Repair Old Bosch Electric Hand Whisk E-Nr MPQ1901GB/01

[G3NDI]

I hope the following notes may be of help to readers. My wife has a Robert Bosch electric hand whisk for probably well over ten years. The other day after using it the tool would not switch on next time. Looking at the obvious things first
I just expected the fuse, or slide switch in the handle, had failed after so many years. These were both OK, so I then checked the cable as there could have been a break in the ball swivel joint in the base, but no this checked OK with a multimeter and there seemed to be continuity. There was no burnt smell so it seemed the motor was OK.

Looking at the case I could see there would be a similar problem as I put on the Forum last year, Aug 26, for a Swan toaster plastic case – the manufacturers do not like things to be taken apart easily and repaired! No screws were visible and the manufacturer’s label was to one side so not hiding any screws. There was a seam all the way round the case and pressing and inserting a flat screwdriver it was just possible to see internal tongue clips at various places.

The handle seam was a little easier to force apart and eventually I managed to open the case, although a couple of small pieces of clips broke off. This was not a major disaster as some suitable glue would hold the two halves together if required.

Looking at the inside – see the images – the motor was clean, but what I thought was a slide speed switch in the handle was no more than a plastic assembly with a long plastic tongue running in a groove in the handle and up to a multi-pronged switch on the motor assembly holding some RFI components. As can be seen in the second image this flexible tongue had broken into three pieces. I checked the motor at this point to ensure it still ran.

There was no way to mend this practically as the groove was just sufficient to accommodate the tongue thickness. I had a tub used by chemists to dispense ointments as these are almost the same thickness and made of flexible plastic which would run in the groove. I cut a suitable length and carefully measured the length between the two end holes fitting over spigots on the slide and switch. It then occurred to me that I should just check on the off-chance on the Bosch web site in case it was listed and they might still hold spares, although it is an ancient unit.

Much to my surprise I was able to find the electric whisk on
< http://www.bosch-home.co.uk/customer-se … pare-parts >
listed under a long number on the label – E-Nr MPQ1901GB/01.
Their site had an exploded parts diagram and even had five of the parts, except the motor assembly and manual. The slide switch unit was purchased.

A little judicious easing enabled the new slide to be inserted. The beater eject button was interlinked with the green slide part and required further juggling. It was noticed the new slide had a spiral spring on an extra projection which had to be manoeuvred into place. Eventually the halves could be closed. The whisk now works once more.

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