• Code: 917.xx
• Description: Transfer service error
• Remedy: Replace the transfer roll. Transfer roll Check transfer roll area for debris, and clean as necessary. Verify continuity between the spring below the left side bearing and the transfer roll shaft. Verify continuity in the spring and the cable connection on the LVPS/HVPS. Inspect the roll for signs of wear or damage, and replace if 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: Replace the fuser. 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 J10 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: 927.00
• Description: Service fan error
• Remedy: Replace the fan. Cooling fan Make sure the fan cable plug is properly seated at J19 (controller card). Turn the MFP off, and disconnect the cooling fan cable from connector J9 on the controller card. Turn the MFP on. Within a few seconds, the controller card assembly should apply between +24 V dc to pin 2. See “Controller card” for more information. If voltage is present and the fan is not turning, replace the cooling fan. If the fan still doesn’t function, replace the controller card. Note: The fan speed is controlled by a module on the controller card. Between +8 V and +24 V dc are constantly supplied at pin 2 (J19). Pin 1 is ground while pin 3 receives feedback from the fan motor. If voltage is not present, see “Controller card” for more information.

• 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. Printhead Unplug the MFP. Disconnect the printhead cables from J13 and J12 on the controller card. Turn the MFP on. On the controller card, verify +24 V dc on pin 5 at J13 and +5 V dc on pin 7 at J12. Verify grounds on pin 4 at J13 and on pins 2, 6, and 8 at J12. • If voltages or grounds are incorrect, check the controller card. See “Controller card service check” for more information. • If voltages are correct, replace the printhead (cables are included).

• 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. Main motor cable LVPS/HVPS Controller card Verify +24 V dc at J19, pins 8 and 9, and +5 V dc at pin 6 (controller card). Verify ground at pins 4 and 5 for both the card and cable. • If these voltages are correct, check the main motor cable for continuity. - Remove rear cover to access connector on motor. - If continuity exists on each wire, call next level of service. - If continuity does not exist on one or more of the wires, replace the motor cable. • If these voltages are not correct, see the “LVPS/HVPS service check”, or replace the controller card. Note: The main motor is not a service part.

• Code: 940.00
• Description: LVPS service error
• Remedy: Replace the LVPS/HVPS. Fuser AC cables LVPS/HVPS Fuser 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: 948.xx, 949.xx
• Description: Failed controller board
• Remedy: Replace the controller board. Controller card assembly Verify +24 V dc input from the LVPS/HVPS. • Turn the MFP off. • Disconnect the LVPS/HVPS cable from the controller card at J22. See “Controller card” for more information. • Turn the MFP on. Verify +24 V dc from the cable connector of J22, pins 8 and 9. Verify that pins 7, 12, and 14 on both the cable and the card connectors are ground. • If voltage is correct, check the continuity in the cable. If the cable is good, see the “Controller card” for more information. • If grounds are not correct on the cable, first check it for continuity and then check the LVPS/HVPS. See “LVPS/HVPS service check” • If the grounds are not correct on the controller card, replace the controller card. (Check with one probe on the connector pin and the other on the ground plane of the card found at each screw head.) Note: With all cables connected, the MFP should complete POST within approximately 12–15 seconds in the following sequence: 1. The function and scan quality LEDs illuminate for one second and then flash three times. 2. Loading is displayed on the operator panel. 3. The CIS illuminates, and the scanner performs a calibration. 4. The drive motor runs. 5. The scanner CIS returns to the home position. 6. Error messages are displayed if applicable. 7. The MFP cycles down into standby mode/ready. Ready is displayed on the operator panel. If immediately following power-on, the operator panel lights are active but the MFP does not go through steps 1 and 2 above, replace the controller card assembly.

• Code: 950.xx
• Description: Mismatch between EEPROM and mirror memory Note: A new controller board or operator panel has been installed, and has not been properly prepared for this use. Install a new note. Do not install both the controller board and the operator panel at the same time without a POR in between.
• Remedy: Install a new controller bored or operator panel. See “Controller card service check” or “Operator panel service check”.
  Operator panel Controller card Buttons Check connector J4, pin 2 for 3.3 V. If the voltage is present, replace the operator panel. If the voltage is not present, replace the controller card. Perform the panel test and button tests found in diagnostics. See “Panel Test” and“Button Test”. If the tests fail, replace the operator panel. Lights If the lights don’t illuminate, make sure the cable is properly connected to the controller card and the operator panel. Ensure the controller card has input voltage to it. Verify +24 V dc on cable pins 8 and 9 at J22. • Check for +5 V dc at J4, pin 1. See “Controller card service check” or page 4 for more information. • If these voltages are not correct, replace the controller card. • If these voltages are correct, replace the operator panel. If more than one light does not turn on or an individual light stays on solid during POST, replace the operator panel. If all lights are dim and operate erratically during POST or all lights come on and stay on solid during POST, replace the FRUs in the following order one at a time: • Controller card • Operator panel