Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
That error code of F2, in this Sharp copier model, means several things, depending upon the sub-code, which with F2, could be also
00 - Toner control sensor open
02 - Toner motor connector
31 - Process control abnormal
32 - Process control abnormal
37 - Drum marking sensor, gain adjustment error
39 - Process thermistor breakdown.
Is the copier getting hot inside?
Check the connector to the toner motor - is the connection or junction dirty with either toner or grease or other ? if so, with power Off of course, disconnect and clean it, re-connect firmly, try again.