Troubleshooting and routine maintenance
99
B
Faint
Check the machine’s environment. Conditions such as humidity, high
temperatures, and so on, may cause this print fault. (See Choosing a
location onpage 80.)
If the whole page is too light, Toner Save mode may be on. Turn off
Toner Save mode in the machine menu settings or Toner Save
mode in the printer Properties of the driver. (See Toner Save
on page 23 or Advanced tab in the Software User’s Guide on the CD-
ROM.)
Clean the scanner window and the corona wire of the drum unit. (See
Cleaning the laser scanner window on page 116 and Cleaning the
corona wire on page 118.)
The toner cartridge may be damaged. Put in a new toner cartridge.
(See Replacing a toner cartridge on page 122.)
The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit on page 125.)
Toner specks
Make sure that you use paper that meets our specifications. Rough-
surfaced paper may cause the problem. (See Acceptable paper and
other print media onpage 14.)
Clean the corona wire and the drum unit. (See Cleaning the corona
wire onpage 118 an d Cleaning the drum unit onpage 120.)
The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit on page 125.)
The fuser unit may be contaminated. Call your Brother dealer for
service.
All black
Clean the corona wire inside the drum unit by sliding the green tab.
Be sure to return the green tab to the home position (a). (See
Cleaning the corona wire on page 118.)
The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit on page 125.)
The fuser unit may be contaminated. Call your Brother dealer for
service.
Examples of poor print
quality
Recommendation
ABCDEFGH
abcdefghijk

ABCD

abcde

01234

C
DE
F
d
ef
g

BC

b

c

d

2

3

ABCDEFGH
abcdefghijk
ABCDabcde01234