HP LaserJet Pro 400 Service Manual - Page 203

Table 2-7 Event-log messages (continued) Event code Description 51.2300 Yellow scanner laser error (inline devices only) 54.0100 Environmental sensor error 54.0600 Density sensor error 54.1100 Black density out of range 54.1101 Cyan density out of range 54.1102 Magenta density out of range 54.1103 Yellow density out of range 54.1200 Black density measurement abnormality 54.1201 Cyan density measurement abnormality 54.1202 Magenta density measurement abnormality 54.1203 Yellow density measurement abnormality 54.1400 Color plane registration sensor error (inline devices only) 54.1599 Black CPR pattern cannot be read 54.1501 Cyan CPR pattern cannot be read 54.1502 Magenta CPR pattern cannot be read 54.1503 Yellow CPR pattern cannot be read 54.1500 Yellow toner level sensor error 54.1600 Magenta toner level sensor error 54.1700 Cyan toner level sensor error 54.1800 Black toner level sensor error 54.1900 Bad top-of-page (TOP) sensor 54.2100 Beam detect (BD) error 54.2500 Top-of-page sensor error 55.0000 Engine internal communication error 55.0601 DC controller NVRAM data error 55.0602 DC controller NVRAM access error 55.1000 DC controller memory error 57.0100 Fan motor error 57.0200 Fan error 59.0160 ITB or main motor rotation error (59.A0) 59.0192 Developer motor rotation error (59.C0) 59.0240 Transfer alienation failure (59.F0) ENWW Troubleshooting tools 177