• Code: 54.2
• Display: 54.2 PRINTER ERROR
• Description: Indicates that a problem exists with the carousel assembly. Either the carousel is not rotating or the sensor has failed. Drive motor (M3) provides drive for the toner cartridge carousel. If motion is not detected, a 54.2 error appears. M3 is a 6-phase stepping motor and receives its drive signal from J203 of the developing PCB. Photosensor PS10 monitors “movement” (and the position) of the toner cartidge carousel. Different width tabs (four tabs, one for each cartridge) on the left-end of the carousel housing pass through PS10 to provide positioning information. The black toner cartridge tab is the home position. Toner cartridge position within the carousel is monitored by PS11. If PS11 fails or is improperly connected, a 54.2 error appears. Another indicator of this is that the carousel starts to rotate then stops immediately. A 54.2 error message can also occur if the sensor is installed backwards.
• Remedy: 1. Turn the printer off and then on to reset the printer. 2. Open the color toner door and look for an obstruction. If necessary, remove the toner cartridges individually by manually releasing the carousel brake and rotating the carousel around to each cartidge position and removing the cartridges. Turn the printer off and on to reset the printer. Note The printer CANNOT operate with the top cover removed unless the carousel brake has been released or removed. 3. Verify the carousel drive motor wiring harness is firmly seated into connector J203 of the developing PCB (see Figure 7-38). 4. Verify PS10 (refer to Figure 7-31) is working correctly and not excessively dirty (clean if necessary) and that the wiring harness is firmly seated into both the sensor assembly and connector J206 of the developing PCB. 5. Verify PS11 is connected and functioning properly. 6. Verify all connectors to the developing PCB and the DC controller PCB are firmly seated. 7. Verify that the rotary drive assembly is working. Replace it on older units with more than 50K of life.

• Code: 54.3
• Display: 54.3 PRINTER ERROR
• Description: The printer is not receiving data back from the density sensor (PS14). PS14 is located in the bottom of the imaging drum drawer (refer to Figure 7-30). During calibration routines, a series of images are written on the imaging drum and the densitometer measures the density of the image (e.g. amount of toner that is placed into the drum). These measurements provide the feedback to ensure image quality is consistent throughout the life of the consumable.
• Remedy: 1. Verify the densitometer is clean; perform the toner density sensor cleaning procedure in Chapter 7 of the online user guide. 2. Inspect the density sensor wiring harness for damage. The harness runs from the density sensor through the left-side upper control arm of the imaging drum drawer to J1010 of the DC controller PCB. Verify that the cable is firmly seated into the J1010 of the DC controller PCB. 3. If the error persists, replace the density sensor assembly.

• Code: 54.4
• Display: 54.4 PRINTER ERROR
• Description: Optional equipment is not recognized.
• Remedy: Turn the printer off and on to reset the printer.

• Code: 54.5
• Display: 54.5 PRINTER ERROR
• Description: Indicates a waste toner sensor malfunction.
• Remedy: 1. Turn the printer off and on to reset the printer. 2. Remove the drum cartridge and clean the waste toner detection window with a dry cloth. 3. Clean the waste toner sensor unit at the printer side with a dry cloth. 4. Check the light guide and clean it if necessary. Replace the light guide if the ends are scarred. 5. Reconnect the waste toner sensor unit connector and the DC controller PCB connector (J1009) correctly. 6. Replace the waste toner sensor (PS13).

• Code: 54.6
• Display: 54.6 PRINTER ERROR
• Description: The OHT sensor has reported an error condition. This can be caused by contamination in the connectors, a blocked sensor, or a defective sensor.
• Remedy: 1. Remove the ITB and verify that the OHT sensor prism is in place. 2. Lift the registration flap and verify that the OHT sensor is not blocked. 3. Remove the ITB drawer and inspect the drawer connectors for contamination such as a piece of paper. 4. If the error persists, verify that all connectors are firmly seated. 5. Replace ITB drawer.

• Code: 55
• Display: 55 DC CONTROLLER ERROR
• Description: The print engine is not communicating with the formatter. The communication link between the formatter and DC controller was lost. This can occur due to a timing error or intermittent connection between the formatter and DC controller
• Remedy: 1. Turn the printer off and on to reset the printer. 2. Reseat the connectors between the formatter and DC controller. 3. Only if the error persists, replace the DC controller making sure to perform the calibration and color plane alignment procedures.

• Code: 57.1
• Display: 57.1 FAN FAILURE
• Description: The printer detected that the fan (an exhaust fan located in the upper, left rear corner of the printer, refer to Figure 7-34) was not rotating. This fan operates off +24Vdc and is enabled by the DC controller PCB’s microprocessor.
• Remedy: 1. Turn the printer off and on to reset the printer. Visually check to see if the fan is rotating (if you cannot see any rotation, place your hand over the outlet vents to see if exhaust air is moving). 2. Remove the printer’s left-side cover. Check to see if anything is preventing the fan from rotating freely. 3. Verify that the fan’s connector is firmly seated into connector J208 of the developing PCB. 4. If the error persists, replace the fan.

• Code: 57.2
• Display: 57.2 FAN FAILURE
• Description: The printer detected that the fan (an exhaust fan located in the upper, right rear corner of the printer, refer to Figure 7-34) was not rotating. This fan, operates off +24Vdc and is enabled by the DC controller PCB’s micro-processor.
• Remedy: 1. Turn the printer off and on to reset the printer. Visually check to see if the fan is rotating (if you cannot see any rotation, place your hand over the outlet vents to see if exhaust air is moving). 2. Remove the printer’s left-side cover. Check to see if anything is preventing the fan from rotating freely. 3. Verify that the fan’s connector is firmly seated into connector J208 of the developing PCB. 4. If the error persists, replace fan.