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Deze pagina gaat over verschillende soorten keukenapparatuur met een hoofdzakelijk mechanische werking, zoals mixers, blenders en koffiemolens. Ze kan ook gedeeltelijk van toepassing zijn op broodbakmachines of elektrische tandenborstels.

Samenvatting

Elektrische huishoudtoestellen die mixen, hakken, malen of pureren (of een combinatie daarvan) hebben altijd een elektrische motor. Problemen kunnen zich voordoen met de motor of de bijbehorende elektronica, of er kan een puur mechanisch probleem optreden, zoals etensresten die terechtkomen op plaatsen waar dat niet hoort. Demonteren kan soms lastig zijn, maar als u in het toestel kunt komen, is het probleem meestal vrij gemakkelijk te zien of te diagnosticeren met een multimeter.

Veiligheid

De meeste van deze apparaten werken op het lichtnet, wat uiterst gevaarlijk kan zijn als u niet weet wat u doet, vooral in aanwezigheid van water of vocht.

Sommige toestellen bevatten vrij krachtige elektromotoren, en zelfs de minder krachtige kunnen verwonding veroorzaken als vingers, haren of kleding erin verstrikt raken.

Mechanische problemen

Spindles and seals clogged with grease or food are very common. This may cause a jam which you can hopefully resolve with cleaning. Make sure any solvents or cleaning agents you use are food safe, or thoroughly rinse before returning the item to use.

Seals can leak, and this is often more problematic. Cleaning might resolve the problem, or there might occasionally be an O-ring you can replace, but once water or contaminants get into the works the chances of a successful repair are greatly reduced.

Cracked mixing bowls or jars may not be easy to repair as it will be hard to clean any contaminants from the crack, which may have become home to bacteria. You will need to clean and roughen the plastic in order to get any adhesive to stick, but if you can do that then 2-part epoxy resin may give a successful repair.

Motor problems

Devices of these types invariably use a universal or AC/DC motor, which provides a high starting torque. If you're not familiar with how these work, check out the Electric Motors page.

If you carefully inspect the wiring within the motor you should find that the current passes from one terminal through each of the field windings and the rotor (via the commutator) all connected in series. Using a multimeter (How to use a multimeter) check the resistance of each of the field windings and of the rotor. If either of the field windings shows as an open circuit then that is the fault. It could be a fractured wire or the winding could have burned out (in which case there are likely to be signs of overheating). In the case of a fractured wire the fracture may well be hidden, and even if not it may be very difficult to access or repair.

Look out for a thermal fuse. If you're unlucky it may be burried in the field windings, impossible to replace or even to see.

Check out the commutator and the brushes. The brushes may be worn and in need of replacement and the commutator may need cleaning with isopropyl alcohol.

Electrical Controls

First of all, check the fuse and check the mains lead for wear or damage. There may be a fuse within the device as well as the one in the plug. If you can see a thermal fuse, check that too.

There will often be some kind of safety interlock to prevent the device operating with blades or other moving parts exposed. There may be a mechanical problem with this, or with a switch associated with it. This may be a microswitch. These come in a small selection of sizes but with a number of variations. Nevertheless, replacements are easily obtained.

Faulty switches are fairly common. These may well be standard parts that you can find replacements for online. You may be able to disassemble a switch, but beware! They often contain a small spring which can take flight, a ball bearing that can roll away, or other tiny parts which fall out. Working out which bits go where and how to hold them in place during reassembly can be challenging.

Electronic controls can be subject to all the same kinds of faults as any other electronic device. Check for failed capacitors, or any other devices showing signs of overheating.

External links

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