TA Triumph-Adler DC 2015 - Manual (Page 17)

CHAPTER 3 PREPARATIONS BEFORE USE
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Press the Zoom (+) or Zoom (-) key and change the number
to select the paper size.
Press the enter key. The paper size indicator for the selected
paper size will light. Normal copying is enabled.
● Setting envelopes
When using the optional printer function, envelopes can be set in the
multi-bypass.
NOTE
The types of envelopes that can be used are COM-10, Monarch, DL
and C5. Up to 6 envelopes can be loaded in the multi-bypass at a
time.
Open the multi-bypass.
Align the insert guides with the envelope size.
Open the envelope and set it with the print side face-down
and its flap opposite to the insertion slot and then insert it
along the insert guide as far as it will go.
* Incorrectly loading envelopes can result in printing in the
wrong orientation or on the wrong side.