(Topic ID: 132850)

Firepower Resurrection


By fattdirk

4 years ago



Topic Stats

  • 63 posts
  • 16 Pinsiders participating
  • Latest reply 2 days ago by mrm_4
  • Topic is favorited by 13 Pinsiders

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There are 63 posts in this topic. You are on page 2 of 2.
#51 4 years ago
Quoted from fattdirk:

My suspicion was correct! Right flipper coil had a bad diode. Measured it and it was open. I replaced it with an new 1n4001 and now the sound is perfect.

Sweet!

Did you typo the diode you used? 1N4001 will not last long, if at all on a flipper coil.

#52 4 years ago
Quoted from Schwaggs:

Sweet!
Did you typo the diode you used? 1N4001 will not last long, if at all on a flipper coil.

What should I have used? I did use the 1N4001 because that's the first one I saw in my parts bin. I don't know that I've ever had a problem with one of these on a coil in the past. They're rated for 50V @ 1 Amp. It's just shunting the EMF.

#53 4 years ago

I think general consensus is to use 1N4004 or stronger. I have some 1N4007 that I use on coils but I think that is overkill. The diode does not need to suppress a ton of current but it does have to suppress relatively high voltage.

#54 4 years ago

It's really cool reading threads like this. Great job on resurrecting another dead pin.

How do you like the game?

#55 4 years ago
Quoted from Schwaggs:

I think general consensus is to use 1N4004 or stronger. I have some 1N4007 that I use on coils but I think that is overkill. The diode does not need to suppress a ton of current but it does have to suppress relatively high voltage.

Ordered some 1N4007. I'll throw it in there when it comes. I didn't think about the high voltage.

Quoted from Geocab:

It's really cool reading threads like this. Great job on resurrecting another dead pin.
How do you like the game?

Thanks, the game is wicked. I really like it. I rerubbered it and threw a bunch of wax on it. The new flippers really get the ball moving. Unfortunately when my wife and I were play testing the game and it started having a bunch of phantom switch hits. So back to the bench with the board for further troubleshooting. Whoever ends up getting this game eventually is going to have a rock solid machine!!

I hope I have the parts to repair the switch matrix. This is really cutting it close for the party as I need to bring the machine over Friday to set it up.

#56 4 years ago

It would be interesting to look at the EMF feedback with a scope. I would imagine you want a 1n4004+ diode though.

#57 4 years ago
Quoted from barakandl:

It would be interesting to look at the EMF feedback with a scope. I would imagine you want a 1n4004+ diode though.

It's pretty interesting that the EMF was triggering the sounds.

I probed the switch circuit and the SN7406 at IC18 is bad. I think I'm going to go ahead and replace the one at IC17 also just for good measure. I don't typically do that, but I've had a few of these system 6 games that I've worked on and every time I blow a 7406 I need to replace the other one not too long after.

While I wait for my chips to come, it gives me a chance to soak the legs in evaporust.

#58 4 years ago

So, I started reading up on your use of the logic probe and decided to practice my Mandarin Chinese instead.

#59 4 years ago

Wow great trouble shooting and documentation. This will definitly help me and others in the future.

#60 4 years ago
Quoted from fattdirk:

It's pretty interesting that the EMF was triggering the sounds.
I probed the switch circuit and the SN7406 at IC18 is bad. I think I'm going to go ahead and replace the one at IC17 also just for good measure. I don't typically do that, but I've had a few of these system 6 games that I've worked on and every time I blow a 7406 I need to replace the other one not too long after.
While I wait for my chips to come, it gives me a chance to soak the legs in evaporust.

You can test the 4049 and 7406 in game conditions and figure out exactly what is bad. The other side is i am really handy at soldering and can socket and replace all four of the switch matrix chips in less time than a thorough logical testing of switches. A lot of time i do some testing with known good boards to rule out a driver board problem and then just replace the associated components. I can't recommend that approach for everyone though. Once you fix so many of these boards you get a good instinct for whats wrong.

You did a great job of logically working through everything. I like posts like this. A+. Have fun =D.

Andrew

#61 4 years ago

Pre party preview. Kids are enjoying it while we set up.tmp_27046-20150724_190738-1989863703.jpg

1 month later
#62 4 years ago

Congratulations and nice work from here Argentina!!! Let me tell you that the last week I bought my FIREPOWER (of course it doesn't work) and I´m learning a lot from your post.

4 years later
#63 2 days ago
Quoted from fattdirk:

Ordered some 1N4007. I'll throw it in there when it comes. I didn't think about the high voltage.

Did you ever end up swapping the diode?

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There are 63 posts in this topic. You are on page 2 of 2.

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