L7780 false carriage jam message

[John_Teufel]

After a recent paper jam on the print cartridge side of my printer when the paper curled upward, I get a continuous "Carriage jam" error even though the carriage moves freely. The carriage does not move back to the left side on it's own when I hold down the "OK" button but I can move it manually. I can see nothing amiss although I suspect a micro switch or contacts may be causing the problem. I tried all the HP steps including a power reset. Everything is fine momentarily  then  the carriage jam message comes on. At one point I got a print head cover error but it cleared after I reinstalled the print heads. Baffled! Any help or suggestions appreciated.

[A4Apollo]

Hi! @John_Teufel, Welcome to HP forums.

I understand that you get carriage jam error on your printer even though the carriage moves freely.

Don't worry I'll try to help you out.

Did you make any changes on your printer or PC previously?

Please try the steps recommended below.

Try performing a partial reset on your printer and check if it helps.

Use the following steps to reset the product.
Press the Power button () to turn on the product.
Disconnect the power cord from the back of the product.
Wait 20 seconds.
Press and hold # and 3 on the product control panel.
While holding down these buttons, reconnect the power cord to the back of the product.
After the product turns on, release both buttons. The product resets to the factory defaults.
Try to print a self-test report. See the steps on how to print a self-test report at the top of this document.
If these steps resolved the issue and the test page prints, there is no need to continue troubleshooting. Reconnect the USB cable, and then try to print again.
If the test page prints successfully, but you experience a different issue with your printer, go to HP Product Support Home Page, and then search for another document that relates to the issue you are experiencing.
 NOTE:
If the page displays in the wrong region or language, click the Region - Language link in the upper right corner of your browser. Then you can select the correct region and language.

Refer this article to further troubleshoot carriage jam issues.

Let me know if this works!

Have a great day ahead! 🙂