You'll have to reset the toner count also to zero...to do this,download the firmware here http://org.downloadcenter.samsung.com/downloadfile/ContentsFile.aspx?CDSite=in&CttFileID=2238869&CDCttType=FM&ModelType=N&ModelName=ML-1640&VPath=FM/200904/20090416100856890/ML-1640_V1.01.00.83.exe run it and it will reset your toner count to 0...you have to do this everytime you refill your toner.
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You'll have to reset the toner count also to zero...to do this,download the firmware here http://org.downloadcenter.samsung.com/downloadfile/ContentsFile.aspx?CDSite=in&CttFileID=2238869&CDCttType=FM&ModelType=N&ModelName=ML-1640&VPath=FM/200904/20090416100856890/ML-1640_V1.01.00.83.exe
run it and it will reset your toner count to 0...you have to do this everytime you refill your toner.