Furuno CSH-5L/CSH-8L manual Adjusting the gain, Retracting the transducer, turning off the power

1. OPERATIONAL OVERVIEW

1.3.7Adjusting the gain

The [GAIN] control adjusts receiver sensitivity. It should be adjusted to see fish echoes clearly with minimal noise on the screen. Too high a setting not only causes excessive noise on the screen and makes it difficult to discriminate wanted fish echoes but also causes bottom echoes to be painted in strong colors, resulting that the echoes from bottom fish are masked by bottom reflections. A setting between 3 and 7 is usually suitable. Each time the control is operated the newly selected range appears in large characters for five seconds at the top of the sonar display. The current range is always displayed at the top right corner of the sonar display.

Gain too low Gain proper Gain too high

Examples of proper and improper gain

1.3.8Retracting the transducer, turning off the power

1.Set speed under 16 knots and then press the [↑] switch to retract the transducer. The lamp above the switch blinks while the transducer is being retracted. Transmission is stopped automatically. If you press the [↑] switch when the speed is over 16 knots and the speed warning is turned on in the SYSTEM menu, the message “Max allowable speed for extended transducer is 16 kt. Max allowable speed during raising lowering transducer is 16 kt.” and the audio alarm sounds. Press the [R/B key to silence the audio alarm.

2.When the lamp above the [↑] switch lights, meaning the transducer is completely retracted, press the [POWER] switch on the control unit to turn off the power.

3.Turn off the monitor.

Note 1: The transducer is automatically retracted into the tank whenever the power switch is turned off. However, for safety purposes, make it a habit to retract the transducer before turning off the power.

Note 2: The equipment can be set to automatically retract the transducer when the ship exceeds the operator-set speed. (Speed data required.) The transducer may be retracted at a different speed than set if the speed data is different from actual speed. In all cases, reduce the speed below 16 knots and then retract the transducer.

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