The Craftmans Shop > New from Old

In-Sink-Erator resurrection

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russ57:
Not that I wish calamity on you, but I do love when you have broken stuff to repair - always entertaining and educational..

-russ

awemawson:
Thanks Russ  :thumbup:

Don't worry there's always something breaking round here to keep you amused :bugeye:

awemawson:
So it seems to be working fine so far - had a few GOOD cups of tea - no taint in the water flavour and it seems to be controlling it's temperature OK, so I decided to try and change the adjustment pot in the original unit.

Opened it up, exposed the PCB, decided as the mounts for the new pot are slightly different, to cut the legs that are the ends of the track and leave them in the PCB for possible use to solder the new one to. Then I un-soldered the third connection that is the wiper - this is in fact two common connections presumably to give better mechanical strength  :scratch:

Having got the Pot off the PCB I measured it's resistance - 28.3 kOhm . Argh - the replacement is 50k (well 47k being a standard value) BUT THE ORIGINAL SAYS 50K on it's body  :bang:

Now as the wiper mechanism had collapsed I thought that part of it might be shorting out the track and giving the low reading. A careful bit of dissection with a scalpel exposed the bare track releasing the remains of the wiper - it measures 28.3 kOhms  :bang:

So I'm in a bit of a quandary now - do I put the 47k pot in, or try and get a 28k - well 27k is the nearest preferred value - or has the original track gone low resistance. If it has I've never come across such a failure mode before, they always go high resistance  :scratch:


 

RussellT:
I'd be inclined to go with the 47K.  I can't believe they fitted pots marked 50 believing they were 28K, so they must have thought it was a 50K.  Also unless it's more complicated than the PCB looks the 47K will give you all the values you could get from a 28K.

Russell

howsitwork?:
Andrew

what does the rebuilt one have as it's value if you can access it?

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