Furuno FR-1500 MARK-3 Series Installation Manual page 40

Adjustment
1. Set the controls on the radar as follows:
Range: 6 nm
A/C SEA, A/C RAIN, GAIN: fully counterclockwise
2. Connect a digital multimeter, set to 10 VDC range, to the following points on
the ARP-17 Board: (+), TP11 (VS+), (-), TP10 (VS-).
3. Adjust potentiometer R121 ("OFFSET") on the ARP-17 Board to show +0.09
to 0.13 V.
4. Set the radar controls and switches as follows:
Range: 24 nm
A/C SEA, A/C RAIN, GAIN: fully counterclockwise
Interference rejector: OFF
Echo stretch: OFF
5. Turn on the power while pressing the GAIN control. Press [MENU] [0] [0] [0] [0]
[6] [6] [0] [0] to display the SET UP 2 menu.
4-8
Figure 4-5 ARP-17 Board
Figure 4-6 SET UP 2 menu