Brother HL-1660e Series User Manual page 181

USER'S GUIDE
3–14
Before loading envelopes in the cassette, check the following:
• Envelopes should have a lengthwise sealing flap.
• The sealing flaps should be crisply and correctly folded (irregularly
cut or folded envelopes may cause paper jams).
• Envelopes should consist of two layers of paper in the following
marked area.
Feeding Direction
Fig. 3-4 Envelopes
Note
If envelopes get smudged during printing, set the print density to a higher
value in the ADVANCED MODE with MODE switch for darker
printouts. To adjust the print density setting, see
Test Pattern or Demo Page" in Chapter
• Envelope joints that are sealed by the manufacturer should be secure.
• All sides should be properly folded without any wrinkles or creases.
"Checking the Printed
2.