Description: Drum motor error DMOTRDYN signal does not go low within 2 s after DMOTONN signal goes low.
Causes: Defective harness between drum motor and engine PWB (YC11), or improper connector insertion. Defective drum motor drive transmission system. Defective drum motor. Defective engine PWB.
Remedy: Defective harness between drum motor and engine PWB (YC11), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness. Defective drum motor drive transmission system. Check if the gears rotate smoothly. If not, grease the bushings and gears. Check for broken gears and replace if any. Defective drum motor. Replace the drum motor. Defective engine PWB. Replace the engine PWB.
Code: 4000
Description: Polygon motor (laser scanner unit) error POLRDYN signal does not go low within 2 s after POLONN signal goes low.
Causes: Defective harness between polygon motor and main PWB (YC10), or improper connector insertion. Defective harness between main PWB (YC11) and engine PWB (YC12), or improper connector insertion. Defective laser scanner unit. Defective engine PWB. Defective main PWB.
Remedy: Defective harness between polygon motor and main PWB (YC10), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness. Defective harness between main PWB (YC11) and engine PWB (YC12), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness. Defective laser scanner unit. Replace the laser scanner unit. Defective engine PWB. Replace the engine PWB. Defective main PWB. Replace the main PWB.
Code: 4200
Description: Laser output (pin photo sensor) error The pin photo signal (PDN) is not output within a specified time after the polygon motor ready signal (POLRDYN) becomes ready (L level).
Causes: Defective harness between PD PWB (YC1) and main PWB (YC12), or improper connector insertion. Defective APC PWB. Defective PD PWB. Defective main PWB.
Remedy: Defective harness between PD PWB (YC1) and main PWB (YC12), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness. Defective APC PWB. Replace the laser scanner unit. Defective PD PWB. Replace the laser scanner unit. Defective main PWB. Replace the main PWB.
Code: 5100
Description: Short-circuited main charger output Five pages have been printed with the main charger output short-circuited.
Remedy: Drum unit installed incorrectly. Verify harness is not pinched in the drum unit. Engine PWB installed incorrectly. Verify harness is not pinched in the engine PWB. Defective engine PWB. Replace the engine PWB.
Code: 6000
Description: Broken fuser heater lamp wire The temperature does not reach 100°C/ 212°F after the fuser heater lamp has been turned on continuously for 30 s. 30/31 ppm printer (EUR/USA model): The temperature does not rise by 1°C/ 1.8°F after the fuser heater lamp has been turned on continuously for 5 s during printing. 35/37 and 45/47 ppm printers (EUR/USA model): Fuser thermistor M detection temperature does not rise by 1°C/1.8°F after the fuser heater lamp has been turned on continuously for 10 s during warm-up or at standby. Fuser thermistor S detection temperature does not rise by 1°C/1.8°F after the fuser heater lamp has been turned on continuously for 5 s during warm-up or at standby. The temperature does not rise by 1°C/ 1.8°F after the fuser heater lamp has been turned on continuously for 5 s during printing.
Causes: Poor contact in the fuser thermistor M connector terminals. Fuser thermistor M installed incorrectly. Thermal cutout triggered. Fuser heater lamp installed incorrectly. Broken fuser heater lamp wire.
Remedy: Poor contact in the fuser thermistor M connector terminals. Reinsert the connector. Fuser thermistor M installed incorrectly. Check and reinstall if necessary. Thermal cutout triggered. Check for continuity. If none, replace the thermal cutout. Fuser heater lamp installed incorrectly. Check and reinstall if necessary. Broken fuser heater lamp wire. Check for continuity. If none, replace the fuser heater lamp.
Code: 6020
Description: Abnormally high fuser thermistor M temperature 30/31 ppm printer (EUR/USA model): The temperature of the fuser thermistor M detects 250°C/482°F or more continuously for 3 s. 35/37 and 45/47 ppm printers (EUR/USA model): The temperature of the fuser thermistor M detects 240°C/464°F or more continuously for 3 s
Causes: Shorted fuser thermistor M. Defective engine PWB.
Remedy: Shorted fuser thermistor M. Measure the resistance. If it is 0 W, replace the fuser thermistor M. Defective engine PWB. Replace the engine PWB.