Ricoh 7500 has ghosting when printing and copying. How to solve it?

Check the drum core and fixing film on the toner cartridge.

You check the charging roller,

1) The charging roller is not clean or damaged;

A. black spots appear repeatedly at regular intervals.

B. vertical stripes appear on the test page.

C. shadows appear on the whole page.

D. ghosts.

If the black spots on the printed white paper can be removed by hand, it is the same problem as ghosting-the fixing stick is too dirty; If it can't be fastened by hand, then check the developing part, whether the black stripes are vertical or horizontal, the horizontal stripes are generally sheets, and the vertical ones are generally main charges. Please check the above aspects carefully.