• Code: 910.xx...914.01
• Description: 910.xx DC pick motor stall 911.xx DC pick motor excessive PWM 912.xx DC pick motor below speed 913.xx DC pick motor over speed 914.00 DC pick motor error 914.01 Lost encoder feedback
• Remedy:

• Code: 917.xx
• Description: Transfer service error
• Remedy: Replace the transfer roll.
  Note: Do not touch the transfer roll except at its ends. Place a sheet of paper over the roll to prevent damage from finger oils or hand lotion. Check the springs in the left and right transfer roll bearings. Do not try to move the left spring. The bearing assemblies should support the transfer roll, applying evenly distributed forces to the PC drum. Replace the transfer roll assembly if the springs or bearings show signs of damage or fatigue. Inspect the transfer roll for signs of wear, damage,. or contamination. Replace as necessary.

• Code: 920.00...925.xx
• Description: 920.00 Under temperature during steady state control. 921.00 Under temperature during standby control. 922.00 Fuser failed to ramp to target temperature 923.00 Fuser is over temperature. 924.00 Open thermistor check. 925.xx Wrong fuser installed. The fuser type stored in the cartridge ID does not match the actual fuser installed in the printer.
• Remedy: When toner is partially fused to the media, it is usually caused by low fuser temperature. The line voltage to the printer must be within the following limits: • 100 V ac-127 V ac for the 110 V model printer • 200 V ac-240 V ac for the 220 V model printer This printer uses a belt fuser and therefore does not have a lamp.
  Fuser power cable LVPS/HVPS Fuser Unplug the printer, and disconnect the fuser cable plug from the LVPS/HVPS board connector at CN102. Check for continuity across the fuser by checking across the connector pins. • If there is continuity, then check the LVPS/HVPS. See “LVPS/HVPS service check”. • If there is no continuity, then disconnect the fuser power cable at both ends and check each conductor for continuity. Replace cable if necessary. • If the cable tests good, then replace the fuser. Reconnect the cables, turn the printer on, and at &12, check for approximately +5 V dc on pin 1 and ground on pin 2. If line voltage is incorrect on pin 1, then see “Controller board service check” for more information. Fuser Disconnect the thermistor cable from J11 on the controller board. Measure the resistance across the ends of the thermistor cable. Replace the fuser assembly if the resistance is lower than 1K ohm or shorted. Note: Resistance measures approximately 400K ohms when cool and 1K ohms hot.

• Code: 927.00
• Description: Service fan error
• Remedy: Replace the fan
  Make sure the fan cable plug is properly seated at J13 (controller board). Turn the printer on. Within a few seconds, the controller board assembly should apply +24 V dc to pin 2. •If voltage is not present, then check or replace the controller board. See “Controller board removal”. •If voltage is present, then check pin 1 for 24 V dc as well. If it is close to 24 V dc while the fan is still idle, then replace the fan. See “Fan removal”.

• Code: 929.00...929.03
• Description: 929.00 Toner sensor error 929.01 No home window 929.02 No sensor transition (closed) 929.03 No sensor transition (open)
• Remedy: Remove the toner cartridge, and shake it Try a different toner cartridge, if possible. If the error persists, then replace the toner level sensor. See “Toner level sensor removal”.

• Code: 930.xx...935.xx
• Description: 930.xx Wrong printhead installed 931.xx No first hsync 932.xx Lost hsyncs 933.xx Mirror motor locked: No hsync received 935.xx Motor unable to reach operating speed
• Remedy: Replace the printhead.
  Note: New printhead must be aligned. See “Printhead assembly electronic adjustment”. Turn the printer off. Disconnect the printhead cables from J12 and J8 on the controller board. Turn the printer on with the front door closed. On the controller board, verify +5 V dc on pin 10 at J12 and +5 V dc on pins 1, 2, and 3 at J8. Verify grounds on pins 2, 4, and 7 at J12 and on pin 4 at J8. •If voltages or grounds are incorrect, then check the controller board. See “Controller board service check” for more information. •If voltages are correct, then replace the printhead (comes with cables).

• Code: 936.xx...937.00
• Description: 936.xx Transport motor initial lock failure 937.00 Main transport motor lost lock
• Remedy: Replace the main motor gear drive.
  Warning: Do not replace the operator panel and controller board at the same time. Each card contains the printer settings. When either of these cards is new, it obtains the settings from the other card. Settings are lost when both are new and replaced at the same time. Turn off the printer, and unplug the main motor cable at J19. Turn on the printer, and check for the following voltages at J19: Verify ground at pin 5 for both the card and cable. •If these voltages are correct, then check the main motor cable for continuity. - Remove the left side cover to access the connector on the motor. - If continuity exists on each wire, then replace the main motor gear drive which includes the motor. - If continuity does not exist on one or more of the wires, then call the next level of support. •If these voltages are not correct, then see “Controller board connector pin values”, or replace the controller board. See “Controller board removal”.

• Code: 940.00
• Description: LVPS service error
• Remedy: Replace the LVPS/HVPS.
  LVPS portion of board Fuses that open typically indicate a faulty LVPS/HVPS. Disconnect the power cable, and open the LVPS/HVPS enough to test the switch. The switch will show continuity across the conductors with a meter when the switch is on. If the switch is good, then see “Dead machine service check” for more diagnostics. HVPS portion of board Problems with the HVPS are exhibited in the print quality. See “Networking service check” for more information.