59.30 error, generally we recommend you try reseating the transfer belt assembly a couple times, also try reseating the toner and the fuser assembly.
If you have spares of any of these parts you can install them to help eliminate culprits. The problem can be a failing Transfer Belt Assembly.
There is also a Fuser Drive Assembly mechanism which can fail, which turns a flag on your transfer belt assembly. HPP3015报错59.30是什么原因