(Topic ID: 221690)

Eight Ball Bally - 1A Playfield Fuse blowing - Slingshots & Middle Pop

By crazi

3 years ago


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  • 20 posts
  • 8 Pinsiders participating
  • Latest reply 3 months ago by pins4u
  • Topic is favorited by 1 Pinsider

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#1 3 years ago

Hi All - so i'm reviving a dead 8 ball. Have fixed the MPU so it now goes in to attract mode. Got the displays up and running. No Sound but I will get there.

1A playfield fuse was blown. Put in a new one and ran the solenoid test and it popped the 1A fuse again. So I decided to sacrifice a few fuses. Ran an earth to each Tip on the Driver board to activate each solenoid one at a time. All worked fine except for BOTH slingshots and middle (lower) Pop Bumper blow the 1A fuse. It would fire the coil but then pop the fuse.

So must be a short?

Checked the diode on each of the 3 coils - all ok. Checked the coils out of circuit with the diodes off. Slingshots 7 Ohms and Pop 3.7 Ohms (all 3 seem ok to me)

No wires on the switches are touching anything they shouldn't.

So what next?

Ta in advance

#3 3 years ago

Yes an SB.

#7 3 years ago

Working coils are measuring between 10 and 11 ohm.

Would a 3 Ohm (7 Ohm difference) be enough to pop the fuse?

Like wise the Slings are measuring 7.1 Ohm would a 3 Ohm difference pop the fuse?

#11 3 years ago

Yes tested the diodes disconnected.

The Pop coil doesnt look great. It's a 26-1200

The slings look ok but the original wrappers are gone so not sure what they are. They should be 25-950 (that's what working on my other 8 Ball)

When grounding it was a quick touch but it's the same result during game diagnostics tests as well. Pops the 1A

QUESTION

I have 2x 23-840 coils and 1x 23-800 in stock - can I use them?? Widely used on Williams

#14 3 years ago

Cheers thanks for the coil info

So as 1A is quite low for coils. I tried a 2.5A and reconnected the slings. They are working fine. Is 2.5A fuse ok???

Going to reconnect the pop and see if it blows the fuse. If so I will order a coil.

#18 3 years ago

Have ordered 3 new coils. I agree.

Ive just noticed the out kicker, Saucer and 4 bank target set aren't working. Need to check the diagram but I think they get driven through the solenoid relay a/b type. Not used to Bally so it's like starting over

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