16
4
CONNECTION AND MAINTENANCE
■
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.
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.
MIC
DISC
Front panel
q
Dimmer cont. IN or
IGSW cont. IN
w
AF OUT
e
Det. AF OUT
r
Mod. IN
t
PTT control IN or
y
Horn drive cont. OUT
u
AF GND
i
Det. AF GND
o
Mod. GND
OPTIONAL CABLE PIN ASSIGNMENT
t
r
e
w
q
o
i
u
y
FTSW control IN
OPC-617
Cut off the bushing as in the illustra-
tion, when you install the optional
OPC-617.
■
Optional OPC-617 installation
Install the OPC-617 as shown below.
IC-F111_F121_F211_F221.qxd 02.12.26 10:09 AM Page 16 (1,1)
Summary of Contents for IC-F121
Page 1: ......
Page 13: ...10 2 OPERATION o s d R m n et y...
Page 20: ...sys and fuse n the aged with a ne or sur...
Page 21: ...18 5 OPTIONS...
Page 23: ...MEMO...
Page 24: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan...