I Optional Ut-109 Or Ut-110 Installation; I Optional Opc-617 Installation - Icom IC-F121 Instruction Manual

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 (DISC) as shown below.
r Install the scrambler unit as described in the installation of
optional UT-105, UT-108 or UT-111 as on the page at left.
t Replace the bottom cover and screws.
MIC
DISC
NOTE: Be sure to re-solder the
above disconnected points
when you remove the scrambler
units. Otherwise no TX modula-
tion or AF output is available.
CONNECTION AND MAINTENANCE

I Optional OPC-617 installation

Install the OPC-617 as shown below.
Front panel
OPC-617
OPTIONAL CABLE PIN ASSIGNMENT
t r e w q
o i u y
Cut off the bushing as in the illustra-
tion, when you install the optional
OPC-617.
q y
Dimmer cont. IN or Horn drive cont. OUT
u
IGSW cont. IN AF GND
w i
AF OUT
Det. AF GND
e
o
Det. AF OUT
Mod. GND
r
Mod. IN
t
PTT control IN or
FTSW control IN
4
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