abort takeoff due to TAKEOFF CONFIGURATION WARNING

  TG 691 WITH HS-TDF .I ABORTED TAKEOFF AS SOON AS THE TAKEOFF WARNING SOUNDED. AFTER CHECKING CONFIGURATION, FOUND NO ANY MISTAKE ABOUT CONFIG. I SUSPECTED FAILURE AT SPEEDBRAKE MODULE. SO WE HAVE THE SAME PECULIAR EVENTS FROM BOTH TDG AND TDF. SO I SUGGEST BEFORE DEPARTURE ,CHECK YOUR SPEEDBRAKE LEVER AT FULL DOWN POSITION. YOU CAN CHECK IT BY TRYING SELECT REVERSER OUT OF IDLE, IF " SPEEDBRAKE NOT ARMED" AMBER LIGHT APPEAR, YOU CAN EXPECT NORMAL TAKEOFF WITHOUT TAKEOFF CONFIGURATION WARNING.BUT IF " SPEEDBRAKE ARMED" GREEN LIGHT SHOWED INSTEAD, PLEASE CALL LICENSED ENGINEER FOR CONSULTING THIS PHENOMENON. THANK YOU