Re: office jet pro 8600 black streak have unplug and cleaned still have black line when make copy

Hi,

Be sure to connect the printer to a direct power source without using any power splitter, surge protector, etc. and check for any difference.

As well install the latest firmware for your pritner and check if that may help:

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c02919168&cc=us&dlc=en&lc=en&product=4323659&tmp_track_link=ot_search

Shlomi