Monday, December 26, 2016

A Switch, a Switch, my Kingdom for a Switch

High-end Panasonic NB-G110P Quartz Element Toaster Oven: it is well designed for a toaster oven in that the pushbutton power switch is low voltage, indirectly activating a solid state relay that energizes the heating elements. But it occasionally wouldn't energize the heating elements unless you tapped the power switch lightly.
It was an easy disassembly, the circuit board is cleanly laid out, and Panasonic makes parts available (hurray for them). The low quality electro-mechanical pushbutton power switch (SW15) is the one thing wrong, yet is only available by ordering an entire circuit board for about the price of a whole new toaster oven. (I think the part no. for the whole board is Panasonic ABR10A175 "Panasonic Pc Board".)



In this instance the switch was disassembled, cleaned and adjusted and reassembled, but not without tiny springs and other internal switch parts flying around and several hours of fussing and cussing with surgical tweezers: not for the faint of heart; soldering in a new switch would've taken a fraction of the time. It's working again, but it feels like a Pyrrhic victory. Despite being well designed this toaster oven (like many other things) turned out to be only as good as its weakest link, which in this case turned out to be its low quality pushbutton power switch.



NOTE TO Panasonic (and other manufacturers):
1) have component-level parts available (or provide information on and access to component providers)
2) Use a durable, high quality power switch (after all, that's the switch that's going to be used the most) OR design future devices so the switch is easily serviceable (or even unnecessary.)


10 comments:

  1. This is a long shot but just in case-- My beloved panasonic of the same model has a quirky "toast" button. Looking at your photo of the circuit board I assume it's similar to your switch issue except it's the little blue switch on the far left. Can I buy one of those somewhere and just swap them out? I too have tried fixing switches and had the little springs leap out and disappear so I'm not going down that road again. Thanks in advance!

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  2. The switch I replaced was on/off, the other switches (i.e. the toast button) are momentary. You'll have to figure out how to order that switch on eBay, alibaba, digikey, mouser, etc. Let us know what you find out.

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  3. hi! I'm having this same problem, and it looks like panasonic is now selling replacement buttons! https://panasonic.encompass.com/model/MSCNBG110P (scroll down it's the first item in accessories) pretty good price if it works!
    any advice on replacing the button? thanks!

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    Replies
    1. I'm pretty sure that's the cosmetic plastic button in front of the switch, not the switch itself.

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    2. You are correct. I ordered a "switch" and all I got was the plastic button in front of the switch. And that, only after they doubled the shipping price that I'd agreed to.

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  4. did you ever get a reply to this? I have the same problem and would buy the switch if I had any idea how to install it.

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    Replies
    1. Do you know how to desolder the switch and install another one? That's what I did.

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  5. I'm having the same problem with the power switch! Rather than go your route I would like to order the switch and solder in a new one. Where does one go to get a switch like this?

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    Replies
    1. Please email us directly at fixitclinic@gmail.com for an answer.

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  6. I replaced the SW15, and the problem has been fixed.

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