The formatter is the board that the cable from the computer or network plugs into. Not hard to get to as you just remove the back cover and when looking from the back it is the board on the left side. Unfortunately it appears the part is scarce and quite expensive. The first thing you need to do is an engine test to confirm the formatter is the issue. The instructions are attached. To be honest you might be better off purchasing a used 2605dn as some of them go fairly cheap on ebay. Below is a link to one.
