HP 8550mfp Service Manual - Page 377
LASER ERROR, CYCLE POWER, SCANNER ERROR, Table 41., Numbered printer messages continued
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Table 41. Numbered printer messages (continued) 51 LASER ERROR CYCLE POWER Description: Indicates that a laser malfunction has occurred. 52 SCANNER ERROR CYCLE POWER Description: Indicates that the scanner motor is not turning properly. Event log message: 51.00.01 Action: 1 Turn the printer off and on to reset the printer. 2 Reconnect connector J1001 on the laser driver PCA and connector J205 on the controller board. 3 Reconnect connector J2 on the beam detect PCA, relay connector J40, and connector J211 on the controller board. 4 If the problem persists, replace the laser/ scanner unit. 5 If, after replacing the laser/scanner unit, the problem persists, replace the controller board. Event log message: 52.00.00 Action: 1 Turn the printer off and on to reset the printer. 2 Reconnect connector J901 on the scanner motor PCA, relay connector J40, and connector J211 on the controller board. 3 Measure the voltage across connector J647B11 (+24UH) and J647-4 (GND) on the main relay PCA after the printer is turned on. If the voltage is not 24 V, replace the power supply. 4 Measure the voltage across connector J211-7 (SCND) and J211-6 (GND) on the controller board after the printer is turned on. If the voltage changes from 0 V to 17 V or more, replace the laser/scanner unit. 5 Replace the laser/scanner unit. 6 Replace the controller board. EN Printer message troubleshooting 375