Furuno FS-1575 Service Manual page 57

R79: PA BIAS ADJ.
(24V Vcc -> 400mA)
Temp. sensor
（FAN SW：40 deg.）
PWR board:
05P0874
40A Fuse
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PA board: 05P0868
P-SW:
Fig. 2.2.6 FS-1575T, heat sink side
2-9
2.2 Transceiver Unit: FS-1575T
R81: Q2, 3 BIAS ADJ.
(TP3-4: 40mV)
PA-IF: 05P0864A
R80: Q1 BIAS ADJ.
(TP1-2: 75mV)
R82: Ic meter ADJ.
R85: Vc meter ADJ.
R3:
VS meter ADJ.