Icom IC-725 - Page 6

•
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