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9
CONNECTION AND MAINTENANCE
Optional UT-108 installation
Install the optional UT-108 unit as follows:
q Turn the power OFF, then disconnect the DC power cable.
w Unscrew the 4 cover screws, then remove the bottom
cover.
e Install the unit as shown in the diagram below.
r Replace the bottom cover and screws, then re-connect the
DC power cable.
UT-108
Optional UT-109 or UT-110
installation
q Turn the power OFF, then disconnect the DC power cable.
w Unscrew the 4 cover screws, then remove the bottom
cover.
e Cut the pattern on the PCB at the TX mic circuit (MIC) and
RX AF circuit (DISC) as shown below.
r Install the scrambler unit as described in the installation of
optional UT-108 as on the page at left.
t Replace the bottom cover and screws, then re-connect the
DC power cable.
NOTE: Be sure to re-solder the above
disconnected points when you remove
the scrambler units. Otherwise no TX
modulation or AF output is available.
MIC
DISC
Front panel
Front panel
IC-400PRO.qxd 03.6.19 6:13 PM Page 39 (1,1)
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