症状
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Trigger binds, fails to return, changes speed erratically, or does not stop the drive.
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battery无法完全滑入工具，无法卡入或保持锁定，释放异常。
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Independent checks show the battery charges and powers a tool normally, but the red or yellow indicator is too dim to read, remains stuck, stays on after pack removal, or does not match the label pattern.
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Charging begins but never reaches full, or the pack remains unusable.
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无 LED 或 motor 响应
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鞋无法旋转或滑动，深度杆或斜切旋钮无法锁定，或操作或切割时设定发生偏移。
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The motor runs normally, but the LED is dead, dim, or intermittent with trigger use.
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方向选择器动作并保持正常卡位，但卡盘无法在某一方向运行或反向旋转。
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A suitable bag or vacuum collects little dust while the port remains secure and aimed.
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The forward/reverse lever binds, commands the wrong direction, or center lock fails.
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The torque ring binds, will not hold a setting, or slips at clearly wrong torque.
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Tool rotates, but a seated fastener gets little torque or no normal impact pulse.
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Smoke, flame, arcing, liquid, damaged cord, battery damage, or exposed structure is present.
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LED工作灯不亮或异常持续点亮
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The full-indicating pack runs a task far less than a healthy pack.
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With a secure known-good blade clear of the work, the saw has harsh sound, bind, or vibration.
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Power drops in normal handling while the pack shifts or feels loose.
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Tool or battery becomes abnormally hot, smells hot, or repeats heat shutdown after light use.
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Bit jams or drill stalls
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拆下battery且夹头为空时，转动套筒会自由旋转主轴和motor，而不是提供足够的锁定力以手动紧固或松开夹头。
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