-4-Optical Adjustments[Before Adjustment]- Input a 100% of black raster signal.1 Loosen a screw A (Fig.1) on the polarized glass mounting basewhich you intend to adjust.2 Adjust the slot B to obtain the darkest brightness on the screen byusing a hex screwdriver.3 Tighten the screw A to fix the polarized glass mounting base.Contrast adjustmentBefore taking optical adjustments below, remove the Cabinet Top following to the “Mechanical Disassembly”.Adjustments require a .0mm hex wrench and a slot screwdriver. When you adjust Integrator lens or Relay lensadjustment, you need to disconnect FPC cables of LCD panels on the main board.Optical adjustment requires a .0mm hex wrench and a slot screwdriver.Note: Do not disconnect connectors on the main board, because the projector cannot turn on due to operate thepower failure protection.WArNING : uSe uV rAdIAtIoN eYe ANd SKIN Pro-tectIoN durING SerVIcINGcAutIoN: to prevent suffer of uV radiation, those adjustment must becompleted within 25 minutes.A Slot BFig.1Polarized glassmounting base