Icom IC-720A Instruction Manual page 33

INSTALLATION OF CW NARROW
FILTER
The following tools are needed for the installation of the
options:
8-1
Phillips Screwdriver
Screwdriver
Solder
De-soldering braid
Diagonal cutters
Soldering Iron (40W)
Soldering tool
Before performing any work on the set, make sure that the
power cord is detached from the transceiver.
1. Remove the bottom cover.
2. Remove the four screws at each end of the IF Unit (see
photo). Tilt the unit back toward you, being careful not
to damage the sockets and plugs that are installed on the
IF Unit.
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3. Using the screwdriver pry the cover of the IF Unit off,
exercise care to prevent bending the shield cover.
4. The location for the filter is shown in the photo. The
holes for mounting the legs and the leads of the filter are
predrilled. Be sure to orient the filter so that the label
on the top of the unit is facing the same direction as the
other two filters already mounted in the set. Insert the
filter flush with the board, bend the leads and legs flush
with the opposite side of the board and solder them in.
Trim the leads even with the solder points. This com-
pletes the installation. Replace the IF Unit, and the
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Location of CW Narrow Filter
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8-2
Follow steps 1 through 3 of the CW Narrow Filter instruc-
INSTALLATION OF AM FILTER
tions. Remove the LC Filter sub board, taking care not to
damage the printed patterns of the board. The holes must
be clear of solder when this sub board is removed.
Plug the AM Filter into the board, making sure that it is
oriented with the label on the top of the filter matching the
label on the adjoining filter. Bend the legs and leads flush
with the board, solder them in, and trim the leads flush with
the solder points. This completes the installation. Replace
the IF Unit, the screws, and the bottom cover.
Location of LC Filter