1 - 20 Phaser 840/850/860/8200 Color Printer - Service ManualCombination sensors and their meaningsCombinations of sensors are used by the printer to determine the type of standard (orupper) media tray installed in the printer.Media tray type sensingThe combinations of the three tray sensors inform the print engine what type of media trayis installed. (The print engine does not detect the type of media installed in the tray; itonly detects the particular tray being used by the presence of sensor flags on the side of thetray.) The tray sensors are located on the right-side interior of the paper tray slot, mountedon I/O board right. There are five tray types: Letter (A-size). This tray is sized for 8.5 x 11-inch (U.S.) paper as well aslow-volumes of A-size transparency film. Metric Letter (A4-size). This tray is used for 210 x 297 mm (Metric) paper aswell as low-volumes of A4-size transparency film. High-volume Transparency/Label (A). This tray supports high volumes ofU.S.-size transparency film as well as laser quality, adhesive label stock. High-volume Transparency/Label (A4). This tray supports high volumes ofMetric-size transparency film as well as laser quality, adhesive label stock. Legal Tray (Phaser 860 only) This tray supports Legal-size, US 8.5 x 14 inchpaper.Table 1-5 Tray switch sensor combinationsTray type A Paper A4 Paper ATransparencyA4TransparencyLegal SizeTop switch Closed Open Closed Open ClosedMiddle switch Open Closed Open Closed ClosedBottomswitchOpen Open Closed Closed OpenThe slide switch actuators on the media trays will open aswitch in the forward position and close a switch in the rearposition.
