HP Color LaserJet CM4730 Service Manual - Page 549

Table 6-2 Control-panel messages (continued) Control panel message Description Recommended action 50.6: An open fuser error has occurred. 4. Check all cable connections to/from the DC controller. 50.7: A fuser pressure release mechanism failure has occurred. 5. Replace the low-voltage power supply PCB. 50.8: Low fuser sub-thermistor temperature 50.9: High fuser sub-thermistor temperature The error might be due to an inadequate power supply, inadequate line voltage, or a problem with the fuser. 51.1Y Printer Error A laser error has occurred. 1. Turn the MFP off and then on. 51.10 = Black 51.11 = Cyan 2. If possible, run the scanner test diagnostic for the laser scanner indicated. 51.12 = Magenta 51.13 =Yellow 3. Reseat the connectors (J1002 - Y, J1003 - C, J1004 - M, J1005 - K) between the laser/scanner and DC controller PCB. 4. Upgrade formatter and DC controller firmware, which can be found in a single .RFU file from http://www.hp.com/support/ ljcm4730mfp. 5. Replace the defective laser/scanner assembly. See Laser/scanner components on page 370. Calibrate the printer after replacing the laser/ scanner. 51.2Y Printer Error A laser beam error has occurred. 1. Turn the MFP off and then on. 51.20 = Black 51.21 = Cyan 2. If possible, run the scanner test diagnostic for the laser scanner indicated. 51.22 = Magenta 51.23 = Yellow 3. Upgrade formatter and DC controller firmware, which can be found in a single .RFU file from http://www.hp.com/support/ ljcm4730mfp. 4. Reseat the connectors (J1002 - Y, J1003 - C, J1004 - M, J1005 - K) between the laser/scanner and DC controller PCB. 5. Replace the defective laser/scanner assembly. See Laser/scanner components on page 370. Calibrate the printer after replacing the laser/ scanner. ENWW Control-panel messages 529