Error code 0x6100004 (but no paper jam found) and the printer carriage is stuck to the right

[Baltus55]

My 6978 OfficeJet Printer has stopped working with an error code 0x6100004 message. The printer carriage is stuck to the right. Using HP videos and other support resources, I did an extensive check for a paper jam and found none. The HP Scan Doctor produced a "Printer Failure" message and directed me to check that the paper tray and other components were properly seated and doors were closed (which I did), along with checking for a paper jam. I also confirmed that the firmware, drivers and other software were all up-to-date. I was unable to remove three of the four ink cartridges, because the carriage is stuck so far to the right, but I visually confirmed that none of the cartridges were protruding or otherwise improperly inserted. I was unsuccessful in my attempt to print a stand-alone copy, and (with the power cord disconnected) I was unable to slide the printer carriage to the left. After leaving the power cord disconnected overnight, I reconnected it and observed that the printer carriage was able to traverse the entire length of the track before returning to its position on the right. I reviewed an HP Carriage Jam video without finding any methods of solving my situation. I also uninstalled and re-installed the software for the 6978. None of my ink cartridges are empty (per the HP Smart software indicator), and each slot has a cartridge loaded. The printer is used infrequently and the unit is kept clean. 

[Echo_Lake]

@Baltus55

Thank you for posting on HP Support Community.
 

Don't worry as I'll be glad to help, I appreciate your efforts to try and resolve the issue. 

This seems like a hardware issue with the printer. I have a few troubleshooting steps we could try to fix the issue:  

Perform a power reset:

1. Turn on the printer, if it is not already on.
2. Wait until the printer is idle and silent before you continue.
3. With the printer turned on, disconnect the power cord from the rear of the printer.
4. Wait at least 30 seconds.
5. Plug back the power cable straight to a wall outlet and printer without any surge protector.
6. Turn on the printer.

Update the printer firmware:

Here are the steps:- Click here

You can refer to this HP document for more assistance:- Click here
 

Hope this helps! Keep me posted for further assistance.
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!