my tech hasn't followed up with me, but I did change the black drum with the included charge corotron and it helped. In the past I had one corotron that would give me good prints. I kept having to swap it out with the one that came with the "new" drum because the one that came with it produced poor results. Eventually the corotron started to stick and I couldn't use it any more.
It sounds like you are trying to say that it happens when printing and from the scanner glass. The best way to tell if this is inherent to DC250's is to have the tech try the file on another DC250. Try it on a newer DC252 or even a 550 to see if it still happens.
This has been going on for years. So, we've had about everything replaced over that course of time. (but not replaced because of this problem) We calibrate through workflow on a regular basis using the EFI-ES-1000 using a coated 11x17 stock with random patches, and re-ran the Auto Gradiation Adj. this morning which didn't fix it. I print out the same sheet to my $75 laser fax machine and it comes out great. I put that on the glass to copy, but the machine can't capture the image properly. Do you know of an internal test pattern I can print with tinted text?
Does the same problem occur if you use copying or/and internal printouts?
What have you done so far in terms of troubleshooting?
What about doing a Auto gradiation, have a look HERE.
Please remember to select "Accept as Solution" for posts that helped you solve the issue.
Is this a normal problem for the DC250? Tints, whether they're text or something else in lineart seem to start loosing fill at about 50%, and once you're down to 10-15% tint, there's nothing left but the outline. If I'm doing a stepped solid tint down a sheet, I can easilty still see a 2% dot, but if it's text it disappears at around 10%.
I've received no help over the past several years from technicians.