HP Color LaserJet 8550 Multifunction Printer series - Manual (Page 52)

52 Chapter 2 Basic copy module functions
EN
Turning the copy module off
Figure 12 System power button
To turn off power to the system (both the copy module and the printer
unit), press the power button located on the right side of the copy
module control panel. The green light located beneath the power
button will be off when the power button is turned off.
Below are some suggestions for determining when to turn the system
off:
! Turn off the system when not in use for a prolonged period of
time (for example, turn off the system overnight).
! After turning the system on, the touch panel display should
appear before turning the system off again.