Why Is My Laser Printer Making Dirty Pages?
Dirty pages from a laser printer, such as a gray haze, toner specks or spots, usually mean loose toner or paper dust inside the printer, a worn drum or toner cartridge, or paper and humidity problems. Print a cleaning page first. If spots repeat at the same gap, measure it: the distance tells you which part to replace.
By Printer Test Page LabLast updated
What kind of dirt is on your page?
| What you see | Usual cause | Try first |
|---|---|---|
| Gray background haze over the whole page | Worn toner or drum, damp or reused paper, very dry or humid air | Fresh paper, lower density, then a new cartridge |
| Random specks or dots | Loose toner or paper dust inside the printer | Print a cleaning page; wipe out loose toner |
| Spots that repeat at the same gap | A mark on the drum, toner cartridge, a roller or the fuser | Measure the gap (table below) |
| Smears on the edge that feeds in first | Dirty paper guides or debris in the paper path | Clean the paper path |
| Marks on the back of the page | Toner on internal rollers | Print a few blank pages |
| Lines down the page, or faint copies of earlier text | A streak or ghosting fault, not dirt | See laser printer lines and streaks |
Why do laser printers make dirty pages?
A laser printer puts toner on a charged drum, rolls it onto the paper and melts it on with a heated fuser. Anything that lets toner land where the drum didn’t intend shows up as dirt. Over time, paper, toner and dust build up inside the printer and cause specks, smears and repeating marks; HP’s LaserJet guides give that as the reason for their cleaning page.[1] Paper dust on the cartridge can cause a gray background or dark bands.[2] The room matters too: Brother says heat and humidity add background shading,[3] and Canon offers a Low Humidity Mode for toner that scatters in dry air.[4] And a cartridge can wear out before its gauge says it is empty.[5] That is why the usual order is: clean, check the paper and room, then replace parts.
What laser dirt looks like
Drawn examples, not scans of real prints. Compare them with your printout to pick the closest match.
Print a page that shows the dirt
The uniformity page is a flat gray field, so haze and specks stand out. The blank page has only rulers on it: anything else that prints is coming from inside the printer. The repeat-defect page has a scale for measuring the gap between spots.
Printed? How did it look?
- Scale: 100% or Actual size, not Fit to page
- Headers and footers: off
- Paper in the tray matches US Letter
What to look for: laser uniformity page
- Vertical light streaks in every field usually mean low toner or a dirty part along the paper path.
- Dark lines or specks that repeat down the page come from a roller. Measure the gap on the repeat-defect page.
What to look for: blank page
- The middle of the page should stay perfectly white.
- Gray haze, dots or lines in the empty area point to the drum, toner or rollers on a laser printer.
- Smudges or roller marks show dirty feed rollers or ink inside the printer.
What to look for: repeat-defect measuring page
- Find a mark that repeats down the page.
- Use the side scale to measure from one mark to the next, then enter the distance in the repeat-defect ruler.
What to look for: color laser repeat-defect set
- Look for marks that repeat down a page, and note which color page they are on.
- Measure the gap between repeats with the side scale and enter it in the repeat-defect ruler.
- A mark on every page points to a shared part such as the fuser or transfer belt; a mark on one page points to that color’s cartridge or drum.
Laser uniformity pageUS Letter · true size
Spots repeating down the page: measure the gap
A spot that comes back at the same distance is caused by something that turns: the drum, a roller in the cartridge, or the fuser. Measure from the top of one spot to the top of the next. HP’s method is to line up the zero of its repeat ruler with the first mark and read which part sits beside the next one.[6] The distances differ by model, so use the numbers for your printer only.
| Printer | Repeat distance: part |
|---|---|
| HP LaserJet P3010 series (P3015) | 38, 50 or 95 mm: print cartridge · 43.6 mm: print engine · 76 or 79 mm: fuser[7] |
| Brother HL-L5000D, L5100DN, L5200DW, L6200DW, L6250DW | 1.5 in.: toner cartridge · 3.7 in.: drum unit[8][9] |
| Brother HL-2140, HL-2150N, HL-2170W | 75 mm (2.95 in.): drum unit[10] |
| Lexmark MS521, MS621, B2546, B2650, M1246 | 97, 47 or 38 mm: imaging unit[11] |
| Lexmark MS331, MS431, MS439, B3340, B3442, M1342 | 96 or 37.7 mm: imaging unit · 43.5 or 37.5 mm: toner · 52 mm: transfer roller · 79.8 or 62.5 mm: fuser[12] |
Brother lasers with 94 mm drum marks, and other models with tables in their manuals, are in the repeat-defect ruler. Dots with no regular spacing usually mean loose toner inside the printer rather than a part, Brother says; wipe it out with a soft, dry, lint-free cloth.[13]
HP laser printer spots on paper
On LaserJet Pro M304 to M405 models, HP’s first step for specks, smears and repeating marks is a cleaning page: Setup, then Printer Maintenance, Print Quality Tools, Cleaning Page.[1] On the older M1130 and M1210, the cleaning page is in the driver and may need to run several times.[14] If spots stay, look at the green drum on the cartridge without touching it: scratches or fingerprints mean a new toner cartridge.[15] For a gray background, HP’s order is fresh paper, a different paper type, lower toner density, a check of temperature and humidity, then a new cartridge.[16] A mark at the same spot on every page of a P1560 or P1600 means a damaged cartridge.[17] Smears on the leading edge point to dirty media guides or debris in the paper path.[18]
Brother laser printer dirty pages
For a gray background on the HL-L2350DW family, Brother says to check the room, clean the drum, then replace the toner cartridge and finally the drum unit.[3] For toner specks, match the driver’s Media Type to the paper before cleaning the drum.[19] If you see lines rather than specks, the laser lines and streaks page covers corona wire and drum cleaning.
Canon imageCLASS dirty prints
Canon ties splattered toner on imageCLASS MF445dw to MF455dw models to unsuitable paper or low toner.[20] If the printed paper itself comes out dirty, run Clean Fixing Assembly from Menu, Adjustment/Maintenance, Maintenance, with plain paper loaded.[21] Black streaks along the leading edge can be reduced with the Special Processing option for wrinkles and streaks, at the cost of speed.[22] If only copies are dirty, clean the platen glass and the underside of the document feeder.[23]
Lexmark: print the quality test pages first
Lexmark’s guides start every print-quality fix with the Print Quality Test Pages, under Settings, Troubleshooting.[24] For mottled print and dots, it says to confirm a genuine toner cartridge, check for leaked toner, then replace the imaging unit if it is near the end of its life.[25] Repeat distances for two Lexmark families are in the table above.
Fixed? Print the uniformity page again
A clean gray field with no specks means the dirt is gone. If you now see streaks rather than spots, go to laser printer lines and streaks. If toner rubs off when you touch it, see printer smudging.
Questions people ask
Why is my laser printer printing dirty pages?
Usually because loose toner, paper dust or debris has built up inside the printer, or because the drum or toner cartridge is worn. Damp or unsuitable paper and very dry air can also make toner land where it shouldn’t. Print a cleaning page first, then check the cartridge and drum.
Why does my HP laser printer leave spots on paper?
HP’s LaserJet guides say paper, toner and dust build up inside the printer and cause specks and repeating marks, and the first fix is a cleaning page from the printer’s maintenance menu. If spots repeat at a fixed gap, measure it: on many models a repeating mark points to the toner cartridge.
How do I get rid of a gray background on laser prints?
Make sure the paper hasn’t already been through the printer, try a different paper or paper type setting, lower the print density, and check the room isn’t very dry or humid. If the haze stays, replace the toner cartridge, then the drum unit if your printer has a separate one.
Can I clean the drum myself?
On many Brother lasers, yes. Slide the green tab on the drum unit to clean the corona wire, then put the tab back to its home position. HP cartridges have the drum built in, so a scratched or marked drum means a new cartridge. Don’t touch the drum surface.
Sources
- [1] HP LaserJet Pro M304-M305, M404-M405 User Guide - Resolving print quality problems (HP)HP LaserJet Pro M304-M405 (same text in the M207-M212 guide): paper, toner and dust build up inside the printer and cause specks, spatter, smears, streaks, lines or repeating marks. HP's fix is to print a cleaning page (Setup > Printer Maintenance > Print Quality Tools > Cleaning Page on the M404).
- [2] User Guide HP LaserJet M207-M212 series - Improve print quality (HP)HP LaserJet M207-M212: paper dust on the cartridge causes grey background, vertical dark bands or repeating horizontal bands. Run Cartridge Cleaning Mode from the EWS (System > Service).
- [3] Improve the Print Quality (Online User's Guide HL-L2325DW/HL-L2350DW/HL-L2370DW/HL-L2370DWXL) (Brother)Brother HL-L2325DW/L2350DW/L2370DW, grey background: check the room (heat and humidity add background shading), clean the drum, then replace the toner cartridge, then the drum unit.
- [4] Printouts Are Dirty with Splattered Toner - Troubleshooting (FAQ) imageCLASS MF455dw / MF453dw / MF452dw / MF451dw (Canon)Same imageCLASS models: for dirtying in low humidity, set Menu > Adjustment/Maintenance > Adjust Image Quality > Special Processing > Low Humidity Mode (start with Mode 1). It can make print light or uneven in humid rooms.
- [5] Printouts Are Dirty with Splattered Toner - Troubleshooting (FAQ) imageCLASS MF455dw / MF453dw / MF452dw / MF451dw (Canon)Canon imageCLASS: a cartridge can reach end of life (and cause dirty prints) even if the gauge shows toner left, so replace it.
- [6] HP LaserJet Professional M1130/M1210 MFP Series User Guide - Solve image-quality problems (HP)HP repeat-defect method (M1130/M1210 guide): line up the ruler's zero with the first mark. The mark beside the next repeat names the part. If the match is the print engine or fuser, the printer may need service.
- [7] HP LaserJet P3010 Series Printers User Guide - Repetitive defects ruler (Figure 10-1) (HP)HP LaserJet P3010 series (P3015): the user guide's repeat ruler gives 38 mm, 50 mm and 95 mm = print cartridge; 43.6 mm = print engine; 76 mm and 79 mm = fuser. These numbers apply only to this series.
- [8] Dots or smudges on printed pages (HL-L5000D, HL-L5100DN, HL-L5200DW, HL-L5200DWT, HL-L6200DW, HL-L6200DWT, HL-L6250DW) (Brother USA Support)Brother HL-L5000D/L5100DN/L5200DW(T)/L6200DW(T)/L6250DW: dots every 1.5 in. (about 7-8 per page) mean replace the toner cartridge.
- [9] Dots or smudges on printed pages (HL-L5000D, HL-L5100DN, HL-L5200DW, HL-L5200DWT, HL-L6200DW, HL-L6200DWT, HL-L6250DW) (Brother USA Support)Same HL-L5000/L5100/L5200/L6200/L6250 article: dots every 3.7 in. (about 3-4 per page) point to the drum. Clean it first (corona wire, then 10 blank pages). If they remain, replace the drum.
- [10] Improving the print quality (HL-2140/HL-2150N/HL-2170W User's Guide) (Brother)Older Brother HL-2140/HL-2150N/HL-2170W: white or black spots repeating every 75 mm (2.95 in.) point to the drum (e.g. label glue on the OPC drum). Clean it, or fit a new drum if damaged. On these models the drum interval is 75 mm, not 94 mm.
- [11] B2546, B2650, M1246, MS521, MS621 Printers User's Guide - Print quality troubleshooting (Lexmark)Lexmark B2546/B2650/M1246/MS521/MS621: print the Print Quality Test Pages and measure the repeat. 97 mm, 47 mm or 38 mm means replace the imaging unit. Any other distance: note it and contact Lexmark support.
- [12] B3340, B3442, M1342, MS331, MS431, MS439 Printers User's Guide - Repeating defects (Lexmark)Lexmark B3340/B3442/M1342/MS331/MS431/MS439 repeat distances: imaging unit 96 mm or 37.7 mm; toner cartridge 43.5 mm or 37.5 mm; transfer roller 52 mm; fuser 79.8 mm or 62.5 mm. Transfer roller or fuser matches mean contact Lexmark support.
- [13] Dots or smudges on printed pages (HL-L5000D, HL-L5100DN, HL-L5200DW, HL-L5200DWT, HL-L6200DW, HL-L6200DWT, HL-L6250DW) (Brother USA Support)Same HL-L5000/L5100/L5200/L6200/L6250 article: dots with no regular spacing suggest loose toner inside the machine. Wipe it out with a soft, dry, lint-free cloth. A leaking cartridge must be replaced.
- [14] HP LaserJet Professional M1130/M1210 MFP Series User Guide - Solve image-quality problems (HP)HP LaserJet M1130/M1210: for toner specks or dots, run the driver's cleaning page (ideally on a transparency). It takes about 2 minutes and may need repeating several times.
- [15] HP LaserJet Pro M304-M305, M404-M405 User Guide - Resolving print quality problems (HP)HP LaserJet Pro M304-M405: take out the cartridge and look at the green imaging drum without touching it. Scratches, fingerprints or other damage mean replace the toner cartridge.
- [16] HP LaserJet Pro M304-M305, M404-M405 User Guide - Resolving print quality problems (HP)HP LaserJet Pro M304-M405, grey background or dark print: make sure the paper has not already been through the printer, try a different paper type, reprint, lower toner density (mono models), check temperature and humidity, then replace the cartridge.
- [17] HP LaserJet Professional P1560 and P1600 Printer series User Guide - Vertical repetitive defects (HP)HP LaserJet Professional P1560/P1600: a mark repeating at the same spot on each page means a damaged cartridge, so install a new one. Marks on the back of the page usually come from toner on internal parts and clear after a few pages.
- [18] HP LaserJet Professional M1130/M1210 MFP Series User Guide - Solve image-quality problems (HP)HP LaserJet M1130/M1210: smears on the leading edge mean dirty media guides or debris in the paper path, so clean them. Other causes are a defective cartridge or the wrong paper type (fuser too cool).
- [19] Toner specks (HL-L2350DW FAQ) (Brother)Brother HL-L2350DW, toner specks: match the driver's Media Type to the paper, clean the drum, then replace the toner cartridge or drum if damaged. The fuser may be contaminated, so contact Brother.
- [20] Printouts Are Dirty with Splattered Toner - Troubleshooting (FAQ) imageCLASS MF455dw / MF453dw / MF452dw / MF451dw (Canon)Canon imageCLASS MF445dw/MF448dw/MF449dw/MF451dw-MF455dw/MF543dw: dirty pages with splattered toner usually mean unsuitable paper or low toner. Use supported paper, try Low Humidity Mode in dry rooms, and check or replace the cartridge.
- [21] Streaks (Lines)/Uneven Printing Appears in Printouts - Troubleshooting (FAQ) imageCLASS MF455dw / MF453dw / MF452dw / MF451dw (Canon)Canon imageCLASS (MF445dw-MF455dw, MF543dw, MF641Cw-MF656Cdw): a dirty fixing assembly makes printed paper dirty. Run Menu > Adjustment/Maintenance > Maintenance > Clean Fixing Assembly with plain A4/Letter loaded.
- [22] Streaks (Lines)/Uneven Printing Appears in Printouts - Troubleshooting (FAQ) imageCLASS MF455dw / MF453dw / MF452dw / MF451dw (Canon)Canon imageCLASS MF445dw-MF455dw/MF543dw: black streaks at the leading edge with halftone images (or wrinkles from damp paper) can be reduced with Special Processing > Rdc. Wrinkles(Humidity)/Streaks > On. This slows printing.
- [23] Streaks (Lines)/Uneven Printing Appears in Printouts - Troubleshooting (FAQ) imageCLASS MF455dw / MF453dw / MF452dw / MF451dw (Canon)Canon imageCLASS MFPs: marks on copies can come from a dirty platen glass or feeder underside. Power off, then wipe with a damp, well-wrung cloth followed by a dry one.
- [24] B2546, B2650, M1246, MS521, MS621 Printers User's Guide - Print quality troubleshooting (Lexmark)Lexmark MS521-family guide: before troubleshooting any print defect, print the Print Quality Test Pages (Settings > Troubleshooting > Print Quality Test Pages).
- [25] B2546, B2650, M1246, MS521, MS621 Printers User's Guide - Print quality troubleshooting (Lexmark)Lexmark MS521 family, mottled print and dots: confirm a genuine, supported toner cartridge, check for leaked toner (replace the cartridge if it leaked), then replace the imaging unit if it is near end of life.
Checked 2026-10-13. Repeat distances apply only to the models named next to them.