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Light streaks on paper with Ricoh cp431dn

Prints a light streak down the one side of the paper. How can I fix this?

Posted by Anonymous on


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Posted on Jan 02, 2017

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SOURCE: Color Streaks down length of page

This is a laser printer, neither a copier nor a multifunction unit, therefore it has no glass. At least, I cannot find any glass in it.
I finally had an authorized Ricoh repair center examine it and found streaks on the black unit that pulls out of the right side (I forget the part's name, <$90). We replaced it and things are better but streaks of color remain. They suggested replacing the color one (about $400) but the cost is prohibitive right now, so I'll live with those streaks.
On a related note, I remain unimpressed with this printer's quality and inconsistency. For example, greys often print in pink; nothing has ever resolved this. I refuse to put any more money into it. When I can afford to do so, it will be replaced, probably by a Xerox Phaser.

Posted on Feb 28, 2008

  • 3 Answers


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

  • 9 Answers


I will try to explain what is happening here. Basically, the PCU's are what puts the toner to the paper. As the parts spin, if there is clumped up toner in there, you will get the "light" streaks on your print out and the streaks will run the entire length of the page for that 1 color (or black). If this is your problem, then here is what I do.

This is messy, get a plastic bag - preferable something you can see through.

Get a feel for where the opening slider is on the top of the PCU and slide it open and hold it open in the bag.

Turn the PCU upside down and shake out all of the loose toner, you will have to turn the unit "to and fro" while shaking and banging it lightly.

Sometimes this will free up the clump of toner that is built up in between the sides of the toner trap and the roller. There's 1 roller that is constantly "dipped" in toner and the other roller that pulls the toner that is needed off of the "dipped" roller to apply to the paper. The one that is "dipped" is having the toner rubbed off by a clump of toner prior to getting to the other roller therefore only transferring a reduced amount of toner where the buildup is.

I have also on the Black PCU have removed the top 2 screws, taken off the green end cap (watch for the 2 plastic plugs that will fall), flicked the spring clips off of both ends and removed the 1 gear to pull out the roller assembly inside the PCU and used a high pressure blower (or canned air) to clean out any clumps. I don't recommend this to anyone that is not mechanically inclined. You can try to blow out the unit through the small slider opening on the top, but you may not get to the part where the streak is.

Good luck. Be sure to rate this post if it helps.

Posted on Apr 06, 2009

  • 2 Answers

SOURCE: clp-500. toner streaking the paper.

I have the same streaks problem. Any solutions?

Posted on Dec 02, 2009

  • 94 Answers

SOURCE: Printer streaks on card stock

adjust your thickness guage as card stock is 3 or 4 times thicker than a 20lb plain paper stock. Here is link to a helpful media guide for HP printers.

Posted on Jan 30, 2010

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