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Today morning it was replaced with BC817-25. Found the analogue browsing 6bw56. Now fans are working as well as the printer itself 🙂 Thanks for the detailed scheme!

Hi, have almost the same issue. In fact, there is +20V on the fans wiring coming. But when I connect 2 fans in series the voltage is dropping down until +2V. I suppose the problem is in the transistor, but not sure. A bit of prehistory. I bought this UM2+ on ebay for repair. Fans were not working. I've tested them and found that one of them is broken. Ordered 12V fan from aliexpress. After conecting new fan in series they started rotating. I was happy 🙂 But after a while - nothing is working again. Separately fans are rotating (I was checking with 12 and 24 volts batteries). But in the printer - they are not. Voltage is dropping down extremely. Maybe the reason is displayed at the attached picture 🙂 Anybody knows the type of this transistor?