Brother MFC-9420CN Service Manual page 270

I-19 Residual Image
Phenomenon
Image of the preceding page appears on every other page as shown in
Main Causes
(1) Cleaning failure due to the lifted cleaning brush of the transfer unit cleaner.
(2) Contact failure of the belt cleaner's bias terminal.
(3) Failure of HV power supply unit PU.
Cleaning roller PU
Fusing unit FU
Rear cover ASSY PU
Transfer roller ASSY PU
Registration roller ASSY PU
Transfer unit PU
Paper feed roller PU
Countermeasures
(1) Check if the c
leaning roller PU
(2) Replace the HV power supply unit PU with a new HV power supply unit PU.
Fig. 9-20
is properly installed or not.
9 - 4 3
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print sample [20] of Fig.9-1.
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