Network printer not working, how to debug?

[R. G. Newbury]

On Sat, 2011-09-10 at 11:55 -0700, Gordon
> Charrick wrote:
>> >  I click the Network Printer dropdown under "Select Device" and the
>> >  printer shows up with the proper IP address. Under "Connection", "IPP
>> >  network printer via DNS-SD" is selected. I choose the driver and apply
>> >  the settings. It prompts to print a test page and I click to print it.
>> >  The job for the test page is submitted and a window with the settings
>> >  shows up and the Printer State shows as "Stopped - Destination printer
>> >  does not exist!". The Device URI is
>> >  "dnssd://Brother%20MFC-7860DW._ipp._tcp.local/".
> Try using a different Device URI.  The error you're getting is because
> the device URI doesn't include a queue name (because it couldn't be
> detected, I suppose).
>
> You may be able to find out the default queue name by visiting the
> printer's web server (if it has one built-in), or by consulting the
> printer's documentation.

I have a Brother MFC665CW connected wirelessly. I installed the cups and 
lpd driver rpms from the Brother site, and run a cups service on the 
computers which use that printer.

The URI for the printer is:  usb:/dev/usb/lp0

Why that URI I have no idea. I expected something like 
lpd:/192.168.2.10/PASSTHRU but the usb URI is what the install injected.

And it works. This printer also works with a Macbook Air but I have NO 
present recollection of doing the install process. It must have been 
automagic since I cannot recall it at all.

Geoff