Printer type
Laser printer problems and care
How laser printers fuse toner to paper, where they beat inkjets, what wears out (drum, fuser, rollers) and the care that keeps pages clean and sharp.
How they work
A laser printer gives a light-sensitive drum an even electrical charge, then a laser or a row of LEDs writes the page onto it by discharging tiny spots. Dry, powdery toner sticks only to those spots, the drum rolls the image onto the paper, and a fuser of heated rollers melts the toner into the fibres. That’s why pages come out warm, and why the print is dry the moment it leaves the printer.
The consumables are more than toner. Some printers build the drum into each toner cartridge; others use a separate drum unit that lasts through several cartridges. The fuser, the transfer belt on colour models and the paper rollers are wear parts with long but finite lives, and many printers count pages and warn you as each one nears the end.
Good for
- High volumes of text and black-and-white documents
- Low running cost per page, especially on mono models
- Printers that sit idle for weeks, since toner doesn’t dry out
- Sharp text that won’t smear if it gets wet
- Fast multi-page and double-sided jobs
Watch out for
- Colour models cost more to buy and are weaker at photos
- Inkjet glossy paper and non-laser labels can melt in the fuser
- Drum, fuser and roller replacements add to long-term costs
- Loose toner is a fine powder that spreads easily
- Higher power draw while warming up and printing
Care schedule
| How often | What to do |
|---|---|
| Every toner change | Remove every seal, tab and protective cover from the new cartridge before fitting it. If its instructions say to, rock it gently from side to side first to spread the toner evenly. |
| Every month | Switch the printer off, unplug it and let it cool for 30 minutes, since the fuser runs hot. Then wipe the paper pickup rollers with a lint-free cloth lightly dampened with water; dusty, glazed rollers are the main cause of misfeeds. |
| Every few months | If your drum unit has a cleaning slider for the corona wire, slide it gently back and forth a few times and return it to its home position. A dirty wire leaves long vertical streaks; a slider left out of place leaves one too. |
| When marks repeat | Measure the gap between marks that repeat down the page. Matching that distance to a roller or drum circumference, often listed in the manual, tells you which part is dirty or worn before you buy anything. |
| All the time | Use only paper and labels rated for laser printers and keep the vents clear. Wipe up spilled toner with a dry cloth rather than a household vacuum, which can’t trap the fine powder. |
| Every year | Check the manufacturer’s support site for a firmware update for your model, which can fix paper-handling and network bugs. |
Common problems
- Print quality Prints are faded or too light Pages come out pale, gray or washed out. Rule out draft and toner-save settings, then check ink or toner, clogged nozzles and a worn laser drum, in that order.
- Print quality Prints have streaks or lines Lines, bands or streaks run across or down your printouts. Read which way they run, then fix the clogged nozzles, misalignment or dirty laser parts behind them.
- Print quality Prints are smudged or smeared Ink smears, toner rubs off or pages come out with dirty marks. Work out whether paper, settings, dirty rollers or a laser fuser is the cause, then fix it.
- Ink, toner & tanks Still says toner low after replacing the cartridge New toner in, but the printer still says low, empty or replace? Check whether it means the drum, remove the packaging, reseat it and read a supplies page.
- Paper & feeding Paper is jammed in the printer Paper stuck inside? Remove it safely in the direction it travels, find any torn scraps, then reload the tray so it doesn’t happen again. Covers inkjet and laser.
- Paper & feeding Paper jam error but no paper is stuck The printer reports a jam but nothing is inside. Find hidden scraps, free the carriage, check doors and sensors, and spot the worn parts behind phantom jams.
- Paper & feeding Printer won’t pick up paper The rollers turn but the paper stays put, or nothing feeds at all. Check the tray, paper and settings, then clean or assess the pickup rollers that grab each sheet.
- Paper & feeding Pages come out wrinkled or curled Prints come out creased, wavy or rolled at the edges. Fix the paper, storage, guides and settings, and spot the laser fuser wear that needs a service.
- Power & hardware Printer is making grinding, clicking or loud noises Grinding, clicking, squealing or knocking? Learn which printer noises are normal, how to find and remove the cause safely, and which sounds mean a repair.
Error codes you might see
- 49.XXXX ERROR HP LaserJet 49 error: a firmware fault, often from bad data
- 79 SERVICE ERROR HP LaserJet 79 Service Error: causes and fixes
- Drum Error Brother Drum Error, Replace Drum and Drum End Soon
- Unable to Print XX Brother Unable to Print XX: machine error with a number
- PC LOAD LETTER PC LOAD LETTER and paper size mismatch messages
Useful how-to guides
Common questions
Is a laser printer cheaper to run than an inkjet?
For text, usually yes: toner yields many more pages per cartridge and doesn’t dry out. For a fair comparison, add the drum and other replaceable parts to the toner cost, divide each by its rated page yield, and compare against the same figures for the inkjet.
Can I print photos on a laser printer?
Colour lasers handle charts and graphics well, but photos look flatter than on an inkjet. Never use inkjet glossy photo paper, which can melt in the fuser; use only paper rated for laser printers.
What’s the difference between toner and the drum?
Toner is the powder that forms the image and runs out as you print. The drum carries the image onto the paper; it wears with use and is replaced less often, unless your model combines the two in one cartridge.
Why does toner rub off my pages?
The fuser isn’t melting the toner fully. Check that the paper type setting matches heavy or glossy stock and try fresh laser paper; if it still happens on plain paper, the fuser may be worn, which is a parts replacement or repair job.