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If you 'replaced' or refitted the original cartridge, then I would suggest that the toner cartridge has failed. If this is the case, please try a new one.
If the original has not done a fair (check manufacturers specification) number of prints, you may be able to ask for a replacement.
If this was a new cartridge, and printer uses separate drums and toner cartridges. Then it could be a faulty drum. Above replacement path could be tried.
Check the toner supply, it may be running out of toner. Check the bottle or cartridge for correct install. Turn the machine on and let it warm up, Recheck the copy quality. If it is still light run a dozen blank copies, then a test copy if it is improving the toner is depleted and need to catch up, if it isn't there may be a problem with the toner add system.
the problem in your machine is on the drum unit there is a arching on the mc unit.located in the upper portion of the drum unit.if you have an old drum unit try to install it again just for testing.and check if ther is a dumping toner again.
Your unit definetly needs a new drum. The usual yield for this consumable is upt ot 15,000 pages, so at the stated rate, the unit yielded more than average. AL-1000 series share the same toner and drum, so finding remanufactured (or recycled) drum units should be no problem. In Puerto Rico, they are sold for about $79.00.
Several things can cause this problem;
The drum cartridge is not being cleaned properly or there is a problem with the toner cartridge .
Take out the drum cartridge and inspect it for any signs of the defective image.
If that doesnot solve the problem, then Call a tech.