On the Synchro Valid input R1 and R2 must be installed or the EX500/600 will sustain damage. If the unit is receiving HDG data, but the HDG is jumping all over the place check: 400Hz output of the A/C supply Check reference Hi and Low compared to X,Y,Z inputs. The reference and signal input wave-forms must be iden…
The snippet below is taken from the pilot guide, with some added explanation at the bottom. "Pressing the knob cycles through the various map views. The map view selected is indicated at the top of the map next to the heading box. No indication means Heading Up. All other options are labeled next to that heading…