Have you cleaned the slit-glass located behind the drum? Its a thin piece of glass that is about the length of a drum assembly. Check that the drum voltages on the drum label have been correctly installed. Perform a AVPC in service mode to set the primary charge value.
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Check your drum. if drum is ok clean the laser unit and clean the drum unit and chraging roller.
And clean the laser scanner lamp and the Mirror.
You must alert while cleaning the mirrors(Reflectors) don't use thinner, alcohol and stain removers for cleaning scanner lamp and mirror don't do that to movements the reflectors just open the copy board glass and clean with a cotton.
Does this happen when you print!! Not copy. If it does when you print might check the transfer roller and or transfer & sep assemble across from the drum. If printing is OK then clean the glass on/inside the doc feeder you will see it follow the paper thur the doc feeder
Remove the old drum unit,remove the drum and the drum cleaning blade,clean the charge corona wire and grid,install the new drum and drum cleaning blade,clean the image transfer /separator corona wire,clean the optical parts(mirrors ,lens,glass)clean the AIDC sensoe located under OPC drum,reinstall the drum unit in the copier,enter in the technical Rep mode,place 5 sheets A3 paper on the original glass and perform F5 AIDC sensor(Auto image density control).
After replace the photocopier drum you need perform the F5 Auto Image Density Control.Enter in the service mode:press Stop key - 0 - 0 -Stop key - 0 - 1 and press 1.In the LCD appear E and press 5 and the copy(start) button for perform the F5.Begining place A3 sheet paper in the original glass.To replace the OPC drum clean the optical section(glass,mirrors,lens,sensors) and change the OPC drum cleaning blade.Clean the quenqing lamp and erasure lamp amd the transfer/separator corona unit(holders,wires) and the charge corona unit.
Is the machine a digital machine? If so there is a slight chance that the reason for the problem is that the mirrors are dirty under the copy glass. Remove glass and using glass cleaner on a soft cloth clean mirrors. Do not remove mirrors........
Clean copy glass and replace. If problem still there poss developer change or drum unit but most common is optic section. Also clean a **** glass in the machine. Open the door and you will notice a glass rod sticking out just above the drum unit. Remove clean and reinstall.
Is it only when you use the top feeder? Check by placing an original on the glass and copying if the same fault then there are three possibilities
Optics Dirty (Dust on the copying mirrors) Remove glass and clean the mirrors on the scan unit also remove the lens cover and clean the mirrors under there replace lens cover clean glass and refit. (Do Not remove any mirrors you can clean them in there place and use a glass cleaning solution)
Toner Waste and drum cleaning unit full. Open front cover and split machine as to remove jam not touching the drum (Large Cylinder ) check there is no banding on there. IF so to the left of drum there is a unit that contains the cleaning blade and fills with waste toner remove vacuum out waste toner check that cleaning blade ok and reinstall. Close and check machine if ok then great if not could be fault number 3 or that the cleaning blade is worn and need replacing.
The fuser section (Heat section) While the machine is split look at the bottom left you will see a Orange unit this is the fuser section that houses the heat roller which welds the toner to the page. Check that the top roller is OK that there is no toner stuck on it and the Teflon coating is even. If not then the fuser will need replacing and as you said that you are missing text the most likely faults are going to be the fuser or the drum or the drum cleaning blade.