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Are your motors simply not moving?  Does your plot appear to have "stair steps" or jagged lines?  Are the stepper motors loud or whining?  Are they running so hot that you can't touch them?  You likely need to adjust the "Current Adjust" control on the EBB board with a small screwdriver.  This is a physical control -- a potentiometer -- on the EBB circuit board mounted to your Eggbot chassis.  The control is labelled "CUR ADJ" on the board.  If the current is too strong or too weak you may see (or hear) these symptoms.  The current increases as you rotate the control counter-clockwise (CCW).  Starting with the control turned all the way clockwise (CW), both motors should be very weak (note that not all potentiometers have a stop to indicate the end of the turning range, and some potentiometers adjust in the opposite direction).  With the Eggbot powered on and the motors engaged, as you increase the current -- turning the control with a small screw driver CCW -- you should be able to feel the motors increasingly resist moving by your hand. The ideal setting is one that provides smooth, relatively low-noise moves from the stepper motors, but has enough torque that the pen arm is not "floppy".  Often, this is about half way CCW, maybe a little less. More current, while increasing the motors torque, leads to jerky moves, with position errors (e.g., stair steps).
 
Are your motors simply not moving?  Does your plot appear to have "stair steps" or jagged lines?  Are the stepper motors loud or whining?  Are they running so hot that you can't touch them?  You likely need to adjust the "Current Adjust" control on the EBB board with a small screwdriver.  This is a physical control -- a potentiometer -- on the EBB circuit board mounted to your Eggbot chassis.  The control is labelled "CUR ADJ" on the board.  If the current is too strong or too weak you may see (or hear) these symptoms.  The current increases as you rotate the control counter-clockwise (CCW).  Starting with the control turned all the way clockwise (CW), both motors should be very weak (note that not all potentiometers have a stop to indicate the end of the turning range, and some potentiometers adjust in the opposite direction).  With the Eggbot powered on and the motors engaged, as you increase the current -- turning the control with a small screw driver CCW -- you should be able to feel the motors increasingly resist moving by your hand. The ideal setting is one that provides smooth, relatively low-noise moves from the stepper motors, but has enough torque that the pen arm is not "floppy".  Often, this is about half way CCW, maybe a little less. More current, while increasing the motors torque, leads to jerky moves, with position errors (e.g., stair steps).
  
If adjusting the current does not help, double check to make sure that all eight of the wires to the motor are firmly and correctly attached in the terminal blocks on the EBB.
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:NOTE: Some boards have a potentiometer that adjusts in the opposite direction. If your board is red AND the potentiometer is made of white plastic, start by turning it fully counter-clockwise and then turn clockwise until the motors provide moderate resistance.
 
 
:NOTE: Some boards have a potentiometer that adjusts in the opposite direction. Start by turning it fully counter-clockwise and then turn clockwise until the motors provide moderate resistance.
 
  
 
:NOTE: the stepper motors are the two large, metal encased motors which mount to the Eggbot's chassis.  One rotates the egg while the other rotates the proximal pen arm.  The smaller, plastic encased motor which raises and lowers the distal pen arm is a "servo motor".  Its behavior is '''not''' controlled by the current adjustment.
 
:NOTE: the stepper motors are the two large, metal encased motors which mount to the Eggbot's chassis.  One rotates the egg while the other rotates the proximal pen arm.  The smaller, plastic encased motor which raises and lowers the distal pen arm is a "servo motor".  Its behavior is '''not''' controlled by the current adjustment.

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