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-23-■ Optical AdjustmentBefore taking optical adjustments below, remove the Cabinet Top and Main Board following to the “MechanicalDisassemblies”Adjustments require a 2.0mm hex wrench and a slot screwdriver. When you adjust Integrator lens or Relay lensadjustment, you need to disconnect some connectors and FPC cables of LCD panels on the main board.Note:Do not disconnect connectors on the main board, because the projector can not turn on or operate properly foradjustment.[Before Adjustment]- Input a 100% of black raster signal.[R/G/B-CONTRAST ADJUSTMENT]1. Loosen a screw A on the polarized glass mounting base whichyou intend to adjust.2. Turn the polarized glass mounting base as shown in Fig. 1 toobtain the darkest brightness on the screen.3. Tighten the screw A to fix the polarized glass mounting base.Repeat steps 1 to 3 for remaining polarized glasses.Slot BPolarized GlassMounting BaseA1. CONTRAST ADJUSTMENTFig. 1B-Polarized GrassMounting BaseAG-Polarized GrassMounting BaseAR-Polarized GrassMounting BaseAFig. 2