Pantum M7102DN - How to Check the Drum Units Serial Number Location; Why the Printout Is Not Clearly and a Little Whitish in the Printing

14. How to check the drum unit’s serial number location:
Please check with below pictures:
15. Why the printout is not clearly and a little whitish in the printing?
Take out the cartridge, hold the handle of the cartridge and gently shake around 5 to 6 times, so as to make
the toner evenly distributed inside the cartridge.