Printing problems Laser printer is leaving unprinted stripe down side of page?

replace the transfer belt? and or color image units


try this site for parts as a start

Precision Roller Printer Toner Cartridges Parts and Supplies Office...

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Check the printhead pressure. there is an adjustment screw that does this. It could also be that your platen roller is worn or that your printhead has burned out pixels.

If you open up the lid, look for the four led heads, clead them with a dry soft cloth. If problem persists look at the black drum to see if theres any clue there.

please check transfer roller and clean it

could be the drum causing the issue or the scanner assembly.

Resolving white, light lines or streaks (eliminate light stripes)

From the printer, print the Troubleshooting Print Quality Pages.
With Troubleshooting highlighted, press the OK button.
Scroll to Print Quality Problems by pressing the Up or Down Arrow button. Press OK.

Scroll to Troubleshooting Print Quality Page. Press OK.
Evaluate the Light Stripes Test page for missing printhead jets (missing cyan, magenta, yellow or black color bars).

Clean the maintenance unit's wiper blade and empty the waste tray. A dirty maintenance drawer wiper blade can cause white lines and weak or missing printhead jets. Using a clean lint-free cloth or a paper coffee filter, gently clean the blade with a wiping motion across the entire length of the wiper blade.

1) clean LED heads with Alcohol swab.
2) Check fuser rollers for dirt, smudges. Clean with swab.
3) Remove all toners/drums and check for spilled toner. Vacuum or wipe clean.
4) Check tansfer belt for marks, stray toner, creases.
4) Re-seat toner and drum cartridges.

It sould be the print heads have gone bad.
I just had a Dell color laser that would print a 1" wide yellow line down the right side of the paper.
Replaced the print head unit, and problem solved.

Shake the toner cartridge left to right, then try.