190-00820-08 Rev. ACirrus Perspective™ by Garmin – Pilot’s Guide for the SR20/SR22/SR22T54SYSTEM OVERVIEWSYSTEMOVERVIEWFLIGHTINSTRUMENTSEISAUDIO PANEL& CNSFLIGHTMANAGEMENTHAZARDAVOIDANCEAFCSADDITIONALFEATURESAPPENDICESINDEX1.7 DISPLAY BACKLIGHTINGThe dimming bus is the primary source for backlighting adjustments of the PFD and MFD displays, bezel, AudioPanel keys, AFCS Control Unit keys, and PFD/MFD Control Unit keys. The automatic backlighting adjustmentfor the AFCS Control Unit annunciators and PFD/MFD Control Unit annunciators uses photocell technology toautomatically adjust for ambient lighting conditions. Photocell calibration curves are pre-configured to optimizedisplay appearance through a broad range of cockpit lighting conditions. Manual backlighting adjustment canbe accomplished using the existing instrument panel dimming bus or the following procedures. In normaloperating mode, backlighting can only be adjusted from the PFD. In Reversionary Mode, it can be adjusted fromthe remaining display.Adjusting display backlighting:1) Press the PFD MENU Key to display the PFD Setup Menu. ‘AUTO’ is now highlighted next to ‘PFD DSPL’.2) Turn the small FMS Knob to select ‘MANUAL’.3) Press the ENT Key. The intensity value is now highlighted.4) Use the FMS Knob to enter the desired backlighting then press the ENT Key.5) Turn the large FMS Knob to highlight ‘AUTO’ next to ‘MFD DSPL’ and repeat steps 2-4.6) To remove the menu, press the CLR or MENU Key.Adjusting key backlighting:1) Press the PFD MENU Key to display the PFD Setup Menu. ‘AUTO’ is now highlighted next to ‘PFD DSPL’.2) Turn the large FMS Knob to highlight ‘PFD DSPL’.3) Turn the small FMS Knob in the direction of the green arrowhead to display ‘PFD KEY’.4) Turn the large FMS Knob to highlight ‘AUTO’.5) Turn the small FMS Knob to select ‘MANUAL’.6) Press the ENT Key. The intensity value is now highlighted.7) Use the FMS Knob to enter the desired backlighting and press the ENT Key.8) Turn the large FMS Knob to highlight ‘MFD DSPL’.9) Turn the small FMS Knob in the direction of the green arrowhead to display ‘MFD KEY’ and repeat steps 4-7.10) To remove the menu, press the CLR or MENU Key.Figure 1-44 PFD Setup MenuPFD
