It would be nice if you could provide some debugging information as
described in the sane-sm3840 man page:

SANE_DEBUG_SM3840
              If the library was compiled with  debug  support  enabled,  this
              environment  variable controls the debug level for this backend.
              E.g., a value of 128 requests all debug output  to  be  printed.
              Smaller levels reduce verbosity. To see error messages on stderr
              set SANE_DEBUG_SM3840 to 1.

-- 
lost support for sm3840 family scanners
https://bugs.launchpad.net/bugs/115898
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