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Motors, that seem to have all of their connections intact, can they be fixed if not running? If so, how?
I have an expensive Cuisinart coffee grinder that only worked for about a year. There is no sound when I flip the switch. I think all of the wires are connecting to and from the motor. I took it apart and checked them all by sight and jiggling. They seem solid. There was some black stuff on the copper parts of the motor that I could easily reach with a cotton swab. I cleaned them with cotton swabs and isopropyl alcohol. Still not working...no sound even. The inner rod (I don't know the proper names for the parts) with its surrounding copper contact plates spins easily if I move it by hand.
I was able to fix another Braun coffee grinder that was dirty and wasn't making the contact from the springy copper plate to the contact with the wiring that went to the motor when the button (which gets depressed by plastic rods leading from a plastic button on the lid) was depressed. These issues do not appear to be the problem with the Cuisinart grinder.
1 Answer
- GoneLv 68 years agoFavorite Answer
The "black stuff" could be soot from burned insulation on the copper wire windings. If that is the case, it is not repairable. The "black stuff" could also be normal dirt or residue from the carbon brushes. If the motor is the "universal" type, it has carbon brushes that touch a rotating cylinder "commutator." Most small appliances have universal motors. A connection problem with the brushes and commutator would probably be temporarily fixed by jiggling things. If there has been no sound from the motor, that is probably not the problem. What has likely happened is that the grinder has overheated due to burned insulation or running it too long or too heavily loaded. Somewhere hidden next to the copper windings there is probably a small fuse (thermal fuse) that has blown. That can be replaced, but it is not easy to do and it may not be easy to find the proper replacement. Even if you replace it, it will just blow again if the cause is anything but unusually heavy use.