Brother HL-4040CDN - Manual (Page 139)

Routine Maintenance
130
6
d
Push to release the latches of the white corona wire cover (1), and then open the cover.
Note
We recommend that you clean the corona wire for each of the colors. If you want to clean only the corona
wire of the color that caused the print quality problem, see the illustration below to identify the position of
each of the corona wires.
1 Corona wire cover for Black (K)
2 Corona wire cover for Yellow (Y)
3 Corona wire cover for Magenta (M)
4 Corona wire cover for Cyan (C)
1
1
2
2
2
2
1
1
1
1
1
2
3
4