Fix printer streaks by testing first, then cleaning the right part

By Device Basics

To fix printer streaks, first print the printer’s own test page. Then take the matching route: check inkjet nozzles, use laser-printer maintenance, or clean the scanner glass if only copies and scans have lines. Don’t start by scrubbing internal parts or buying a full set of cartridges.

Find the exact model number before opening anything. The steps below give you a safe order; menu names and permitted cleaning methods depend on the model.

1. Check where the streak starts

Load fresh, supported plain paper and print a built-in nozzle check, print-quality report or test page using the printer’s control panel or official utility. Keep the page so you can compare it after each change.

• The test page also has streaks: follow the inkjet or laser route below.
• The test page is clean, but a document has streaks: try a different document and application, then check print settings before opening the printer. A clean test points you toward the file, software or settings, though it does not rule out every printer fault. Epson’s product-check guidance and HP’s print-quality troubleshooting use these checks to narrow the problem.
• Printing is clean, but copies or scans have lines: scan the same original on the flatbed glass and through the automatic document feeder (ADF). A line that appears only through the feeder points toward contamination on its scanning glass. Lexmark explains this pattern.

Also check that the selected paper type matches what you loaded. Damp, curled or unsuitable paper can contribute to smears; a laser printer needs laser-compatible paper, not paper intended only for inkjets. Epson and HP include paper checks in their quality troubleshooting.

2. Inkjet printer: check nozzles before cleaning

This route is for printers using ink cartridges or refillable ink tanks.

1. Check ink levels and error messages. Refill or replace supplies as your model instructs. On tank printers, inspect the visible ink level rather than relying only on an estimate.
2. Print a nozzle-check pattern. Look for gaps, missing segments or a faint color pattern. Use the example in your model’s manual to interpret it.
3. If the pattern has gaps, follow the indicated cleaning routine. Usually this is the built-in printhead cleaning; an almost entirely missing pattern may require a different procedure. Let cleaning finish, then check the nozzles again. Don’t turn the printer off or open it during the cycle.
4. If the nozzle pattern is complete but streaks remain, check settings and alignment. Match the paper type, try a higher quality setting, disable high-speed printing if available, and run the model’s printhead-alignment routine.

These checks follow Epson’s ET-3850 maintenance and banding guidance. For that model, the nozzle check is under Maintenance → Print Head Nozzle Check; other models may use different menus.

Don’t run cleaning cycles endlessly. Follow your model’s limit and waiting period. For example, Epson tells ET-3850 owners who see no improvement after up to three head cleanings to turn the printer off and wait at least 12 hours before checking again. Its separate Power Cleaning uses a lot of ink: each tank must be at least one-third full, and the maintenance box must have sufficient free space. It is not a routine first step. See the model’s cleaning instructions.

For ink smears, especially on the back of the sheet, look for an approved paper-guide or paper-path cleaning routine. Start with that built-in function, not a cloth pushed into the printer. Epson provides a separate paper-guide cleaning procedure for this symptom.

3. Laser or LED printer: use toner-side maintenance

This route is for printers using toner. Don’t apply inkjet printhead-cleaning advice to them.

1. Check the supplies-status report. Toner at its estimated end of life can affect quality, but a low warning alone does not necessarily require immediate replacement.
2. Run the model’s cleaning-page function, if it has one. HP’s LaserJet Pro MFP 4301–4303 guidance uses this to address accumulated paper, toner and dust that can cause streaks, smears and repeating marks. Leave the printer on until the routine finishes. HP’s instructions cover both checks.
3. Use only the internal cleaning procedure approved for your model. Some Brother printers have a sliding corona-wire cleaning tab. If yours does, follow its diagrams and return the tab to its marked home position to avoid poor print quality. Brother’s corona-wire instructions apply to the models listed on that page.

Don’t touch or casually wipe the imaging drum. HP warns that fingerprints can cause print-quality problems. Brother permits targeted drum cleaning on some models, with specific tools and precautions—not a general wipe-down. Use the exact manual rather than a generic cleaning recipe. HP’s drum precautions and Brother’s model-specific troubleshooting explain these limits.

Retest before buying parts. A persistent streak can involve the toner cartridge or drum; its color and appearance help narrow the next step, but do not prove which part needs replacing. Brother’s troubleshooting sequence checks these possible causes before recommending replacement.

4. Lines only on copies or scans: check scanner glass

If the flatbed scan is clean but the feeder scan has a line, locate the narrow ADF scanning-glass area in your manual. A small spot of glue, ink or correction fluid there can become a line along the scanned page. Lexmark’s guide explains why.

Follow your model’s shutdown instructions, then clean the designated glass and backing area with the recommended soft cloth and cleaner. Don’t spray cleaner directly into the machine. For example, Epson’s ET-3850 instructions require switching off and unplugging before cleaning, and using a lint-free cloth moistened with a little glass cleaner rather than spraying directly onto the glass.

Reconnect the printer and repeat the same scan or copy to check the result.

When to stop

Stop before any step that requires unapproved solvents, forced disassembly or touching an unidentified internal surface. If the supported cleaning sequence makes no improvement, or you see damaged parts or a service error, use the manufacturer’s model-specific support.

Have the model number, error message and before-and-after test pages ready. Note whether the streak affects one color, ordinary prints, flatbed copies or feeder scans. That gives support a clearer starting point than “the printer prints badly.”