Light gray vertical lines appear on left side of printed pages. These lines cause the text to appear light gray to white where the lines fall over the text and appear light gray when the lines appear over the white paper. The printer is a Ricoh Aficio Cl3000e color laser printer.
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Vertical streaks are usually caused by a bad fuser. The fuser roller has a teflon caoting and when this coating gets scratched or worn it causes image defect to appear on the paper. The fuser for the 4250 is part number RM1-1082 and you can get them from Amazon.com or other online sites. Here is a link to an article that shows how the fusers can cause the vertical image defects like you have.
Would be helpful to know the brand and model of the printer. Sometimes this is caused by not returning the slide used to clean the primary corona wire to its original position (usually to the extreme left side of the toner cartridge) after cleaning the corona wire. If you haven't cleaned the corona wire, you should follow instructions and do that first.
Does this happen both when copying and printing? For printing solution, try another toner cartridge. If lines continue to appear when copying (primarily through the automatic feeder) then lift the auto feeder, and clean the glass -mainly the narrow piece on the left side.
depending on what the lines look like it could be the charge roller or transfer roller.
A defect on the charge roll appears as black areas on the front of the test page, and as light gray areas on the test page.
A defect on the PC drum of the toner cartridge appears as white areas on a dark, full–coverage test print and as black areas on the "text only" test page.
I have also seen a line with a 'ridge' on the paper. This will appear almost like an embossed line. This was caused by the fuser roller being scored by debris.
I believe there are 3 possible causes for this issue; toner drum, fuser or transfer roller - more than likely I would dismantle the printer and check for lines on the fuser. But just in case remove the toner and carefully release the flap to reveal the toner drum - if that is scored and the lines correspond to those on the print-out thats the cause.
If the problem only occurs when using the document feeder, the problem is not usually caused by the drum. When using the document feeder, try to notice where the scanner (the light assembly under your scan glass)stops just before the paper is being fed. Some multifunction machines have a small piece of glass that is separate from the large scan glass and the scanner assembly stays parked underneith it as the original is being fed over it. Most likely there is something on the glass where the scanner parks as originals are being fed thru the feeder. When putting your original on the large scan glass to copy, the mark on the glass will only show as a spot, but will show as a vertical line thru the whole copy when using the feeder.