Black lines on your copies can be caused by a number of different factors. Here are a few things you can try to eliminate them:

1) Clean the scanner glass: The black lines may be caused by dirt, dust, or debris on the scanner glass. Clean the glass with a soft, lint-free cloth and a gentle cleaner like isopropyl alcohol.

2) Replace the toner or ink cartridge: If the toner or ink cartridge is running low or is old, it may not distribute ink evenly on the page, causing lines. Replace the cartridge with a new one.

3) Check for damaged or worn parts: If the black lines persist, there may be damaged or worn parts inside the printer, such as the drum or fuser. Consult your printer manual for instructions on how to replace these parts.

4) Adjust printer settings: If you’re using a multifunction printer, check the settings to make sure you’re using the right resolution and paper type for your document. Adjust the settings as needed to see if that eliminates the black lines.

If none of these solutions work, you may need to contact a professional for help.