Turning off the SN90 system
When you do not use the SN90 system, turn it off. Select Power Off on the top bar to turn off the SN90 system. You can also use the Power button on the Operating Panel. You must never turn off the SN90 system by means of the on/off switch on the Processor Unit.
A hull unit may be provided as an option. It allows you to lower and hoist the transducer. This task assumes that a hull unit is installed. If a hull unit is not installed you can disregard information related to lowering and hoisting the transducer.
Procedure
1 Select Power Off on the top bar.
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In the Power Off dialog box, select Power off or Exit to Operating System.
•  Power Off turns off the Processor Unit and the Transceiver Unit.
•  Exit to Operation System closes the SN90 program.
•  Both functions will also retract the transducer.
or:
2 On the Operating Panel, press Power, and keep it depressed for a few seconds.
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In the Power Off dialog box, select Power off or Exit to Operating System.
3 Wait while the SN90 program closes and the Transceiver Unit is turned off.
4 Turn off the display.
If required, refer to the instructions provided by the display manufacturer.