Customer purchased drum unit and starter but not dv unit. Installed items and copier worked fine for a few months but then got the 2557 code.
Replaced the drum unit and dv unit and starter as a set and ran F8. Copier worked fine for a couple of days, then coded c2557 again.
Adjusted ATDC gain from 172 to 182 and machine started working again. Printed over a ream of paper with no issues.
Then checked
ATDC set 182
ATDC Current 7.5%
Vg Current -640v
Vb Current -540v
If code returns maybe it’s an issue with the machine not adding enough toner. No mylar blocking toner hole in hopper an everthing looks lined up correctly. At least it’s working for now and got through an entire ream. Comments appreciated.
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