SEEMS TO BE CONSTANT ROTATIONAL/CYCLICAL THUMPING WHEN PRINTING - USING TRAY 1 AND/OR 2.
Two possibilities I can provide:
1. The fuser pressure roller is out of round and the noise is the flat spot hitting the hot roller on every rotation.
2. These printers have an envelope mode that activates a solenoid in the fuser when printing envelopes to force air out of an envelope.
If it makes the noise constantly then it is the fuser. If only as the page is exiting then it is the envelope mode.
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