HP DeskJet 3700 - Manual (Page 16)

4. Pull out the output tray and the output tray extender, and then lift the paper catch.
To load envelopes
1. Raise the input tray and input tray extender.
2. Insert one or more envelopes into the far-right side of the input tray and slide the stack of envelopes
down until it stops. The side to be printed on should face up.
3. Slide the paper-width guide to the right against the stack of envelopes until it stops.
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