• Code: 571-01
• Description: Pressure roller thermistor (rear) disconnection Pressure roller thermistor (Rear) detects a temperature of -11 degrees C or less for 20 consecutive seconds after the fusing lamp is activated in a specified condition.
• Causes: • Thermistor disconnection • Loose connector
• Remedy: • Reconnect the connectors between the fusing drawer connector, the BiCU, and the pressure roller thermistor. • Replace the thermistor. • Replace the fusing unit. • Replace the harnesses between the BiCU and the pressure roller thermistor. • Replace the BiCU or the AC controller board.

• Code: 571-11
• Description: Pressure roller thermistor (rear) disconnection (low power) Pressure roller thermistor (rear) detects a temperature of -11 degrees C or less for 20 consecutive seconds after the fusing lamp is activated in a specified condition.
• Causes: • Thermistor disconnection • Loose connector
• Remedy: • Check the input voltage and replace the power plug. • Reconnect the connectors between the fusing drawer connector, the BiCU, and the pressure roller thermistor. • Replace the thermistor. • Replace the fusing unit. • Replace the harnesses between the BiCU and the pressure roller thermistor. • Replace the BiCU or the AC controller board.

• Code: 572-02
• Description: Pressure roller thermistor (rear) cannot be reloaded The machine temperature does not reach a temperature of 50 degrees C when 100 seconds passes after starting a job where the paper width is wider than 206 mm AND is equal to or smaller than 216 mm.
• Causes: • Dirty or deformed thermistor • Input voltage out of specification (out of warranty) • Fuse blown out
• Remedy: • Check the input voltage and replace the power plug. • Replace the fusing thermostat. • Replace the fusing lamp. • Replace the thermistor. • Replace the BiCU. • Replace the AC controller board.

• Code: 572-12
• Description: Pressure roller thermistor (rear) cannot be reloaded (low power) The machine temperature does not reach a temperature of 50 degrees C when 100 seconds passes after starting a job where the paper width is wider than 206 mm AND is equal or smaller than 216 mm.
• Causes: • Dirty or deformed thermistor • Input voltage out of specification (out of warranty) • Fuse blown out
• Remedy: • Check the input voltage and replace the power plug. • Replace the fusing thermostat. • Replace the fusing lamp. • Replace the thermistor. • Replace the BiCU. • Replace the AC controller board.

• Code: 573-00
• Description: Pressure roller overheat (software error): End Pressure roller thermistor (rear) detects a temperature of 230 degrees C for 10 consecutive times in a specific machine condition.
• Causes: • Shorted triac • IOB error • BiCU error
• Remedy: 1. Reconnect the connectors between the fusing drawer connector, the BiCU, and the pressure roller thermistor. 2. Replace the thermistor. 3. Replace the harnesses between the BiCU and the pressure roller thermistor. 4. Replace the BiCU. • Replace the fusing unit if all the above steps cannot resolve the issue.

• Code: 574-00
• Description: Pressure roller overheat (hardware error): End Pressure roller thermistor detects the prescribed temperature.
• Causes: • Shorted triac • IOB error • BiCU error • Fusing unit: out of control
• Remedy: 1. Reconnect the connectors between the fusing drawer connector, the BiCU, and the pressure roller thermistor. 2. Replace the thermistor. 3. Replace the harnesses between the BiCU and the pressure roller thermistor. 4. Replace the BiCU. • Replace the fusing unit if all the above steps cannot resolve the issue.

• Code: 581-01
• Description: Fusing thermistor disconnection. These SCs are detected if the machine detects the prescribed timing when: • The machine starts up. • The machine returns from the energy saver mode. • The machine stays in low power mode.
• Causes: • Thermopile disconnection (SC581-01) • Shorted fusing thermistor (SC581-02) • Loose connector
• Remedy: 1. Check the input voltage and replace the power plug (SC581-11/-12). 2. Reconnect the connectors between the fusing unit, fusing drawer connector, and BiCU. 3. Replace the fusing thermistor. 4. Replace the fusing unit. 5. Replace the harnesses between the BiCU and the fusing drawer connector. 6. Replace the BiCU. 7. Replace the AC controller board.

• Code: 581-02
• Description: Shorted fusing thermistor. These SCs are detected if the machine detects the prescribed timing when: • The machine starts up. • The machine returns from the energy saver mode. • The machine stays in low power mode.
• Causes: • Thermopile disconnection (SC581-01) • Shorted fusing thermistor (SC581-02) • Loose connector
• Remedy: 1. Check the input voltage and replace the power plug (SC581-11/-12). 2. Reconnect the connectors between the fusing unit, fusing drawer connector, and BiCU. 3. Replace the fusing thermistor. 4. Replace the fusing unit. 5. Replace the harnesses between the BiCU and the fusing drawer connector. 6. Replace the BiCU. 7. Replace the AC controller board.