Description: Fusing Lamp Overheat Error The fusing lamps remained ON at full capacity for more than 9 s after the fusing temperature attains reload temperature.
Causes: • Deformed thermistor • Thermistor not in the correct position • Defective fusing lamp 1. Replace the fusing unit. 2. Replace the fusing lamp. • Execute "Reset Fusing Unit SC" to recover the machine after completing the recovery procedure. Otherwise, the machine continues to issue this SC code and cannot be operated.
Code: 547
Description: Zero cross error • The zero cross signal is detected three times even though the fusing lamp relay is off when turning on the main power. • The zero cross signal is not detected for 3 seconds even though the fusing lamp relay is on after turning on the main power or closing the front door. • The detection error occurs twice or more in 11 zero cross signal detections. This error is defined when the detected zero cross signal is less than 45. • The zero cross signal is not detected three times while the main power remains ON.
Causes: • Defective fusing relay • Defective fusing relay circuit • Shorted +24V fuse on the PSU • Unstable power supply. 1. Check the power supply source. 2. Replace the +24V fuse on the PSU. 3. Replace the PSU
Code: 557
Description: Zero cross frequency error The zero cross signal is detected ten times while the fusing lamp relay remains ON after turning on the main power.
Causes: • Defective fusing lamp relay • Defective drive circuit of the fusing lamp relay • Unstable input power source 1. Check the power supply source. 2. Replace the fusing unit. • Execute "Reset Fusing Unit SC" to recover the machine after completing the recovery procedure. Otherwise, the machine continues to issue this SC code and cannot be operated.
Code: 559
Description: Fuser 3times jam error The paper jam counter for the fusing unit reaches 3. The paper jam counter is cleared if the paper is fed correctly. This SC is activated only when this function is enabled with "Engine Maintenance" (default "OFF").
Causes: • Defective fusing unit • Defective fusing control 1. Clear this SC to send a command after a jam removal. 2. Turn off this function after a jam removal. • Execute "Reset Fusing Unit SC" to recover the machine after completing the recovery procedure. Otherwise, the machine continues to issue this SC code and cannot be operated.
Code: 669
Description: EEPROM communication error An unexpected value exists in the initialization flag of the EEPROMe PSUt unit.
Causes: • EEPROM not connected • Defective EEPROM 1. Installing the EEPROM. 2. Replacing the EEPROM.
Code: 688
Description: CTL_PRREQ_N signal does not come. The ECB does not receive a memory address command from the controller 20 seconds after paper is in the position for registration.
Causes: • Defective controller board • Communication error 1. Turn the machine's main power off, and then on. 2. Check if the controller board is firmly connected to the ECB.