SC No.

Type

Error Name/Error Condition/Major Cause/Solution

SC540-01

D

Press-release sensor (S2) error
The press-release sensor (S2) does not turn on or off after passing 30 seconds from the start of the fuser compression or decompression.
  • The fusing thermistor cannot detect the normal temperature with paper strip.
  • The fuser press-release does not operate properly.
  • The press-release sensor (S2) is not properly attached.
  • The connector or FFC is not connected properly. Or, the wire or FFC is faulty.
  • The fusing motor is not properly attached, or it is faulty.
  • The parts such as the press-release sensor (S2) in the fusing unit are faulty.
  • The paper exit PCB (PCB8) is faulty.
  • The engine relay PCB (PCB21) is faulty.
  • The firmware is not the latest version.
  • The main/engine PCB (PCB1) is faulty.
  1. Remove a piece of paper remaining in the fusing unit.
  2. Check if the pressure can be reduced by reverse-rotating the fuser gear.
  3. Check if the press-release sensor (S2) is interrupted by the actuator during the decompression operation.
  4. Reconnect the following wire connectors and clean FFC and reconnect. If there is no continuity, replace the wire. If the FFC terminal section is deformed or FFC is broken, replace the FFC.
    • Press-release sensor (S2) - paper exit PCB (PCB8)
    • Paper exit PCB (PCB8) - main/engine PCB (PCB1)
    • Fusing motor (M2) - engine relay PCB (PCB21)
    • Engine relay PCB (PCB21) - main/engine PCB (PCB1)
  5. Reattach the fusing motor. If it is not repaired, replace it.
  6. Replace the fusing unit.
  7. Replace the paper exit PCB (PCB8).
  8. Replace the engine relay PCB (PCB21).
  9. Upgrade the engine firmware to the latest version.
  10. Replace the main/engine PCB (PCB1).

SC No.

Type

Error Name/Error Condition/Major Cause/Solution

SC541-00

D

Broken fusing thermistor 1 (TH1) error
Fusing thermistor 2 (TH2) detects the low temperature for 1.6 seconds when the fusing thermistor 1 (TH1) detects 30 °C / 86 °F or higher.
  • The fusing thermistor cannot detect the normal temperature with paper strip.
  • The connector is not properly connected or the wire is faulty.
  • The normal temperature cannot be detected with the fusing heater not being turned on, broken fusing thermostat wire, etc.
  • The firmware is not the latest version.
  • The main/engine PCB (PCB1) is faulty.
  • The paper exit PCB (PCB8) is faulty.
  1. Remove a piece of paper remaining in the fuser unit.
  2. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire.
    • Fusing unit (fusing thermistor) - paper exit PCB (PCB8)
    • Paper exit PCB (PCB8) - main/engine PCB (PCB1)
  3. Replace the fuser unit.
  4. Upgrade the engine firmware to the latest version.
  5. Replace the main/engine PCB (PCB1).
  6. Replace the paper exit PCB (PCB8).

SC No.

Type

Error Name/Error Condition/Major Cause/Solution

SC542-00

D

Fusing thermistor 2 (TH2) low temperature error
During standby or printing, the fusing thermistor 2 (TH2) detected 100°C / 212°F or less for 1 second continuously.
  • The power supply voltage reduces.
  • The fusing thermistor cannot detect the normal temperature with paper strip.
  • The connector is not properly connected or the wire is faulty.
  • The normal temperature cannot be detected with the fusing heater not being turned on, broken fusing thermostat wire, etc.
  • The firmware is not the latest version.
  • The main/engine PCB (PCB1) is faulty.
  • The PSU (PCB9) is faulty.
  • The paper exit PCB (PCB8) is faulty.
  1. Connect the power cord to a different wall outlet if the power supply voltage descends by 10% or more of the rated voltage, or multiple devices use the same outlet.
  2. Remove a piece of paper remaining in the fuser unit.
  3. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire.
    • Fusing unit (fusing thermistor) - paper exit PCB (PCB8)
    • Paper exit PCB (PCB8) - main/engine PCB (PCB1)
    • PSU (PCB9) - main/engine PCB (PCB1)
  4. Replace the fusing unit.
  5. Upgrade the engine firmware to the latest version
  6. Replace the main/engine PCB (PCB1).
  7. Replace the PSU (PCB9) when the fusing heaters always turn on.
  8. Replace the paper exit PCB (PCB8).

SC No.

Type

Error Name/Error Condition/Major Cause/Solution

SC543-00

D

Fusing thermistor 2 (TH2) high temperature error
Fusing thermistor 2 (TH2) detects 240°C / 464°F or more for 1 second.
  • The fusing thermistor cannot detect the normal temperature with paper strip.
  • The connector is not properly connected or the wire is faulty.
  • The fusing thermistor cannot detect correct temperature due to foreign objects adhering to the fusing heat roller or fusing press roller, short-circuit of the fusing thermistor, etc.
  • The firmware is not the latest version.
  • The main/engine PCB (PCB1) is faulty.
  • The PSU (PCB9) is faulty.
  • The paper exit PCB (PCB8) is faulty.
  1. Remove a piece of paper remaining in the fuser unit.
  2. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire.
    • Fusing unit (fusing thermistor) - paper exit PCB (PCB8)
    • Paper exit PCB (PCB8) - main/engine PCB (PCB1)
    • PSU (PCB9) - main/engine PCB (PCB1)
  3. Replace the fusing unit.
  4. Upgrade the engine firmware to the latest version
  5. Replace the main/engine PCB (PCB1).
  6. Replace the PSU (PCB9) when the fusing heaters always turn on.
  7. Replace the paper exit PCB (PCB8).

SC No.

Type

Error Name/Error Condition/Major Cause/Solution

SC544-01

D

Fusing heater error
The input from fusing thermistor 2 (TH2) is abnormal for 1 second continuously.
  • The fusing thermistor cannot detect the normal temperature with paper strip.
  • The connector is not properly connected or the wire is faulty.
  • The normal temperature cannot be detected with the fusing heater not being turned on, broken fusing thermostat wire, etc.
  • The firmware is not the latest version.
  • The main/engine PCB (PCB1) is faulty.
  • The paper exit PCB (PCB8) is faulty.
  1. Remove a piece of paper remaining in the fuser unit.
  2. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire.
    • Fusing unit (fusing thermistor) - paper exit PCB (PCB8)
    • Paper exit PCB (PCB8) - main/engine PCB (PCB1)
  3. Replace the fusing unit.
  4. Upgrade the engine firmware to the latest version
  5. Replace the main/engine PCB (PCB1).
  6. Replace the paper exit PCB (PCB8).

SC No.

Type

Error Name/Error Condition/Major Cause/Solution

SC544-02

D

Fusing heater 2 error
  1. During warm-up, fusing thermistor 1 (TH1) does not detect 100°C / 212°F if turning the fusing heater 2 on for 30 seconds continuously.
  2. During warm-up, if turning the fusing heater 2 on for 30 seconds continuously after the temperature detected by the fusing thermistor 1 (TH1) reaches 100°C / 212°F , fusing thermistor 1 (TH1) does not detect the ready state temperature.
  • The fusing thermistor cannot detect the normal temperature with paper strip.
  • The connector is not properly connected or the wire is faulty.
  • The normal temperature cannot be detected with the fusing heater not being turned on, broken fusing thermostat wire, etc.
  • The firmware is not the latest version.
  • The main/engine PCB (PCB1) is faulty.
  • The PSU (PCB9) is faulty.
  • The paper exit PCB (PCB8) is faulty.
  1. Remove a piece of paper remaining in the fusing unit.
  2. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire.
    • Fusing unit (fusing thermistor) - paper exit PCB (PCB8)
    • Paper exit PCB (PCB8) - main/engine PCB (PCB1)
    • PSU (PCB9) - main/engine PCB (PCB1)
  3. Replace the fusing unit.
  4. Upgrade the engine firmware to the latest version
  5. Replace the main/engine PCB (PCB1).
  6. Replace the PSU (PCB9) when the fusing heaters always turn on.
  7. Replace the paper exit PCB (PCB8).

SC No.

Type

Error Name/Error Condition/Major Cause/Solution

SC544-03

D

Fusing heater high temperature error
Fusing thermistor 1 (TH1) detected 240 °C / 464 °F for 1 second continuously
  • The fusing thermistor cannot detect the normal temperature with paper strip.
  • The connector is not properly connected or the wire is faulty.
  • The normal temperature cannot be detected with the fusing heater not being turned on, broken fusing thermostat wire, etc.
  • The firmware is not the latest version.
  • The main/engine PCB (PCB1) is faulty.
  • The PSU (PCB9) is faulty.
  1. Remove a piece of paper remaining in the fusing unit.
  2. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire.
    • Fusing unit (fusing thermistor) - paper exit PCB (PCB8)
    • Paper exit PCB (PCB8) - main/engine PCB (PCB1)
    • PSU (PCB9) - main/engine PCB (PCB1)
  3. Replace the fusing unit.
  4. Upgrade the engine firmware to the latest version
  5. Replace the main/engine PCB (PCB1).
  6. Replace the PSU (PCB9) when the fusing heaters always turn on.

SC No.

Type

Error Name/Error Condition/Major Cause/Solution

SC547-00

D

Zero-cross signal error
The zero-cross signal is not input for 1 second continuously when the fusing heater turns on and the 24 V broken wire is not detected.
  • The connector is not properly connected or the wire is faulty.
  • The low voltage PWB is faulty.
  • The firmware is not the latest version.
  • The main/engine PWB is faulty.
  1. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire.
    PSU (PCB9) - main/engine PCB (PCB1)
  2. Replace the PSU (PCB9) when the fusing heaters always turn on.
  3. Upgrade the engine firmware to the latest version.
  4. Replace the main/engine PCB (PCB1).

SC No.

Type

Error Name/Error Condition/Major Cause/Solution

SC549-00

D

Broken fusing heater 1 error
  1. During warm-up, the temperature detected by fusing thermistor 2 (TH2) does not reach 100 °C / 212 °F when passing 20 seconds.
  2. During warm-up, when passing 30 seconds after the temperature detected by fusing thermistor 2 (TH2) reaches 100 °C / 212 °F , the ready state temperature is not reached.
  • The fusing thermistor cannot detect the normal temperature with paper strip.
  • The connector is not properly connected or the wire is faulty.
  • The normal temperature cannot be detected with the fusing heater not being turned on, broken fusing thermostat wire, etc.
  • The firmware is not the latest version.
  • The main/engine PCB (PCB1) is faulty.
  • The PSU (PCB9) is faulty.
  • The paper exit PCB (PCB8) is faulty.
  1. Remove a piece of paper remaining in the fusing unit.
  2. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire.
    • Fusing unit (fusing thermistor) - paper exit PCB (PCB8)
    • Paper exit PCB (PCB8) - main/engine PCB (PCB1)
    • PSU (PCB9) - main/engine PCB (PCB1)
  3. Replace the fusing unit.
  4. Upgrade the engine firmware to the latest version
  5. Replace the main/engine PCB (PCB1).
  6. Replace the PSU (PCB9) when the fusing heaters always turn on.
  7. Replace the paper exit PCB (PCB8).

SC No.

Type

Error Name/Error Condition/Major Cause/Solution

SC552-00

D

Fusing thermistor 1 (TH1) low temperature error
Fusing thermistor 1 (TH1) detects a temperature lower than 100 °C / 212 °F for 1 second in succession during ready or print.
  • The power supply voltage reduces.
  • The fusing thermistor cannot detect the normal temperature with paper strip.
  • The connector is not properly connected or the wire is faulty.
  • The normal temperature cannot be detected with the fusing heater not being turned on, broken fusing thermostat wire, etc.
  • The firmware is not the latest version.
  • The main/engine PCB (PCB1) is faulty.
  • The PSU (PCB9) is faulty.
  • The paper exit PCB (PCB8) is faulty.
  1. Connect the power cord to a different wall outlet if the power supply voltage descends by 10% or more of the rated voltage, or multiple devices use the same outlet.
  2. Remove a piece of paper remaining in the fusing unit.
  3. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire.
    • Fusing unit (fusing thermistor) - paper exit PCB (PCB8)
    • Paper exit PCB (PCB8) - main/engine PCB (PCB1)
    • PSU (PCB9) - main/engine PCB (PCB1)
  4. Replace the fusing unit.
  5. Upgrade the engine firmware to the latest version.
  6. Replace the main/engine PCB (PCB1).
  7. Replace the PSU (PCB9) when the fusing heaters always turn on.
  8. Replace the paper exit PCB (PCB8).

SC No.

Type

Error Name/Error Condition/Major Cause/Solution

SC583-00

C

Outer temperature sensor (S8) error
The sensor input sampling exceeds the reference value. (After detection, controlled at 25 °C / 77.0 °F)
  • The connector is not properly connected or the wire is faulty.
  • The outer temperature sensor (S8) is not properly attached, or it is faulty.
  • The firmware is not the latest version.
  • The main/engine PWB is faulty.
  1. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire.
    Outer temperature sensor (S8) - main/engine PCB (PCB1)
  2. Reattach the outer temperature sensor (S8). If it is not repaired, replace it.
  3. Upgrade the engine firmware to the latest version.
  4. Replace the main/engine PCB (PCB1).