@KUMAR6968
I doubt we can offer anything you have not already tried.
For those reading:
Printer Specifications for HP OfficeJet Pro 6900 Printers
Paper Handling
There are only a few factors that govern the operation:
Paper Size (For example - sizes supported as explained in the specs)
ADF condition - Scan Quality (For example, ADF clean or not)
Paper type / condition (For example, Paper too thick, too thin, curled, too dry, too damp, embossed, mixed surfaces on different pages, mixed paper sizes in the stack - anything that prevents "easy feeding")
If the paper size is supported,
If the ADF is in prime condition (clean),
then the culprit might be the paper.
All else equal,
If the number of pages stacked in the ADF is near the maximum,
Yes, should work.
If it does not work, try reducing the number of pages.
Yes, I know - not wanted - simply ignore if not possible.
References / Resources
Troubleshooting > Scan
Improving Scan Quality
Printer Home Page - References and Resources – Learn about your Printer - Solve Problems
“Things that are your printer”
NOTE: Content depends on device type and Operating System
Categories: Alerts, Access to the Print and Scan Doctor (Windows), Warranty Check, HP Drivers / Software / Firmware Updates, How-to Videos, Bulletins/Notices, Lots of How-to Documents, Troubleshooting, User Guides / Manuals, Product Information (Specifications), more
When the website support page opens, Select (as available) a Category > Topic > Subtopic
HP OfficeJet Pro 6968 All-in-One Printer
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Dragon-Fur