North Star SB fuse blowing

(Topic ID: 229056)

North Star SB fuse blowing


By way2wyrd

70 days ago



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  • 7 posts
  • 4 Pinsiders participating
  • Latest reply 70 days ago by pinballdaveh
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#1 70 days ago

So heres my problem.
The one amp slow blow fuse for the sb bank keeps blowing causing the start up sequence to fail.
2c 4c and sb armature and db switch have been cleaned and gapped.
It a simple circuit and im stumped.

Thanks
Jeff
20181109_110114 (resized).jpg

#2 70 days ago

There are a couple of 1A SB fuses. Do both of them blow?
I'm assuming the SB Armature switch is on a trip relay bank somewhere. Could it be shorting to the trip relay bank frame somehow?

/Mark

#3 70 days ago

Just the SB bank blows. Armature shorting is a good guess.

-Jeff

#4 70 days ago

Hmm. I only see a 10 Bank Setup and an 11 Bank Setup on the schematic with 1A SB fuses. Which one is the SB bank? Or is it another one entirely?

If it's either the 10 or 11 Bank, you could pull both 1A fuses and measure the resistance of the coils to see if they're about the same. One may have developed a short.

#5 70 days ago

Its the 10 bank. Coil is a good thing to check as well. I didnt think of that as it works sometimes. Im betting your frame short guess.

-Jeff

#6 70 days ago
Quoted from MarkG:

pull both 1A fuses and measure the resistance of the coils to see if they're about the same. One may have developed a short

Or swap the coils and see if the other fuse starts blowing.

#7 70 days ago

The bank reset arm pivots could be worn making the coil work harder , thus blowing the fuse. On larger banks I have used 2 amp sb fuses with no problems.

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