HP LaserJet Pro 400 color Printer M451 series - Manual (Page 167)

Misprint Press [OK]
Description
Paper has been delayed as it moves through the product.
Recommended action
Press the OK button to clear the message.
To avoid this problem, try the following solutions:
1. Adjust the paper guides in the tray. Make sure the front paper guide is pushing the paper against
the back edge of the tray.
2. Use paper that meets HP specifications. Store paper unopened in its original packaging.
3. 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 lock from <color> cartridge
Description
A print cartridge shipping lock is installed.
Recommended action
Pull the orange tab to remove the shipping lock from the cartridge.
Remove shipping locks from cartridges
Description
A print cartridge shipping lock is installed on one or more print cartridges.
ENWW Interpret control panel messages 149