Brother HL-3450CN Service Manual page 315

CHAPTER 8 TROUBLESHOOTING
I-6
Phenomenon
Vertical white line appears in the specific color area when test-printed in the four color mode
(Stripe Mode), as shown in
Main Causes
(1) Foreign particles adhering to the following places around the developer roller. (Refer to
Fig.8-12.)
N
Between the cartridge cover and developer roller (a)
N
On the surface of the developer roller (b)
N
Between the blade fixing plate and the developer roller (c)
N
Between the blade and the developer roller (d)
(2) Foreign particles adhering to the toner cartridge's main blade of the color in question.
(a)
(b)
(c)
(d)
Blade fixing plate
Countermeasures
(1) Implement the test print.
(2) Confirm the color of the toner cartridge in question that has caused the white line.
(3) Remove the foreign particles adhering to the developer roller.
If foreign particles adhere to (d) of Fig.8-12, remove them referring to one of the figures
below.
Approx. 1 cm
White Line (1)
print sample (6) of Page
Developer roller
Developer blade
Piece of OHP
sheet
Fig. 8-8
8-45.
Fig. 8-7
Fig. 8-9
8-52
Developer roller