Brother HL- SERIES User Manual page 142

Troubleshooting
Examples of poor print
quality
B DEFGH
abc efghijk
A C D
b c d e
1 3 4
Wrinkles or creases
Envelope creases
Recommendation
 Make sure that the paper is loaded properly. See Printing from the paper tray
(plain paper, recycled paper and thin paper only) on page 10.
 Check the paper type and quality. See Acceptable paper and other print media
on page 3.
 Turn over the stack of paper in the tray or try rotating the paper 180 in the input
tray.
 Make sure that the two green envelope levers inside the back cover are pulled
down when you print the envelope.
Note
When you have finished printing, open the back cover and reset the two green
levers back to their original position.
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