What are the reasons for text isn't obvious? How to deal with it?

What are the reasons for text isn't obvious? 

How to deal with it?

The reason:
The toner, magnetic roll developing voltage and carbon power is low, effect of photosensitive is poor .
The resolution is doesn't meet the printer requirement.
The printer has been working too long and it's tired.

Solution:
shake out the toner cartridges, if the printing effect is not improved, please replace the toner cartridges.
Test the resolution and meet the printer requirements.
Arrange the printing interval to restore the performance of the light-sensitive drum.
Clean the photoelectric components in the printer.

What are the reasons for the output of blank pages?

What are the reasons for the output of blank pages?

    （1）Toner seal film is not pulled out;

    （2）Not shake the toner in front of the film, causing the powder is not flow smoothly;

    （3）Toner mask or cover is not opened;

    （4）The sensitive drum is not well grounded, and the conductive or toner cartridges connected to the machine are not well connected.

What are the reasons for Toner cartridge Unstable？

What are the reasons for Toner cartridge Unstable？

（1）The indoor temperature is didn't reach best Operating temperature range of toner drum.

（2）paper is Damp; Toner is damp; 

（3）The printing medium is too thick or the surface is too smooth.

Why there have fuzzy stripe in the middle or edge of the page?

Why there have fuzzy stripe in the middle or edge of the page?

（1）Printing's environment is humid or high temperature; 

（2）The printer is placed skew, uneven or ink powder is inhomogeneity; 

（3）The window scanning of the printer isn't clean or Cartridges are damaged.