Furuno fi-304 Instruction De Maintenance

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4.2.6 
Calibration
To access calibration mode, press and hold  SET more than 2
seconds.
To return to main function mode, press SET  when the text return
[RET] is displayed.
4.2.7 
Lighting
The instrument uses red back lighting for both the display and the 5
push-buttons. The light can be set at 4 different levels.
To access the light control, press and hold  PAGE  for more than 2
seconds. The flashing text [Lit OFF] will be displayed and the
display will be lit momentarily.
To select between the 4 light levels, press  UP: [LOW], [MED],
[MAX] and [OFF].  To lock the selected level, press SET.
The selected light level will be copied to all FI-30 instruments connected to the system.
When the lighting is on, it is not possible to reduce or turn off the light individually.
2 sec
2 sec