Silver Crest Blender Sc-1589 Manual Link
The manual advises against dry grinding hard spices or coffee beans regularly, as this can dull the blades designed for wet blending. Short bursts (Pulse) for soft spices (cinnamon, cumin) are acceptable.
Here are some troubleshooting tips for the Silver Crest Blender SC-1589: silver crest blender sc-1589 manual