Brother HL-2400C Service Manual page 302

I-25 Vertical Smear
Phenomenon
Printed image is smeared vertically as shown in
Main Causes
1) Paper dust between the cleaning blade and OPC belt.
2) Debris adhering to the base of a toner cartridge's developer roller where it contacts
with the OPC belt.
Countermeasures
1) Remove paper dust between the cleaning blade and OPC belt referring to the figure
below.
2) Replace the OPC belt cartridge with a new one.
I-26 Black Toner Light
Phenomenon
Black color of printed image is light as shown in
printer clatters at the same time.
Main Causes
Black toner in the cartridge has solidified because the printer is used under high
temperature circumstance or due to continuous printing.
Countermeasures
Replace the black toner cartridge with a new one.
print sample (25) of
OPC Belt Cartridge
Fig.8-10
print sample (26) of
VIII-56
Fig.8-2.
Fig.8-2, and the