Problem with connecting HP C7280 to Macbook via wireless.

I am "assisting" an AOL cust

1. Router is D-Link 2640

2. H.P. C7280 is an All in one printer .scanner Fax.

The C7280 will connect via wireless to the router, and is issued a correct IP No.,

I can see the HP via its web interface on the Macbook on Safari web browser.

The Mac connects to the printer with no problems via USB.

I cannot connect from the MAC via wireless to any function on the printer/scanner

All drivers and other updates on the Macbook are up to date.

Anything further that I can progress this, will be most welcome