I recently purchased an airport express router. My printer (Canon PixmaMX850 is plugged into the router through a USB cable. I cannot remotely print from my macbook pro despite the printer showing up in my print and fax. I re-installed the printer on my laptop with the cable plugged into my laptop but continue to get the message: "Error Number : 300 The printer does not respond. Make sure that the printer is plugged in, powered-on, and properly connected to your computer." I have done all of that with no success. It prints fine if the USB cable is attached to the laptop. Any ideas?
SOURCE: Scan function won't work with Mac OS10.5.5 & Airport
I have a new macbook pro OS 10.5 and installed a new HP L7590 all in one printer. Same problem. Called Apple and they confirmed that they do not have a driver for the Airport Express to allow scanning wireless. Therefore, SOL. If want to scan, then have to unplug from APE and plug into laptop. My solution is to use a USB hub and mount close to desktop so I can easily remove my HP and connect to laptop to scan often (or buy a cheap flatbed). GARY
SOURCE: When connected to Airport Express via USB, it will
Airport Express provides only a print server, not a networked usb hub so it can only print. I'm afraid you'll have to go back to wired for scanning.
SOURCE: I can't get it to print wirelessly with my airport
You have to setup this printer as a Network printer, the PC using it, must Browse for the PC on the network.
Setting up a wireless printer is not a complicated matter to accomplish. It can take as short as five steps to get the whole thing done.
Step #1: The Location of the Wireless Printer.
Since more than one computer would be making use of the wireless printer. It makes sense to figure out the best place to put it. The wireless printer should be set up at a place at home or in the office that is accessible to everyone and where there is ample space for paper, printer ink and other such paraphernalia.
Step #2: Bluetooth or Wi-Fi?
There are two connectivity choices when it comes to setting up a wireless printer, and these two choices are none other than Bluetooth or Wi-Fi. Most new computers and printers nowadays are equipped with either Bluetooth or Wi-Fi capacities, but if not, it is easy to get a wireless card that can be plugged using a USB port. The only difference is that Bluetooth printers has a smaller range than Wi-Fi.
Step #3: Enable Printer Sharing
The server computer’s operating system must be informed that the printer that will be added to its network is a wireless printer. In Windows Vista, this is done by accessing the network settings in the Control Panel and then activating file and printer sharing in the local area network settings.
Step #4: Share the Printer.
The other computers on the network must also be set up for using the wireless printer. To do this in Windows Vista, open the Control Panel in the classic view and then open Printers. Right click on the printer that is going to be shared, and then open Properties. In Properties, check the box that allows the printer to be a shared device.
Step #5: Continuous Troubleshooting
Wireless networks are prone to interruptions, and so it is important for whoever it is that is maintaining the wireless network at home or at the office to keep the connections to the wireless printer active. Nothing is more irritating that setting up a wireless printer and then encountering numerous glitches afterwards.
SOURCE: When printing with i Mac computer with Airport
Go to and find the printer in your OS, In Windows is Control Panel, when you find it,right click on and select as the default printer.
SOURCE: Cannot print using Apple Airport Express
Use the following link to try and troubleshoot your printer problem with the airport express...
http://support.apple.com/kb/TS1253
Canon Support Drivers PIXMA MP250 AirPort Express 802 11n 2nd Generation Guide to ports and connectors 
To print using Mac OS X v10.3 or v10.4
To print using Mac OS X v10.5
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