99% of the time, this is the imaging drum or fuser.
Pull the imaging unit (same as imaging drum - they are interchangable) and examine the greenish glass tube. Does it have black streaks along the same lines that are on the paper? If so, then it needs cleaning / replacing. Don't touch the glass!! Use Q-tips and rubbing alcohol to gently clean the lines off. Air dry and replace into the machine.
If the imaging unit doesn't have lines, then it's the fuser. This can be replaced as part of a maintenance kit. If you've been using the printer regularly for more than 9-12 months, It's probably time for a Maintenance Kit for the machine anyway, which includes a fuser. I recommend Parts Now (http://www.partsnow.com/) for replacement kits, which have instructions on how to install with them.
I'd would put this fault down to the ITB ( image transfer Belt ) that sits at the front of the printer in front of the toner cartridges.This will wear with use and start to exhibit lines on the belt which can then transfer toner to the page
You have to change photodeveloper.
SOURCE: HP Laserjet IIIP starting printing thin vertical black line
Was this happening before you swapped toner?
Is there toner streaks on the drum? Yes? Defective.
What if you stop the printer (open cover) as it passes through the fuser to determine if image is from drum or fuser?
But really....isn't it time to move on anyway???
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