I changed the toner on my printer as the printed text was becoming progressively fainter. This was after the usual removing and shaking of the toner to get as much out of it as possible. On printing with the new toner we are still having the same problem with faint text, though this time continued shaking has not improved the problem!
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Try to clean the optical parts of your copier( scanner,mirrors,laser) and then repeat dev. adjust simulation.
PS: Please specify what type of copier you have. I can help you more than that.
This is a very common problem with the Samsung CLP 300 and CLX 3160 printers. What happens is that the toner or developer blades become coated with toner. The developer blades meter the amount of toner that the printer uses to make the image on the paper. When the blade become blocked, the image become faint. To fix this problem, you and either replace the imaging unit for about $100 or you can clean the blades yourself. I have posted instructions how to clean them on my Tips section.
This sounds like the doctor blade within the black developer unit inside the image unit has become contaminated. This means that not enough black toner will be attracted to the developer roller. This usually manifests itself as feint thin lines of print running vertically through the text being printed. This can be repaired and is a known issue with this image unit.
If the printer is in warranty tell them you want it replaced, if not then take the image unit back to the supplier you bought it from and demand a replacement.
The way to identifiy your problem is to send a full colour print to your printer and open the top just as the paper starts to come out . if you then remove your toner / drums for all the colours you can see the transfer belt if the quality of the image that you can see on the transfer belt is good and clear your problem is with the transfer form the tranferbelt to the paper and not any toner /drum issue and the most likley cause is the transfer belt itself "but before you relpace it remove it and clean around the electrical contact points and generally make sure the internals of the printer is free of loose toner .
more important than all that nonsense is:
is it faint when you do an internal report or make a copy?
if only on copies it is the film on the underside of the glass.
if on prints and copies it is the drum.