Is there a clutch?

I've had this bench drill for about 8 years. and it has wored well until now. Today I get a problem where as I am using it (with a drum sander in the chuck) the motoe continues to spin, but the chuck does not turn, and the displayed speed drops to 0. I am sanding with a light touch, so I am not putting much load onto the mechanism. Since I am visually impaired I am not keen to strip down this machine if it cn be avoided.