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Usually when it prints light on one side and normal on the other, it's either the drum (which you replaced) a dirty corona wire, or the toner is unevenly distributed in the cartridge. You can removed the toner cartridge and gently drop it from a distance of about 4-5 inches to dislodge any caked up toner. This is normal in a cartridge that has sat a while or if the fax machine is in a room with high humidity. Hope this answers your question and best of luck. Greg
The toner has a fuse in it. When you replace the toner the fuse blows and resets the toner counter/light. Sometimes it blows and fails to reset. If you can solider you can replace the fuse and try again. Otherwise you will have to exchange the toner cartridge for a new one.
I have a feeling that it is a re-manufactured or compatible cartridge?? There is a fuse that needs to be replaced on this unit. it blows when the cartridge is installed to reset the machine. If the fuse has not been replaced or is defective the machine will not recognize the new unit.
make sure you pulled the seal out before you replaced toner,if you did not,do so.if you did i need to know if you purchased oem or generic replacement cartridge. check package instrutions on how to remove seal,or to see if cartridge even has seal.