HP LaserJet Pro 400 MFP M425 - Manual (Page 171)

Recommended action
Load Tray 1 with plain paper in the size indicated, and then press the OK button.
Load tray <X> Press [OK] for available media
Description
The tray is empty.
Recommended action
Load paper into the tray to continue printing. Press the OK button to select a different tray.
Load tray <X> <TYPE> <SIZE>
Description
A tray is configured for the paper type and size that the print job is requesting, but that tray is empty.
Recommended action
Load the correct paper into the tray, or press the OK button to use paper in a different tray.
Manual Duplex Load Tray 1, Press OK
Description
The first side of a manual duplex job has printed, and the page needs to be loaded to process the second side.
Recommended action
Load the page in the indicated tray with the side to be printed face up, and the top of the page away from you
and then press the OK button.
Manual feed <SIZE> <TYPE>, Press OK to use available media
Description
The product is set for manual feed mode.
Recommended action
Press the OK button to clear the message or load the correct paper into Tray 1.
Memory is low. Press OK.
Description
The product memory is almost full.
Recommended action
Press the OK button to finish the job, or press the Cancel button to cancel the job.
Break the job into smaller jobs that contain fewer pages.
ENWW Interpret control panel messages 155