Page 5-8 500 SERIES INSTALLATION MANUALRev G P/N 190-00181-025.2.8 MAIN CDI/OBS CONFIG PageSelect the MAIN CDI/OBS CONFIG Page (see Figure 5-9). This page allows you to verify the MAIN CDI outputs,both lateral (LAT) and vertical (VERT), and verify andcalibrate the MAIN OBS input. Using the controls on the500 Series unit front panel, make the selections below andverify the interfaces as appropriate:CDI (LAT/VERT)Selection Verify That:Max left/up The CDI is “pegged” to the left/up.Full left/up The CDI is deflected full scale to the left/up.Center The CDI is centered.Full right/down The CDI is deflected full scale to the right/down.Max right/down The CDI is “pegged” to the right/down.NAV FLAG (LAT/VERT)Selection Verify That:Hidden The LAT/VERT flag is hidden.In view The LAT/VERT flag is in view.TO-FROMSelection Verify That:FROM The FROM flag is in view.Hidden The TO/FROM flag is hidden.TO The TO flag is in view.SELECTED COURSESelect 150° on the CDI/HSI that is connected to the 500 Series unit’s MAIN OBS inputs. TheSELECTED COURSE field should indicate near to 150° and a Calibrate to 150°? field appears.Selecting this field calibrates the 500 Series unit to match the input source. Verify OBS operation bychecking that the course displayed on the 500 Series unit is within 2° of the selected course. Do this at 30°intervals around the OBS card.NOTEIf it is desired to ignore a selected course input (either analog resolver or ARINC 429) for GPS operation inOBS mode, press MENU on the MAIN CDI/OBS CONFIG page and select “Ignore SEL CRS or GPS?”.When OBS mode is selected, the selected course is entered on the controls of the 500 Series unit. Ifignoring the selected course input such that the VOR valid flag is dependent only on a valid VOR signal,with lateral deviation calculated by another display device, press MENU on the MAIN CDI/OBS CONFIGpage and select “Ignore SEL CRS for VLOC?”.Figure 5-9.MAIN CDI/OBS CONFIG Page