Furuno FR-2135S manual ARP board adjustment, ARP Board 18P9002B

ARP board adjustment

1.Turn the GAIN, A/C SEA and A/C RAIN controls fully counterclockwise, and then transmit on the 12 nm range.

2.Connect a digital multimeter between TP7(+) and TP6(-) on the ARP Board.

TP7	TP6	R104 R103
Figure 4-6 ARP Board (18P9002B)

3.Adjust R104 on the ARP Board so the multimeter reads between 0.09 and 0.14 VDC.

4.Set controls and switches as below.

GAIN: fully clockwise (max.)

Interference rejector: OFF

Range: 24 nm

Echo stretch: OFF

5.Press [RADAR MENU] [0] [0] [0] [0] open the INITIAL SETTING3 menu.

6.Set the VIDEO SIG field to DIGITAL and press [ENTER].

7.Adjust R103 on the ARP Board so noise just appears on the display.

Too little noise Proper noise Too much noise

Figure 4-7 How to adjust noise

8. Set VIDEO SIG to ANALOG and press [ENTER].

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