Dead paper shredder. Has power but motor doesn't spin

[amateur_24]

The only circuit board in it, just has a switch and a mains capacitor (the yellow ones).

I have checked the brushes whilst they look short, they still make contact with commutator . I did try pushing them in with my multimeter probes( with the meter turned off) whilst activating all switches but still no life.

I have tested both limit switches.

I checked the fuses that are inline with the motor, they are fine.

There is 230v between each terminal of the motor and neutral but not across the motor. So that tells me the sliding power switch is fine and any inline protection is fine.




I have two questions

1) is the motor dead then?
2) what is the device in the image?

 

[Les Jones]

There is a break in the path between mains neutral and one of the brushes. the motor will be series wound and there will be one field coil between each brush and the supply. Measure the resistance of each field coil.

Les.

 

[MaxHeadRoom78]

Device appears to be a thermal trip, does it have continuity?

 

[Nigel Goodwin]

I agree, it appears to be a thermal fuse, it's over heated and blown - so it's done it's job.

 

[rjenkinsgb]

here is 230v between each terminal of the motor and neutral but not across the motor. So that tells me the sliding power switch is fine and any inline protection is fine.

That means 0V across the motor! One side should have 230V, the other 0V (to neutral) for it to run.

Shredders normally have a manual power switch plus at least one safety switch that is made when the shredder head is fitted to its bin, or the waste drawer is closed etc.

And, as others mention, a thermal cutout. That's supposed to auto-reset when the motor cools down, but can fail eventually.