c-4520 bh c6501 cyan not full print appear

[rangertech]

Hi all,
Error code c-4520 in my bh c6501, and i look at the output print with test mode 58 (3 color cyan, magenta n black) cyan have a problem but for another color its good. Look like my attachment file. . . I has been to change drum,charging,1st tranfer roll,write unit, hv detecting cyan, but print cyan still not good
anybody help me. . .

[Albonline]

looks like either drum or developer sleeve is damaged

[inutelkamo]

check drum or drum sleeve..
Check the maylar, it may scrape developer in the developing unit.

Clean color registration sensor..

4520 points hand in color registration sensor.

[ni311]

Color registration error appears that because cyan it is not written properly on the belt. The issue is why it is not written properly. Check the drum if the image is ok and then check the belt, if the image is transferred properly.