Hp laserjet 1012 printing black pages

Sadly, the following HP support page offers about 8 dirrerent possible solutions, some of which you may have tried. You likely will have to try the others to see if they eliminate the problem.

Myself, I would download the HP Print and Scan Doctor just to see if it worked any magic or offered advice. Alternatively, Here is the support page related to printing issues with this printer: https://support.hp.com/us-en/document/c00599279

https://h30434.www3.hp.com/t5/LaserJet-Printing/A-Vertical-Strip-and-repeated-signs-on-Print-Outs/td-p/5668042

https://www.tonergiant.co.uk/blog/2017/05/black-lines-down-the-page-4-causes-and-how-to-fix/

ya solve this problem 
if you r change the cartridge 

in the software there should be an option to "clean heads"
if you click on it it will print a test page off.
it should work better.

Toner is your problem...defective cartridge.

Please rate me

I had a similar problem, it turned out to be a cheap toner cartridge. Replaced it with an HP cartridge and have had any problem since.

Hi ,
try the following link:
http://tinyurl.com/dyz9bj
or else here is the price list:
HP 12A (Q2612A) Compatible 2,200 Yield Black Toner Cartridge - HP LaserJet 1012, 1018, 1020, 1022, 1022N, 1022NW, 3050, M1319F 
Price: $24.99
Sale Price: $24.99 Quantity: 
3-PACK HP 12A (Q2612A) Compatible 2,200 Yield Black Toner Cartridge - HP LaserJet 1012, 1018, 1020, 1022, 1022N, 1022NW, 3050, 3052, 3055, M1319F 
Price: $62.99
Sale Price: $62.99 Quantity: 
HP 12A (Q2612A) OEM Original 2,000 Yield Black Toner Cartridge - HP LaserJet 1012, 1018, 1020, 1022, 1022N, 1022NW, 3050, 3052, 3055, M1319F
Sale Price: $72.99

I ran the hp toolbox "cleaning" mode too and it did not help the problem at all. I still have a dark smear concentrated in the middle of the page, and ghost images repeated lighter all the way down the page.

Try to change toner cartridge, I had this happen with my old laserjet 5, and it was a faulty cartridge on mine.

replace toner drum or replace cartridge

maybe the scan unit need to clean first you most sure that the toner cartridge is original and new then start clean th scan unit reflector