km-3650w (wide format) poor copy quality

[solution23]

First thing I did was add the screw. Did not fix it. Noticed that there is a bit of variation of the background if I change the voltage on the charger. The only thing I have not tried is the grid so I have ordered a new one today and will try. Will let you know if successful or not

[alex2107_359]

Hello. As the problem was solved with a background. I also can't solve. All resource details are replaced.