Brother MFC-9420CN Service Manual page 278

(2) Inner Jam
Problem item
Transportation Part
Fusing unit
P# Check item
Open the rear cover assy PU
for check.
Is there any paper inside the
1
unit?
Is the transfer roller firmly
2
locked by the lock lever?
Is the fusing unit properly
3
locked?
Is there any paper caught
4
between the rollers?
9 - 5 1
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Result Corrective action
Remove the paper inside.
YES
Fix the transfer roller with
NO
the lock lever.
Fix the fusing unit with
NO
the FU lock lever.
Remove the caught paper.
YES
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