Printing density is low

Printing is faint.
If the printing is faint, check the following.
1. Check printing surface of TPH. (When the overall printing is faint or only one side is faint.)
1-1. Foreign substance on TPH could make the printing faint.
1-2. Check and clean the printing surface with Cleaning Pen.
1-3. If the printing quality does not change after cleaning, check the following.
2. Check the paper (When the overall printing is faint)
2-1. Printing quality very much depends on the quality of the paper.
2-2. Check the printing quality using highly sensitive paper.
3. Adjusting printing density
3-1. All types of thermal printers have functions to adjust printing density.
3-2. You can check the printing density settings by checking the settings of Dip S/W with User Manual, and adjust the density accordingly.
3-3. If you make the printing density too high, it could reduce the lifespan of TPH.
4. When one side is faint or white lines are produced
4-1. Clean the printing surface as described in step 1 shown above.
4-2. If one side is extremely faint or white lines are produced, contact the service center as the problem could be mechanical deformation or troubles in TPH or main board.