Often, horizontal streaks are the result of a clogged or dirty nozzle in your printer. The following steps can help you troubleshoot and fix your printer:

1. Check paper tray for any paper jams.
2. Clean the paper feed rollers with a damp cloth.
3. Remove any dust or debris from within the printer itself.
4. Check the ink cartridges for any signs of wear-and-tear and consider replacing them.
5. Undertake a deep-clean process for the printer nozzle.