HP 510 - Manual (Page 169)

Cancelling the drying time
CAUTION: Use caution when performing this procedure as an image that has had insufficient time to dry
could be damaged.
Use the following procedure to cancel the drying time for a job that is waiting for the end of drying time.
1. Press Cancel or Form Feed & Cut on the front panel.
The printer will release the paper and it will fall into the paper bin.
Cancel key
Form Feed & Cut key