Got a LaserJet 400 M401dn with an extra 500 sheet tray. Both trays are loaded with A4 plain paper for heavy load printing (~700 pages per day). The print jobs are coming from an very old program which does not support multiple trays (you can just select different printers inside the programs printing preferences). Now, when the first tray is empty, the printer prompts for new paper and displays " press "OK" to use another media". How can i disable this message? This printer must use the next tray automatical when the first tray is empty. How can I do that? Firmware is up to date (20150212).
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