(Topic ID: 70838)

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By wayout440

7 years ago


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  • 4,862 posts
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  • Latest reply 1 day ago by WhiskeyTango
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There are 4862 posts in this topic. You are on page 98 of 98.
#4851 3 days ago

I also have an original power supply and flipper power board.

#4852 3 days ago
Quoted from Aniraf:

I thought about the two old flasher bulbs I still had in there. I removed those, just wondering if something in that circuit was wonky. Now with those removed the fuse does not blow, but also none of the solenoids work (except flippers).
Are you thinking it would be a transistor on the power board? I cannot for the life of me remember how to test that board properly or the solenoid voltage coming out of it.

You need to test the fuse with a meter, it is most likely blown again. Before you turn on the power again, disconnect 1J-11, 1J-12 and 1J-19 from the cpu board. When you turn it on now use a meter and check for dc volts at both sides of F-2 and F-4 fuses. If you have 32-34 volts on both fuses then you can reconnect one of the 3 connectors back while watching the fuses. If there was no sparking, then connect another connector. Let me know which connector causes the fuse to blow.

#4853 3 days ago
Quoted from GRUMPY:

You need to test the fuse with a meter, it is most likely blown again. Before you turn on the power again, disconnect 1J-11, 1J-12 and 1J-19 from the cpu board. When you turn it on now use a meter and check for dc volts at both sides of F-2 and F-4 fuses. If you have 32-34 volts on both fuses then you can reconnect one of the 3 connectors back while watching the fuses. If there was no sparking, then connect another connector. Let me know which connector causes the fuse to blow.

It is 1J-12. I’m looking now!! Ty for the lead, hopefully I find it.

#4854 2 days ago
Quoted from GRUMPY:

You need to test the fuse with a meter, it is most likely blown again. Before you turn on the power again, disconnect 1J-11, 1J-12 and 1J-19 from the cpu board. When you turn it on now use a meter and check for dc volts at both sides of F-2 and F-4 fuses. If you have 32-34 volts on both fuses then you can reconnect one of the 3 connectors back while watching the fuses. If there was no sparking, then connect another connector. Let me know which connector causes the fuse to blow.

As suspected, the flashers are somehow messed up. I don’t see any faulty/burned transistors or any crossed wires? I removed the two old flash bulbs (the rest are LED) and basically cut that circuit under the sockets. It still blows the fuse. I’m confused :/.

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#4855 2 days ago
Quoted from Aniraf:

I don’t see any faulty/burned transistors
[quoted image]

You'll need to test the associated transistors with a Multimeter. They dont always look burnt when they go bad.

Here's a quick easy way to do it.

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#4856 2 days ago
Quoted from FLASHBALL:

You'll need to test the associated transistors with a Multimeter. They dont always look burnt when they go bad.
Here's a quick easy way to do it.[quoted image]

TY! That is very helpful.

What about the little ones that do not have the metal tab on top?

#4857 2 days ago

That is the associated pre-driver for each transistor. Yes you should check them as well. 2n4401 if my memory serves me right.

Here's the process for them. The process for most of this is under General on Pinwiki.
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#4858 2 days ago
Quoted from Aniraf:

As suspected, the flashers are somehow messed up. I don’t see any faulty/burned transistors or any crossed wires? I removed the two old flash bulbs (the rest are LED) and basically cut that circuit under the sockets. It still blows the fuse. I’m confused :/.
[quoted image]

Here is a quick easy way to test. Turn on the game, black lead under the ground braid. DMM set to ohms, J-12 removed. Touch each pin of J-12 on the CPU board with the red lead. Does any pin show zero ohms? No, then change DMM to DC volts and use red lead and test each pin of the J-12 connector harness. Replace the bulbs you removed. Does any pin not have 34 volts?

#4859 2 days ago

Awesome, thank you both! I’ll test ASAP!

#4860 2 days ago
Quoted from WhiskeyTango:

Got some leftover parts from my playfield swap if anyone is interested. Here are some pics of the bigger stuff.

Interesting that the grid still looks good

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#4861 1 day ago
Quoted from cad-kid:

Interesting that the grid still looks good
//<![CDATA[
window.__mirage2 = {petok:"d8a15c87a05696c83b1144b700455ca04219383f-1631746993-1800"};
//]]>

[quoted image]

Mylar works wonders... mine looks identical.

#4862 1 day ago
Quoted from cad-kid:

Interesting that the grid still looks good [quoted image]

Yeah, it's in pretty good shape.

There are 4862 posts in this topic. You are on page 98 of 98.

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