Furuno FR-2115/2125 manual Confirming Magnetron Heater Voltage, Magnetron heater voltage rating

3.7 Confirming Magnetron Heater Voltage

Magnetron heater voltage is adjusted at the factory. However, confirm that it is within the prescribed rating.

Table 3-1 Magnetron heater voltage rating

Rating	FR-2115 (12 kW)	FR-2125 (25 kW)
ST-BY, 0.125 nm	7.4 V-7.6 V	8.2 V-8.4 V
TX, max range	7.4 V-7.6 V	6.5 V-7.5 V

1.Press [RADAR MENU] [0] [0] [0] [2] [0] to open the INITIAL SETTING2 menu.

2.Press [5] to select the 5. SCANNER STOPPED field and the TX option.

3.Disconnect connector P821 from the scanner unit.

4.Turn off the antenna switch in the display unit.

ANTENNA switch

ON

OFF

PM

ANTENNA

TUNE

DEGAUSS ERROR

Figure 3-4 Antenna switch in tuning compartment

5.Turn off screen brilliance.

6.Measure voltage between pins #12(+) and #5(-) on connector P801 on the RFC Board (03P9243) in the scanner unit.

7.If the voltage is not within the rating shown in Table 3-2, adjust potentiometer VR1 on the RFC Board.

J611

J801

VR1

J821

Figure 3-5 RFC Board

3-4