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Should I self repair the TM5 scales?

The scales stopped working by just showing 0000 or max limit weight figures when pressing the lid down. A few days later the scales seem to have recovered its sensitiveness yet it appears to be too sensitive and readings show changes even when untouched.

Is it at all worth attempting to repair it or send it to be repaired?

Risposto! Visualizza la risposta Anch'io ho questo problema

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I had that exact same problem myself. The scale on the thermomix TM5 went from 0 to MAX, after some pressure on the thermomix.

In addition to this I had the selector button, which jumped from time to time when selecting times and temperatures.

I fixed it without really understanding how.

I disassembled the thermomix, until I got to the weight sensors, I didn't see any kind of residue anyway I blew on the inside of the legs, although the sensors are solid pieces of aluminium.

When I reassembled the Thermomix, everything worked perfectly, just as it did on the first day.

If it helps anyone.

da

To fix this issue, Start the TM5, start the Motor and unplug the TM5 for at least 15 Minutes (hard shutdown). The scale recalibrates after the restart and should work properly.

da

Anyone know how the scale actually works? I've had the same problem (0-Max) and after opening the Thermomix and cleaning out legs and contacts it seemed to work ok, but the measurement it gives is not correct. it shows about 25% less. (measuring cup should be 40g, but the thermomix gives me 30g only)

da

I have same problem.. the measure is not correct. have advise to fix it up?

da

If you tried everything that is listed in this thread and its still not working then you might be out of luck and have to send it in for repair.

da

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Soluzione Prescelta

Dear Jayeff,

Thanks for your reply. I had already visited ifixit (in fact that’s where we are!) and the link to Australia forum was of little use but for realising I am not alone. This leaves me with your suggestion to have it repaired by them. Not sure I am happy with that as warrant has expired. I had the thermomix wrapped up as it came on its first day for two years and only started using it 7 months ago. A 7 month life for a 1200€ device is a poor performance Mr Thermomix TM5!

Based on forums and personal experience I shall advise friends to go for cheaper alternatives.

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Hi,

If it is still covered by the manufacturer’s warranty, I suggest that you get it repaired by them.

If it is no longer under warranty, here’s a link to the ifixit Thermomix TM5 Repair guide which may be of some help in opening the device to ascertain what the problem may be.

This link may also be of interest. It seems that you are not alone in having problems with the scales in this device.

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Dissasembly Thermomix. Unscrew the 3 screws from the weight sensors. Set the sensors correctly and tighten the screws. The scale will work properly.

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Also had the same fault with the scales not working. Disassembled unit removed the sensor feet, contact cleaned all parts and re assembled. All working ok now. Super happy

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Facing the 0000/max scale issue, after some reading I decided to look into our TM5. I found somehow strange that some people fixed it “cleaning contacts” or just “disassembbling and re-assembling”. I’ve worked before with load cells, and they are “solid” devices, with soldered and glued connections in the cell end (no contacts to clean there).

So I looked at the mainboard end of the load cells wires, at the right back side of the board. While checking the connectors, I noticed that the wires from the three load cells (three groups of four wires each) run quite near the board components, even touching the board, and had ferrite beads around them to reduce electronic noise.

Load cells produce quite small voltage signals, so they are very sensitive to noise from board components. So I just pushed wires and beads some milimeters away from the board, checking they kept there after reassembling.

Now the scale works fine (I’m too lazy for further testing, maybe connecting an oscilloscope probe to load cells output while moving cables would confirm or discard this theory).

Hope this helps.

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Wow,

I’ll check that. And come back with the results!! Thanks!!!

da

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John MacKay sarà eternamente grato.
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