Furuno 1730 Operator's Manual page 22

Scanner Unit Preparation
After deciding the location of the scanner unit, preparation of the scanner unit is
necessary. Use the following procedure.
1. Open the radome package carefully. Remove the four MIO bolts together with spring
and flat washers on the bottom of the radome base assembly. These bolts, spring and
flat washers may be discarded, but do not use the bolts in step 4.
Fig.6-2 Preparing the Radome Base for Mounting
2. Unbolt the four fixing bolts used to hold the white radome cover to the blue radome
base and carefully lift the radome up. Remove the antenna stoppers. This will release
the antenna from its shipping preparation position, and allow it to rotate freely.
In very hot and humid climates, moisture may condense inside the radome, causing
corrosion. To prevent this, the vent tube is fitted. This tube is designed to allow the
radome to "breathe" while not allowing entry of water from oiitside into the radome.
Therefore, make sure the tube is kept free of foreign materials and is not pinched or
kinked. The vent tube extends downward by 27mm (1.1'") from the radome base. Ensure
the vent tube extends downward before installing the radome. See the outline drawing of
the scanner unit on page D-2.
3. Now install the radome base on the platform having 540mm (l/5"-2/5") in thickness.
Find the vent tube on the radome base. Next, position the radome base so that the
vent tube faces the stem direction. This alignment should be carried out as accurately
as possible.
SHIP'S BOW
4-eSl2 HOLES
18mra
CABLE ENTRY
RADOME
BASE ASSV.
"lOmm
PLATFORM
TO BE PREPARED
LOCALLY
STERN
027 HOLE FOR CABLE ENTRY
020 HOLE FOR VENT TUBE
HEX BOLT
Fig.6-4 Installing the Scanner Unit
PLATFORM
'm10x25 HEX BOLT
INotel: Do nol apply excessive
torque to fix the bolts. Use
a 15cm-long wrench.
(Fixing torque: 200"250kgcm)
4. After making sure that the vent tube is in the correct position, fix tlie radome base to
the mounting surface with the four MIO x 25 hex bolts, flat and spring washers supplied
as the installation materials.
Scanner Unit Mounting
The mounting surface must be parallel with the ship's waterline and provided with six
holes whose dimensions are shown in Fig.6-4; Four i2mm (1/2") holes for fixing, one
27mm (1.1") hole for the cable entry, and one 20mm (3/4") hole for the vent tube.
There is a vent tube on the base of the scanner unit which should face the stem direction.
The unit is adjusted so that a target echo returned from the bow direction will be shown
on the 0° (Heading Marker) position on the screen. When drilling holes, take care that
the holes are parallel with the fore and aft line.
6-3
6-4