(Topic ID: 51656)

Firepower - 5101 RAM Chip Issues?


By dtown

6 years ago



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  • 38 posts
  • 12 Pinsiders participating
  • Latest reply 6 years ago by GListOverflow
  • Topic is favorited by 4 Pinsiders

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#13 6 years ago

IIRC from the data sheets max voltage for a 74XX chip is 7.5v. I checked this out when I accidentally put 12v down the 5v rail on my Barracora CPU when I had it on the test bench
I didn't want to risk any of them being stressed to just before failure point so I socketed and replaced them all. What a ball ache!

I recall there is one 4000 series chip on there that is rated to about 15v. That's the only one I didn't swap.

Andy

1 week later
#31 6 years ago

>>First, shows how far the kicker travels when the switch is activated manually.
>>Second, shows where the kicker is at rest.
>>Third, shows how far the kicker travels with two balls. Three balls, even less.

That seems OK

>>Grounding out the coil with three balls will push them one at a time over the trough hump but >>not all three together.

The outhole will never have more than one ball at a time. Even at the end of a game when two locked balls are kicked out they won't land in the outhole together. I don't see the fact that it won't kick three balls at a time up the trough hump as a problem as it will never occur.

>>Another thing is eventually the switch will no longer activate the kicker. I can take the balls >>away and try to fire it manually and it doesn't fire. Is this a safety feature or, if not, what >>could be the cause? Turning the game off and on gets it working again.
>>Nothing looks misaligned. Thoughts?

Maybe but I haven't come across it before. Perhaps a system6 expert could chime in When the switch stops working try registering a few playfield switches to see if that then makes the outhole switch start working again.

Andy

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