HP LaserJet 9000 Printer series - Manual (Page 14)

Chapter 1 Printer basics 14
Layout and basic operation of the control panel
Interpreting control panel lights
Light Indication
Ready
Off The printer is offline or has an error.
On The printer is ready to print.
Blinking The printer is going offline; please wait.
Data
Off The printer has no data to print.
On The printer has data to print, but is not ready or is
offline.
Blinking The printer is processing or is printing the data.
Attention
Off The printer has no error.
On The printer has a critical error. Turn the printer off
and then on.
Blinking Action is required. See the control panel display.