Printing Height of Hotend

 

The Hotend Collides Into The Print Bed While Auto Leveling

                                     fig.1 - Checking Hotend End-Stop

                       
             fig.1 - Checking Hotend End-Stop



If the hotend end-stop works with the [M119] check but collides into the print bed while Auto Leveling without stopping, the end-stop screw may be screwed too far in.

Unscrew (fig.1) the screw slightly until a clicking sound can be heard at every light press with your index finger.


Never touch the hotend with unprotected skin while it is hot as it will result in burns!
Let the hotend cool down completely before proceeding to fix it.

 



The Hotend Jumps In The Air While Auto Leveling

The end-stop screw may be screwed too far out. Screw in the screw (fig.3) slightly until a clicking sound can be heard. It should also click at every light press with your index finger.

Never touch the hotend with unprotected skin while it is hot as it will result in burns!
Let the hotend cool down completely before proceeding to fix it.

 

 

Carriages Move In Opposite Direction

 
  fig.2 Stepper Motor Cable Plug Orientation


  fig.2 Stepper Motor Cable Plug Orientation


Ensure that the stepper motor cables are plugged into the control board in the correct orientation (fig.4).

Swap the DRV8825 driver chip of the corresponding problematic axis with another one that functions properly. If the problem carries over, then the DRV8825 chip needs to be replaced. Ensure that the DRV8825 chips are in the correct orientation.

 

 

Printer Doesn't Power On Or LCD Doesn't Work


Check if the printer is plugged in, and that the adapter LED status light is on. Ensure that the power terminals on the control board are all plugged in correctly (assembly manual pg.26, 28).

If the printer powers on but the LCD screen does not light up, ensure that the LCD cables are plugged into the board correctly and in the correct order. Turn off the printer and unplug power while plugging or re-plugging in the LCD ribbon cables.

Faulty DRV8825 driver chips may also be the cause of the printer not powering on.
Remove each chip successively and test the power on. If the LCD screen powers on with a certain DRV8825 chip removed, then that chip needs to be replaced.

 

Carriage Does Not Move Or Speed Is Different

Upon situations where all three axes should move at the same speed, such as the Auto Home or Auto Level command, and one axis moves at a different speed, do the following checks:

1.    Check if the motor cables are fully connected to the control board

2.    Check if the end-stop terminals are properly connected to the control board

3.    Shut down the printer and remove both the power and USB cables. Swap the corresponding DRV8825 driver              chip of the malfunctioning carriage with that of another properly working carriage. Run the Auto Home or Auto          Level command. If the other carriage becomes abnormal and the previously malfunctioning carriage moves                properly, then the DRV8825 chip is the source of the problem. Check to see if the voltage is set correctly (fig.3)        If voltage is correct and it is still problematic, then a replacement is needed.

 

The First Layer Prints At Different Heights Across Print Bed

If the first layer prints at different heights across the print bed surface it generally indicates that the G29 Auto Level procedure did not run properly. Since it probes an array of points across the print bed, an incorrectly probed point will cause problems when printing near that point. For example, if the effector jumped in the air on one of the points during auto level, then the hotend, when printing near that area, will move to the same point in the air where the effector jumped because it thinks the print bed surface is there.

1.   Ensure that the wire tube is long enough to allow the effector to touch the print bed without being taut or              having excess tension.

2.  Ensure the timing pulley and timing belts are properly assembled and not loose.

3.  Ensure the tip of the hotend is clean with no protruding material, as that will skew the Auto Level results.

4.  If the screw on the effector touching the end-stop is very loose from a larger screw hole on the effector, the hole      diameter can be slightly reduced by heating it with a lighter. Remove the surrounding components to prevent            them from being burned.

 

Measuring And Adjusting Voltage of A DRV8825 Chip

   fig .3 - Measuring Voltage of DRV8825 Driver Chip


   fig .3 - Measuring Voltage of DRV8825 Driver Chip

The DRV8825 driver chip (fig.1) is essential for controlling the stepper motors of each axis. The right voltage is also key to how accurately the stepper motors move. To measure the voltage of the DRV8825 driver chip:

1.   Have the printer powered on

2.   Set the multimeter to the two-digit voltage range

3.   Connect the positive (red) terminal of the multimeter to the metal Phillips screw head on the DRV8825 chip.

4.   Connect the negative (black) terminal of the multimeter to the negative power terminal on the control board             (one with a black wire)

To adjust the voltage, rotate the screw on the DRV8825 chip (fig.1) with a Phillips screw driver. The screw is extremely sensitive, so turn very slightly and check frequently. Set to 0.4V.



Side fans do not turn

 

1.  Check the connection of the "Quick Wire Connector;" make sure it's             making good contact with the conductor (the metal part of wire).

2.  The side fans will only activate once the printing height exceeds the            "Fan Z[mm]" in KISSlicer's Material column.
     If you want to check it manually, please choose  [Control > Temperature      > Fan Speed] on the LCD panel, and adjust the value to 255.