• Code: 917.00
• Description: Problem with transfer— transfer servo start error. • Check HVPS • Check system board • Check HVPS/input sensor/toner sensor cable.
• Remedy: 1 Transfer roll assembly Check the transfer roll for toner buildup, surface damage to the roll, oil, or other contaminants on the surface of the roll. Replace the transfer roll as necessary. 2 Left transfer arm assembly Check the left transfer roll arm assembly to make sure it is fastened and locked in the down position. If the arm is not locked down, make sure the arm is not broken and locks into the EP frame correctly. Check the left transfer arm assembly spring for proper operation. 3 Right transfer arm assembly Check the right transfer arm assembly to make sure it is fastened and locked in the down position. If the arm is not locked down, make sure the arm is not broken and locks into the EP frame correctly. Check the right transfer arm assembly spring for proper operation. For any background problems, ensure the contact to the HVPS board is correct and that there is approximately 0 ohms resistance between the transfer roll shaft and the HVPS contact. If correct, go to “Print quality—background” 4 HVPS—917 Error code Check the voltage at J15-3. The voltage changes from +24 V dc with the printer idle to 0 V dc when the printer runs the print test. If the voltage is incorrect, check the continuity of line J15-3 in the front cable harness to the HVPS. If there is no continuity, replace the cable harness. If there is continuity, replace the HVPS. If the problem continues, replace the system board.

• Code: 920.01...920.97
• Description: Hot roll took too long to heat up. • Bad thermistor, circuit, or cabling. • Very noisy thermistor signal. • Fuser not receiving AC power. • Poor supply line voltage. • Low voltage or incorrect lamp. • Incorrect hot roll.
• Remedy: 1 Fuser lamp Fuser lamp AC cable Observe the lamp through the left near side of the printer. It may be necessary to remove the redrive assembly to observe the lamp turning on and off. If the lamp does not come on do the following: • If not previously removed, remove the redrive assembly. See “Redrive assembly removal”. • Remove the fuser assembly. See “Fuser assembly removal”. • Make sure the correct type of lamp is installed (voltage and wattage). • Verify that the fuser to fuser lamp cable is installed correctly to the fuser top cover assembly. If incorrect, install correctly; if correct, go to step 2. 2 AC line voltage CAUTION: When taking measurements for AC power, observe all safety precautions. Check the AC line voltage to make sure it is within operating specification. If incorrect, inform the customer; if correct, go to step 3. 3 LVPS CAUTION: When taking measurements for AC power, observe all safety precautions. Unplug the AC line cord from the printer and pull the LVPS out far enough to access CN1 on the LVPS board (see “Low voltage power supply removal”). Disconnect the LVPS to fuser AC cable, plug in the line cord, turn the printer on and measure the voltage between CN1-1 and CN1-3 on the connector (see the connector locations at “Low voltage power supply”). If incorrect, replace the LVPS assembly (see “Low voltage power supply removal”); if correct, go to step 4. 4 Fuser lamp Fuser top cover assembly Fuser connect cable (fuser to fuser lamp cable) Check continuity of the fuser to fuser AC cable, fuser top cover assembly, and fuser lamp by checking the continuity between the two pins on the fuser lamp AC cable connector: • If there is continuity, go to step 5. • If there is no continuity, check the continuity of the fuser to fuser lamp AC cable. If incorrect, replace the lamp, if incorrect, replace the fuser top cover assembly. Note: If the fuser lamp is replaced, allow the fuser assembly to cool or a 925.xx error may be displayed. 5 LVPS LVPS to fuser AC cable CAUTION: When taking measurements for AC power, observe all safety precautions. Check the AC line voltage between the pins on the fuser end of the LPVS to fuser AC cable. If the voltage is correct, unplug the AC power cord from the LVPS cable. If the voltage is correct, unplug the AC power cord from the LVPS, pull the LVPS out far enough to be able to check the voltage between CN-1 and CN1-3 on the LVPS board. Plug in the power cord, turn the printer on and check the voltage. If correct, replace the LVPS to fuser AC cable; if incorrect, replace the LVPS assembly. Note: If the fuses in the LVPS are blown, the LVPS assembly must be replaced. 6 Fuser top cover assembly (thermistor, thermistor cable) Fuser to system board DC cable Check to make sure that the thermistor is installed correctly to J5 on the fuser control card. If installed correctly check the cable for any signs of damage. If any problems are found, replace the fuser top cover assembly. If no problem is found, check the fuser to system board DC cable for correct installation at J1 on the fuser control card. If no problem is found, check the fuser to system board cable for correct installation at J10 on the system board. 7 Error code 920.06 displayed LVPS System board System board to LVPS cable Carefully check the installation of the LVPS to system board cable to J27 on the system board and to CN2 on the LVPS. If the cable is not seated or installed properly, reseat the cable and retry the printer. If the cable is installed correctly, replace the following FRUs in the order shown: • LVPS assembly. See “Low voltage power supply removal”. • System board assembly. See “System board and inner shield removal —models X644e/X646e”. • LVPS to system board cable. 8 Fuser assembly If no problem is found up to this point, then replace the following in the order shown: • Fuser assembly. See “Fuser assembly removal”. • System board assembly. See “System board and inner shield removal —models X644e/X646e”. • LVPS. See “Low voltage power supply removal”.

• Code: 922.02...922.97
• Description: Hot roll took too long to reach the beginning lamp detection temperature. • Low wattage or incorrect lamp. • Bad thermistor, circuit, or cabling. • Fuser not receiving sufficient AC power. • Poor supply line voltage.
• Remedy: 1 Fuser lamp Remove the fuser assembly and check to make sure the correct fuser lamp has been installed. If the correct lamp has been installed, go to step 2. Note: If the fuser lamp is replaced, allow the fuser assembly to cool or a 925.xx error code could be displayed. 2 AC line voltage CAUTION: When taking measurements for AC power, observe all safety precautions. Check the AC line voltage to make sure it is within operating specification. If incorrect, inform the customer; if correct, go to step 3. 3 LVPS CAUTION: When taking measurements for AC power, observe all safety precautions. Unplug the AC line cord from the printer and pull the LVPS out far enough to access CN1 on the LVPS board (see “Low voltage power supply removal”). Disconnect the LVPS to fuser AC cable, plug in the line cord, turn the printer on and measure the voltage between CN1-1 and CN1-3 on the connector (see the connector locations at “Low voltage power supply”). If incorrect, replace the LVPS assembly (see “Low voltage power supply removal”); if correct, go to step 4. 4 LVPS LVPS fuser AC cable CAUTION: When taking measurements for AC power, observe all safety precautions. Disconnect the AC line cord from the printer. Disconnect the LVPS to fuser cable from the fuser to fuser lamp cable. Plug the AC line cord into the printer and check the AC line voltage between the pins on the fuser end of the LVPS to fuser AC cable. If the voltage is correct, unplug the AC power cord from the LVPS cable and pull the LVPS out far enough to be able to check the voltage between CN-1 and CN-3 on the LVPS board. Plug in the power cord, turn the printer on and check the voltage. If correct, replace the LVPS to fuser AC cable; if incorrect, replace the LVPS assembly. See “Low voltage power supply removal”. Note: If the fuses in the LVPS are blown, the LVPS assembly must be replaced. 5 Fuser top cover assembly (thermistor, thermistor cable) Fuser to system board DC cable Check to make sure that the thermistor is installed correctly to J5 on the fuser control card. If installed correctly check the cable for any signs of damage. If any problems are found, replace the fuser top cover assembly.“Fuser narrow media sensor removal”. If no problem is found, check the fuser to system board DC cable for correct installation at J1 on the fuser control card. If no problem is found, check the fuser to system board cable for correct installation at J10 on the system board. If no problem is found, go to step 6. 6 Fuser assembly If no problem is found up to this point, then replace the following in the order shown: • Fuser assembly. See “Fuser assembly removal”. • System board assembly. See “System board and inner shield removal —models X644e/X646e”. • LVPS. See “Low voltage power supply removal”.

• Code: 923.01...923.91
• Description: Fuser over temperature. • Short in the thermistor circuit. • Noisy thermistor signal • Fuser is actually overheating due to hardware faults.
• Remedy: 1 Fuser assembly Check for any signs of overheating in the fuser assembly. Check the hot roll, hot roll bearings, and the area around the thermistor for any signs of excessive heat. If a problem is found, replace the thermistor. If no problem is found, go to step 2. 2 Fuser top cover assembly (thermistor) Turn the printer off and disconnect the fuser to system board cable from J10 on the system board. Check the resistance between pins J10-3 and J10-4. The resistance should be greater than 100K ohms. If correct, go to step 3; if incorrect, disconnect the thermistor cable from J5 on the fuser board and measure the resistance between the two pins on the thermistor cable. If incorrect, replace the fuser top cover assembly (see “Fuser narrow media sensor removal”); if correct, replace the fuser to system board cable. 3 System board Fuser top cover assembly Check the voltage on J10-3 ground on the system board. The voltage should measure approximately +3.3 V dc. If the voltage is correct, replace the fuser top cover assembly. See “Fuser narrow media sensor removal”. If incorrect, replace the system board. See “System board and inner shield removal —models X644e/X646e”.

• Code: 924.01...924.91
• Description: Open thermistor check failure. • Noisy thermistor signal. • Intermittent connection. • Thermistor cable not connected or thermistor actually open.
• Remedy: 1 Fuser assembly Fuser to system board cable Check the thermistor cable for correct installation to J5 on the fuser card. If installed correctly, check for correct installation of J10 on the system board. If all cables are installed correctly, go to step 2. 2 Fuser top cover assembly (thermistor/thermistor cable assembly) Turn the printer off and disconnect the thermistor cable from J5 on the fuser board. Measure the resistance between the two pins on the thermistor cable, if the resistance measures infinity (open circuit), replace the fuser top cover assembly. 3 Fuser to system board cable. System board Fuser assembly Reconnect the thermistor cable to J5 on the fuser board. Disconnect the fuser to system board cable from J10 on the system board and measure the resistance between J10-3 and J10-4 on the cable. If the resistance measures infinity (open circuit) check the continuity of pins 3 and 4 of the cable. If correct, replace the fuser assembly. See “Fuser assembly removal”. If incorrect, replace the fuser to system board cable. Note: If the error code still displays, replace the system board. See “System board and inner shield removal —models X644e/ X646e”.

• Code: 925.01...925.92
• Description: Lamp detection performed and found error. • 115 V lamp in 220 V printer. • Lamp has excessive wattage.
• Remedy: 1 Fuser lamp If the fuser is 220 V machine a 115 V fuser may be installed. If the printer is not a 115 V model, then go to step 2. If the printer is a 220 V model, then check to make sure that the correct lamp is installed. Note: If the fuser lamp is replaced, allow the fuser to cool or a 925.xx error could be displayed. 2 AC power source Check the AC power source to make sure it meets specifications. If the AC power source does not meet specifications, inform the customer. If it meets specifications, go to step 3. 3 Fuser lamp Turn the printer off and allow the fuser assembly to cool. After the fuser assembly cools down, turn the printer on. If you receive the same error code, replace the fuser lamp. See “Fuser lamp removal”. Note: If the fuser lamp is replaced, allow the fuser to cool or a 925.xx error could be displayed.

• Code: 927.00...927.07
• Description: • Loose connector. • External blockage of the fan, preventing it from turning. • Bad fan. 927 .00 Service fan error. 927 .01 Main fan stalled. 927 .03 Main fan took too long to ramp up. 927 .04 Main fan underspeed or stalled during speed adjustment state. 927 .05 Main fan overspeed during speed adjustment state. 927 .06 Main fan capture data is invalid and speed control is at maximum in fan control idle state. 927 .07 Main fan capture data is invalid and speed control is at maximum in fan control adjustment state.
• Remedy: 1 Main fan Check the main fan to make sure it is plugged into J4 on the system board. If the fan cable id correctly connected to J4, check the cable and the cable connector for any signs of damage. If damaged, replace the main fan assembly. See “Main fan removal”. If undamaged, go to step 2. 2 Main fan Turn the printer off and check the main fan for any signs of blockage of the fan blades. If there is any sign of blockage, remove the blockage. 3 Main fan blades turn during POR, then stop. Fan will not run when trying to print. Main fan System board Measure the voltage at J4-1 on the system board. The voltage should measure approximately +2.5 V dc. If incorrect, replace the main fan. See “Main fan removal”. If that does not fix the problem, replace the system board. See “System board and inner shield removal —models X644e/ X646e”. 4 Main fan blades do not turn Measure the voltage at J4-3. The voltage should measure +14.4 V dc with the fan running full and approximately 7.0 V dc when running half speed. If incorrect, replace the main fan. See “Main fan removal”. If this does not fix the problem, replace the system board. See “System board and inner shield removal — models X644e/X646e”.

• Code: 927.02
• Description: Cartridge fan stalled. • Loose connector. • External blockage of the fan, preventing it from turning. • Bad fan.
• Remedy: 1 Cartridge fan Check to make sure the cartridge is plugged into J5 on the system board. If properly plugged in, go to step 2. 2 Cartridge fan Check for any signs of blockage in the fan. If any is found, remove and retry the printer. If no problem is found, go to step 3. 3 Cartridge fan System board Replace the following FRUs in the order shown: • Cartridge fan • System board. See “System board and inner shield removal —models X644e/X646e”.