Error code c440

Hello sir; C440in this machine,it means fuser unit problem, but it can be reset the procedure as follow;
1, hold down "0" and "8" keys while turn on the power.
2, enter 400 press start.
3, enter 0 press set or enter.

If 1st time occur, u can just go to 08-400, reset the value to "0" then restart the machine.



When this code not cleat 08-400 then check these all thengs..
1.Check the thermistors
(1) Check if the connectors are disconnected.
(2) Check if the main and edge thermistors are in contact with the surface of the fuser roller properly?
(3) Check if the harnesses of the main and edge thermistors are open circuited.

2. Check the IH board and IH coil

(1) Check if the IH coil is broken.
(2) Check if the connector of the IH coil is disconnected.
(3) Check if the thermostat is blown.
(4) Check if the connectors on the IH board are disconnected (AC input connector and LGC I/F connector
CN455/456).
(5) Check if the IH board or the switching power supply unit are abnormal.
• Replace the IH control board.

3. Check the LGC board
(1) Check if the connectors CN316 are disconnected.
(2) Check if the conductor pattern on the LGC board is short circuited or open circuited.
(3) Replace the LGC board.

Thanks
Best Regards