HP 8550mfp Service Manual - Page 381

Table 41. Numbered printer messages (continued) 54.4 WASTE TONER SENSOR ERROR CYCLE POWER Event log message: 54.00.04 Description: The waste toner sensor has failed. Printing cannot continue. Action: 1 Replace the waste toner sensor assembly. 2 Replace the imaging drum. 54.00.05 (event log message) Sensor abnormality. See CLEAN DENSITY SENSOR CYCLE POWER in table 42 on page 389. 54.00.06 (event log message) Out of range cyan. See CLEAN DENSITY SENSOR CYCLE POWER in table 42 on page 389. 54.00.07 (event log message) Out of range magenta. See CLEAN DENSITY SENSOR CYCLE POWER in table 42 on page 389. 54.00.08 (event log message) Out of range yellow. See CLEAN DENSITY SENSOR CYCLE POWER in table 42 on page 389. 54.00.09 (event log message) Out of range black. See CLEAN DENSITY SENSOR CYCLE POWER in table 42 on page 389. 55 PRINTER ERROR CYCLE POWER Event log message: 55.00.01 Description: Indicates a printer command error. The commands cannot be exchanged between the printer and its controller. Action: 1 Turn the printer off and on to reset the printer. 2 Verify the controller board is fully seated. 56.1 ERROR CYCLE POWER Event log message: 56.01.01 Description: Indicates an input feed error (such as requesting to feed transparencies through the duplexer), or that the input tray is not installed. Action: 1 If the input tray you are trying to print from is not installed, install the input tray. 2 Turn the printer off and on to reset the printer. 56.2 ERROR CYCLE POWER Event log message: 56.00.02 Description: Indicates an illegal output error. For example, the multi-bin mailbox is not installed and it was selected as the output destination, or there are transparencies in the duplexer. Action: 1 Open the printer and remove media from the paper path. 2 Verify that the media type is set in the printer control panel. 3 Turn the printer off and on to reset the printer. EN Printer message troubleshooting 379