(Topic ID: 195811)

W?D Keeps blowing 12v opto fuse F116. Any Suggestions?

By Ericpinballfan

6 years ago


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#8 6 years ago

I keep LM339 in my parts stock for so many issues. On a switch matrix a slight shot can hit then and cause strange issues.

But the chips you get might still suck so make sure you install sockets.

Also, the first thing I ask when I hear 12 volt fuse is "mods". Did you install any mods? Under cab lighting . . ..

When I hear those poppers popping and I know the 12v fuse is blown I think mods. The 12v on an 90s Wms game was used for very little and now people are stressing that supply.

#12 6 years ago
Quoted from Ericpinballfan:

... Socketing the chip makes complete sense. However, wonder what the fail point will be per chip, weeks, months, years? ...

No "however", is just makes sense to install sockets.

Board makers don't install socket to save pennies. The chips are put on a board and a wave solder machine solders everything quick and easy. This saves them the cost of the socket and the extra step if inserting the chip in the socket.

You are going to be taking a soldering iron to each leg of that chip. While it may be quick (unless you are not very good) you are not going to be as fast as a wave solder machine. You are exposing the chip to heat. Would you rather heat a chip or a socket?

What happens when if the chip blows or the inevitable "CRAP, I installed it backwards!" happens? Now you are exposing your board to heat twice more, once to remove the old chip and once to insert the new. Now you are risking lifting the traces.

As for the larger question I have not looked at the overall issue or solution on the stepper board.

#17 6 years ago
Quoted from Ericpinballfan:

I meant to say. Once the LM399 chip is socketed, how long till the LM399 chip fails again?

Seatmandan
Yes, all intel on this bug helps. Thank you for your input. I will be trying all of these tips and posts from above and reporting back.
Trying to also get to the bottom of this W?D glitch.

Hopefully never.

Good luck. Let us know how it goes.

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