Dell S3840cdn User Manual page 23

Installing the Security Cover
To make your print media in Tray 1 more secure, install the security cover onto Tray 1.
1 Pull Tray 1 out of the printer about 200 mm.
2 Hold Tray 1 with both hands, and remove it from the printer.
3 Place the security cover on the top of Tray 1.
4 Insert Tray 1 into the printer, and push until it stops.
Preparing Printer Hardware
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