Why does the electric drill press the switch? Sometimes it turns, sometimes it doesn't turn. What's the reason?
1, the switch may be a problem, the 2 hand into the line of power cord broken, leading to poor contact, most of this problem. 3, flashlight carbon brush can be used for a long time, this problem is rare.
The switch or power line is out of order and the contact is bad.The brush has been used for a long time and needs to be replaced.
