(Topic ID: 140997)

Who Dunnit Slot Reel possible slot PCB board issues

By Seatmandan

4 years ago

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  • 14 posts
  • 4 Pinsiders participating
  • Latest reply 3 years ago by atariaction
  • Topic is favorited by 4 Pinsiders


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#2 4 years ago

I had similar issues, I replaced all the LM339's on my boards and they all worked again. Once second all reels worked, then they didn't. How and why all LM339's on all reels blew at the same time, I can't answer. Worked ever since then though.

I hardly ever suggest starting with replacing chips, but if you're good at soldering, it's so cheap and easy.

If not, honestly, there are probably better troubleshooting steps to follow first.

Always use sockets when replacing something like this.

Quoted from Seatmandan:

I've read somewhere on Pinside about the IC chip on each individual slot PCB may need to be replaced

#4 4 years ago

That's the thing about the slot reels. There isn't much that can go wrong. It's a really simple mech, the weak point by far are those LM339's, and I know they have somewhat of a tendency to blow because it happened to me.

Still though, I don't understand, why all 3 and why at the same time? I guess I don't always have to get it, as long as I can fix it

I would start there if your comfortable.

Quoted from Seatmandan:

I'm assuming you socketed yours since you mentioned it. Also, the red LED on each board is lit solid for whatever that's worth...

#6 4 years ago

It's possible, it's not a bad idea to meter for power and make sure everything checks out.

Quoted from Seatmandan:

Do you think a power driver board issue would cause this?

#11 4 years ago

It could be anything really. But, I would not suspect that until you replace those LM339's. It sounds like that's probably it. I'd cross the other bridges when you come to them.

Quoted from Seatmandan:

Also wondering- could the root cause possibly be the CPU board?

1 week later
#13 4 years ago

Glad you got it sorted out. I'm not sure why this problem even exists, but at least it's easy to repair.

Quoted from Seatmandan:

It was totally the LM339s.

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