Sometimes Wireless networks can be set in "isolated", or guest mode, meaning wireless clients are not able to see shared resources and printers on the network. Look through the router settings. Also, it is sometimes possible to set the Wireless in a different IP subnet, which would also prevent you from seeing the printer. Make sure the first 3 octets of your IPs, i.e. 192.168.0.* are the same for both wired and wireless clients.
I hope this helps.
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