Copier copying can be adjusted back to 100% in the proportion option in the function. When we use the copier to make copies, due to a variety of requirements, we may be able to enlarge or reduce the proportion of the copy, this time are adjusted in the penpower option, using the plus and minus signs on top of the copier to enlarge and reduce. At the same time, it should be adjusted back to 100% after use, otherwise the back is also enlarged or reduced.