JRC JFS-280 Instruction Manual page 56

Scanning sonar
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① [POWER] key
Use this key when the power is off to turn the power on.
<Power off>
2
<Forced power off>
② [PANEL] key
Every time this key is pressed the panel lighting gets incrementally brighter. When the brightest
level is reached, the setting returns to the dimmest setting.
There are five levels between dimmest and brightest.
③ [FALL] key
Press this key for about five seconds to start extending the transducer.
④ [STOP] key
This equipment does not have a stop function.
⑤ [SHED] key
Press this key to store the transducer.
⑥ [TILT AUTO] key
Press this key to switch between automatic and manual tilt.
Each time the key is pressed the function changes: Auto -> Manual -> Auto .
The automatic tilt angle operation can only be done in the main image.
The tilt angle in the main image switches between linked and not linked operations in the sub
image.
⑦ [TILT SELECT] key
If you press this key during automatic tilt, you can switch the setting for automatic range width
and the settings for center tilt with the [Tilt angle] knob.
2 Names and Functions of Parts
Press and hold the [POWER] key and the [PANEL] key at the same
time for about one second. When you hear the confirmation beep,
release your fingers from the keys. The transducer retracts if it is
extended, and then the power turns off.
Press and hold the [POWER] key and the [PANEL] key at the same
time for about seven seconds continuously. The power turns off even if
the transducer is extended.
Note: If you do a forced power off while the transducer is extended, you
will need to confirm that the oscillator is stored by turning the power
back on or by manually storing the transducer from the hoisting device.
2-8

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