Icom IC-725 Service Manual page 6

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PA
AND
FILTER UNITS
Tx/Rx
switching
relay
(RL13:
DS1-M-DC12V)
SWR
detector
circuit
Tx
low-pass
filters
Bias
control (Q4:
2SD1406Y)
Predrive amplifier
(Q1
:
2SC1971)
Drive amplifier
(Q2,
Q3: 2SC3133)
Cooling
fan control
circuit
Final amplifier
(Q5,
Q6; 2SC2904)
Thermal
switch
(SI
:
OHD-3
90M)
2
2

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