HP 8550mfp Service Manual - Page 391

Table 42. Unnumbered printer messages (continued) CLEAN DENSITY SENSOR CYCLE POWER Event log message: 54.00.0 = Description: 5 = Sensor abnormality 6 = Out of range cyan 7 = Out of range magenta 8 = Out of range yellow 9 = Out of range black Description: The process marks in the density sensing pattern are corrupted (see chapter 5 for more information). Action: 1 Press GO. 2 Print a configuration page and troubleshoot as an image-quality problem. 3 Check the transfer guide for cracks and replace the transfer guide as needed. CLEAR DUPLEX JAM LOWER LEFT DOOR Event log message: 13.00.0 = Description: 7 = Two-sided turnaround paper late jam 8 = Two-sided turnaround paper stopped jam 9 = Two-sided path paper late jam Description: The printer senses a media jam in the duplexer. Action: 1 Open the left lower cover, remove the duplexer, remove the jammed media, reinstall the duplexer, and close the left lower cover. 2 The fusing assembly and diverter assemblies can also cause duplex printing problems. Verify their operation. 3 Open the left lower cover and defeat the delivery cover interlock. Toggle the sensors at the paper exit and entrance. While running the sensor monitor test from the Service Mode Menu, verify sensors that 8 and 9 on the printer control panel indicate 1 (on) when toggled. Note: This procedure will not work if the left lower cover interlock is not defeated. 4 Replace the duplexer. EN Printer message troubleshooting 389