Electronics > Repair
Ankarsrum AKM6230 1500W repair
Marek85:
I bought a broken Anakrsrum mixer and I wanted to repair it for my wife but I'm stuck. It seems like the motor controller is damaged. I can't find the board on ebay and the only place that offers these boards is a finnish site which will sell this part only to finnish service shops :(
https://www.huoltopalvelu.com/epages/huoltopalvelu.sf/en_GB/?ObjectPath=/Shops/Huolto/Products/600000018-52
I would be great if anyone would help me to get this board...
As for troubleshooting I can't find any schematics for this board. I made pcbRtg file for this site https://thmq.mysteria.cz/pcbRtg/ If someone wanted to take a look and could help me to reverse enginner it.
1. Switching the mixer ON does nothing. No noises, movements, nothing at all. The PCB and inside of the mixer looks pretty clean no burn marks or cracks.
2. The PCB board is supplied by AC and ATtiny861 on the board is supplied with +5V. But I dont know how to diagnose if it's alive or not.
3. I noticed that the R24 is shorted (no burn marks) and from the color code it should be 27.9 Ohm. Replacing it didnt help.
4. The motor is controlled by BTB16-600BW triac. I dont see any DIAC but I assume that pulses are generated by ATtiny. The motor is fine I checked it with a cheap AC motor controller like this one: https://www.amazon.com/Controller-Electric-Voltage-Regulator-Adjustable/dp/B07GFKMGXR
5. There is a speed sensor that might be damaged aswell. I think it sends the speed signal as a feedback to the PCB. The controller will push more current through the triac when the load increases to maitain stable rpm. But I think even without this sensor the motor should start at least?
Thank you for any help.
Marek85:
Pretty weird +5 V power supply for ATtiny microcontroller using TL431. But it seem to work just fine.
If someone knows this type of voltage regulator or materials where I could read more about it and learn how it works would be great.
Anyways this seems to be OK in the controller board of the mixer.
Swake:
This is a capacitive power supply. Not very efficient, but negligible compared to the motor and this device is not switched on all the time anyhow.
Are you sure the triac is still ok?
If that big resistor was the gate resistor then I think that gate is gone.
Swake:
This guy explains pretty well how to simply test a triac with a multimeter.
Swake:
Source of the board in Norway. Don't know if they'll sell something to you or not.
https://reservedele.nu/produkter/dele-til-smaaapparater/roeremaskiner/ankarsrum-assistent-dele-og-tilbehoer/print-til-ankarsrum-akm6230-akm6290b~40392
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