Tx-Hv Board (Hv-9017) - Furuno FAR-2107 Series Service Manual

Marine radar/arpa

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7.3.6 TX-HV board (HV-9017)

The setting of JP1 and JP2 on the TX-HV board differs depending on the radar TX

output of 10 kW and 25 kW or more. See page.4-69 for the related setting.

(Q1:2SK1420)

The TX-HV board is comprised of a main inverter and sub inverter. Each inverter is

controlled by U1 and the switching frequency is about 45 kHz and determined by R2, 3

and C7. U1 incorporates the IC for pulse length control of MB3757 with its peripheral

circuitry molded.

CR23 lights up when the power is supplied to this board and CR21 lights up when over

current of about 0.7 A is detected on the TX-HV. VR1 should be adjusted so that the

output voltage of the main inverter of TP-1 is 35 VDC. TX-HV voltage is set at JP1 and

JP2. The voltage setting is 310 to 350 VDC in case of a 10 kW –radar (FAR-2x17) and

520 to 580 VDC incase of radar of 25 kW or more (FAR-2x27).

(Q2:2SK1432)

Fig. 7.3.27 Block diagram of TX-HV board

Over current

7.3 Processor Unit: RPU-013

CR21(Red):Over Current

CR23(Green): Power IND

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