(Topic ID: 224361)

EM Keeps Blowing Fuses - Newbie here

By Murphdom

3 years ago

Topic Heartbeat

Topic Stats

  • 22 posts
  • 9 Pinsiders participating
  • Latest reply 3 years ago by Murphdom
  • No one calls this topic a favorite


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#1 3 years ago

hello everyone,
First off I would like to say that I am brand new to all of this and this is my first machine I am looking to fix. I picked up a 1970 Chicago coin big flipper for cheap money. The guy who sold it to me knew nothing about it. Taking a quick glance while I was buying it I noticed that several fuses were blown so I was hoping that was the fix. I called up Steve at the pinball resource and he had the most impossible fuses to find. I put them in and it turned it on and everything lit up. I thought I was good to go. I then put a quarter in to get a credit and a fuse blew. I replaced the fuse and now as soon as you turn on the machine the same fuse blows. Its a 15 amp fuse. Should a be using a slow blow or fast blow? Is it the plug where it might not be grounded as a two prong? Any thoughts?

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#2 3 years ago

It's a fast blow. You have a short somewhere, probably a coil or relay that's bad.

You should replace the cord with a modern three prong and ground your cabinet. Pinball Life sells ground braid.

#3 3 years ago

How can I tell if a coil or relay is bad?

#4 3 years ago

For starters something may just look wrong, here's an example from my latest EM project

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#5 3 years ago

Pm sent


#6 3 years ago

Good point. Look for a burnt coil. Wrapper is often toasty brown.

#7 3 years ago

I’m assuming the one on the right is toasted.

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#8 3 years ago

I was expecting something more dramatic but potentially...

#9 3 years ago

Maybe. Can you move the plunger inside it? Does it have zero ohms resistance?

#10 3 years ago
Quoted from Murphdom:

I’m assuming the one on the right is toasted.

Don't assume anything, unless you like paying to replace good coils. Check with multimeter. I've had some that looked like hell, but they worked fine.

Check for wire shorts as well.

#11 3 years ago
Quoted from currieddog:

Don't assume anything, unless you like paying to replace good coils. Check with multimeter. I've had some that looked like hell, but they worked fine.
Check for wire shorts as well.

Well said.

#12 3 years ago

Can you turn credit wheel by hand and push start button.see if fuse blows then.if game starts,it's in quarter switches.are they those micro switches.try to isolate problem.

#13 3 years ago

Can you post a picture of the complete underside of the playfield, back of the backbox and looking down into the cabinet?

#14 3 years ago

Hey John,
I see you found my handle/post. Thanks for pointing me in the direction of pinside. Here are the pictures

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#15 3 years ago

Fixed it. Where there were no credits on the machine and one of the reels was stuck on a number which kept a circuit hot. I was finally able to nudge it to zero and it fired right up. All the other reels moved no problem when I zeroed them out. Now the game plays no problem but it doesn’t keep a score. Thoughts?

#16 3 years ago

Do score reels turn at all.if not check score relays.there the three farthest left in pic.clean those switches on all those.then while game is on,manually push in relays and see if reels turn.if score reels turn .we need to look at relay coil circuit.

#17 3 years ago

The machine itself is filthy. Except for the playfield some how. It’s Like the machine came out of a chimney covered in soot. The reels are really dirty. Any suggestions on how to clean them? I’m new to this whole thing. Maybe a good clean will help. The hundred reel on player one moves sometimes but nothing else and player two most of the numbers work.

#18 3 years ago

Ok.take pics before you take apart.always!!.close ups of wires ect..then go online to you tube videos,pinball score reel clean ,rebuild,ect .next go online to empinrepair.com .go thru steps.he also shows pics of parts.let me know if those help.its not that complicated.but do take pics from different angles before you disassemble anything.

#19 3 years ago

Sorry,it's pinrepair.com .go thru his steps cleaning and typically what's wrong steps.hope this helps.

#20 3 years ago

Check Clay's famous guide. It has just about all info you'll need for everything: http://www.pinrepair.com/em/index1

Go carefully, doing one thing at a time. Take pix, take notes.

#21 3 years ago

Do not spray lubricant on them. That's a good way to start a fire. The gasses can get set off by the sparks that are common in an EM pinball machine.

#22 3 years ago

Thanks everyone

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