10
3. ADJUSTMENTS

3.1 Installation Check

After installing the system it is a good idea to
check it for proper install ation, following the
checklist provided below .
❒ Cable gland is facing toward the stern.
❒ Four fixing bolts securing the antenna unit
are securely tightened.
❒ The signal cable is wat erproofed at the base
of the antenna unit.
❒ The antenna cable is securely retained
against the mast or mounting and i s free of
interference from running rigging.
❒ The cable gland on the deck or bulkhead i s
waterproofed, if prov ided.
❒ Connectors of external equi pment are
securely plugged into the radar disp lay unit.
❒ The power connections to the batter y are of
correct polarity.

3.2 Exchanging Display

Unit of Previous Model

When exchanging the display unit of the
MODEL 1712 with that of the MODEL 1622 or
1621/1621 MARK-2, it is necessary to select
the appropriate display setting . This should be
done with the radar in stand-by.
1. Press % and & together for about 10
seconds to show the display shown in
Figure 20.
NAV DATA (NMEA 0183)
GLL BWR BWC GLC GTD
RMA RMB RMC VTG MTW
DBT DBS DPT GGA
PROGRAM NO
03591620XX SEL MENU
BY KEY
MAIN DEMO
▲
▲
/
MODEL 1712 1622 1621/M2
DISPLAY
1
2
Figure 20 Maintenance menu
2. Select MODEL by %.
3. Select 1622 or 1621/M2 by .
4. Press the [MENU] key to close the menu.

3.3 Adjustments

Do the following in order to adjus t the radar.

1) Adjustment of picture

1. Press the [POWER] key on the display unit.
The display should light. In approxim ately
one minute, ST-BY appears at the screen
center.
2. When ST-BY appears press the [TX] k ey.
The radar will start transmitting, and you
will probably see some targets, even
though the radar is not yet properly
adjusted.
3. Adjust the GAIN to display a small amount
of noise on the screen.
4. Press the [–] key several times to select
the minimum range. Adjust t he STC to
display nearby radar targets clearl y on the
screen. Too much STC action will eliminate
small targets, and too little STC acti on will
cause the screen to be so full of targ ets
and noise that it is hard to determine whi ch
target is which as compar ed to visual
sightings.