Is this a network printer?
If it is a network printer was it configured with a static IP or is it using DHCP?
Is the router also the DHCP server for the office? If so is it configured to the same subnet as the old router?
Network printer are often configured to use a static IP because a lot of routers do not support reserved IPs and if the IP of the printer changes, nobody can print. In this case, I am just about willing to bet that the IP of the printer stayed the same but all the computers changed. This can happen if your old router was configured (for example) with an IP address of 192.168.0.1 - it would assign addresses of 192.168.0.2, 192,168.0.3 etc to the computers on the network. If the new router has an IP of 192.168.1.1, then it would hand out addresses of 192.168.1.2, 192.168.1.3 etc to the computers.
192.168.0.x is a different network than 192.168.1.x (with a default subnet mask of 255.255.255.0)
This will cause a problem because the computers are on a different network from the printer (since its IP has not changed). The fastest and easiest way to fix this is to change the IP address of the router to be the same as the old router. Do not change the IP address of the printer unless you really feel like going around to all your computers and reconfiguring the printer ports.
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