Alan 28 - Page 8

120-CH MODIFICATION
1) | Open the radio by removing the 4 screws of the cover.
.2) Unsolder and free the two metallic tabs blocking the P.C.B. of the display.
3) Remove the screws near the display.
4) Carefully lift the P.C.B. of the display and turn it.
5) Remove the shield covering the components.
6) Select the microprocessor marked LC 7230.
7) _ Insert the 4 wires soldered in the loudspeaker hole on the P.C.B.
8) Re-solder the shield to the P.C.B. (step 5).
9) Replace the P.C.B. in the original position keeping also the metallic tabs and screwing the two screws.
10) Isolate the two tracks of the H/L button and solder to them the two wires coming from the pin 30 and 33 of LC 7230.
11)
To
re-establish
the
function
high
and
low
power
(ex
H/L),cut
the
track
which
from
the
rear
side
reaches
the
“CH
9"
button.
12)
Now
solder
the
track
that
previously
connected
the
“H/L”
button
from
under
the
display
(before
being
cut),
to
the
isolated
contact
of
the “CH 9”
button.
Following this step, the “CH 9” button controls the high and low power.
I-II-IIT = HIVLOW
BAND POWER CHANNEL
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NEW FUNCTION OF CONTROLS
The
modification
is
now
finished
and
the
radio
transmits
on
120
channels
in
3
bands
of
40
channels
each.
13)
To
display
the
band,
we
suggest
that
you
hole
the
plastic
frontal
to
insert
a
two-coloured
Led
and
connect
it
as
described
in
drawing
2.
In
this
way,
with
the
Led
turned
off,
the
radio
operates
on
the
40
"high"
channels;
with
the
green
Led
on
the
“low
channels,
while
with
the
red Led
on
the type-approved
channels.
One Chip CB Controller (LCD) Using for LC 7230
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# LCD Display
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LO7230—KX
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pe 10K LC7230 Pin 18
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