MAX ER-1500 USA - Manual (Page 9)

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SETTING OR CHANGING DATA
When setting or changing any data, the “Key-Card” must be used to
initiate the change.
Operation
1. Insert the “Key-Card.” The symbol appears on the display.
2.
After setting or changing data, insert the “Key-Card” again.
The symbol disappears.
Keep the “Key-Card” in a safe place to prevent it
from being damaged, lost or used by an
unauthorized person.
If you do not touch any keys for 60 seconds,
the symbol disappears automatically.