fuse blowing issue

kuglerarcade

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hi im helping my friend work on his williams black knight pin.got it working but now every once and a while the 2.5 amp solinoid f2 fuse blows.i looked at the coils for a burnt one or a possible a wire shorting out,but didnt see any.anyone have any ideas.i was thinking maybe the bride rectifire, but if so why would it blow every so often.im going to see him this weekend and will test the rectifire ?
 
hi im helping my friend work on his williams black knight pin.got it working but now every once and a while the 2.5 amp solinoid f2 fuse blows.i looked at the coils for a burnt one or a possible a wire shorting out,but didnt see any.anyone have any ideas.i was thinking maybe the bride rectifire, but if so why would it blow every so often.im going to see him this weekend and will test the rectifire ?

You need to actually Ohm out the solenoid. Anything under 4 ohms I'd replace it. You just might be at that IFFY stage.

Also - you need to check the diode as well.
 
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hi im helping my friend work on his williams black knight pin.got it working but now every once and a while the 2.5 amp solinoid f2 fuse blows.i looked at the coils for a burnt one or a possible a wire shorting out,but didnt see any.anyone have any ideas.i was thinking maybe the bride rectifire, but if so why would it blow every so often.im going to see him this weekend and will test the rectifire ?

This is not an uncommon problem with Williams games. Connectors can contribute.
 
Connectors can contribute.
I have a Time Warp that was doing the same thing. It would be fine then sometimes out of nowhere the fuse would blow. Pulled the backglass so I could look at the boards while I played the game to see if a specifice coil was setting it off. While I was playing the game I saw a spark at the connector and the fuse blew. Reseated the harness to make sure it was on there right and the issue cleared up.
 
Also, on some Williams games....if a "special solenoid" switch sticks closed, it'll cause to coil to stay energized...thus causing the fuse to blow. I know Williams fixed this problem by making the solenoids "one shots", but I'm not for sure of the timeline...and on which games the switch happened. Special solenoids are usually the slingshots and pop bumpers. I find this situation more problematic with pop bumpers. The pop bumper "spoon" will develope a tiny hole in it at the point where the platter touches it. The platter point will stick in the hole....causing the switch to stay closed....causing the coil to stay energized....etc.

Edward
 
I had the same issue with my Williams Comet!!! It wound up being the coin lockout coils in the coin door....Check those......
 
Also, on some Williams games....if a "special solenoid" switch sticks closed, it'll cause to coil to stay energized...thus causing the fuse to blow. I know Williams fixed this problem by making the solenoids "one shots", but I'm not for sure of the timeline...and on which games the switch happened. Special solenoids are usually the slingshots and pop bumpers. I find this situation more problematic with pop bumpers. The pop bumper "spoon" will develope a tiny hole in it at the point where the platter touches it. The platter point will stick in the hole....causing the switch to stay closed....causing the coil to stay energized....etc.

Edward

They solved that problem starting with System 11B.
 
I have a Time Warp that was doing the same thing. It would be fine then sometimes out of nowhere the fuse would blow. Pulled the backglass so I could look at the boards while I played the game to see if a specifice coil was setting it off. While I was playing the game I saw a spark at the connector and the fuse blew. Reseated the harness to make sure it was on there right and the issue cleared up.

4110556201_586669b3dc_z.jpg


On my BOP I had a fuse that would blow randomly. Actually my first posts here were to trouble shoot GI issues and the cause came down to wires being hard soldered to the board.

I had a guy come in and install new header pins and connectors. Some of the wires needed a jumper wire from one pin to another pin. While he was fixing it, he explained that the jumper wire would fix my every now and then blowing fuse by spreading the power over the two wires instead of the one before.

Not sure if that makes sense. There are pics on pinrepair.com that I wanted to use but just noticed pinrepair is blocked here at work. They have blocked anything with the word game in it to keep people from goofing off. But our terminal servers are running much lower now that people cannot play farmville ;)

Anyways, what I am trying to get at is that my problem was at the connector. I have not blown a fuse since.

EDIT:

Grapped a capture over lunch

5036930664_21c172fc4e_b.jpg


from here http://marvin3m.com/connect/index.htm#looped
 
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