Faded vertical white lines on the left side of paper when printing my with my Laser Printer.

[DecafOats]

Product Name: HP Color Laserjet Pro MFP M177FW

Product Number: CZ165A

I've had this printer for 2 years and I've never printed in large bulks. For the past 6 months I've used this printer sparsely and one day I've noticed faded vertical white lines on the left side of the margin. To be clear, it is not streaks as in ink marks of any color nor black. It is simply lines going from top to bottom where there is no ink printed at all. The faded lines aren't crisp sharp lines but instead fuzzy on the edges. 

I've searched online for solutions and the first thing I did was replace the Ink cartridges, which did not do anything. Second, I pulled out the drum and gave it a wipe with a microfiber cloth. Unfortunately it did not work as well.

I am posting on the HP Forums hoping someone out there could provide me a solution. Thank you for any input or suggestions.  

Left margin have lines of faded ink

[Alex-TATS]

Hi DecafOats,

It looks like something is blocking the laser glass. There might be just spilled toner on it, dirt or a small bit stuck there. Check the shutters as well. Especially that area of the laser glass where the paper is getting faded.

I hope this may help,

Cheers!

[DecafOats]

Hey Alex, 

Thank you for your response, I do appreciate it. Would you mind telling me where the laser glass and shutters are located in the printer? I tried to google but nothing useful is coming up. 

[Alex-TATS]

You will better need a Service Repair Manual for your printer model. Unfortunatelly, I am not allowed to provide you with one, as this is restricted information to qualified service engineers only.