Brother MFC7840W Trouble Error Codes List

Brother MFC7840W Trouble Error Codes List

Code	Description	Causes
50	Replacement time of the drum unit	• Replace the drum unit with a new one.
56	Fuser cover opened	• Check if the Fuser cover is closed correctly. Harness connection failure of back cover switch ASSY Eject actuator failure Eject sensor PCB ASSY failure Main PCB failure
58	Fuser unit failure (Stand ready in the given time)
59	Fuser unit failure
5A	HVPS PCB ASSY failure	HVPS PCB failure (Developing bias voltage failure) HVPS PCB ASSY harness connection failure HVPS PCB failure Main PCB failure
5B	New toner detecting lever malfunction	New toner detection switch harness connection failure New toner detection switch failure Main PCB failure
63	Toner cartridge is at the end of life.	• Gently shake the toner cartridge from side to side and install it again. • Replace the toner cartridge. Harness connection failure of new toner sensor harness ASSY. Harness connection failure of toner sensor PCB unit ASSY. New toner sensor harness ASSY failure (Toner empty) Toner sensor PCB unit ASSY failure. Main PCB failure
67	Toner of the toner cartridge is low	• Prepare a new toner cartridge. If the toner is empty, Replace it.
68	Fuser unit failure (The side thermistor detects higher temperature than the specified value.)
69	Fuser unit failure (The side thermistor detects lower temperature than the specified value.)
6A	Fuser unit failure (The side thermistor does not detect 60°C within the specified time.)
6B	Fuser unit failure (The center thermistor does not detect 100°C within the specified time.)
6C	Fuser unit failure (The center thermistor detects higher temperature than the specified value.)
6D	Fuser unit failure (The center thermistor detects lower temperature than the specified value.)
6E	Fuser unit failure (The center thermistor does not detect temperature rising within the specified time.)

6F	Fuser unit failure (The center and side thermistors detect extremely high temperature.)
71	Polygon motor failure (Cannot detect the period signal of the polygon mirror motor.)
72	BD beam detecting sensor malfunction	Laser unit harness connection failure. Laser unit failure. Main PCB failure
75	Machine cooling down inside	The temperature inside the machine is too high. Both ends of the heat roller are at different temperatures. The paper media is replaced with different Paper size media.
76	Fuser unit failure (The center thermistor detects rapidly rising temperature.)
77	Fuser unit failure Fuser error code failure (The error history of the fuser unit is deleted.)
78	Fuser unit failure (The temperature sensor of the fuser unit is broken.)
79	No detection of the internal temperature thermistor	Harness connection failure of internal temperature thermistor Internal temperature thermistor failure Main PCB failure
7A	No detection of main motor lock signal	Main motor failure Main PCB failure
7B	Main PCB failure
7D	Dirt on drum unit	• Clean the corona wire of the drum unit. • Replace the drum unit with a new one. Dirt or dust on drum unit electrodes HVPS PCB failure Main PCB failure
7F	Fax paper setting mismatch (The setting paper becomes besides the A4/Letter/Legal/Folio.)
80	Fax paper size is small (The registration rear sensor detected the paper that is smaller than the letter size.)
84	Paper jam in rear of the machine (It is detects by the eject sensor)
88	Paper jam inside the machine (It is detects by the registration rear sensor)

8A	Paper jam in Tray 1 (T1) (It is detects by the registration front sensor)
8D	Paper jam near paper eject tray (When power on, it is detects by the eject sensor.)
9F	Paper empty (It is detects by the registration front sensor)
A1	Front cover open
A2	Document is too long. (During scanning, 90 cm or longer of a document is detected.)
A3	Document rear sensor is not turned on when feeding the document.
A5	Fax scanning error (First warning only)
A6	Fax scanning error (The second warning that the same error with A5 occurs again)
AD	DMA transfer error
AF	FB unit home position failure
B0	Harness for scanning is not connected correctly.
B7	Detection error of scanner (Scanning reference voltage adjustment malfunction.)
B9	Scanning light adjustment error.
BB	White level data error
E6	NVRAM error on main PCB

EC	Fan performance malfunction
F8	Battery connection failure
F9	Maintenance mode 74 Non-decision (Inputting omission of the customizing code.)

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