Code :

Code: 921
Description: Fuser Error Indicates that the fuser is below proper temperature during standby or idle time.
Remedy: Fuser AC cables LVPS/HVPS Fuser If the fuser lamp comes on and a fuser failure light error code displays, be sure the thermistor is contacting the hot roll and the thermistor cable is firmly seated in connector J15 on the controller card. Check for excessive toner buildup on the surface of the thermistor. Clean as necessary. With the MFP unplugged, disconnect the thermistor cable from J15 on the controller card. Measure the resistance of the thermistor. The resistance measures from approximately 1K ohms immediately after printing or POR to approximately 240K ohms when thermistor reaches room temperature. (It may take 30 minutes to cool.) Replace the fuser assembly as necessary.

Code: 922
Description: Fuser Error Fuser failed to reach standby temperature.
Remedy: Lamp cable LVPS/HVPS Fuser Unplug the MFP and disconnect the fuser lamp cable plug from the LVPS/HVPS board connector CN102. Check for continuity across the fuser lamp by checking across the connector pins. • If there is continuity, go to Step 1: Continuity. • If there is no continuity, go to Step 2: No continuity. Step 1: Continuity Turn the MFP on with only the fuser power disconnected. Measure the voltage at connector CN102 on the LVPS/HVPS. It should match the line voltage. If line voltage is not present, see “LVPS/HVPS service check” for more information. Make sure the fuser thermistor is correctly connected to the controller board. If the problem persists, disconnect the thermistor cable at J15 and check for less than +5 V dc on pin 1. Pin 2 should be ground. If line voltage is incorrect on pin 1, see “Controller card service check” for more information. Step 2: No continuity Check the lamp cable for continuity. • If correct, replace the fuser. • If incorrect, replace the lamp cable. Disconnect the thermistor cable from J15 on the controller card. Measure the resistance across the ends of the thermistor cable. See “Controller card” for more information. Replace the fuser assembly if the resistance is lower than 1K ohm or shorted. Note: Resistance measures approximately 240K ohms when cool and 1.4K ohms hot.

Code: 923
Description: Fuser Error Fuser is too hot during printing or when MFP is idle.
Remedy: Lamp cable LVPS/HVPS Fuser Unplug the MFP and disconnect the fuser lamp cable plug from the LVPS/HVPS board connector CN102. Check for continuity across the fuser lamp by checking across the connector pins. • If there is continuity, go to Step 1: Continuity. • If there is no continuity, go to Step 2: No continuity. Step 1: Continuity Turn the MFP on with only the fuser power disconnected. Measure the voltage at connector CN102 on the LVPS/HVPS. It should match the line voltage. If line voltage is not present, see “LVPS/HVPS service check” for more information. Make sure the fuser thermistor is correctly connected to the controller board. If the problem persists, disconnect the thermistor cable at J15 and check for less than +5 V dc on pin 1. Pin 2 should be ground. If line voltage is incorrect on pin 1, see “Controller card service check” for more information. Step 2: No continuity Check the lamp cable for continuity. • If correct, replace the fuser. • If incorrect, replace the lamp cable. Disconnect the thermistor cable from J15 on the controller card. Measure the resistance across the ends of the thermistor cable. See “Controller card” for more information. Replace the fuser assembly if the resistance is lower than 1K ohm or shorted. Note: Resistance measures approximately 240K ohms when cool and 1.4K ohms hot.

Code: 924
Description: Fuser Error An open circuit has been detected in the fuser thermistor circuit.
Remedy: Lamp cable LVPS/HVPS Fuser Unplug the MFP and disconnect the fuser lamp cable plug from the LVPS/HVPS board connector CN102. Check for continuity across the fuser lamp by checking across the connector pins. • If there is continuity, go to Step 1: Continuity. • If there is no continuity, go to Step 2: No continuity. Step 1: Continuity Turn the MFP on with only the fuser power disconnected. Measure the voltage at connector CN102 on the LVPS/HVPS. It should match the line voltage. If line voltage is not present, see “LVPS/HVPS service check” for more information. Make sure the fuser thermistor is correctly connected to the controller board. If the problem persists, disconnect the thermistor cable at J15 and check for less than +5 V dc on pin 1. Pin 2 should be ground. If line voltage is incorrect on pin 1, see “Controller card service check” for more information. Step 2: No continuity Check the lamp cable for continuity. • If correct, replace the fuser. • If incorrect, replace the lamp cable. Disconnect the thermistor cable from J15 on the controller card. Measure the resistance across the ends of the thermistor cable. See “Controller card” for more information. Replace the fuser assembly if the resistance is lower than 1K ohm or shorted. Note: Resistance measures approximately 240K ohms when cool and 1.4K ohms hot.

Code: 929
Description: Toner Sensor
Remedy: The toner sensor is not operating properly, the developer drive assembly is not operating properly, or the toner cartridge is defective.
Toner sensor Controller card Try a different toner cartridge. If changing the toner cartridge doesn’t fix the problem, check pin 1 in J17 for +5V. Pin 3 is ground. If the voltage is present, replace the toner sensor. If the voltage on pin 1 is incorrect, replace the controller card.

Code: 931
Description: Printhead Error—no first hsync
Remedy: Check for unplugged printhead (J12 on the controller card), faulty cabling, or faulty printhead.

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