LARGE STREAK OCCURS WHEN SCANNING HP 7740

[MONTYSHERIDAN]

LARGE STREAK OCCURS WHEN SCANNING WITH BOTH DOCUMENT FEEDER OR SCANNER BED. LAST PRINTER HAD SAME ISSUE BUT WORSE.

[MONTYSHERIDAN]

[Max3Aj]

@MONTYSHERIDAN, Welcome to the HP Support Community – it’s great to have you here!

I appreciate you taking the time to share your question. I'm more than happy to assist with this and provide a solution that works for you.

Based on your description and the uploaded scan image showing a large vertical streak when scanning from both the flatbed and ADF (Automatic Document Feeder) on your HP OfficeJet Pro 7740, here’s a step-by-step guide to resolve the issue:

Clean the Scanner Glass and ADF Strip

Streaks are most commonly caused by dust, smudges, or debris on the scanner glass or the narrow ADF strip.

What to Clean:

• Main scanner glass
• ADF scanner strip (small glass strip next to the main glass)
• Underside of the ADF lid

Cleaning Instructions:

1. Turn off the printer and unplug it.
2. Use a lint-free cloth slightly dampened with glass cleaner (do not spray directly on the glass).
3. Wipe the entire scanner glass and the ADF strip thoroughly.
4. Dry with a clean, dry cloth to avoid streaks.

Test Scan Again

After cleaning:

• Try scanning a document using both the flatbed and ADF.
• Check if the streak persists.

Isolate the Issue

If the streak still appears:

• Try scanning a blank sheet.
• Try scanning from HP Smart app or Windows Fax and Scan to rule out software issues.

Firmware and Driver Update

Ensure your printer is running the latest firmware and drivers:

• Go to Official HP® Support
• Select your OS and update both firmware and full feature software.

Hardware Check

If cleaning and updates don’t help, the issue may be hardware-related:

• Internal scanner sensor or ADF light bar may be faulty.
• Since you mentioned the previous printer had the same issue, ensure the environment is clean and documents are free of staples or tape that could scratch the glass.

I hope your issue is now resolved. If not, feel free to reply and we’ll continue helping until everything’s sorted!

If the post helped, please click “Accepted Solution” to help other users easily find it. And if you’d like to say thanks, just tap the “Yes” button!

Cheers,

Max3Aj

HP Support