Icom IC-F521 - 5-3 Software Adjustment (Transmitting)

■ Optional UT-108 installation
Install the optional UT-108 unit as follows:
q Turn power OFF, then disconnect the DC power cable.
w Unscrew the 4 screws, then remove the bottom cover.
e Install the unit as shown in the diagram below.
r Replace the bottom cover and screws, then the DC
power cable.
UT-108
■ Optional UT-109/UT-110
installation
q Turn power OFF, then disconnect the DC power cable.
w Unscrew the 4 screws, then remove the bottom cover.
e Cut the print pattern on the PCB at the TX mic circuit (A)
and RX AF circuit (B) as shown in the following figure.
r Install the scrambler unit as shown in the left.
t Return the bottom cover and screws to the original posi-
tion.
A
B
Front panel
NOTE: Be sure to re-solder above
disconnected points, otherwise no TX
modulation or AF output is available
when you remove the scrambler units.
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CONNECTION AND MAINTENANCE