Change developer and toner ,because that is the only thing touching drum ,also check telloe transfer rolller in ibt section
DU102 drums only.
do not use DU104.
make sure your removing the red screws from the drums when replacing.
what is meter/life of DV unit? DV?
You really should have someone look at that machine that knows what there doing.
The red headed screws are at either end of the drum unit to keep the dcb blade of the drum while in transport.
UPDATE:
i replace the drum unit (i removed the red screws) the big think yellow toner lines fixed but still i got this line in the same spot
Drum lines - Album on Imgur
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