HP LaserJet Pro 400 Printer M401 series - Manual (Page 107)

To avoid this problem, try the following solutions:
◦ Adjust the paper guides in the tray. Make sure the front paper guide is pushing the paper against
the back edge of the tray.
◦ Use paper that meets HP specifications. Store paper unopened in its original packaging.
◦ Use the product in an area that meets the environmental specifications for this product.
Print failure, press OK. If error repeats, turn off then on.
Description
The product cannot process the page.
Recommended action
Press the OK button to continue printing the job, but output might be affected.
If the error persists, turn the power off and then on. Resend the print job.
Rear door open
Description
The product rear door is open.
Recommended action
Close the door.
Remove shipping material from toner cartridge
Description
A toner cartridge shipping lock is installed.
Recommended action
Pull the orange tab to remove the shipping lock from the cartridge.
Replace black cartridge
Description
The toner cartridge is at the end of its useful like, and the product is customer-configured to stop printing
when it reaches the very low state.
Recommended action
To ensure optimal print quality, HP recommends replacing the toner cartridge at this point. You can
continue printing until you notice a decrease in print quality. Actual cartridge life may vary. Once an
HP toner cartridge has reached very low, HP's Premium Protection Warranty on that toner cartridge has
ended. All print defects or cartridge failures incurred when an HP toner cartridge is used in continue at
ENWW Interpret control panel messages 95