Panasonic KX-G8300 Service Manual And Technical Manual page 53

KX-G8300
4-3 Heading Adjustment
Procedure:
1) Operate the radar to obtain a normal display.
2) Select a proper target echo (smail island, end of quay, etc.) located on the heading line direction and
near the edge of the screen.
3) Set the EBL line to the target, Measure the bearing.
4) Read out the vessel's bearing from the compass, and using a navigational chart find the relative
bearing of the target from the vessel's heading.
5) If there is a difference beetween them adjust Heading ADJ control (VR157) on the Adjustment board
of the CRT unit. If relative bearing difference is beyond adjustable range (+1°) by VR157, adjust the
position of the Magnetic Sensor Board (heading detector) as shown Fig. 50
Target Heading Marker
Bearing "a" should be the same as "b"
Bearing Alignment
(a<b) to increase the angle a®
(a>b) to increase the angle b°®
' ' Heading Sensor Board
Fig. 53.
4-4 Gain Preset Adjustment
Operate the radar and turn the A.C. Sea clutter knob counterclockwise as far as it will go. When the gain
knob has been rotated clockwise as far as it will go, proceed with the following adjustment if noise signals do
not appear on the CRT screen.
Procedure:
(1) Operate the radar in the 24-mile range.
(2) Turn the gain contro! clockwise and the A.C.Sea clutter knob counterclockwise on the display unit
as far as they will go.
(3) | Press the FUNC and IR keys to turn off the interference rejection (IR) mode. Some noise will now
appear on the screen. If not, adjust VR155 on the adjustment board (Refer to Fig. 51).
(4) | Check that the noise disappears from the screen when the gain knob position is set to within the
2 to 4 o'clock direction.
a N