Di 7210 tests

[copycommerce]

We bought a few Di 5510 and one Di 7210.All seems fine with em just some small problems that we easy figured out.
We are concerned about a problem with the test modes of the Di 7210.
On test 9 and 7 it makes 2 big lighter lines and its only on thiese tests.The copy seems fine the print too.We think that mby there is some minor lack of charge but the charging corona seems fine too its only on 40k count.However the non conductors at the corona ain't changed(they are on 700k average).Does someone know for which things are the test 9 and 7?Soon i will scan the test and post em.

[fixthecopier]

I think I know what you are talking about. "Void streaks" or areas where the toner is light or does not print.
You will probably have to adjust your bias to improve it, but did you swap the charge grids between machines to see if that changes it?

[copycommerce]

After swaping the charge coronas (the whole corona not only the grid) the problem perished.I cleaned the isolators and now both coronas works fine Oo