Printer Problem Diagnosis

Likely cause. Some nozzles are partly clogged or misfiring, so the print head skips thin lines as it moves across the paper. Less often, a draft quality setting or a paper feed problem causes evenly spaced bands.

Try these fixes in order:

1. Print again at Standard quality, with the paper type set to the paper in the tray. Draft and ink-saving modes can show bands on their own.
2. Print the nozzle pattern or your printer’s own nozzle check to see which colors have gaps.
3. Run one head cleaning cycle from the printer menu or its software, then check again.
4. If gaps remain, print a purge sheet for those colors and let the printer rest for a few hours before checking again.
5. If the bands are evenly spaced and appear in every color at once, check the paper path: use fresh paper and clean the feed rollers as described in your manual.
6. If nothing changes after a rest and a second cleaning, the cartridge or the print head is worn out.

Repair or replace? If your print head is built into the ink cartridge, a new cartridge also replaces the head. On printers with a permanent head, a head replacement can cost close to a new printer, so compare before paying for a repair.

Next: print the Nozzle Pattern Test Page

Likely cause. One channel isn’t printing at all. The usual reasons are an empty cartridge or tank, protective tape or a clip left on a new cartridge, a cartridge that isn’t fully seated, or nozzles that are completely blocked.

Try these fixes in order:

1. Check the ink level for that color in the printer display or software.
2. Take the cartridge out, remove any tape or plastic clip, and reinstall it until it clicks. On ink tank printers, check that the tank has ink and has been primed as the setup guide describes.
3. Print the single color page for that ink to confirm the channel is really empty and not just weak.
4. Run one or two cleaning cycles, then print a purge sheet for that color.
5. Let the printer rest overnight, then check again. Dried ink can take hours to soften.
6. Replace the cartridge. If the color is still missing with a new cartridge, the print head needs service.

Repair or replace? A missing color with a full, new cartridge points to the head. Whether it’s worth repairing depends on the printer’s age and price; for most home inkjets a new printer is the cheaper path once the permanent head has failed.

Next: print the single color test pages

Likely cause. Usually one ink is weak while the others print normally, so every color leans away from it. A cartridge in the wrong slot, a color or paper setting, or third-party ink can do the same.

Try these fixes in order:

1. Print our color test page, which removes any app-specific color settings from the equation.
2. Look at the solid swatches: weak magenta makes reds orange, weak cyan makes blues purple, weak yellow makes greens blue.
3. Check that each cartridge sits in the slot marked with its color.
4. In the print dialog, set the paper type to match the paper, and turn off grayscale, vivid or photo enhancement modes.
5. Run one cleaning cycle for the weak color and print a purge sheet if it improves only partly.
6. If you use third-party ink, try a genuine cartridge for the color in question.

Repair or replace? Color casts are rarely a hardware failure. Fixing settings, ink and nozzles solves most of them; repair is only worth considering if one channel stays weak with new ink after cleaning.

Next: print the Color Printer Test Page

Likely cause. The print head is out of alignment, so drops from different passes or nozzle rows land slightly apart. Damp paper, the wrong paper type or printing on the wrong side of coated paper can also blur text.

Try these fixes in order:

1. Run the print head alignment from the printer menu or the maker’s software, and follow the on-screen pattern selection.
2. Use fresh, dry plain paper and set the paper type to Plain paper.
3. For photo or coated paper, print on the bright, coated side.
4. Place the printer on a flat, stable surface; vibration during printing can blur lines.
5. If your manual describes cleaning the encoder strip, do it with care. Otherwise, contact support.

Repair or replace? Alignment problems are almost always fixed by the built-in alignment. If doubling remains after alignment on plain paper, the carriage or encoder may need service.

Next: print the Printer Alignment Test Page

Likely cause. Ink has built up on a roller or on the platen under the paper, so every turn of that roller leaves a mark. Curled paper rubbing against the print head can also leave regular smudges.

Try these fixes in order:

1. Measure the distance between two marks with the rulers on our 40% gray page. Marks at the same spacing come from one roller.
2. Run the paper guide or roller cleaning function if your printer has one; it feeds paper through to clean the path.
3. Feed several sheets of plain paper with nothing printed on them.
4. Flatten curled paper, store it flat, and avoid very heavy ink on thin paper.
5. Clean the feed rollers following your manual, with a lint-free cloth lightly dampened with water.
6. If marks continue, a roller or the paper path may need service.

Repair or replace? Cleaning fixes most repeating marks on inkjets. A worn roller is a service job; weigh it against the printer’s age.

Next: print the 40% gray field with rulers

Likely cause. Either no ink reaches the paper, because of empty cartridges, tape left on new cartridges or a fully dried head, or the job never reaches the printer correctly.

Try these fixes in order:

1. Print a nozzle check or status page from the printer’s own control panel. If it prints, the printer works and the problem is the computer, driver or app.
2. If the printer’s own page is blank too, check every cartridge for ink and remove any tape or clips.
3. Run two cleaning cycles, then let the printer rest for several hours.
4. Install a new cartridge for the colors that still print nothing.
5. If even new cartridges print blank, the print head needs service.

Repair or replace? When the printer’s own page prints, nothing needs repairing: see our guide for printers that print a test page but nothing else. A blank page with new ink points to a failed head.

Next: print the Color Printer Test Page

Likely cause. The paper size in the print dialog doesn’t match the paper in the tray, the page is being scaled, or the paper is loaded at an angle.

Try these fixes in order:

1. Choose the paper size that matches the tray, Letter or A4, in the print dialog and in the printer settings.
2. Set Scale to 100% or Actual size and turn off Fit to page.
3. Slide the paper guides against the stack so the paper feeds straight.
4. Print the scale ruler page and measure it: if the rulers are correct but the edges are missing, the paper size setting is wrong.
5. Turn off borderless printing unless you need it; it enlarges the page slightly and crops the edges.

Repair or replace? This is a settings problem, not a fault. No repair is needed.

Next: print the Print Scale Ruler Test Page

Likely cause. Low ink, a draft or ink-saving mode, the wrong paper type, or partly clogged nozzles in several colors at once.

Try these fixes in order:

1. Check the ink levels and replace any cartridge that is low.
2. Print at Standard or High quality with the correct paper type selected.
3. Print a nozzle check; if it shows gaps, run one cleaning cycle.
4. Print a purge sheet if colors improve only partly after cleaning.
5. If you use refilled or third-party ink, try a genuine cartridge to compare.

Repair or replace? Faded prints are rarely a hardware fault. Ink and settings fix nearly all cases.

Next: print the Color Printer Test Page

Likely cause. Toner is running low or is unevenly spread in the cartridge, or the drum or developer roller is worn. Bands at a regular spacing come from a roller.

Try these fixes in order:

1. Check the toner level in the printer menu or software.
2. Take the toner cartridge out and gently rock it from side to side, if your manual allows, to spread the toner evenly.
3. Print a cleaning page if your printer offers one.
4. If the bands repeat at a fixed distance, measure it on the 40% gray page and look it up in your model’s repeating defect table.
5. Replace the toner cartridge or the drum unit, whichever the table or the manual points to.

Repair or replace? Toner and drum units are consumables, so replacing them is normal maintenance rather than a repair.

Next: print the 40% gray field with rulers

Likely cause. That color’s toner cartridge is empty, its packing seal or tape is still in place, it isn’t seated properly, or its drum or imaging unit has failed.

Try these fixes in order:

1. Check the toner level for the missing color.
2. Remove the cartridge and take off any remaining packing material, seals or tape, then reinstall it firmly.
3. Print the color laser page: if one band is completely empty, that color’s cartridge or drum is the cause.
4. Run the printer’s color calibration.
5. Replace the toner cartridge, then the drum or imaging unit for that color if the problem stays.

Repair or replace? Replacing toner or an imaging unit is routine. If the color stays missing with new parts, contact the manufacturer’s support.

Next: print the Color Laser Printer Test Page

Likely cause. Color calibration has drifted, one toner is running low, or the colors are out of registration. Paper type and color settings in the driver also change the result.

Try these fixes in order:

1. Run the color calibration or color adjustment from the printer menu.
2. Check toner levels and replace the low color.
3. If shapes have colored fringes, run the color registration function.
4. Set the paper type in the driver to match the paper, and check that grayscale or toner-save modes are off.
5. Print the color laser page again to compare.

Repair or replace? Calibration and toner fix most color problems. Persistent registration errors after calibration may need service.

Next: print the Color Laser Printer Test Page

Likely cause. Damp paper, a paper type setting that doesn’t match the paper, toner that is spreading because of a worn drum, or, on color lasers, colors that are out of registration.

Try these fixes in order:

1. Load fresh paper from a sealed ream and store paper away from humidity.
2. Set the paper type in the driver to match the paper.
3. On a color laser, run color registration or calibration.
4. Print the laser text page and compare the small text with a previous print.
5. Replace the toner cartridge or drum unit if the blur remains.

Repair or replace? Paper and settings fix many cases. A worn drum is a normal consumable replacement.

Next: print the Laser Printer Text Test Page

Likely cause. A spot on something that turns, usually the drum, a developer or transfer roller, or the fuser, leaves the same mark every time it comes around. The distance between marks tells you which part.

Try these fixes in order:

1. Print the 40% gray page and measure from one mark to the next identical mark with the millimeter ruler.
2. Look up that distance in the repeating defect table for your exact model, in its user guide or on the maker’s support site.
3. Print a cleaning page if your printer has one, then print the test page again.
4. If your printer has a separate drum unit, clean it the way the manual describes. Don’t use solvents on drums or rollers.
5. Replace the part the table points to: toner cartridge, drum unit or fuser.

Repair or replace? Toner cartridges and drum units are consumables. A fuser is more expensive; on older printers, compare its price with a new printer before replacing it.

Next: print the 40% gray field with rulers

Likely cause. A new toner cartridge still has its seal or tape, a cartridge isn’t seated, the toner is empty, or the job isn’t reaching the printer correctly.

Try these fixes in order:

1. Print a configuration or status page from the printer’s own control panel. If it prints, the problem is the computer, driver or app.
2. Remove the toner cartridge and check for a pull tab, seal or protective cover, then reinstall it firmly.
3. Check the toner level and try a different cartridge if you have one.
4. If the printer’s own page is blank with good toner, contact support: the fault is inside the printer.

Repair or replace? When the printer’s own page prints, nothing needs repairing. If it’s blank with new toner, a service visit or replacement is needed.

Next: print the Laser Printer Text Test Page

Likely cause. The paper size set for the tray doesn’t match the paper, the page is being scaled, or the paper is feeding at an angle.

Try these fixes in order:

1. Check the paper size in the print dialog and the size set for that tray on the printer itself; many lasers store a size per tray.
2. Set Scale to 100% or Actual size and turn off Fit to page.
3. Adjust the tray guides so they touch the paper stack.
4. Print the scale ruler page and measure the squares and rulers.

Repair or replace? This is a settings problem. No repair is needed.

Next: print the Print Scale Ruler Test Page

Likely cause. Low toner, a toner-save or economy mode, a density setting turned down, damp paper or a worn drum.

Try these fixes in order:

1. Turn off toner save or economy mode in the driver.
2. Check the toner level and gently rock the cartridge to spread the remaining toner.
3. Raise print density in the printer settings if your model has the option.
4. Use fresh, dry paper and the correct paper type setting.
5. Replace the toner cartridge, then the drum unit if prints stay faint.

Repair or replace? Faded prints are almost always toner, settings or a drum, which are all consumables.

Next: print the Laser Printer Text Test Page

Likely cause. Something stays in the same place as the paper moves past it: a scratch on the drum, dirt on the laser window or charging parts, or toner leaking from the cartridge. White streaks block toner; dark streaks add it.

Try these fixes in order:

1. Print the full black or 40% gray page to see the streak clearly.
2. Remove the toner cartridge and check for leaks or damage.
3. If your drum unit has a cleaning slider or tab for the charging wire, use it as the manual describes.
4. Clean any other parts your manual lists, such as the laser window, with the method it recommends.
5. Replace the toner cartridge, then the drum unit if the streak stays in the same place.

Repair or replace? Most streaks are fixed with cleaning or a new toner or drum. If they remain with new consumables, contact support.

Next: print the 40% gray field with rulers

Likely cause. The drum is placing toner where it shouldn’t, because it’s worn, the toner doesn’t suit the printer, or the air or paper is humid. Faint copies of the page lower down, called ghosting, can also come from the fuser or a paper type setting.

Try these fixes in order:

1. Use fresh, dry paper and set the correct paper type.
2. Print the laser text page: haze shows in the white areas between paragraphs.
3. If you use third-party toner, try a genuine cartridge.
4. For ghosting, measure the distance between the image and its ghost and check your model’s repeating defect table.
5. Replace the drum unit or toner cartridge; if ghosting continues, the fuser may need service.

Repair or replace? Haze is usually a drum or toner issue, both consumables. Persistent ghosting on an older printer may mean a fuser replacement; compare its cost with a new printer.

Next: print the Laser Printer Text Test Page