Brother MFC-9420CN, Service Manual

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Confidential 9-10
Error Code
(Hex)
Symptom Probable Cause Solution
The waste toner box is
not assembled. Assemble the waste toner
box.
73
Waste toner box full or
un-device
The waste toner box is
full. Replace the waste toner
box with a new one.
74
OPC belt exchange Replacement timing of
the OPC belt. Replace the OPC belt with
a new one.
75
Fuser unit exchange Replacement timing of
the fuser unit. Replace the fuser unit
with a new one.
76
Transfer roller Replacement timing of
the transfer roller. Replace the transfer roller
with a new one.
77
120K Kit exchange Replacement timing of
the 120K kit. Replace the 120K kit with
a new one.
78
PF Kit2 exchange Replacement timing of
the PF Kit2. Replace the PF Kit2 with
a new one.
79
Wasted toner box near-full
(exchange) The waste toner box is
nearly full. Replace the waste toner
box with a new one.
7A
Top cover open error The top cover is
opened. Close the top cover.
7B
Back cover open error The back cover is
opened. Close the back cover.
7C-7F
Not used
Paper smaller than the
specified size loaded in
the paper tray Load the correct size of
paper.
80
AT the start of FAX message
printing, the controller detects
that paper is smaller than A4
size in length.
Engine controller board
PCB defective Replace the engine
controller board PCB.
81
Recording paper jam. (The
paper width sensor stays ON
even after completion of paper
ejection operation.)
(Not used.)
--- ---
82
Recording paper jam in paper
pull-in operation
(The paper width sensor fails
to detect the leading edge of
paper.) (Not used.)
--- ---
Paper is not correctly
set in the paper tray Reload paper.
Separation pad
damaged Replace the paper tray.
Registration sensor
actuator unhooked Set the registration sensor
actuator into place.
83 Recording paper jam.
(The registration sensor comes
ON too early in the paper
feeding operation.)
Engine controller board
PCB defective Replace the engine
controller board PCB.