TM731A.5 
 
The Modification:
 
This modification requires skill at fine soldering, a good ultra
fine-tipped pencil type soldering iron, and a short piece of 28 gauge
stranded wire.  You really should have at hand a Kenwood service manual
for this rig, with complete schematic and board layout diagrams, before
you attempt it, tho I HAVE tried to write my description so that you can
do the mod without a service manual at hand.
 
(1) Turn off power and disconnect the rig from its source of power
 
(2) Remove the BOTTOM cover of the rig.
 
(3) Lay the rig on your work table with the front panel pointing away
from you, and its rear heat sink pointing toward you.  On the right will
be the main volume and squelch control.  Look at the little connectors
that hook the front panel of the radio to the board you have exposed and
are looking at.   On the extreme left is one connector with eight pins
in a row, with the third pin from the left unused.  To the right of that
is a five pin connector with the middle pin not used.  To the right of
that connector is an electrolytic capacitor, to the right of the cap is a
two pin connector, and to the right of the two pin connector is a
phillips screw that is one of the screws that hold the board you are
looking at inside the rig.
 
Locate that five pin connector mentioned above, the one that has its
middle pin unused.  The SECOND WIRE from the LEFT of that connector
should be a RED wire.  That spot on the connector will be labelled on
the main board you are looking at as "RDM".
 
(4) CUT this red wire about three quarters of an inch from where it
leaves the connector.  Tape up the portion that goes to the connector.
 
(5) Strip off about a quarter inch of insulation from the portion of the
red wire that dives into the rig and heads toward the front panel.
 
(6) Locate "IC 8" on the radio.  This is actually NOT a real integrated
circuit, but rather is one of six little vertical circuit boards that
jut up like fins from the main board.  IC 8 is the left most of the six
such boards, and is right next to IC 9, which is a zig zag in line pin
integrated circuit.  IC 8 is located just toward you from the five pin
connector with the four wires... the one from which you cut the red
wire.   IC 8 is labelled as "IC 8" in silk screening on the circuit
board.
CONTINUED IN TM731A.6