Description: Broken fuser thermistor M wire 30/31 ppm printer (EUR/USA model): Input from fuser thermistor M is less than 1 (A/D value) for more than 1 s. 35/37 and 45/47 ppm printers (EUR/USA model): Input from fuser thermistor M is less than 1 (A/D value) for more than 3 s.
Causes: Poor contact in the fuser thermistor M connector terminals. Broken fuser thermistor M wire. Fuser thermistor M installed incorrectly. Thermal cutout triggered. Fuser heater lamp installed incorrectly. Broken fuser heater lamp wire.p
Remedy: Poor contact in the fuser thermistor M connector terminals. Reinsert the connector. Broken fuser thermistor M wire. Measure the resistance. If it is ∞, replace the fuser thermistor M. 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: 6120
Description: Abnormally high fuser thermistor S temperature *35/37 and 45/47 ppm printers (EUR/ USA model) only The temperature of the fuser thermistor S detects 250°C/482°F or more continuously for 3 s
Causes: Shorted fuser thermistor S. Defective engine PWB.
Remedy: Shorted fuser thermistor S. Measure the resistance. If it is 0Ω , replace the fuser thermistor S. Defective engine PWB. Replace the engine PWB.
Code: 6130
Description: Broken fuser thermistor S wire *35/37 and 45/47 ppm printers (EUR/ USA model) only Input from fuser thermistor S is less than 1 (A/D value) for more than 1 s.
Causes: Poor contact in the fuser thermistor S connector terminals. Broken fuser thermistor S wire. Fuser thermistor S installed incorrectly.
Remedy: Poor contact in the fuser thermistor S connector terminals. Reinsert the connector. Broken fuser thermistor S wire. Measure the resistance. If it is ∞, replace the fuser thermistor S. Fuser thermistor S installed incorrectly. Check and reinstall if necessary.
Code: 6400
Description: Zero cross signal error The ZCROSS signal does not reach the engine PWB for more than 2 s.
Causes: Defective harness between connect-L PWB (YC8) and engine PWB (YC3), or improper connector insertion. Defective connection between power source unit (YC103) and connect- L PWB (YC1) Defective power source unit. Defective engine PWB.
Remedy: Defective harness between connect-L PWB (YC8) and engine PWB (YC3), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness. Defective connection between power source unit (YC103) and connect- L PWB (YC1). Reinsert the connector. Defective power source unit. Replace the power source unit. Defective engine PWB. Replace the engine PWB.
Code: 7000
Description: Toner motor lock error A motor over-current signal is detected continuously for 5 seconds since the toner motor is activated.
Remedy: Lump of toner inside toner container. Replace the toner container. Defective toner replenishment drive system. Replace the developer unit. Defective toner motor. Replace the developer unit. Defective engine PWB. Replace the engine PWB.
Code: 7410
Description: Drum unit non- installing error The drum unit is not installed or not installed properly. The drum PWB EEPROM does not communicate normally.
Causes: The drum unit is not installed. Defective connection drum PWB (YC1) and connect- L PWB (YC3). Defective drum PWB EEPROM. Defective engine PWB.
Remedy: The drum unit is not installed. Install the drum unit. Defective connection drum PWB (YC1) and connect- L PWB (YC3). Check the connection of connectors drum PWB (YC1) and connect-L PWB (YC3). Defective drum PWB EEPROM. Replace the drum unit. Defective engine PWB. Replace the engine PWB.