Checking the brush drive motor (Discovery 1)

1. Check the condition of the brushes. When the rubber blade of the brush wears out, the operating speed of the brushes may decrease and the current in the electric motor winding may increase. Check by replacing the brushes.

2. If the electric motor rotates at a low frequency or the current in its winding is higher than the permissible value, check the condition and adjustment of the lever mechanism.

3. Check the current in the winding with the brush drive levers disconnected.

Note:

• a) For the rear window electric motor, there is no need to disconnect the levers; wet the glass.
• b) Observe the polarity of the power supply connection. If the polarity is reversed, the motor will rotate in the opposite direction and the limit switch may be damaged.