HP 2 - Manual (Page 70)

envelopes
guidelines
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Avoid using envelopes that: have clasps or windows; have thick, irregular, or
curled edges; are shiny or embossed; are wrinkled, torn, or otherwise
damaged.
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Align the envelope edges before inserting them in the In tray.
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In tray capacity: Up to 10 envelopes
preparing to print
1. Raise the printer cover.
2. Slide the paper guide to the left.
3. Raise the Out tray.
4. Place the envelopes, with the printable side down and the flap to the left, in
the right-hand side of the In tray. Push the envelopes into the printer until
they stop.
5. Lower the Out tray.
6. Slide the paper guide firmly against the edge of the envelopes.
7. Lower the printer cover.
printing
1. Open the Printer Properties dialog box, then select the following:
tab setting