If you own an ATM you are going to have to make decisions around how to take care of it. First Line Maintenance involves much more basic situations. ATMs are somewhat touchy, so even minor things can take them out of service. When paper moves through a machine, it can cause problems. For example, the receipt paper sometimes jams up. More often, cash jams bring a machine down. Especially because cash tends to be in poor shape, which makes it more likely to cause jams.