症状
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The attached cord or plug is cut, frayed, crushed, loose, discolored, scorched, or abnormally hot. There is no current smoke, spark, flame, melting charger housing, or liquid ingress.
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能听到motor声音，但夹头保持静止或仅间歇转动。
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The collar pulls, but the bit will not come out, or a short/broken piece is recessed in the chuck.
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Motor sound is present, but the anvil and installed bit remain stationary.
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The bit passed initial insertion, but backs out, falls free, or loses drive while the chuck body stays secure.
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With the battery removed, the clutch collar is physically stuck, cracked, excessively loose, or unable to align a numbered setting or drill mode with the index mark.
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After a normal full charge, the battery delivers usable power but substantially less work than a comparable known-good pack in the same tool, task and conditions.
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Trigger speed changes
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The drill works at no load but stalls, slows severely, or stops during drilling or driving.
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Metal chips, grinding dust, steel wool, foil, or another dry conductive buildup is visible in the battery cavity, around contacts, or at ventilation slots. No liquid or active smoke, spark, burning, or melting is present.
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The bit rotates, but a real fastening load never produces the normal impact sound or pulses.
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A straight bit traces a visible circle at no load instead of rotating on a stable centerline.
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Liquid has entered the charger or battery interface, or the charger shows smoke, sparks, burning odor, charring, melting, or active electrical arcing.
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电源断断续续或减弱，出现异常motor噪音，或brush火花过多。
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The collar moves and holds a low numbered setting, but the clutch does not ratchet before a test fastener is overdriven in suitable scrap material.
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After a normal full charge, the battery loses a large amount of indicated charge or usable low-load runtime while stored by itself in a cool, dry place.
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Clutch ratchets on a low setting
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Round bit will not grip
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The collar moves normally, but the clutch ratchets before a suitable fastener reaches normal depth at appropriate settings, or it audibly slips when drill mode is correctly selected.
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The front work light stays dark during trigger use or remains on abnormally afterward.
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