52 Chapter 2 Service tools EN
Cold Reset
Cold reset clears all data from the print buffer and returns the printing
menu and the configuration menu to the factory default settings.
To perform a cold reset
Select RESTORE FACTORY DEFAULTS from the Reset menu for the HP
LaserJet 4500 series
Select
RESTORE FACTORY SETTINGS from the Reset menu for the HP
LaserJet 4550 series
Service mode
Service mode allows for the modification of page counts and certain
registration values for the printer. In the LaserJet 4500 series, when the
configuration page is printed while in service mode, all event log
messages are printed as well. The LaserJet 4550 series event log can
be printed from the Information menu. If both the formatter and DC
controller are replaced at the same time, service mode will need to be
utilized to execute the color plane registration sequence to ensure
optimum print quality.
To access service mode
1 Hold down the CANCEL JOB key and SELECT key while turning the
printer on until the display is blank and the 3 LEDs are on.
2 Press the right side of the M
ENU key, and then press the SELECT
key.
Service mode will be displayed on the front panel briefly followed by
two rows of asterisks. The printer will go through its normal start up
cycle then display
SERVICE MODE on the front panel.
3 Press the MENU key to access the Service menu.
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