Products > Test Equipment
Blew Up My First Oscilloscope!!!
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Electro Detective:

Ha, just copped the same RIFA PITA myself on a kitchen appliance... operating in magic smoke mode   ;D

had all the symptoms of a burnt out motor aka 'toss it time' 

Still, I opened it up for parts scavenging purposes and what a MESS  :palm:  brown gunk EVERYWHERE,
the RIFA must have popped during the loud motor running, then started to smoke gradually. 

Folks, the smell was unbelievable, I had to work on the sucker outdoors with gloves and lots of residue free contact spray and toothbrush to loosen and wipe up the all crud.
If you don't mop up all of it, it will smell like forever, what the hell is in those stinkers ?   :scared:


Amazingly the bridged resistor across the Live/Neutral legs and the small 250volt blue cap thingy with one leg to earth/ground were both unscathed and like new, tested and re-used

Repaired kitchen appliance is 30 years young, nice clean motor, heavy duty switch work, hopefully should see another 30 with the new X2 cap in there   

FWIW Jaycar and Altronics in Australia regions have X2 replacements and cheap, smaller in size, and apparently no quality comebacks over the years.


I got the the same value 0.1 that was on the trashed RIFA so as I could reuse the same resistor and cap combo with it,

not sure what the difference would be with other X2 values,
more or less suppression at 50 hz, is bigger better, etc  ?   :-//


SoundTech-LG:
just another load of fried Rifas going back... :palm:

Electro Detective:

Why the RIFA label and not REEFER ?   :-//

That is how they eventually perform, right ?  :D

PixieDust:
Does anyone know how to remove these plastic screws? They appear to be quarter turn to loosen them, but then they don't pull out easily after that. Should I be pulling harder?

If you turn it 180 degrees, they make the receptical bulge out again, making them increase in diameter and hence hold the board in place.

Scrap that, they just need to be turned, not removed.
PixieDust:
Job done! Replaced the two RIFA with some 100nanoFarad ones. Not 0.068microFarad but I'm hoping it should work. Re-assembled it, turned it on and passed all the tests.

The replacement capacitor in the image is of a different value, but the one I installed is of the same form.
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