HP 8550mfp Service Manual - Page 401

Table 42. Unnumbered printer messages (continued) INCORRECT FUSER LOWER LEFT DOOR Event log message: 50.00.05 Description: The printer has detected that an incompatible fuser (possibly the wrong voltage of fuser for the printer) has been installed. Action: 1 Remove the fuser and install the fuser specified for use with this printer. Printing cannot continue until the correct fuser is installed in the printer. For information about ordering a fuser kit, see page 511. 2 Reconnect connector J222 on the controller board and connector J26 on the fuser. 3 Replace the controller board. INPUT DEVICE PAPER PATH OPEN Event log message: None Description: The VTU on the 2,000-sheet input unit is open. Action: Close the VTU. INSTALL Event log message: None Description: The toner cartridge is not installed, not correctly installed in the printer, or not being detected by the cartridge sensor. Action: 1 Insert the cartridge or make sure the installed cartridge is correctly seated in the printer. = Cyan, magenta, yellow, or black Note: The color toner carousel will not rotate unless the following conditions are met: Caution: Use the blue button to rotate the carousel to prevent damage to the printer. • The blue toner lever is locked. • The clear door is closed. • The imaging drum is installed. • The black toner cartridge is installed completely, including removing the orange seal from the black toner cartridge and swinging the upper (blue) lever to the left. • The right upper door is closed. 2 Turn the printer off and on to reset the printer. 3 If the cartridge is installed correctly, check that the sensor PS1901C is functioning properly. 4 Clean the sensor with a toner wipe. 5 Reconnect connector J221 on the controller board, and connector J621 and relay connector J70 on the remaining color toner sensor. EN Printer message troubleshooting 399