Vertical Lines on scanner

[Tilly38]

Help me! Every photo I scan has a set of very faint vertical lines. What is causing this? How do I get to the glass to clean it? It’s an HP deskjet 3726 all in one printer. Everything is great except the scan 

[Betty0610]

@Tilly38

Welcome to the HP Support Community.

Does this happen only while scanning photos or all documents? Does this happen while copying too?

Clean the scanner glass and underside of the scanner lid with a soft, lint-free cloth sprayed with glass cleaner.

1. Turn the printer off, then disconnect the power cord.

2. Lift the scanner lid.

3. Spray a soft, lint-free cloth with glass cleaner, then wipe the scanner glass, glass strip (if present), the white backing under the scanner lid, and the white strip under the lid (if present) until clean, dry, and streak-free.

      CAUTION: 

   To protect the interior printer parts, do not spray the cleaner directly on the glass or on the underside of the lid.

   Figure : Clean the scanner glass and under the lid, and any glass or white strips (if present)

   1. White scanner lid backing

   2. White ADF scanner lid strip (if present)

   3. Glass ADF scanner strip (if present)

   4. Main scanner glass

4. Reconnect the power cord, turn on the printer, then close the scanner lid completely.

5. Load the original document or photo, then try to scan. Make sure the original document or photo is in good condition and free of tears, creases, folds, staples, or tape.

Let's try to reset the Printer here:

Turn the printer on, if it is not already on.

1. Wait until the printer is idle and silent before you continue.
2. With the printer turned on, disconnect the power cord from the rear of the printer.
3. Unplug the power cord from the wall outlet.
4. Wait at least 60 seconds.
5. Plug the power cord back into the wall outlet.
6. NOTE: HP recommends connecting the printer power cord directly to the wall outlet.
7. Reconnect the power cord to the rear of the printer.
8. Turn on the printer, if it does not automatically turn on.
9. Wait until the printer is idle and silent before you proceed.

You can also calibrate the scanner: https://support.hp.com/us-en/product/hp-deskjet-3700-all-in-one-printer-series/8954253/model/8954254...

Let me know if this helps.

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Thanks!

Have a great day!