You might need a pen light to observe the flags. Verify the duplex-release sensor flag moves freely. Open the rear duplex jamrelease door and clear any visible paper. Make sure that the paper meets specifications.

Description: This error occurs if the duplex reverse photosensor (PS918) or fusing exit sensor (PS915) detect unexpected paper.

Make sure that the connector at J203 and J206 on the engine controller PCA are seated. Open the straight-through output door and verify that PS915 moves freely. Make sure sensors PS913 and PS912 move freely. Remove any paper or paper fragments present. Open the top cover and remove the print cartridge. If paper arrives at these sensors too early, leaves the sensors too late, or is present at the sensor when not expected, an error message is displayed.

Description: Photosensors PS913 (media width sensor), PS912 (top of page sensor) and PS915 (fusing assembly exit sensor) detect paper in the cartridge area of the product.

Make sure that the engine controller PCA is correctly installed. If the messages persists, install another HP print cartridge. Inspect the high-voltage contact on the print cartridge and in the printcartridge cavity to make sure that they are not damaged. Verify that the print cartridge is correctly installed.

Make sure that the sealing tape on the print cartridge has been removed. This message appears if the print cartridge's antenna is unable to detect the high-voltage bias. At start up or when the top cover is closed, a high-voltage bias is placed on the print cartridge's developer roller.

Description: The product checks for the presence of a print cartridge at start up and anytime the top cover is closed.

Make sure that the two connectors from the engine control PCA to the switch are securely installed on the switch contacts. Determine if SW301 closes when the door closes. Remove the left cover, and then open and close the cartridge door.

Description: Opening the cartridge door opens the cartridge door switch (SW301) and disables the +24 V to the high-voltage contacts on the print cartridges.

Hp laserjet p2055dn printer duplex