HP LJ 100 color M175nw, with ADF (document feeder); running Windows 7 (64 bit)
downloaded most recent driver software from HP (full package) HP CLJ_MFP_M175_N_sw_win_full_solution-acf.exe
When I click on the "HP LJ100 M175 Scan" icon
everything works & I can scan from the glass only (page by page)
There is NOoption in the scanner utility/software to choose the document feeder (screen shot below)
I had other HP printers & used to have the option to choose (glass or feeder) I uninstalled/reinstalled/ran HP print and scan doctor.exe (from HP) I cant find anything re this issue on HP.com support page
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