Hi Guys,

I'm attempting to repair a treadmill which has a faulty motor speed 
controller.

One leg of the 240v ac goes onto the board, through a 20 amp fuse to one leg 
of a bridge rectifier  ...  to supply the gutsy dc motor.

The other side of the ac in  ...  goes through a device which has two legs 
... is 20 mm in diam and 4 mm thick  ..  to another leg of the bridge 
rectifier.

This device is open circuit, has bulged a little and appears heat 
distressed. Despite close inspection I can find no identifying markings at 
all.

>From the fact that it has to pass many amps at 240v ac  ..  I assume it is 
some sort of polyswitch  ...  but I have not been able to find specs on any 
240v ones that can handle more than a couple of amps.

Can anyone point me in the direction of a device which may do the job 
please.

I did bridge it to see if it would run ok (after close inspection of the 
rest of the unit) and it ran quite happily. The machine had been clogged 
with dust and fluff  ..  so I suspect that overheating was the main cause.

Regards,    Roger 

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