Toshiba e-STUDIO6520C Service Handbook page 466

[C4B0] IGBT overheating abnormality
1. Check the LGC board
(1) Check if the conductor pattern on the board is short circuited or open circuited.
(2) Check if SRAM is mounted.
(3) Replace the LGC board.
2. Clear the status counter
Change the values "30" or above, or "4" of the status counter (08-400) to "0".
[C4B1] Fuser unit voltage judgment abnormality
(1) Check if any of the harnesses in the fuser unit is open circuited.
(2) Check if any of the connectors CN305, CN306 and CN330 on the LGC board is open circuited.
(3) Check if there is any abnormality on the harnesses between the connectors CN305, CN306 and
CN330 on the LGC board and the fuser unit.
(4) Replace the LGC board.
(5) Replace the fuser unit.
(6) Check if the AC input connector on the IH board is disconnected.
(7) Check if the connector CN404 of the switching regulator is disconnected.
(8) Check if the fuse of the IH board has blown.
(9) Replace the IH board.
(10) Replace the FIL board.
[C4D0] Fuser belt thermopile abnormality
1. Check the thermopile
(1) Check if the connector of the thermopile is disconnected.
(2) Check if the harnesses of the fuser belt center thermopile and the fuser belt side thermopile are
open circuited.
(3) Replace the thermopile.
2. Check the LGC board
(1) Check if the connector CN333 is disconnected.
(2) Check if the conductor pattern on the LGC board is open circuited or short circuited.
(3) Replace the LGC board.
3. Cancel the service call
After repairing the matter which caused the error [C4D0], turn the power OFF and then back ON to
cancel the service call. However, the counter value will be stored until it is written over by the value of
the other service call.
e-STUDIO5520C/6520C/6530C
ERROR CODE and TROUBLESHOOTING
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