remove drum and swop with magenta and test to cancel out drum.can be dev aswell.so if you really want to test dev you can swop magenta and bk.1 skrew and clip.then it will fit..just put tape over inlet of toner..so bk wont mix with magenta.run 1 page of test again.instead of bk magenta will be there.if prob is still there then you have just cancelled out the dev unit.and if you already swoped magenta and bk drums and 1 page and is still there you have cancelled out drum and dev.then you must start looking at charge.
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