Furuno FS-1570 Service Manual page 40

JP3: When FAX-5 antenna is connected, select ACTIV.
(Short circuit between 1 and 2.)
L4
(To adjust BAIS, cut L4 and connect an ammeter.)
J3: PA OUT
6 MHz DDS
3Lo(455 kHz)
Fig.2.4.3 W/R 1, 2 (05P0734) board, FS-1570/2570
R25: PA BIAS ADJ.
(200 mA)
Fig.2.4.4 PA (05P0735) board, FS-1570
VCO
(F+54.455 kHz)
R33: PA IC ADJ.
2-15
2.4 Boards in Transceiver Unit
R37: VC ADJ.
J2: PA IN