HP LaserJet Pro 400 Service Manual - Page 205

Table 2-8 Event-log-only messages (continued) Event code Description Solution 54.0600 54.1100 54.1101 54.1102 Density sensor error Black density out of range Cyan density out of range Magenta density out of range Verify that the cables between the DC controller and the ITB are firmly connected. If the error persists, replace the color misregistration sensor. If the error persists, replace the ITB. If the error persists, replace the DC controller. 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 54.1501 54.1502 Color plane registration sensor error (inline devices only) Cyan CPR pattern cannot be read Magenta CPR pattern cannot be read 1. Turn off the power by using the power switch, and then wait at least 30 seconds. 2. Turn on the power and wait for the product to initialize. If the error persists, verify that the cables between the color misregistration sensor and the DC controller are firmly connected. If the error persists, replace the color misregistration sensor. 54.1503 54.1599 Yellow CPR pattern cannot be read Black CPR pattern cannot be read If the error persists, replace the ITB. If the error persists, replace the toner cartridge tray. If the error persists, replace the DC controller. 54.2100 Beam detect (BD) error If the error persists, replace the DC controller. If the error persists, replace the product. 54.2500 Top-of-page sensor error Verify that the DC controller connectors are firmly connected. If the error persists, replace the DC controller. ENWW Troubleshooting tools 179