Kyocera FSC5025N

Error Code:

Code: 7401
Description: Black developer unit non- installing error
The toner sensor 4 inside the black developer unit did not output the density detection signal, judged the engine controller PWB (A0004) the black developer unit is not installed.ЯP
Causes: Defective harness of the toner sensor 4, defective connection of the connector between black developer unit and the printer main unit or poor contact of the connector terminals. Defective toner sensor 4. Defective engine controller PWB (A0004). Defective engine relay PWB (A0009).
Remedy: Defective harness of the toner sensor 4, defective connection of the connector between black developer unit and the printer main unit or poor contact of the connector terminals. Check the damage of harness of the toner sensor 4, check the connection of the connector with the black developer unit and the printer main unit, if there is trouble, remedy or replace. Defective toner sensor 4. Replace the black developer unit. Defective engine controller PWB (A0004). Replace the engine controller PWB (A0004). Defective engine relay PWB (A0009). Replace the engine relay PWB (A0009).

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