[SOLVED] cups "Unable to locate printer"

[dpaddy]

I attempted to add my printer Brother_mfcj1170dw via the cups web interface as follows:

1) open http://localhost:631/ in firefox
2) click on Find New Printers <-- found my printer
3) click on Add This Printer
4) I downloaded mfcj1170dwpdrv-3.5.0-1.i386.rpm from Brothers website
5) After rpm2tar I copied brother_lpdwrapper_mfcj1170dw (from the tar file) to /usr/libexec/cups/filter/
6) I then specified brother_mfcj1170dw_printer_en.ppd (from the tar file) as the appropriate ppd file
7) click on Add Printer <-- this succeeded
I was confronted with

[dpaddy]

After intense trial-and-error the following is how I got printing to work (although it does not address my initial questions).

After doing the "add printer" as described above, the magic was