It seems my SMEG kitchen range is getting older… at least it is again showing some issues. The right hand side front induction field is sometimes coming on, intermittently, only to shut off quickly again. Normal operation is no problem, but when it is switched off, it doesn’t remain fully switched off all the time. Could be dangerous if some pot is left on the induction field, and the range decides to switch it on by itself… a praise to all the old-fashioned switches that completely took power off the appliance.
First we need to find out the source of the issue, is the it controls electronics, or the switch? To test, I opened up the front panel (easy enough, it is just 8 screws…), and switched the cables going to two of the front panel switches. And, as it turns out, the issue also switched. So it is probably a defective switch rather than any issue with the electronics. That’s good news.
For about 35 EUR, I got a new switch, as it turns out, it is no switch put a potentiometer…
… and a quick exchange fixed the issue. Now let’s do some study of the old part.
Made by printing some conductive composite on a circuit board. Looking good. I can’t see any issue with it even under the microscope. Maybe just some contact issue, the contacts also don’t look clean.
So I will clean it all up thoroughly, bent the contacts a bit to give it slightly more force, and keep it as a spare.
These potentiometers aren’t cheap, at least the use good engineering plastics for it, like, glass fiber reinforced materials.