Furuno FR-1500 MARK-3 Series Installation Manual page 41

6. Press the [6] key several times to select QV from the VIDEO field and press
the [ENTER /SELECT] key.
7. Adjust potentiometer R120 ("LEVEL") on the ARP Board so that random noise
faintly appears.
8. Press the [6] key to select NORMAL from the VIDEO field.
9. Press the [ENTER/SELECT] key followed by the [MENU] key.
Input signal check
Connect speed log and gyrocompass and place the radar in transmit condition.
Confirm that all red LEDs, CR1, CR2, CR3, CR7, CR10, CR11 are off, provided
that the ship's speed is not zero. If a signal is absent the corresponding LED
lights.
Figure 4-7 How to adjust noise
Figure 4-8 ARP Board
4-9