Laser doesn´t turn ON

Hey  there,

I  downloaded and flashed the Arduino  MEGA 2560 R3 via Arduino IDE. I don´t changed something on  the cpu-map.h and observed with the osciloscope that I there is no output on  D6 or D7. nothing.

GCODE signal were:

M3 S500
G1 X200 Y200 Z0 F1000

Any idea?
Thx
Wolfgang