(Topic ID: 235380)

F14 tomcat kill yagov misfire

By Zero4199

5 years ago


Topic Heartbeat

Topic Stats

  • 59 posts
  • 7 Pinsiders participating
  • Latest reply 3 years ago by GRUMPY
  • Topic is favorited by 1 Pinsider

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#1 5 years ago

So it's been an ongoing issue, getting worse.
Seems like the left flipper might be triggering it.
The kill yagov goes off on it's own.
Sometimes I hear the kick back fire, sometimes not.
Its random one only happens 20% of the time or so. I tried a switch test and cant find any other switch triggering it. I think its switch 55.

I looked around and found a missing part. Can this be the problem?

See attached pictures

Thanks

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#3 5 years ago

I tried banging on the machine in different areas and had no luck triggering.
During the switch test, the flipper will not cause issue, only during game play.

#6 5 years ago

tried it and you're right. It only does it when the balls are locked. I can check it during game play but not during a switch test.
How do I do a switch matrix test?

Thanks

#8 5 years ago

Wow, that is a long and difficult read.

#9 5 years ago

I can not get it to happen during switch test.
Only in game play.
With the glass off if I move the flipper by hand to the EOS? Contact, it will trigger the kill yagov 1% if the time.
40% of the time during multi ball.
I guess my next step is getting a jumper wire and testing the board with the switch plugs disconnected.

#10 5 years ago

I did a CPU switch test with a jumper and everything worked as it should.
I discovered that the switches on 1J10 pin 2 are the switches that are acting up.
Slam tilt [occasionally problem]
Right flipper e.o.s.
Middle ramp [occasional problem]
Top right loop
Kill gen. Yagov [occasionally problem]
Left flipper e.o.s. [seems to cause problems]

I think they are all linked to the same white with purple wire.

Where do I go from here?

Thanks

#11 5 years ago

I went through the wire harness and looked through all the connections with slight wiggles here and there. Found nothing.

Then I removed the black plastic ramp to look at the yagov kicker and it was loose. I tightened the four screws that held it in.

It is working better now with only one or two fantom fires during a long game.

Must be a wire rubbed through somwhere.

Any other ideas?

#13 5 years ago

I went through and checked the switch diodes.
No problems found

#14 5 years ago

Is this ok?

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#15 5 years ago

Can the LED lights mess with it and cause these issues?

#17 5 years ago
Quoted from GRUMPY:

Did you do a switch test in the menu, with the balls removed, insuring that only one switch shows on the display for for 3 cycles.

Tied all this in multiple combinations and leangth of time. And bumped the board in different directions with no issues.
I never saw a switch triggered that was not touched. It's odd to me that it will only happen during game play.

#19 5 years ago

I've read about 25 pages of the f14 fan club topic and I believe you are right about the SCR.
Where is it, and what does it look like
Thanks
Mike

#22 5 years ago

Wow, .35 cent part.
Is there a way to test the old one?
Is there a write up or video on replacement?
Thanks very much for the info so far

#24 5 years ago

I suppose this is the part in question

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#26 5 years ago

Yikes.
Didn't see that

#27 5 years ago

This?

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#29 5 years ago

Do I order the 2n3904 in case I need to replace it?

#30 5 years ago

Order 11 of each.
5$ minimum.
Wish they sold solder suckers or wicks too

#32 5 years ago

Parts are on the way, what tools do I need?

#34 5 years ago

I can ask around

#35 5 years ago

Maybe I can practice on some old boards.

#38 5 years ago

I've got a line on a guy that I reached out to.
Waiting to hear back.
What does a repair like this cost?
$100?

1 week later
#40 5 years ago

I've been practicing.
Everything came in.
I ha e the board out and there has been work done before

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#41 5 years ago

This area behind the white things was hot at one point

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#42 5 years ago

This looks rough.
If this doesn't work, is there places to buy new boards?
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#45 5 years ago

Ok. I'm ready to get started.
Which one is the 10 pin? The end with the dot or the other side?

#48 5 years ago

Old one is out

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#49 5 years ago
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#50 5 years ago

Looks good to me.
Time to try it out

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#51 5 years ago

Pin 10 not touching

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#54 5 years ago

Its installed in the machine and has fixed the gameplay issue.
Thank you all very much. I would have never been able to fix this problem without your help.
Its forums like this that make the internet a tool that shares knowledge in an interactive way that nothing else comes close to.

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#55 5 years ago
Quoted from GRUMPY:

Do you think that the old resistor pack was cracked in the middle before you removed it?

Not sure, but it is very brittle.

#56 5 years ago
Quoted from kermit24:

What happened to pin 10?

I snipped it off. I was told the old part has capacitors in it and the tenth pin is a ground to reduce noise.

The new part has no capacitors in it and the ground is not needed.

I think...

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