At the Lower Dimming Panels, to the F/O side, is located the pushbutton SYS TEST. By pressing this button, several tests are carried out. Provisionally one can hear the different ON Warnings as a test.

How this switch can interface with the Pokeyskaart and ProSim737 you can read on page
PC Setup/Interface/Interface ON the Sys Test.

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Translated by Yandex.Translate and Global Translator