Question about HP LaserJet 4 plus Printer

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I rescued an old Laserjet 4 Plus from the basement of where I work. Turned on like a charm, sounds great, prints good( but needs new toner cartridge) I'm s however on every piece of paper coming out there's about a 2" wide light grey streak running down the right hand margin of each page.

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I too began to have vertical grey streaks on output from my trusty LaserJet 4 Plus. If I printed a page from text pad with just a single period on it the streaks were there, varying shades of gray in varying widths from 1/4 inch to 2 inches. I noticed the transfer roller was soiled in a way that matched the streaks and so was the green colored drum in the toner cartridge. I cleaned the toner cartridge and transfer roller and that completely solved the problem. 1. Cleaned transfer roller with old clean white dry t-shirt. Kept gently wiping toner off until it seemed pretty clean. Find info on web about how to remove the transfer roller in the service manual.
Get service manual by searching for LaserJet 4 on this web site:
(you have to download it in several parts as .rar files, put all the rar files in one folder and then open the first .rar file with a program like Power Archiver and it will add all the files together into one big PDF file of the service manual) 2. Cleaned the half of the toner cartridge that houses the green drum roller. I followed the steps in Part 1 on this web page: 2A. I removed the green drum and wiped that off with old cotton t-shirt then set it aside out of the light. 2B. I cleaned the little roller (PCR roller) mounted behind the green drum, inside the toner cartridge with a slightly damp piece of cotton t-shirt, rubbed gently for quite a while to get to the white underneath the old toner. Did not get all of the toner off. Did not submerse this roller, just used slightly damp cloth. 2C. Detached the piece of metal that keeps old toner trapped in a compartment and also gently wiped toner off the plastic blade on it that is called the wiper blade. 2D. I scooped out old toner and then vacuumed out the rest from behind the metal piece described in 2C. Reassembled and no more streaks, totally clean page output.

Posted on Mar 01, 2009

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There are several things that can cause this. A worn toner cartridge and/or transfer roller can cause vertical smears, but it may also be a worn fuser assembly. The teflon coating on the fixing (heat) roller wears off, and leaves vertical streaks of varying widths on the pages. Sometimes you may see "ghost" images on the pages for the same reason. Open the back door of the printer, and hold down the exit guide on the fuser (carefull, it may be very hot). There are two long rollers, the lower one is black, the upper roller is either grey or shiny brown. That's the teflon coating. See if it's peeled or damaged. If so, replace the fuser assembly.

Posted on Feb 17, 2007


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Here is the service manual: Click on this link or copy and paste the complete link into your browser.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

I’m happy to assist further over the phone at

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