I Optional Ut-109 Or Ut-110 Installation; I Optional Opc-617 Installation - Icom IC-F1721 Instruction Manual

4
CONNECTION AND MAINTENANCE
I 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 (AF OUT), then solder CP37 as shown below.
r Install the scrambler unit as described in the installation of
optional UT-111 installation on p. 27
t Replace the bottom cover and screws.
MIC and AF OUT
NOTE: When uninstalling
the unit
Be sure to re-solder the
disconnected points and
un-solder the connected
points as above when you
remove the unit. Otherwise
no TX modulation or AF
output is available.
28
FRONT FRONT
CP37
Re-solder
Un-solder
Remove

I Optional OPC-617 installation

Install the OPC-617 as shown below.
OPC-617
OPTIONAL CABLE PIN ASSIGNMENT
q
Dimmer cont. IN or
t r e w q
IGSW cont. IN
w
AF OUT
e
Det. AF OUT
r
Mod. IN
t
PTT control IN or
o i u y
FTSW control IN
Cut off the bushing as in the
illustration, when you install
the optional OPC-617.
y
Horn drive cont. OUT
u
AF GND
i
Det. AF GND
o
Mod. GND