K8005 T7 & T8 get v.hot

I’ve successfully driven the supplied stepper motor using K8005. Now I want to drive a better motor (Size 11 mini hybrid from Astrosyn). It is a six wire motor rated at 0.95A phase current. I’ve connected it as shown in on page 12 of the manual. Switched the supply on and noticed a burning smell. I think T7 and/or T8 is getting very hot.

Any suggestions?

Regards,

Kris.