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The U2-40 error is the machine telling you that there is a communications error with your CRUM chip.
is there anything at all displayed on the screen??
if there is, press the #, interrupt, C, interrupt in rapid succession. If you don't know what the interrupt button looks like, it is the third button from the right on the control panel. You may have to try it a few times, as with age, the buttons are harder to push so they register that you are pushing them. Once you get into the simulation mode, press 16, then start, and follow the on-screen instructions. once the machine has reset the code, usually shows by going back to the main code screen, then press the CA button, or "clear all".(second button from the right) that will reboot the machine and hopefully clear the code.
It looks like this error is a CRUM chip error, which could be caused by the type of toner cartridge you are using, and or the actual CRUM chip. The connector could be bad (check the connector for the toner cartridge) or when you replaced the toner cartridge; it may have bent the plate that it is mounted on and it needs to be straightened, realigned.
1) Check that the Network Cable is inserted properly. 2) Check that the connected network supports TCP/IP protocol. 3) Check from the Web Page that the Primary/Secondary E-mail Server Address or the Destination FTP server/ Desktop PC address are properly set. 4) If the above address is described with Hostname, check that the DNS server is properly set. 5) Check that the SMTP server/FTP server/NST causes a trouble or not.
what is you OS? check you printer drivers. are they properly installed?, what is your connection between your PC to your printer?, AR 275 can be connected thru network, parallel port, and a USB... they have different printer drivers