: ChadTower on January 05, 2010, 01:46:54 pm ---
F3 is lamps.
--- End quote ---
That's what I thought, but he's saying all the lamps are lighting up. Only the flippers and pop bumpers are failing.
--- Quote ---The machine powers up and all of the lights display. However the flippers and bumpers do not respond.
I opened up the top part of the machine with all of the boards. When I set up a new game the flippers worked for a moment then the F3 fuse blew. The other fuse that keeps blowing is a fuse that is mounted on to the back of where all of the score displays are mounted. When I ran the diagnostic on the machine I think it is referring to the jet bumper malfunctioning up top.
--- End quote ---
and this is from a tech that can not get to the machine any more:
--- Quote ---I am fairly certain one of the coils has internally melted and shorted and just needs to be replaced. The other blown fuse in the lighting circuit I don't know the cause. You can measure the coil resistance of the new coils and match it to the old ones.
If they are within a few ohms they are probably fine. They have to be un-soldered from the power circuit first, then measure the resistance. The shorted one (or more) should stick out like a sore thumb.
The other thing to check is the output of the transformer. They have a tendency to go bad after a few years (heat damage) and output higher voltages which in turn will melt the coils (and other parts). Replacements are available, just hard to find. I have replaced two machines with newer solid state power supplies instead of the transformers for the 50vDC outputs (coils) and just left the lighting and logic circuits hooked to the transformer.
--- End quote ---
Okay...rereading this the other fuse that is blowing must be related to these solenoids. No idea why the lighting fuse would be blowing if the lights are working.
ChadTower:
Lamps and GI are separate circuits. Don't trust his ability to know the difference.
Those transformers are just like any other 1980 game. A block of steel you could throw in the ocean and pull back out a year later and it still works. It's the power supply board that develops problems, often starting with those standalone BRs.
Black Knight doesn't have 50v flippers.
This is a tough game to drive 4 hours to fix and support. That boardset is going to be super flakey if that 40 pin hasn't been swapped.
SirPeale:
--- Quote from: ChadTower on January 05, 2010, 02:13:59 pm ---
Lamps and GI are separate circuits. Don't trust his ability to know the difference.
--- End quote ---
Yeah, there is that. :)
--- Quote ---Those transformers are just like any other 1980 game. A block of steel you could throw in the ocean and pull back out a year later and it still works. It's the power supply board that develops problems, often starting with those standalone BRs.
Black Knight doesn't have 50v flippers.
This is a tough game to drive 4 hours to fix and support. That boardset is going to be super flakey if that 40 pin hasn't been swapped.
--- End quote ---
Knowing little about this particular pin, can you expand on that?
I hate distance repairs; they're either something so simple that all my research I did beforehand doesn't apply and it's fixed in short order, or you go around and around and then find out you don't have the right parts on hand, necessitating a return trip. I'm really trying to avoid that. If only these machines all used the same solenoid, I'd just grab one and chance it.
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