DeWalt DW248 Product Manual page 3

Explanantion of the "Anti-lock" control system
This drill has an electronic feature called "Anti-lock control". It is designed to help control
the drill during a stall / lock up situation and prevent the tool from pulling out of your hands.
This stall condition usually occurs when the drill bit binds in the hole of the material and
may be encountered when using large bits in steel or wood.
The way the system works is that when the electronic circuit senses a stall condition, it
signals the motor to cycle on and off for a set period of time. This takes up some of the
reaction of the stall and will help you keep the drill under control.
Since some reaction will occur, always use the side handle and be prepared for a
potential stall. The electronic circuit then checks to see if a stall condition still exists and
if it does, it will shut off the tool in approximately one half of a second. Releasing and
reactivating the switch will start the tool up again. If it does not see a stall, the drill will
continue to function as normal.
The unit has an indicator light and label located in the top of the tool. There are three
signals the light gives off:
1) Check: One flash each time the trigger is depressed means the electronic circuit is
functioning correctly. If there is no flash, then the tool is not working correctly and
should be repaired.
2) Engaged: Should a stall condition exist, the electronic circuit will shut down power
to the tool and the light will be steady on. When the unit is running in normal mode,
there will be no light indication.
3) Problem: A series of continual flashes as the trigger is depressed indicates that the
electronic circuit is no longer functioning. The tool may still be able to function without the
benefit of the Anti-lock control but should be serviced as soon as possible.
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