Brother HL-3450CN Service Manual page 322

I-17 Color Misregistration
Phenomenon
Color misregistration is caused between two colors as shown in
46.
Main Causes
(1) The OPC belt cartridge is not properly installed.
(2) The OPC belt cartridge is deformed.
(3) The cleaning brush of the drum cleaner is unstable in operation.
(4) Rotational load on the OPC belt cartridge is excessive.
** This problem might occur in the first page printed in color mode immediately after printing
in monochrome mode, or the first page immediately after turning on the printer.
Countermeasures
(1) Reset the OPC belt cartridge properly.
(2) Replace the OPC belt cartridge with a new one. (See
(3) Replace the drum cleaner with a new one.
I-18 Toner Streak
Phenomenon
Brush mark line of uneven scanning density is caused in the image as shown in
(18) of Page 8-46.
Main Causes
(1) Main blade of the developer unit and the reset roller is not normal.
(2) Location of the toner cartridge is not correct.
(3) Transport paddle in the toner cartridge is deformed.
(4) Brush mark line appears in the continuous printing of high coverage (solid) patterns.
Countermeasures
(1) Replace the toner cartridge with a new one.
(2) Temporarily suspending the printing, agitate the toner cartridge and stabilize the
replenishment of toner.
Section 4.1 of Chapter
8-59
HL-3450CN SERVICE MANUAL
print sample (17) of Page 8-
6.)
print sample