The Shop > Tools
Warco WM180 problem
PK:
So the good news is: That is a very common, vanilla, part. RS carry them, http://www.maplin.co.uk/p/4k7-andohm-miniature-linear-single-gang-potentiometer-jm70m . No pun intended, but you may need to tweak your knob to suit the shaft....
hopefuldave:
As has been said, standard part - you could use a higher-rated (e.g. 2watt) pot in its place, they tend to be longer-lived, more rugged, slightly more expensive...
While you have it open it's worth checking all the electrics, particularly eaarthing/insulation and the ratings on microswitches, and be aware that the speed pot isn't isolated from mains and can give a nasty belt or if the terminals touch earthed metal will kill the speed control pcb.... A plastic-bodied pot is the Chinese way to make it 'safe'! Use a plastic, not metal, knob and put an O-ring between knob and panel to exclude dwarf and fluids while you're at it.
Dave H. (the other one)
GRIFFIN:
AAAAGH,
The bad news is, The ones at RS and Maplin are of carbon track type and as such they are rated at less than .5 watt. I bought one for a couple of quid to try but it didn't work. Incidentally, the motor turns when I connect the wires without the pot, so the fault is not in the circuit board or the motor its self.
The one I need is WX 14-12 wire wound and rated at 3 watts, 4k7 ohms +/- 5%
So if you have a spare John, or anyone else for that matter, it would be greatly appreciated.
Cheers, Griff.
Sea.dog:
If you get stuck, there are several on eBay, all from China however, and rated at 5W.
John Rudd:
It wont be a wirewound pot irrespective of the board.
I suspect you have a problem elsewhere...
Can you post up a photo of your board....please
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