Remedy: Replace the LSU. Replace the LSU. Replace the main PCB and check for correct operation. Replace the engine PCB and check for correct operation.
Code: C6000
Description: Broken fixing heater wire • In fixing warm-up, the time to reach 50C/122F exceeds 13.5 s, the time to reach 100C/212F exceeds 10 s, the time to reach the primary stabilization exceeds 10 s or the time to reach the secondary stabilization exceeds 24 s.
Causes: Poor contact in the thermistor connector terminals. Fixing thermistor installed incorrectly. Fixing thermostat triggered.
Remedy: Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Check and reinstall if necessary. Check for continuity. If none, replace the fixing thermostat. Check and reinstall if necessary. Check for continuity. If none, replace the fixing heater M or S.
Code: C6020
Description: Abnormally high fixing unit thermistor temperature • The fixing temperature exceeds 230C/446F for 40 ms.
Causes: Shorted thermistor. Broken heater control circuit on the power supply PCB.
Remedy: Measure the resistance. If it is 0 Ω, replace the thermistor. Replace the power supply PCB and check for correct operation.
Code: C6050
Description: Abnormally low fixing unit thermistor temperature • The fixing temperature remains below 90C/194F for 1 s.
Causes: Poor contact in the thermistor connector terminals. Broken fixing thermistor wire. Fixing thermistor installed incorrectly. Fixing thermostat triggered. Fixing heater M or S installed incorrectly. Broken fixing heater M or S wire.
Remedy: Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Measure the resistance. If it is ∞Ω, replace the fixing thermistor. Check and reinstall if necessary. Check for continuity. If none, replace the fixing thermostat. Check and reinstall if necessary. Check for continuity. If none, replace the fixing heater M or S.
Code: C6400
Description: Zero-crossing signal problem • The engine PCB does not detect the zero-crossing signal for the time specified below. At power-on: 3 s Others: 5 s
Causes: Poor contact in the connector terminals. Defective power supply PCB. Defective engine PCB.
Remedy: Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Check if the zero-crossing signal is output from YC2-5 on the power supply PCB. If not, replace the power supply PCB. Replace the engine PCB if C6400 is detected while YC2-5 on the power supply PCB outputs the zero-crossing signal.
Code: C7800
Description: Broken external temperature thermistor • The input voltage is 0.5 V or less.
Causes: Poor contact in the humidity sensor connector terminals. Defective humidity sensor.
Remedy: Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Replace the drawer PCB and check for correct operation.