Please Help Tajima TEHX-C1215 Rotary Hook Timing

Hello,
I am hoping someone can help me with my problem.
I have Tajima TEHX-C1215 one of the heads hit the hoop and broke the reciprocator. I change it and try to time the rotary hook. The heads works fine but for some reason the thread sensor keeps giving false stop after 10 stitches. If I turn off the thread sensor the head sew fine.

I know how to time the older Tajima’s, but we just got this machine and I can’t fix it.

I know the thread sensors are working on it and I know I am doing something wrong.

Can someone please shade some light on what I am doing wrong.

I am surprised there is no videos on the internet of how to do time a rotary hook for TEHX-C machine :(

Thank you in advance for your help
Happy Holidays