Lexmark T640DTN User's Guide - Page 27
Installing a duplex unit
UPC - 734646725224
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Installing and removing options Installing a duplex unit The duplex unit attaches under the printer, below the standard tray and above any drawers. Note: Two optional duplex units are available. The 250-sheet duplex unit only works with printers that have a 250-sheet standard tray, and the 500-sheet duplex unit only works with printers that have a 500sheet standard tray. Make sure you have the appropriate duplex unit for the tray size installed in the printer. 1 Place the duplex unit on top of any installed drawers or the table or printer cabinet where you plan to use the printer. The tab, round peg, and square holes on top of any drawer help you position the duplex unit so the edges are aligned properly. Make sure it is securely in place. Tab Square hole Round peg Installing a duplex unit 27