Lets make this real simple. If you disconnect from the network or computer and turn the unit on, does it come to ready and can you print information pages from the menu on the printer. If you can, then there is a bad job someplace trying to print. What I usually do is reset the network on the printer to dhcp and have it find a new ip address not being used. I then connect the printer with the new ip address as a local tcp/ip printer to one computer on the network. I then see if I can print without error to the printer. 99% of the time I can print ok and eventually the customer finds one computer that was not cleared or has printq issues causing the error on the printer.
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