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Another excellent write-up by @EcoDrift (via Google Translate) regarding all the QC issue of recent Ninebot One Z manufacturing (including references to our very own North American superdealer @Jason McNeil ) https://ecodrift.ru/2019/02/12/ninebot-z10-chastaya-polomka/ Ninebot Z10. One of the frequent breakdowns. I tried to collect material on the pre-sale preparation and maintenance of the monowheels. But my attention was attracted by the open Ninebot Z10. He asked what happened to him, but it turned out that this is a sad whole story, which I will tell you today. After the start of sales, Ninebot Z-series monowheels unexpectedly turned out to be leaders in the number of warranty calls. Wheels directly out of the box often do not turn on, as the battery protection works. Our very first wheel didn’t turn on that way. But I came across a wheel with another problem. It clearly looks like a Facebook user (click). The wheel walks back and forth and does not really hold the horizon. I just caught the wheel disassembled: The following problem is visible on the controller: Contacts burned at current sensors: What have two. These current sensors are Hall effect and they are designed for a very high current. Such sensors (designed for high current) were detected only in Ninebot (in Gotway, sensors are connected via current-lowering resistors and have much more modest parameters). Service engineers immediately said that this is a frequent problem of the Z-series. And for example, dragged another Z10, whose contact burned down only on one sensor: You can see that the sensor on the left side feels fine: The guys from the service center tried to restore the burnt track on this wheel. After that, the wheel goes normally, but if it is on it try to drive into a small curb from the spot and everything repeats. The problem can be anywhere, but the simplest thing is to just take a new controller. Rather, the board with the power part: To check how much this “repair” really helps, I decided to check with our American colleague Jason McNeil. He is the owner of the portal eWheels.com and has sold quite a lot of Z-series monowheels. Jason confirmed that it is enough to replace one lower board and the problem does not recur. The same sensors on the new board: The reverse side of the new board (the controller is diluted on an aluminum substrate): So the repair is very simple. Disconnect all wires. Remove the fee: Thermal grease on the old board: We connect new, we connect everything back: And the wheel works great: But I decided to ask Jason about the situation with the Z-series: how often they break and how many of them have a marriage. Jason was very emotional, because from Z10 he decently boiling. Jason wants to sue Ninebot for non-compliance with its obligations and for the poor quality of the Z-series. Marriage was abound. As a percentage, this is at least 20% of all devices sold. The problem of current sensors can lead to melted wires of the phases and even burnout of the controller. And of course, enough battery problems. As a result, Jason's opinion about the Z-series in particular, and Ninebot in general, is just a piece of garbage. Sheer frustration. For the comfort of users, it remains only to add that the overwhelming majority of problems arise at the start of operation. Approximately the first 50km and a pair of first charge cycles. If the wheel has passed the initial stage, the probability decreases to very low.