How can I test if S7 DVB-S2 usb card terratec is functional working with last nightly AZ6027 tvheadend dvb-usb-az6027-03.fw

With my Tinkerboard Asus i will build a tv-ip server with 4 dvb-s2 ports. I use 4 usb cards from terratec. Modell S7. Driver and firmware seems to be loaded correctly. TVheadend also with last version recognizes the S7 card. but scanning the muxes of 19,2 E Astra failed. Now - i am surching for the solution. where is the failure? OS or tvheadend addon? Please - who can give help? Boxes are REV 2, or 3 - not 4.