SC5xx: Paper Feed and Fusing

SC501-00

B

1st paper tray lift motor malfunction

This SC occurs if no paper is detected within the prescribed time when the tray is set correctly, and the tray lift motor starts rotating CW or CCW.

• Incorrect/disconnected tray lift motor connector
• Loose, disconnected or damaged tray lift sensor connector
• An obstruction such as jammed paper scraps blocks the motor operation

1. Replace the transport motor.
2. Reconnect the connector.
3. Replace the harness.
4. Replace the BiCU.

SC502-00

B

2nd paper tray lift motor malfunction (optional paper feed unit)

SC503-00

B

3rd paper tray lift motor malfunction (optional paper feed unit)

When the tray is lifted up, the tray lift motor error, or sensor error is detected.

• PFU tray lift motor disconnection or loose harness
• PFU tray lift sensor disconnection or loose harness
• PFU Tray bottom plate HP sensor disconnection or loose harness
• Other defective mechanical parts

Do the following steps. Cycle the power off/on after doing each step to check if the SC occurs.

1. Reconnect the connector of the PFU tray bottom plate HP sensor.
2. Reconnect the connector of the PFU tray lift sensor.
3. Replace the lift lever encoder, gear encoder for tray lift unit (‘rising unit’ in the parts catalog), and the tension spring for paper feed.
4. Replace the PFU tray lift motor.
5. Replace the harness.
6. Replace the board in the tray.

SC508-00

B

Bypass bottom plate error

The signal from the bypass lift sensor does not change for two seconds after the bypass lift clutch was activated.

If this condition occurs three consecutive times, this SC is generated.

• Disconnected or defective connectors of the bypass lift clutch
• Disconnected or defective bypass lift sensor
• Defective bypass bottom plate detection filler

1. Check or replace the connectors of the bypass lift clutch.
2. Check or replace the bypass lift sensor.

SC524-00

D

Transport motor error

The motor LOCK signal is detected for more than 2 seconds while the motor is ON.

• Paper transport unit overload
• Defective transport motor

1. Replace the paper transport unit.
2. Replace the transport motor.

SC524-01

D

Transport motor error (While the motor is OFF)

The motor LOCK signal is not detected for more than 2 seconds while the motor is OFF.

• Defective transport motor
• Disconnected harness for the motor
• Defective BiCU

1. Replace the transport motor.
2. Replace the harness for transport motor.
3. Replace the BiCU.

SC525-00

B

Transport motor error: bank 1

The motor LOCK signal from a bank 1 is detected while the motor is ON.

SC526-00

B

Transport motor error: bank 2

The motor LOCK signal from a bank 1 is detected while the motor is ON.

• Motor overload
• Defective motor
• Disconnected connectors
• Damaged harness

Do the following steps. Check if the SC reoccurs by cycling the power after each step.

1. Reconnect the connector.
2. Replace the harness.
3. Replace the transport motor.

SC530-00

D

Fusing heater exhaust fan motor error

SC531-00

D

Development cooling fan motor error

SC532-00

D

Writing cooling fan motor error

SC533-00

D

PSU fan motor error

The motor LOCK signal is detected 50 consecutive times (for 5 seconds) while the motor is ON.

• Defective fan motor
• Disconnected harness
• Defective BiCU

1. Replace the fan motor.
2. Replace the harness.
3. Replace the BiCU.

SC530-01

D

Fusing heater exhaust fan motor error (While the motor is OFF)

SC531-01

D

Development cooling fan motor error  (While the motor is OFF)

SC532-01

D

Writing cooling fan motor error  (While the motor is OFF)

SC533-01

D

PSU fan motor error  (While the motor is OFF)

The motor LOCK signal is not detected 140 consecutive times (for 14 seconds) while the motor is OFF.

• Defective fan motor
• Disconnected or defective harness
• Defective BiCU

1. Replace the fan motor.
2. Check or replace the harness.
3. Replace the BiCU.

SC540-00

D

Fusing motor error

The motor LOCK signal is detected for 2 seconds while the motor is ON.

• Defective motor
• Disconnected or defective harness
• Defective BiCU
• Fusing unit torque increased

1. Replace the fusing motor.
2. Check or replace the harness.
3. Replace the BiCU.
4. Replace the fusing unit.

SC540-01

D

Fusing motor error (While the motor is OFF)

The motor LOCK signal is not detected for 2 seconds while the motor is OFF.

• Defective motor
• Defective harness
• Defective BiCU

1. Replace the fusing motor.
2. Replace the harness.
3. Replace the BiCU.

SC541-01

A

Fusing thermopile error

SC541-11

D

Fusing thermopile error (Low power)

The machine detects the value of AD is the prescribed value for 0.2 consecutive seconds after the fusing lamp is activated.

• Broken thermopile
• Connector contact failure

1. Reconnect the connector between the fusing unit and the BiCU.
2. Replace the fusing thermopile
3. Replace the harness between the fusing unit and the BiCU.
4. Replace the BiCU.
5. Replace the PSU (AC).

SC542-02

A

Fusing thermopile reload error

Fusing temperature failed to reach a temperature of 80 degrees C after passing seven seconds when:

• The machine starts warming up.
• The machine returns from energy saver mode.
• The fusing lamp is activated.

Fusing temperature failed to reach the reload permit temperature after passing eight seconds when:

• The machine starts warming up.
• The machine returns from energy saver mode.
• The fusing lamp is activated.

• Dirty or deformed thermopile lenses
• Input voltage out of specification (out of warranty)
• Fuse blown out

1. Check the power supply voltage (Reconnect the power cord).
2. Check and clean the thermopile lenses or replace the fusing thermopile.
3. Replace the fusing unit.
4. Replace the BiCU.
5. Replace the PSU (AC).

SC542-12

D

Fusing thermopile cannot reload (low power)

Fusing temperature failed to reach a temperature of 80 degrees C after passing seven seconds when:

• The machine starts warming up.
• The machine returns from energy saver mode.
• The fusing lamp is activated.

SC542-13

D

Fusing thermopile cannot reload (low power)

Fusing temperature failed to reach the reload permit temperature after passing eight seconds when:

• The machine starts warming up.
• The machine returns from energy saver mode.
• The fusing lamp is activated.

• Dirty or defective thermopile lenses
• Thermopile modification/float
• Input voltage out of specification (out of warranty)
• Thermostat blown out.

1. Check the power supply voltage (Reconnect the power cord).
2. Check and clean the thermopile lenses or replace the fusing thermopile.
3. Replace the fusing unit.
4. Replace the BiCU.
5. Replace the PSU (AC).

SC543-00

A

Fusing thermopile overheat (software error)

Fusing thermopile detects a temperature of 240 degrees C or more for 10 seconds after the relay is activated.

• Triac short
• Defective BiCU

1. Reconnect the connector between the fusing unit and BiCU.
2. Replace the fusing thermopile.
3. Replace the harness between the fusing unit and BiCU.
4. Replace the BiCU.
5. Replace the PSU (AC).
6. Replace the fusing unit (if the problem cannot be resolved).

SC544-00

A

Fusing thermopile overheat (hardware error)

Fusing thermopile detects a temperature of 250 degrees C.

• Triac short
• Defective BiCU
• Defective fusing control system

Basically, the entire fusing unit must be replaced when SC554-00 occurs. For details, refer to "Actions When SC544-00 or SC554-00 Occurs."

Do the following steps:

1. Inspect the fusing sleeve belt unit, and replace if damaged.
2. Reconnect the connector between the fusing unit and BiCU.
3. Replace the fusing thermopile.
4. Replace the harness between the fusing unit and BiCU.
5. Replace the BiCU.
6. Replace the PSU (AC).

SC545-01

A

Fusing lamp consecutive full power

SC545-11

D

Fusing lamp consecutive full power (low power)

Fusing lamp runs at full power for consecutive four seconds after reloading the machine

• Defective thermistor
• Broken fusing lamp
• Thermostat blown out.

1. Check there is paper remaining in the fusing unit.
2. Check the power supply voltage (Reconnect the power cord).
3. Replace the fusing lamp.
4. Replace the fusing thermopile.
5. Replace the BiCU.
6. Replace the PSU (AC)

SC547-01

D

Zero cross error: fusing lamp relay contact welding

Zero cross signal is detected when the fusing relay is deactivated.

This SC is detected when:

• The main power is turned on.
• The machine returns from the engine-off mode.
• The interlock switch is deactivated.

• Damaged fusing relay
• Fusing relay drive circuit failure

1. Make sure that the harness between the PSC (AC) and BiCU is firmly connected.
2. Replace the PSU (AC).
3. Replace the BiCU.

SC547-02

D

Zero cross error: fusing lamp relay contact defective

Zero cross signal cannot be detected if the fusing relay is activated.

This SC is detected when:

• The main power is turned on.
• The machine returns from the engine-off mode.
• The interlock switch is turned off or on.

• Broken fusing relay (open circuit)
• Fusing relay circuit failure
• PSU fuse (24VS) worn out

1. Make sure that the harness between the PSU (AC) and BiCU is firmly connected.
2. Replace the PSU (AC).
3. Replace the BiCU.
4. Replace the harness between the PSU (AC) and BiCU.

SC547-03

D

Zero cross error: low frequencies error

The frequency of the power source is lower than 44Hz.

This SC is detected when the main power is ON.

• Unstable frequency

1. Check the frequency is 45Hz or more.
   If not, the power supply from the wall socket may be the cause. Ask for your supervisor or the electrician in charge at the site.
2. Replace the PSU (AC).

SC549-00

D

Fusing Center Low Temperature

After passing 60 seconds when FGATE is ON, thermopile detects a temperature of -100 degrees C from the compensated target temperature for consecutive 60 seconds.

• Fusing lamp disconnection during paper passing
• Loose connector

1. Check the input voltage and reconnect the power cord.
2. Replace the fusing lamp.
3. Replace the fusing thermopile
4. Replace the BiCU.
5. Replace the PSU (AC).

SC554-00

A

Fusing thermistor (NC sensor) detects high temperature (Hard)

Fusing thermistor (NC sensor) detects a temperature of 250 degrees C..

• Shorted triac
• Defective BiCU
• Defective fusing control system

Basically, the entire fusing unit must be replaced when SC554-00 occurs. For details, refer to "Actions When SC544-00 or SC554-00 Occurs."

Do the following steps:

1. Inspect the fusing sleeve belt unit, and replace if damaged.
2. Reconnect the connector between the fusing unit and the BiCU.
3. Replace the fusing thermistor.
4. Replace the harness between the fusing unit and the BiCU.
5. Replace the BiCU.
6. Replace the PSU (AC).

SC557-00

C

Zero cross frequency error

The frequency of the power source is 66Hz or more. This SC is detected just after the main power is turned ON.

• Noise (High frequency)
• Defective PSU

1. Check the power supply source.

SC559-00

A

Consecutive fusing jam

The paper jam counter for the fusing unit reaches three consecutive times (the fusing exit sensor does not detect the paper).

• Paper jam in the fusing unit.

1. Replace the separation plate.
2. Replace the gear (fusing unit).
3. Replace the fusing unit.
4. Replace the fusing motor.
5. Replace the gear (mainframe), if damaged.

SC561-01

A

Pressure roller thermistor (center) disconnection

SC561-11

A

Pressure roller thermistor (center) disconnection (low power)

Pressure roller thermistor (center) detects a temperature of -20 degrees C for 20 consecutive seconds after the fusing lamp is activated when the machine starts, or during feeding paper or in low power.

• Thermistor disconnection
• Loose connector

1. Reconnect the connectors between the fusing drawer connector, the BiCU, and the pressure roller thermistor.
2. Replace the thermistor.
3. Replace the fusing unit.
4. Replace the harnesses between the BiCU and the fusing unit.
5. Replace the BiCU.
6. Replace the PSU (AC).

SC562-02

A

Pressure roller thermistor (center) cannot be reloaded

SC562-12

A

Pressure roller thermistor (center) cannot be reloaded (low power)

Pressure roller thermistor (center) detects that the temperature does not reach a temperature of 40 degrees C for 25 consecutive seconds when the main power is turned on.

• Dirty or deformed thermistor
• Input voltage out of specification (out of warranty)
• Thermostat blown out

1. Check the input voltage and reconnect the power cord.
2. Replace the fusing thermostat.
3. Replace the fusing lamp.
4. Replace the thermistor.
5. Replace the BiCU.
6. Replace the PSU (AC).

SC563-00

A

Pressure roller overheat (software error): Center

Pressure roller thermistor (center) detects a temperature of 248 degrees C 10 times after the fusing relay is ON.

• Shorted triac
• Defective BiCU

1. Reconnect the connectors between the fusing drawer connector, BiCU, and the pressure roller thermistor.
2. Replace the thermistor.
3. Replace the harnesses between the BiCU and pressure roller thermistor.
4. Replace the BiCU.
5. Replace the fusing unit if all the above steps cannot resolve the issue.

SC564-00

A

Pressure roller overheat (hardware error): Center

Pressure roller thermistor (center) detects a temperature of 248 degrees C.

• Shorted triac
• Defective BiCU
• Defective fusing control system

1. Reconnect the connectors between the fusing drawer connector, BiCU, and the pressure roller thermistor.
2. Replace the thermistor.
3. Replace the harnesses between the BiCU and pressure roller thermistor.
4. Replace the BiCU.
5. Replace the fusing unit if all the above steps cannot resolve the issue.

SC571-01

A

Pressure roller thermistor (rear) disconnection

SC571-11

A

Pressure roller thermistor (rear) disconnection (low power)

Pressure roller thermistor (rear) detects a temperature of -20 degrees C or less for 20 consecutive seconds after the fusing lamp is activated in a specified condition.

• Thermistor disconnection
• Loose connector

1. Check the input voltage and reconnect the power cord.
2. Reconnect the connectors between the fusing drawer connector, the BiCU, and the pressure roller thermistor.
3. Replace the thermistor.
4. Replace the fusing unit.
5. Replace the harnesses between the BiCU and the fusing unit.
6. Replace the BiCU.
7. Replace the PSU (AC).

SC572-02

A

Pressure roller thermistor (rear) cannot be reloaded

SC572-12

D

Pressure roller thermistor (rear) cannot be reloaded (low power)

Fusing temperature failed to 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.

• Dirty or deformed thermistor
• Input voltage out of specification (out of warranty)
• Thermostat blown out

1. Check the input voltage and reconnect the power cord.
2. Replace the fusing thermostat.
3. Replace the fusing lamp.
4. Replace the thermistor.
5. Replace the BiCU.
6. Replace the PSU (AC).

SC573-00

A

Pressure roller overheat (rear) (software error)

Pressure roller thermistor (rear) detects a temperature of 248 degrees C for 10 consecutive times in a specific machine condition.

• Shorted triac
• Defective BiCU

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.

SC574-00

A

Pressure roller (rear) overheat (hardware error)

Pressure roller thermistor (rear) detects a temperature of 248 degrees C.

• Shorted triac
• Defective BiCU
• Defective fusing control system

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.

SC581-01

A

Fusing thermistor disconnection

SC581-02

A

Shorted fusing thermistor

SC581-11

D

Fusing thermistor disconnection (low power)

SC581-12

D

Shorted fusing thermistor (low power)

• Thermopile disconnection (SC581-01)
• Shorted fusing thermistor (SC581-02)
• Loose connector

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 PSU (AC).

SC591-01

A

Pressure roller thermistor (front) disconnection

SC591-11

D

Pressure roller thermistor (front) disconnection (low power)

Pressure roller thermistor (front) detects a temperature of -20 degrees C or less for 20 consecutive seconds when the fusing lamp is activated.

• Thermistor disconnection
• Loose connector

1. Reconnect the connectors between the fusing unit, fusing drawer connector, and BiCU.
2. Replace the thermistor.
3. Replace the fusing unit.
4. Replace the harnesses between the BiCU and the fusing drawer connector.
5. Replace the BiCU.
6. Replace the PSU (AC).

SC592-02

A

Pressure roller thermistor (front) 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 or smaller than 216 mm.

• Dirty or deformed thermistor
• Input voltage out of specification (out of warranty)
• Thermostat blown out

1. Check the input voltage and replace the power plug.
2. Replace the fusing thermostat
3. Replace the fusing lamp.
4. Replace the thermistor.
5. Replace the BiCU.
6. Replace the PSU (AC).

SC593-00

A

Pressure roller thermistor (front) high temperature (software error)

Pressure roller thermistor (front) detects a temperature of 248 degrees C for consecutive 10 times when the fusing lamp is activated.

• Shorted triac
• Defective BiCU

1. Reconnect the connectors between the fusing unit, fusing drawer connector, and BiCU.
2. Replace the thermistor.
3. Replace the harnesses between the BiCU and the fusing drawer connector.
4. Replace the BiCU.

Replace the fusing unit if all the above steps cannot resolve the issue.

SC594-00

A

Pressure roller thermistor (front) high temperature (hardware error)

Pressure roller thermistor (front) detects a temperature of 248 degrees C.

• Shorted triac
• Defective BiCU
• Defective fusing control system

1. Reconnect the connectors between the fusing unit, fusing drawer connector, and BiCU.
2. Replace the thermistor.
3. Replace the harnesses between the BiCU and the fusing drawer connector.
4. Replace the BiCU.

Replace the fusing unit if all the above steps cannot resolve the issue.