Display the Extended Feature Settings screen.
Press [Administrator Tools].

Press [Heap/Stack Size Settings].
To change the heap size, press [Heap Size]. To change the stack size, press [Stack Size].

Press [Change].
Using the control panel's number keys, enter the values for "Heap Size" and "Stack Size", and then press [#].

Press [OK] twice.
Press [Exit].
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For details about how to display the Extended Feature Settings screen, see Displaying and Quitting the Extended Feature Settings on the Control Panel
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Changed settings are activated after the machine has been rebooted.
To restore the default values, press [Restore Defaults].