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MikeB

Mpu3 burnt plug

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Morning all,

I know it's been covered before, but I can't bloody find it on here!

As you can see from the photo, ihave two machines burning on the main power plug to the mpu. Could anyone help with the cure please?

20190413_094801.thumb.jpg.0ee4f82e76497787bf6bce9e2ffd3460.jpg

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Chop the 2 wires off, join them together and add cable to make it longer to reach the underside of the mpu3 and solder the end to ground on the board

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1 hour ago, Andrew96_ said:

Chop the 2 wires off, join them together and add cable to make it longer to reach the underside of the mpu3 and solder the end to ground on the board

Perfect! Thanks for the answer Andrew, just to clarify, we are joining to a ground on the pcb?

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Yes it is always those 2 wires that burn up, they not only carry the return current from 12v board power, but also return current from the reels AND all the lamps, coin mech as well, so they are under a lot of current passing all the time which results in increased resistance between the plug and socket which causes it to first get warm then with time passing they get hot then they burn up!! And that’s what happens!!!

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A common fault really.

I had to do that on one of mine.

Don't forget to clean off those 2

burnt pins as well,as this makes

for poor contacts and the lead will arc

on those pins and further destroy the plug.

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3 hours ago, Line Up Chris said:

A common fault really.

I had to do that on one of mine.

Don't forget to clean off those 2

burnt pins as well,as this makes

for poor contacts and the lead will arc

on those pins and further destroy the plug.

Yes I will Chris! I will get them nice and clean 👌

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Mike the pins can be replaced .Bob has had some success in finding replacement crimps .the reroute /bypass method works very well but in effect hard wires your psu to the mother board so slightly more hassle when replacing the board if needs be .on the re routing wires you could fit a couple of Male/female spade connectors so you can simply pull them apart instead of a desolder job every time .

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11 hours ago, sulzerned said:

Mike the pins can be replaced .Bob has had some success in finding replacement crimps .the reroute /bypass method works very well but in effect hard wires your psu to the mother board so slightly more hassle when replacing the board if needs be .on the re routing wires you could fit a couple of Male/female spade connectors so you can simply pull them apart instead of a desolder job every time .

Cheers for the info Nick, are you saying that because the crimps aren’t making a good connection, and causing the short?

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Exactly that  Mike as per what Andrew mention too .

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