HP Deskjet 5650 - Manual (Page 116)

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 20 envelopes
preparing to print
1. Remove the Out tray, then remove all paper from the In tray.
2. Slide the paper width guide all the way to the left, then pull out the paper length
guide.
3. Place the envelopes, with the printable side down and the flap to the left, in the
right side of the In tray. Push the envelopes into the printer until they stop.
4. Slide the paper guides firmly against the envelopes.
5. Replace the Out tray.