Brother MFC-7240 Basic User's Manual page 111

Examples of poor print quality
Hollow print
All black
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
White lines across the page
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
Lines across the page
Recommendation
 Make sure that you use paper that meets our specifications.
Rough-surfaced paper may cause the problem. (See Acceptable
paper and other print media uu page 17.)
 Choose Thick Paper mode in the printer driver (FAX-2950, MFC-
7240 and MFC-7290), choose Thick in the machine
Type menu setting or use thinner paper than you are currently
using. (See Paper Type uu page 17 and Software User's Guide:
Basic Tab.)
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 Check the machine s environment. Conditions such as high
humidity can cause hollow print. (See Product Safety Guide:
Choose a safe location for your product.)
The drum unit may be damaged. Put in a new drum unit. (See

Replacing the drum unit uu page 60.)
 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 uu page 67.)
 The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit uu page 60.)
 The fuser unit may be contaminated. Call Brother Customer
Service or your local Brother dealer.
 Make sure that you use paper that meets our specifications. A
rough surfaced paper or thick print media can cause problems.
 Make sure that you choose the appropriate media type in the
printer driver (for FAX-2950, MFC-7240 and MFC-7290) or in the
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machine s Paper Type menu setting. (See Acceptable paper
and other print media uu page 17 and Software User's Guide:
Basic Tab.)
 The problem may disappear by itself. Print multiple pages to clear
this problem, especially if the machine has not been used for a
long time.
 The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit uu page 60.)
Clean the corona wire of the drum unit. (See Cleaning the corona

wire uu page 67.)
 Clean the drum surface. (See Cleaning the drum unit
uu page 69.)
 The drum unit may be damaged. Put in a new drum unit. (See
Replacing the drum unit uu page 60.)
Troubleshooting
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s Paper
103
B