Try cleaning the sub scan encoder, thats the rotary clear mylar disk on the front end of the print unit. Use metho then wipe it down then clean it with a dry soft cloth as even the stain left by evaporating methalated spirits will upset the opto sensor that counts all those little bars on the disk. If that dosnt work you may be in for a new print engine that costs about 75% of a new copier.
Do the right thing and try to get he customer to upgrade to MP C2000, its a real copier and works!
