8.Check that LEDs on the panel of the raise/lower control box light as follows:
a)UP, MD and DN LEDs light when corresponding limit switch is kicked.
b)UP and DOWN LEDs light while UP and DOWN switches are pressed and extinguish when switches are released.
9.Set the TEST/NORMAL switch to NORMAL.
10.At the control unit for the display unit, press the 
(mid position) switch. Confirm that the lamp above the switch blinks while the transducer is being
lowered, a short beep sounds when the mid limit switch kicks, and the lamp lights when the transducer is fully lowered.
11.Press the 
switch. Confirm that the lamp above the switch blinks while the transducer is being lowered, a short beep sounds when the mid limit switch is kicked, and the lamp lights when the transducer is fully lowered.
12.Press the 
switch. Confirm that the lamp above the switch blinks while the transducer is being raised, a short beep sounds when the mid limit switch is kicked, and the lamp lights when the transducer is fully raised.
13.Press the OFF switch. Confirm that the transducer is completely retracted
and then the power is turned off.
14. With the transducer lowered, confirm that the transducer is raised when or OFF is pressed.
3.2Heading Adjustment
When the BOW mark on the flange of the hull unit cannot be directed toward ship’s bow adjust the heading so an echo which is dead ahead appears dead ahead on the display.
1.Referring to the previous section, set the TX (transmission) to ON.
2.Locate a target in the bow direction (buoy, for example) and display it on a near range. If the target appears at 12 o’clock the heading alignment is correct. If it does not, measure the error and go to step 2.
Buoy |
| If target's |
| position is right of ship's | |
|
| |
|
| bow for example, hull unit |
|
| heading is skewed left. |
Heading adjustment
3.After turning off the power, turn it again on the power while pressing and holding down the [MENU] key. Release the figure from the [MENU] key after the self- test screen appears. And then after picture appears, press the [MENU] key three times to open the SYSTEM menu.