Displaying 077-901 paper jam. How do I repair?

Hi! open the right door and clean the jam detection sensors ( there is 2 or 3 ).

Steps To Fix HP Printer is Displaying A 50.4 Error Message

1. First thing you have to do is to cancel all the pending printing jobs in the queue.
2. Now switch-off your printer and leave it for few seconds to cool it down.
3. After cooling down the printer completely, the fuser failure error appears on the display screen.

https://www.hpprintersupportpro.com/blog/hp-printer-is-displaying-a-50-4-error-message/


https://www.laserprinterservices.com/hperrorcodes.html
HP Printer Error Codes HP Laser Printer Error Code 13.4 paper jam 50.1 Bad Low Voltage Power Supply 13.5 Paper jam in the fuser 50.2 Fuser Error 13.6 Paper jam in the fuser 50.5 Fuser Error 13.20 jam in the paper feed drive 50.9 Fuser Error

If you cannot find any paper but the printer is still displaying a jam, then it is most likely a paper late jam check the pick-up roller and if it is smooth, time to replace it. Other wise, you will need a tech to clean out the paper path and make sure there are no scraps.

There are other sensors to check or verify that there is continuity in the wires of the sensor that you've removed

good luck

There is pieces of paper stock on the sensor, when the paper jam happen after pulling out the paper did you get the whole page of paper of the paper have missing pieces? open the paper guide, turn off and on the printer and observe the unusual objects in the roller, this error is caused by objects in the sensor.

mine does too! help

When a paper jam occurs during printing for some reason, the printer beeps, displaying the message <PAPER JAM> in the display. When a paper jam occurs, remove the jammed paper using the following procedure, and then resume the job. If the message that indicates the paper jam does not disappear even after removing the jammed paper following the procedure, there is a possibility that torn pieces of paper are still left inside the printer. Inspect each part of the printer again, and completely remove all pieces of jammed paper.

replace or repair pick up rollers....

Check to see if something isn't blocking the paper path.

You could try cleaning the feed rollers as well.

I work in a shop repairing these printers and have had a large number with the same fault - displaying E-3 with no jam in the paper path. This is caused by a broken part in the paper feed mechanism that pevents the printer from taking the paper. The part located right at the bottom of the printer looks like two white gears connected together with a central spring. At present I am trying to find a supplier of the spare parts - will check back.