c350 with P31 code.

[tarzak911]

hi replace sensors in the balck transport drive and change m board.i have also tried another machines mfb and complete set of boards.
during sensor check sensors are ok but the P31 CODE STILL COMES BACK.PLS HELP...

[mo0651]

check your transfer belt. look it over very closely. the home position is not being detected and some piece of reflector may have fallen off. I just replaced a belt that had cracked and tore.