This article will guide you through the process of replacing the ribbon cable on the Onyx One, Onyx Pro and Mark Two printers. It is possible to damage the printer if you are not careful. There should be no excess force needed while opening up the printer and removing the cable.

Remove Ribbon Cable

1. Ensure that the printer is placed on a flat, stable surface that has enough room for you to move and flip the printer.

2. Completely unload print material. 

3. Power off and unplug the printer.

4. Remove and set aside the print bed and any fiber spools.

5. Disconnect the Wi-Fi antenna or Ethernet cable from the printer and set it aside.

6. Disconnect the feed tube from the plastic extruder. Remove it from the printer and set it aside.

7. Plug the drybox using the plug from the accessory kit. 

8. Move the print head to the back right corner of the printer.

   1. The nozzles may be hot.

9. Open the visor, then tape down the lid so it will not open. 

   
10. Close the visor and tape it so it will not open.  
    
11. Flip the printer upside down. 
    Note: Flip the printer over the back plate and onto the lid to avoid possible print head damage from sliding. Make sure not to rest the printer on the back plate, as this can cause damage to the ports on the back of the printer.   
    
12. Using the Phillips screwdriver, remove the ten screws from the bottom plate and set them aside.
    
13. Remove the bottom plate and set it aside.
14. Using the 2.5mm hex key, remove the four screws and the corresponding lock washers from the fan shroud and set them aside.
    
15. Remove the fan shroud and set it aside.  
    
16. Remove the fan screen (indicated below) and set it aside, making sure to note the orientation of the screen so that it can be reinstalled in the same way later. 
    Note: Clean the fan shroud and screen if necessary. 
    
17. Use the 2mm hex key to remove the eleven screws (circled below) from the back of the printer. 
    
18. Disconnect the ribbon cable from the motherboard by pinching the two sides of the cable connector to disengage the push tabs. Note that the cable is mounted beneath the board.
    Note: Carefully tuck the unattached ribbon cable underneath the motherboard to keep it from moving when flipping the printer. 
    
19. Carefully flip the printer right side up, making sure that the printer is not resting on the unattached ribbon cable.
    
    1. Flip the printer immediately right side up. Do not place the printer onto it's back, which could damage the ports.
20. Remove the tape and open the visor. 
21. On the print head, slide the cable clip (indicated below) away from the print head.  
    
22. Pinch the tabs on the ribbon cable connector to disconnect the ribbon cable from the print head.
23. Move the cable channel on the back wall of the printer down and away from the top of the printer to loosen it. 
     
    
24. Find where the ribbon cable adheres to the back wall, then carefully peel it off and slide it out of the cable channel. 
    
    1. Do not remove the adhesive from the printer, it will be needed when installing the new cable.
25. Close and reapply the tape to the lid and visor.
26. Flip the printer upside down. 
27. Carefully push the back plate away from the bottom plate to create a gap. Then slide the cable through until it reaches the opening previously covered by the fan shroud and screen.  
    
28. Remove the ribbon cable.

Install New Ribbon Cable

1. Flip the printer right side up. 
   
   1. Be careful not to allow the print head to slide when rotating the printer. It is recommended to flip the printer over it's backside onto it's base.
2. Retrieve the new ribbon cable and find the “OK” (indicated below) printed on it. The side with the “OK” will be connected to the motherboard and the blank side will be connected to the print head.  
   
3. Attach the new ribbon cable to the print head, then slide the plastic cable clip to the print head to secure it in place. 
4. Push the other end of the replacement ribbon cable through the opening previously covered by the fan shroud and screen. 
   
5. Carefully slide the cable between the cable channel and the back wall of the printer. 
   
6. Close and reapply the tape to the visor and lid. 
7. Flip the printer upside down. 
   
   1. Be careful not to allow the print head to slide when rotating the printer. It is recommended to flip the printer over it's backside onto the lid.
8. Slide the cable through the space between the back plate and the bottom plate of the printer to the opening previously covered by the fan shroud and screen.
   
9. Connect the cable to the port on the underside of the motherboard until you hear a click. Be sure the cable is fully seated in the motherboard before continuing.
10. Reinstall the fan screen, making sure to place it in its original orientation.
    
11. Put the fan shroud back in place and use the 2.5mm hex key to reinstall the four screws and corresponding lock washers.  
    
    
12. Place the bottom plate back onto the printer and use the Phillips screwdriver to reinstall the ten screws. 
    
13. Flip the printer right side up.
14. Remove the tape from the lid and visor. 
15. Open the visor. 
16. Align the ribbon cable beneath the cable channel and secure it using the adhesive left over from the old ribbon cable. 
17. Slide the cable channel up toward the top to get it back into position. 
18. Use the 2mm hex key to reinstall the eleven screws (indicated below) to the back of the printer. 
    
19. Reinstall the print bed.
20. Reinstall the Wi-Fi antenna or Ethernet cable.
21. Reconnect the plastic feed tube to the plastic extruder.
22. Remove the drybox plug, then reinstall the feed tube to the drybox. 
23. Plug your printer in and power it on.
24. Reload print material.
25. Level the print bed and run an Onyx Pillars Test Print.

For further technical support, please contact Hawk Ridge Systems at 877.266.4469 for the U.S. or 866.587.6803 for Canada and 3dpsupport@hawkridgesys.com.