KENWOOD PROSPERO KM280 NOT WORKING..WHY?

Hi, Peace upon you all.

This afternoon, my wife's food processor Kenwood km280 suddenly dead..she planned to prepare Dorayaki for us all, to eat in the evening.

Fig 1: Kenwood KM280 mixer/food processor

Unfortunately, after pours mix all the ingredient into the bowl, switch On the main plug and adjust switch knob to no 1 speed, nothing happens. After many tried, after referring to the manual that comes with this food processor (KM280), she gives up and asks me to do something about it.

The first step to troubleshoot the problem is to check the power from the main plug and also the fuse. The outcomes are all well and working fine.

Second, check the internal connection and gearing, visually. the reason is to make sure no visible damage to the cable and gearing. This will require disassembly of the top cover. It can be done by removing six screws under.

after top cover is removed, internal circuits, motor, and gears (figure below) can be observed for any damage. Fortunately, there nothing obvious to the gearing and motor (refer to fig 2, fig 3 and fig 4)

Fig 2: internal circuitry, safety switches, motor and gearing of KM280

There are three safety switches in this KM280. One is for latch switch (located on the left side of KM280) to lift Topside of KM280 up and down, to remove and install the bowl and beaters. This seems fine to me too. Checking using multimeter show continuity when it locks to the position.

Fig 3: Mixer gearing of KM280

The other two safety switches located near blender holder-high speed outlet (fig 4) and near the food processor holder-medium speed outlet (fig 2, middle left in the pic).

Fig 4: high-speed outlet gearing and safety switch of km280

 And both also looks fine, visually and testing with the multimeter (continuity test) showed the switch working as it should.

Considering that all possible culprits are tested fine. So, I power On the KM280 again with both top safety switch are pushed by hand...and the result is it working.

Attaching the medium speed outlet cover and high-speed outlet cover also make the KM280 works.
However, when I attached the blender to the high-speed outlet, and turn the knob on, this time KM280 is not working.

So, now I know where is the problem coming from. Looking at the bottom side of the blender..there is the white plastic stick that will push the safety switch when the blender is attached to the high-speed outlet. This white stick is linked all the way to the top of the blender and requires the cover to be attached properly

Fig 5: Blender jug. Bottom side with a stick that will push the safety switch

 Turn out, my wife did not close the blender cover properly as in fig 6. Thus, causing the white stick to lift up slightly. This will result in an open circuit to the motor supply and KM280 will not able to operate. This also cost me half an hour to check the faults.

Fig 6: blender jug. Topside with the cover. The arrow should align with the handle

Therefore, it is best to check and verify all the possible fault before throwing it out or sending to the repairman which will cost you a lot of money. Luckily, in my case, there are no faulty to the KM280..its just been handled wrongly.

I hope this will guide anyone who have a similar problem. Thanks

**Having trouble assemble this Kenwood? check here