Rep: 37
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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?
Ist dies eine gute Frage?
Rep: 247
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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!!!
This worked great for me!
Ángel gave me the track with his technical description to isolate the problem.
I didn't want to disassembly the machine, so I thought that maybe if I could move the wires shaking the machine, it would work.
I tried shaking it upside down, didn't work. I tried shaking it in lateral movements, didn't work.
Then I shake the machine vertically, in its normal position from up to down, and I hit softly the base of the machine against my knee at the end of the movement from up to down while I was sat (not hitting the rubber feet, just in the space among them).
It worked!, the scales began to measure with 0,00 g. of error.
It clearly seems that the TM5 has a design problem, and the wires goes too close to some components that produce electric noise, altering the measuring signal.
Vorwerk should fix this design problem transparently instead of request the customers to send the machine to the technical service and return it without an explanation of the fail.
Many thanks Ángel!
Glad to help :-)
Just read this thread and took Sergio’s advice which fixed a scale that was going 0 - Max. Thanks Angel for the original inspiration and Sergio for trialling the quick fix.
Sergios method just worked for me too!! And I have been trying to fix this for ages. Please try it!! Had to try twice - second round of banging worked.
Rep: 73
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Hello.
First of all I would like thanks to Angel for his technical explanation.
I finally solved the problem opening the machine front panel and sticking the wires to the plastic of the case (behind of the electrical board).
Here you have a picture of the wires after I put some black adhesive band in order to stick them to the Thermomix case.
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We did this and want to thank you for the photo, it was very helpful and our scales now work : ) thanks so much
I did exactly like you did and the scale is now back to life again! THANK YOU!!
Rep: 49
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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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Thank you for the info! I found there is a spike of plastic at the bottom toward the rear that the wires should probably be hooked over, so I pulled the board out an inch or so and moved the wires over it. Mine also has the wires cable tied to the board, the ferrites were touching the board so I flicked them to the outside. Cleaned and reassemble and working great. U also found a great step through to disassemble:
Rep: 13
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After reading the very insightful and helpful explanation of Angel, I managed to repair the scale by following the TM5 disassembly guide and by doing just like Joshiro did. It worked for me!
Moreover, I want to confirm the explanation of Angel with the photo of how I found the load cells wiring right after opening the TM5.
One of the ferrite beads was touching another ferrite component from the motherboard, thus polluting the signal coming from the load cells. I separated the three beads from the motherboard as Joshiro suggested and the scale came back to life again. Surely a design flaw from Thermomix, despite the price...
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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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9 Kommentare
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.
von Sergio Dámaso Juan
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.
von kai.bosch
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)
von Norbi
I have same problem.. the measure is not correct. have advise to fix it up?
von Omar Ugoletti
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.
von Norbi
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