Try another USB -Port, (no USB 3 whenever possible), check USB cables,

check if the file 'iscan' is in 'etc/sane.d/dll.d/
content:
'epkowa'

edit '/etc/sane.d/dll.conf'

comment all entries by adding '#' in front of every line
add 'epkowa' (uncommented !)

edit '/etc/sane.d/epkowa.conf'
comment the lines
'usb' and 'scsi'
uncomment the line
'#usb 0x04b8 0x0110' by removing the '#' and correct ProductId (0x014a)
looks like 'usb 0x04b8 0x014a' then.
spend some candles and reboot ...

Finally: Are you really sure the scanner is working ?

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https://bugs.launchpad.net/bugs/1728012

Title:
  Many 3rd party scanner drivers are broken by a sane change

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