HP 8550mfp Service Manual - Page 384
FAN FAILURE, 1 ERROR, CYCLE POWER, Table 41., Numbered printer messages continued, Fan 3 FM 3
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Table 41. Numbered printer messages (continued) 57.3 FAN FAILURE Description: One of the cooling fans failed. 3 = Fan 3 (FM 3) 58.1 ERROR CYCLE POWER Description: Indicates that the paper diverter inside the right upper door is out of position, causing an error feeding media from tray 1. Event log message: 57.00.03 Action: Caution: Turn the printer off and do not operate the printer in this condition or it can be seriously damaged. 1 Turn the printer off and on to reset it. 2 Reconnect connectors J645 and J647 on the main relay PCA, J18 and J74 relay connectors, and connector J227 on the controller board. 3 Reconnect connector J641 on the main relay PCA, and connector J102 on the power supply. 4 Measure the voltage across J645-3 (FAN3ON) and J645-1 (GND) on the main relay PCA after the printer is turned on. If the voltage changes from 0 V to 24 V, replace fan 3. 5 Measure the voltage across connector J641-1 (+24 VB) and J641-4 (GND) on the main relay PCA after the printer is turned on. If the voltage is not 24 V, replace the main relay PCA. 6 Measure the voltage across connector J641-1 (-24 VB) and J641-4 (GND) on the main relay PCA after the printer is turned on. If the voltage is not 24 V, replace the main relay PCA. 7 Check the AC power supply. 8 If the problem is not rectified after the printer is turned off and on again, find the cause of activation of the overcurrent/overvoltage detection circuit in the power supply. Wait more than two minutes before turning the printer back on. 9 Replace the controller board. Event log message: 58.00.01 Action: 1 Open the right upper door and check for a media jam or misfed media. 2 Turn the printer off and on to reset the printer. 382 Chapter 7 - Troubleshooting EN