Nauticam NA-D7500, Инструкция по эксплуатации

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It is required to reset the vacuum system when the vacuum level is dropped from target level
to totally lost. i.e. when opening the housing or changing port.
To reset when changing port/lens:
1.
Release vacuum.
2. Remove the port and lens from the
housing and camera.
3. Press the BLUE button once to reset
the system. The LED light will turn
blue for five seconds then it goes
into flashing blue light standby
mode.