If your terminal is asking for a maintenance password or has accessed the Verifone Admin menu, it's possible you are seeing a list of users, such as 'maintenance', 'Level 1', 'Level 2', and 'supervisor'. Check also if the terminal says 'tamper' or 'tampered' anywhere on the screen.
You do not need passwords for these users. Just press "Yellow" on the terminal, then select "run apps" or "reboot". If new options do not appear, just reboot the terminal.
If the terminal cannot start apps because of an active tamper, the terminal will have to be replaced.
If your terminal is consistently ending up in this menu screen, please contact Adyen Support.