• Code: 545-02
• Description: Heater continuously heat: Low voltage An error is detected only when the input voltage at power-on is low. An error is detected when the target temperature cannot be reached for 10 seconds or more after reloading.
• Causes: • Thermistor detection error • Heater damaged • After over-heat prevention
• Remedy: • Replace the thermistor (center). • Replace the heater. • Clear this SC by executing SP5-810-001.

• Code: 547-01
• Description: Zero cross error (relay-contact soldering) When a zero cross signal is detected consecutively three times or more, this SC is issued. When a zero cross signal is detected consecutively less than three times, the error counter for the zero cross signal increments, and then the machine retries the checking out the zero cross signal again.
• Causes: • Fusing relay defective (contact soldering, contact open) • Drive circuit of the fusing relay defective • PSU fuse (24 VS) damaged • Frequency instability of input power line
• Remedy: • Replace the fusing relay. • Replace the fuse of the PSU.

• Code: 547-02
• Description: Zero cross error (relay-contact fault) When a zero cross signal is detected consecutively three times or more, this SC is issued. When a zero cross signal is detected consecutively less than three times, the machine tries to turn off the relay of the fusing unit.
• Causes: • Fusing relay defective (contact soldering, contact open) • Drive circuit of the fusing relay defective • PSU fuse (24 VS) damaged • Frequency instability of input power line
• Remedy: • Replace the fusing relay. • Replace the fuse of the PSU.

• Code: 547-03
• Description: Zero cross error (low-frequency error) When low frequency is detected once, the SC557 is determined. When low frequency is detected twice or more, this SC is issued.
• Causes: • Fusing relay defective (contact soldering, contact open) • Drive circuit of the fusing relay defective • PSU fuse (24 VS) damaged • Frequency instability of input power line
• Remedy: • Replace the fusing relay. • Replace the fuse of the PSU.

• Code: 549-01
• Description: Temperature lowering detection When the thermistor (center) detects 75°C lower than the target temperature of each paper type for 60 seconds continuously after the registration roller has started to rotate, this SC is issued.
• Causes: • Heater damaged during paper feeding • Heater not connected correctly.
• Remedy: • Reconnect the heater. • Replace the heater.

• Code: 549-02
• Description: Temperature lowering detection: Low voltage When fusing temperature does not reach the target temperature for each paper type for the specified time with SP1-105-043 (default: 60 sec) after the fusing pre-rotation due to the low voltage, this SC is issued.
• Causes: • Heater damaged during paper feeding • Loose connectors • Lowering the input voltage
• Remedy: • Reconnect the heater. • Replace the heater.

• Code: 549-03
• Description: Temperature lowering detection: Low voltage When fusing temperature does not reach the target temperature for each paper type for the specified time with SP1-124-104 (default: 30 sec) after the machine has entered the CPM down level 3 in the low voltage operation mode, this SC is issued.
• Causes: • Heater damaged during paper feeding • Loose connectors • Lowering the input voltage
• Remedy: • Reconnect the heater. • Replace the heater.

• Code: 551-01
• Description: Thermistor (edge) disconnection Temperature of 0°C or lower is detected for 7 seconds continuously. Detection time: 10 or more Measurement interval: 0.5 sec.
• Causes: • Thermistor (edge) disconnection • Thermistor (edge) not connected correctly
• Remedy: • Reconnect the thermistor (edge). • Replace the thermistor (edge). • Clear this SC by executing SP5-810-001.