HP 3500 - Manual (Page 83)

3. Set the paper width guides.
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4. Load up to 10 envelopes in the center of Tray 1 with the side to be printed on facing up,
with the stamp area closest to the printer, and the short edge toward the printer. Slide the
envelopes into the printer as far as they will go without forcing them.
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5. Adjust the guides to touch the envelope stack without bending the envelopes. Make sure
the envelopes fit under the tabs on the guides.
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Printing envelopes
1. If Tray 1 is configured for a specific size, use the printer control panel to set the paper
size for Tray 1 to match the size envelope you are printing.
2. Specify Tray 1 or select the paper source by size in the printer driver.
ENWW Configuring trays 71