I suggest you do the following.
1. Start the copy and let feed paper to travel half way through
2. Open unit the whole machine will stop.
3. Check to see if any image is on the drum.
4. No image 2 reasons.
a: No charge on drum
b: No toner or toner not charged
5. Image on drum but not on paper then paper is not being charged.
On the copiers there are 2 charging wire
1. Charge drum
2. Charge Paper
Roger, June 2012