• Code: 542
• Description: Fusing Temperature Warm-up Error The hot roller did not reach the ready temperature within 4 min. 30 sec. after power on. -or- After 5 sec. and 5 rotations of the hot roller, the machine detected that the temperature rise was less than 3C .
• Causes: • Fusing lamp connections loose, broken, defective • Fusing lamp defective • Thermistor not touching the hot roller • Thermistor defective • MCU defective
• Remedy: The ready temperature is determined by the state of the machine at recovery: • Ready Temp. = Target Fusing Temp. (if power on or recovery starts when the hot roller is 80°C or higher). • Ready Temp. = Target Fusing Temp. – 10°C (SP1105-1 default) if power on or recovery starts when the hot roller is less that 80°C. • Ready Temp. = Target Fusing Temp. – 20°C (SP1937-3 default) if power on or recovery starts with pressure roller inching control on.

• Code: 543
• Description: Fusing Lamp Overheated: Error 1 The circuit on the MCU that monitors the temperature of the board detected a fusing temperature of 230C (446F) for longer than 2 sec.
• Causes: • MCU defective
• Remedy:

• Code: 545
• Description: Fusing Lamp Overheated: Error 2 After the hot roller reached the ready temperature, the fusing lamp stayed on at full power for 50 sec. while the hot roller was not rotating.
• Causes: • Hot roller thermistor not positioned correctly • Fusing lamp harness loose, disconnected, defective • MCU defective
• Remedy:

• Code: 546
• Description: Fusing Temperature Errors. The machine detected that the fusing temperature was fluctuating out of range for more than 60 sec. (7 readings detected temperature fluctuating more than ±20C)
• Causes: • Thermistor connection loose, disconnected, defective • Hot roller thermistor not positioned correctly • Fusing lamp connections loose, disconnected, defective • MCU defective
• Remedy:

• Code: 547
• Description: Zero-Cross Signal Errors. This error occurs if the machine fails to detect 50/60 Hz on the power supply line. Note: The zero-cross signal from the ac power supply generates a trigger pulse to control the power supply of power. (It automatically detects 50/60 Hz.)
• Causes: • Check that the frequency of the power supply to the machine is correct • PSU defective • MCU defective
• Remedy:

• Code: 551
• Description: Pressure roller center thermistor error 1 During the hot roller temperature control sequence, or while the hot roller and pressure roller were rotating, the pressure roller center thermistor measured a value higher than 3.3V 10 consecutive times at 600 ms intervals.
• Causes: • Pressure roller center thermistor not positioned properly • Pressure roller center thermistor connector loose, broken, defective • Pressure roller center thermistor defective • MCU defective
• Remedy:

• Code: 553
• Description: Pressure roller center thermistor error 2 During the hot roller temperature control sequence, the pressure roller center thermistor measures a value lower than 0.2V.
• Causes: • Pressure roller center thermistor not positioned properly • Pressure roller center thermistor connector loose, broken, defective • Pressure roller center thermistor defective • MCU defective
• Remedy:

• Code: 557
• Description: Applied zero-cross waveform error. The applied power ac frequency was detected less than 66 Hz more than 10 times.
• Causes: • Noise on the ac power supply line
• Remedy: