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Problem solved!!! thx all for ur help.
i change the drum unit and the yellow think lines and the scratches on drum gone..
then i clean the area below dev unit and the other thin lines gone!!!

...

Yes ,also i initial drum rotation to apply powder

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

i replace only drum not drum unit ..i havent change the whole unit.

i have the drum in front of me ..i can see the screws that hold the blade ..there is no red heading screw ,only vlack and silver

what red screws?

i have replace the the yellow blade 3 times same result the thing is like i said i can see this lines on print even before the drum show scratches...

i replace drum with blade always i tried both oem and long life drums same result lines start at 1st print ,scratches after 200 pages.
i cant wipe them i tried its permanent.

this screw is on the slot of corona on in drum unit?
this problem start before i replace anything on the machine

Well... i thought that too but i replace them and still got the same result

Hello , thanks for the fast answer here is new pics..

C6501 - Album on Imgur


let me know if u can see pics

Hello , i got a c6501 and i have 2 problems:
1) i got yellow lines in the background on the left side of paper only and few vertical lines all over the paper no matter what i print
2)drum got...

Hello, i have the same problem i have replace 3 drum and from the 1st print u can see a vertical line on the paper...after 200 copy u can see the scratches on drum also .. any1 got any suggestion?tnx

Hello,daren i have the same problems but i cant find the firmware can u give a link or email me plz ?