HP LaserJet Enterprise M552 - ITB unit detection

ITB unit detection
The DC controller monitors several signals from the ITB unit to detect status.
ITB unit life detection The DC controller detects whether the ITB unit is new by monitoring the new ITB
unit sensor. The DC controller determines the ITB unit is at end of life and noties
the formatter when a specied number of pages are printed after the ITB unit is
replaced. If swapping ITB units between two printers for troubleshooting
purposes, be sure to return the ITB units to their original printers to maintain the
correct life count.
NOTE: When installing a new ITB, refer to the instructions for resetting the ITB
life counter in the installation guide provided with the replacement part.
ITB unit presence detection The DC controller detects the presence of an ITB unit by monitoring the primary-
transfer roller disengagement sensor. The DC controller turns on the primary-
transfer disengagement solenoid for specied times during an initial rotation
period when the following events occur:
●
The printer is turned on
●
The printer exits sleep mode
●
The door is closed
The DC controller determines the absences of an ITB unit and noties the
formatter when it does not detect a specied signal from the new primary-
transfer roller disengagement sensor.
ENWW Engine laser/scanner system 47