Epson EPL-N2050+ Setup Manual page 30

4. If you are installing two units, remove the other unit from its
carton, and carefully lower it onto the bottom unit. Be sure
that the pins and electronic connector are properly aligned.
5. Make sure all corners of the upper unit fit securely onto the
bottom unit. Remove the paper cassette from the upper unit.
Then, insert and tighten the three screws as shown below.
6. Reinstall the paper cassette into the upper unit.
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Installing the Options