Brother MFC-9420CN Service Manual page 238

Error Code
(Hex)
84 Recording paper jam.
(The registration sensor stays
ON after completion of paper
ejection operation.)
85 No paper tray loaded.
86 Tray2 Open
87 Paper Type Error
88 Recording paper jam. (Even
after paper pulling-in
operation, the registration
sensor is still OFF.)
89 Not used.
8A The paper feed motor does not
rotate. (Not used.)
8B The paper feed motor stops
suddenly. (Not used.)
8C Not used.
8D-A0 Not used.
Symptom
The paper ejection
roller does not rotate
correctly
Foreign materials in the
paper path.
Registration sensor
actuator caught on the
surrounding parts
Registration sensor
broken
Main PCB defective
Recording paper not
loaded correctly
Registration sensor
broken
Separation pad
damaged
Objects, such as bits of
paper or chips, are in
the paper tray or paper
tray
Paper pick up roller
defective
Paper feed motor
broken
Main PCB defective
9 - 1 1
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Probable Cause
Replace the paper ejection
roller.
Remove foreign materials.
Correct the surrounding
parts on which the
actuator caught.
Replace the sensor PCB.
Replace the main PCB.
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Instruct the user to load
the recording
Replace the registration
sensor.
Replace the paper tray.
Remove the objects from
the paper tray.
Replace the paper pick up
roller.
Replace the paper feed
motor ASSY.
Replace the main PCB.
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Solution
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