Okay, instead of using Terminal we can use Finder to see what the permissions are currently set to. So, can you open Finder and click on the Hard Drive. Then open the Library folder, then the Printers folder. You should see the RICOH folder. Select it, then click File > Get Info, and then expand the Sharing & Permissions entry. This will show what users and groups have access to this folder. Can you reply with the names and their respective privileges.
Note that with the previous Terminal commands, we were trying to add the admin group (which your main account will be a member of) to the list of accounts that have read and write access to this folder. This hopefully will stop the error message you are getting.
Pahu