As mentioned previously, there is NO tray heater option for the main frame or the paper bank.
The reason for tray heaters is to maintain temperature inside the machine while power is off. As long as the power cord is plugged in, a circuit breaker has not been tripped or the IO board has not failed the heaters come on when the machine goes into a power down or energy saving mode, and go off when the machine wakes up.
Bookmarks