Quanmax RPD-1171 User Manual page 40

If the two entries match, the new password is accepted and the screen displays
the following message:
SET PASSWORD OK
If the entries do not match, the screen displays the message:
PASSWORD NOT MATCH
in which case you must start again from the beginning.
Note: To modify or delete a previous password, access the Password function
as in Step 1, then use the backspace or delete key to erase the
individual characters.
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RPD-1171/1178 User Manual