Repair/Restore my Nintendo M82

Ok, with a quick search i've found the capacitor


RIFA PME 271M METALIZED PAPER CAPACITOR 40/085/56 .47 UF X2 250V-SH


:sneakiness: £1.33 to buy but postage is stupid!


http://www.ebay.co.uk/itm/NOS-RIFA-...pt=Vintage_Electronics_R2&hash=item3380262693

 

Also there's a filter inductor right by it which looks damaged (the smaller transformer look-a-like part close to the blown capacitor).

 

The small blue thing with the capacitors blood and guts on?

 

Ok, I get it the thing on the left of this picture



There's the numbers on here:

DC 88
76008 F

 

I'm trying to figure out the role of this capacitor, I think it's a EMI Suppression X2 Capacitor.


"EMI suppression capacitors are used to suppress any noise from an electronic device by reducing the input impedance of the device."


This would suggest this part blew up to stop the whole board going up in flames...


Now it's a case of finding out what caused the problem in the first place... Would this be the Filter Inductor?

 

A voltage surge probably caused the suppressor capacitor to short out, then causing the inductor (the part which looks like a transformer) to melt a bit.

It's possible that you have to replace the inductor too. Both form a EMI suppressor circuit. Apparently the PSU fuse is after the supressor so it was not able to protect the inductor.

 

What would cause a voltage surge, would it be something on the board that's caused this or a problem with the wiring in the house it was tested in?

I'm thinking it could have ignited dust as the PSU was mega dirty.

Any idea on what Filter Inductor I need, I can't find it...

 

I was about to desolder the Inductor today to see if it had a part number when I just realised that I can't actually see any damage to it.

The bottom of the inductor is electrical tape - Do you still think it's worth replacing?

 

Take a picture of it removed from the board. It looked like it did melt down a bit.

 

The below picture shows the Inductor removed from the board



Here is the top and bottom of the Inductor




I have tried to get a decent shot of each side of the Inductor but some have come out slightly poor






There is not model number on there that I can see :tranquillity:

 

I've tried to do some clearer pictures here (Left the others on the above thread just incase you can spot something there.







Here's the top and bottom part of the Inductor just for good measure

 

Oh right ! it's fine ! Only thing you can blame it on is it's being old.

The previous pictures didn't allow for discerning that.

It's a inductor type where the two poles of the mains voltage are winded in parallel. It's meant to absorb all high frequency interference generated by the main circuitry of the PSU and prevent it from irradiating through the mains cable. So does the capacitor which used to sit right by it.


So it's supposed to work like this:
Mains live > 1 ----- 2
Mains neutral > 3 ---- 4

Both inductors in it are identical.

 

That's a relieve! :encouragement:

So I'm assuming I just need to order the EMI suppressor?

The details of the one that exploded are:

RIFA PME
271M Metalled Paper Capacitor
40/085/56
0.22UF
250V-SH

The ones I've found on eBay are slightly different

RIFA PME
271M Metalled Paper Capacitor
40/085/56
0.47UF
250V-SH

Am I right in think because it's a higher UF that it should be ok?

 

You don't need to order the exact same part. You have to order a EMI filter capacitor of exact voltage and microfarad rating (250V .22uf)

Brand and appearance should not be very important, unless you're "anal" about restoring it while keeping the same look it had when it was made.

 

Cool, I think it would probably be better to replace with something newer...

Would this be a good replacement?

http://www.ebay.co.uk/itm/Metallise...mponents_Supplies_ET&var=&hash=item35c45ea7ba

Also does the climate category not matter?

 

it has to be the proper type, used for EMI filter. That kind usually has a square plastic box which it's encased inside along with a epoxy filling.

Edit:

These usually have a ton of certification logos on them.

 

God damn, I think this might be tough to find...

The only thing that I can find that might work is this:

http://www.maplin.co.uk/metallised-paper-rfi-class-x2-capacitors-98166

It doesn't say EMI Filter but the description is this:

• Particularly high reliability against active and passive flammability
• Excellent self-healing as well as high voltage strength
• High degree of interference suppression due to good attenuation and low ESR
• For temperatures up to +110°C
• RoHS compliant (2002/95/EC)

Class X2 RFI applications to meet EMC regulations. Ideal for capacitors connected to the mains between phase and neutral and neutral or phase and phase conductors. Installation category II in accordance with IEC 60664, pulse peak voltage <2.5kV

 

The order code N70CN looks like what you need to get.

But hey you know you can salvage these from old dead PC power supplies, do you ?

 

I don't have an old PC power supply LOL

I just called Maplins and they have the N70CN in stock so will order that, pop it in and test (while hiding in behind the door

Thanks for your help mate - I'll upload some pictures when I get the part.

 

Ok so I went to Maplin this morning and collected the N70CN chip along with some PCB cleaner to clean up the board.

With no clear indication which is positive and which is negative (No short and long leg) I managed to get the cap to fit the slightly narrow holes which I'm hoping is the correct way.

I'm basing this off of the position the last chip was in.



I've posted an image and will test as soon as I hear peoples thoughts on which way around the cap should be.