• Code: C447
• Description: Fixer temperature of 40°C or lower in READY state
• Causes: MAIN board
• Remedy: 1. Check the thermistors 1. Check if the connectors are disconnected. 2. Check if the center and edge thermistors are in contact with the surface of the fuser roller properly? 3. Check if the center and edge thermistors are not deformed or dirty. 4. Check if the harnesses of the center and edge thermistors are open circuited. 2. Check the heater 1. Check if the heater is broken. 2. Check if the connector of the heater is disconnected. 3. Check if the harnesses are connected properly to the terminals of the heater lamp. 4. Check if the thermostat is blown. 3. Check the MAIN board 1. Check if the connectors <25S: CN11, 25H/25F: CN10> are disconnected. 2. Check if the conductor pattern on the MAIN board is short circuited or open circuited. 3. Replace the MAIN board 4. Check the power supply 1. Check if the connectors are disconnected. 2. Replace the switching regulator. 5. Clear the status counter After repairing the matter which caused the error [C447], perform the following: 1. Turn ON the power while [0] and [8] are pressed simultaneously. 2. Key in “2002”, then press [START]. 3. Change the current status counter value “7”or “24” to “0”, then press [OK] (to cancel [C447]). 4. Turn the power OFF and then back ON. Make sure that the equipment enters the normal ready state.

• Code: C449
• Description: Fixer temperature of 240°C or higher during printing
• Causes: MAIN board
• Remedy: 1. Check the thermistors 1. Check if the connectors are disconnected. 2. Check if the center and edge thermistors are in contact with the surface of the fuser roller properly? 3. Check if the center and edge thermistors are not deformed or dirty. 4. Check if the harnesses of the center and edge thermistors are open circuited. 2. Check the heater 1. Check if the heater is broken. 2. Check if the connector of the heater is disconnected. 3. Check if the harnesses are connected properly to the terminals of the heater lamp. 4. Check if the thermostat is blown. 3. Check the MAIN board 1. Check if the connectors CN10 are disconnected. 2. Check if the conductor pattern on the MAIN board is short circuited or open circuited. 3. Replace the MAIN board 4. Check the power supply 1. Check if the connectors are disconnected. 2. Replace the switching regulator. 5. Clear the status counter After repairing the matter which caused the error [C449], perform the following: 1. Turn ON the power while [0] and [8] are pressed simultaneously. 2. Key in “2002”, then press [START]. 3. Change the current status counter value "9", "19", "21", "22", "23", "25", "27", "29" or "45" to "0", then press [OK] (to cancel [C449]). 4. Turn the power OFF and then back ON. Make sure that the equipment enters the normal ready state.

• Code: C452
• Description: Differential of more than 50°C between center thermistor and side thermistor when READY temperature is reached
• Causes: MAIN board
• Remedy: 1. Check the thermistors 1. Check if the connectors are disconnected. 2. Check if the center and edge thermistors are in contact with the surface of the fuser roller properly? 3. Check if the center and edge thermistors are not deformed or dirty. 4. Check if the harnesses of the center and edge thermistors are open circuited. 2. Check the MAIN board 1. Check if the connectors CN10 are disconnected. 2. Check if the conductor pattern on the MAIN board is short circuited or open circuited. 3. Replace the MAIN board 3. Clear the status counter After repairing the matter which caused the error [C452], perform the following: 1. Turn ON the power while [0] and [8] are pressed simultaneously. 2. Key in “2002”, then press [START]. 3. Change the current status counter value “62” to “0”, then press [OK] (to cancel [C452]). 4. Turn the power OFF and then back ON. Make sure that the equipment enters the normal ready state.

• Code: C4B0
• Description: Fixer error counter outside of specification
• Causes: MAIN board
• Remedy: 1. Check the MAIN board 1. Check if the conductor pattern on the MAIN board is short circuited or open circuited. 2. Check if the Memory(IC24) is installed properly. 3. Replace the MAIN board 2. Clear the status counter After repairing the matter which caused the error [C4B0], perform the following: 1. Turn ON the power while [0] and [8] are pressed simultaneously. 2. Key in “2002”, then press [START]. 3. Rewrite the displayed counter with “0” and then press the [OK] button ([C4B0] clear). 4. Turn the power OFF and then back ON. Make sure that the equipment enters the normal ready state.

• Code: C911
• Description: Abnormal access between the CTRG board and MAIN board
• Causes: Toner cartridge MAIN board HRNS-MAIN-PU-240 CTIF board
• Remedy: 1 Does the recommended toner cartridge display appear when the toner supply cover is opened and closed? Use the recommended TOSHIBA toner cartridge. 2 Toner cartridge • Check the phenomenon by removing the toner cartridges and reinserting them. • Check that the CTRG board of the cartridge is installed properly. 3 Contact point on the equipment side Check that the spring of the contact point is not deformed. 4 Is the spring of the contact point returned when it is pushed lightly? • Check that the CTIF board is installed properly. • Board check 5 MAIN board • Connector check (CN16) • Board check 6 HRNS-MAIN-PU-240 • Connector check (CN16: Main board, CN150: CTIF board) • Harness check 7 CTIF board • Check that the board is installed properly. • Board check

• Code: C940
• Description: Engine-CPU abnormality
• Causes: MAIN board
• Remedy: Main power switch Turn OFF the main power switch, then back ON. Engine-CPU and FROM Check if the conductor pattern between the Engine-CPU and FROM is short circuited or open circuited. MAIN board Board check

• Code: C950
• Description: The abnormalities in a MAIN board. Other service call The engine firmware being downloaded to the main board is not the same as the machine.
• Causes: MAIN board
• Remedy: MAIN board Check that the wrong board is not installed, if it is wrong, replace it. Engine firmware Check that the model of the machine is correct, if it is wrong, download the data again.

• Code: C970
• Description: High-voltage transformer abnormality
• Causes:
• Remedy: 1. Is the main charger installed securely? 2. Check if the spring of high-voltage supply contact point is deformed. 3. Check if the needle electrode is broken or the main charger grid is deformed. 4. Check if any foreign matters is on the needle electrode or the main charger grid. 5. Check if the transfer roller and the separation needle are installed securely. 6. Check if the transfer roller or the separation needle is removed. 7. Check if there is any foreign matter attached on the transfer roller or the separation needle.