1.Take out the related cartridge which need to replace chip.

2.Cleaning the cartridge and refill toner powder. Warning: the machine will
be destroyed when the toner powder is lower or without powder.
3.Put the new chip inside, please pay attention to the direction when take
out the old chip.
4.Please don't install the cartridge immediately, close the cover, turn on
the machine.
5.After the red light flash,the machine will show that no cartridge installed,
then put the cartridge into the machine.Warning:Please don't turn off the
electrical power on the process of installation.

If all new chips are installed when there a lack of toner it'll easily lead to the results below.                                                  

1).falling short of initial capacity

2).lack of printing pages