Eco print is off, I checked if there was any difference on it. Eco print turned off has the same effect. Refreshing does nothing.
My vote for troubleshooting is on secondary transfer poor efficiency. check that the contact spring as well the contact pad at the rear of the door for debris and deformation.
The rear pad and spring gathers toner or other dust and will bleed current from HV causing low transfer efficiency.
try stopping the copier during a print, and look at the transfer belt exposed face, is the image dense, or faint? and does image remain on the belt after it has passed the secondary, and returning toward the left side of machine(top of belt)? Then the secondary transfer isn't good.
Finally, some solution. I will check and let you know. Thank you
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