In my case DADF dont work at all. No reaction on sensors even no reaction on open/close door sensor or ADF motor spin at printer booting. I thinking about defective DADF pcb board (part arround 40 dollars can be ordered from samsung autorized servise center, repectively now it is HP service center), but before buy parts, you can try upgr. firmware. Thats help to me resolve problem. FW can be downloaded from HP website under this type of printer and its easy to update. Need to connect printer through USB and then drag FW file to "usblist2.exe" file. Of course, FW upgrade must be enabled on printer... Somewhere under amdin settings/security/FW upgrade enable.
Please share how to upgrade firmware via usb in dead mode or in starting problem, samsung scx 6545,55n and also share shot codes like nvm initiliaze or hard reset in non working mode
