Konica Minolta FK-502 - Manual (Page 34)

Before Use 2
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Chapter 2
2
Reminder
Do not apply extreme pressure to the touch panel, otherwise it may be
scratched or damaged.
Never push down on the touch panel with force, and never use a hard or
pointed object to make a selection in the touch panel.
When the screen instructing you to call your service representative
appears and copying is no longer possible, a malfunction may have
occurred. Note the malfunction code, immediately unplug the machine,
and then contact the service representative to inform them of the
malfunction code.