It doesn't have to be a printer, scanner, copier, or MFC to be a duplicate IP. In my experience lately it's been either a wireless laptop or a smartphone. All it's got to do is want the same IP address to be a problem. The simplest test is to disconnect the printer then ping the desired IP address. If you get a response somebody else is using the same IP.
I had this very frustrating conversation with an IT professional not too long ago. I use a little utility called NetScan, that will pick up all IP addresses on the network, and their MAC addresses. So I was able to identify the MAC address, and from that the manufacturer of the device, which turned out to be a Samsung Smartphone. So with the IT professional on the line I asked "Who has the Samsung phone and would she please turn it off for a moment." To his great surprise this solved the issue. He refused to admit to the end that it was a duplicate IP.
=^..^=
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