symptom

可以聽到motor運轉聲,但夾頭保持靜止、獨立暫停或空轉,喺任一完全選擇嘅速度範圍內無正常傳動。

可以聽到motor 運作,但夾頭保持靜止, 1. 放開扳機,拆除battery,喺檢查選擇器同夾頭之前停止使用驅動路徑。

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