C280 C360

i have weird one well 2. the fault on the original c280 was it had lost the K prints , when printing in colour m colors all fine just no black! i replaced K drum K dev unit ITB and toner hopper units as level reading was really low. All this fault still there so i replaced the machine with a working C360 from our office it has been on site for around a week and now the same fault has occurred ,but only intermittently at present

any Ideas?:confused::confused::confused:

I have attached images from both prints and copys

Attached Files

• SKMBT_C36014032516010JM.pdf (234.9 KB)