Variobot varikabi Manual page 88

Fault Diagnosis
Problem
varikabi does not move at all.
Only one of the motors is running.
A motor turns backwards.
Possible Reasons
• The left and right sensors are connected with the
wrong polarity.
• A battery cable is not inserted correctly in the
breadboard or the battery clip is not on the 9V
battery.
• The battery is empty or defective.
• The rubber caps are too far on the motor shafts.
• The left or the right sensor is connected to the
breadboard with the wrong polarity.
• A transistor is connected to the breadboard with
the wrong polarity.
• A connection cable of the motor is not inserted
correctly in the breadboard.
• A rubber cap is pushed too far on the motor shaft.
• This motor is connected with the wrong polarity.