Achi IR6500 trouble

[Eleways]

Hi

I've bought a new Ir 6500 but i have this problem.

I used the same program of my old IR 6000. Bottom 280°, head a slow ramp till 245°. First time using IR6500 the BGA moved at 220°. Second try same. After this it's impossible to move the BGA.
With bottom at 350°, and the head till 250°, the bga don't move.
I've send back the IR 6500, the supplier send me another one....
Same problem. first job was ok, after second job the Bga don't move.

this is the program that i use about head:
r1 - 1.0
l1 - 80
D1- 60

R2 - 1.0
L2 - 125
D2 - 50

R3 - 1.0
L3 - 160
D3 - 60

R4 - 1.0
L4 - 185
D4 - 50

R5 - 1.5
L5 - 220
D5 - 60

R6 - 1.5
L6 - 245
D6 - 90

END
HB 500

Please help me!!

Thanks

Luca