Printer Repair Questions? Ask IT Technicians for Answers ASAP
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You will need to insert the envelopes into the center of the input tray with the envelope flap on the left and facing up. If the flap is on the short end of the envelope, ensure you insert the envelope into the center of the tray with the flap away from the printer and facing up.
The paper sensor will not detect the envelope if it is not inserted on the correct side.