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Preparation before Use 
Loading Envelopes
5 envelopes may be loaded in the multi purpose tray.
Acceptable envelope sizes are as follows.
Switching to Envelop Mode (FS-2100D/FS-2100DN)
To print on an envelope, follow the procedure below to switch to envelope mode.
1 Open the rear cover.
2 To print on an envelope, raise the envelope switch.
Acceptable Envelope Size
Youkei 2 114 × 162 (mm)
Youkei 4 105 × 235 (mm)
Monarch 3 7/8" × 7 1/2"
Envelope #10 (Commercial #10) 4 1/8" × 9 1/2"
Envelope DL 110 × 220 (mm)
Envelope C5 162 × 229 (mm)
Executive 7 1/4" × 10 1/2"
Envelope #9 (Commercial #9) 3 7/8" × 8 7/8"
Envelope #6 (Commercial #6 3/4) 3 5/8" × 6 1/2"
Note  When the printing on envelopes is completed, return the envelope switch to its original position (at the 
bottom).
CAUTION  The fuser unit inside the printer is hot. Do 
not touch it with your hands as it may result in burn 
injury.