First, see the link that Alan provided.
From previous conversations in this forum on this topic, and from my previous research, I believe your FM is supposed to maintain warranty coverage for all copiers and printers in your stake. However, I also believe that most FMs do not purchase this extended warranty coverage, because it is usually cheaper to just fix or replace anything that breaks.
If your Stake PFR tells your FM that the copier is broken, he should include the make, model, and serial number of the copier. The FM should check for an existing factory warranty or extended warranty. If a warranty exists, then the stake can usually call for on-site service. If no warranty exists, then the FM must make the "repair or replace" decision, and pay for it from the FM budget.
Edit: It is interesting that the Copier Overview does not mention the Stake PFR, but rather makes this the responsibility of "Stake technology specialists, clerks, or librarians." That is good to know, since I am both the STS and the stake clerk.
Dana Repouille, Plattsmouth, Nebraska