(Topic ID: 258469)

1984 Eight Ball Deluxe Blowing 3/4 Amp Fuse

By PinballGurus

4 years ago


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  • 24 posts
  • 4 Pinsiders participating
  • Latest reply 4 years ago by Quench
  • Topic is favorited by 1 Pinsider

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#1 4 years ago

Machine is blowing 3/4 amp fuse and LCD display not turning on. Curious if anyone else has had this issue? Or any ideas what the issue could be?

#4 4 years ago

Thanks. I will do that and report back soon.

#5 4 years ago

I pulled J3 and J4 and the fuse didn’t blow so I pulled the solenoid driver board. Anything specific I should look for?

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#7 4 years ago

Yes. The one on the main fuse panel. I tested all the transistors and they are good. I’ll test your recommendations next. I have a feeling it’s the large capacitor too.

Quoted from Quench:

You'll need to test the three transistors (Q21, Q22 and Q23) and the diodes (CR21 and VR1) on the high voltage section on the solenoid driver board for short circuits although I don't see any burnt resistors in the area which is usually accompanied by shorted transistors.
Note the only time I've seen your particular problem, it was caused by a fault with the big capacitor (C26 located at the top left of your board) causing the 3/4 amp fuse on the rectifier board to blow on powerup.
BTW just to clarify, when you say 3/4 amp fuse, you are talking about the one on the lower cabinet rectifier board right?

#9 4 years ago

I’ve got another solenoid driver board for this game. I’m tempted to put it in and see if it fixes the issue, but I’m worried I could blow it too; not mine. Thoughts?

#10 4 years ago

A few of the small brown capacitors are testing low; not sure if that would blow a fuse though. Doubtful.

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#12 4 years ago

Sounds like a great idea. I’ll report back tomorrow. Thanks!!

#13 4 years ago

I detached one side the large capacitor and it’s still blowing the 3/4 amp fuses. Other ideas?

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#17 4 years ago
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1 week later
#20 4 years ago

So I unplugged all the displays and still blow the fuse.

I swapped out the Solenoid driver board with a known good board and same result. I also put tested the Eight Ball Deluxe board in another machine and it works fine.

Perhaps I should look under the power supply for shorts?

#22 4 years ago

Thanks man. I was going to check that rectifier board next, but checked CR2 and it was indeed bad. Swapped it out and were working now.

Quoted from Quench:

There are four 1N4004 diodes on the rectifier board (marked CR1, CR2, CR3, and CR4) in the lower cabinet.
With the machine off, test those four diodes for a short circuit with your multi-meter. If one is shorted it will blow that 3/4A fuse on the rectifier board.
However you mentioned in post #5 above when you disconnected J3 and J4 from the rectifier board that the fuse no longer blew which indicates the problem is after the rectifier board.
Has somebody changed the J3 wire connector at the solenoid driver board and wired it wrong?
The display high voltage leaves the rectifier board at connector J4 pin 6 and enters the solenoid driver board at connector J3 pin 6. It's a grey-blue wire.
There's also two ground wires for the high voltage circuit on the solenoid driver board. They are:
Rectifier board J3 pin 6 to the solenoid driver board at J3 pin 22 (black-blue wire)
Rectifier board J3 pin 7 to the solenoid driver board at J3 pin 3 (white wire)

#23 4 years ago
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