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World of Ham Radio 1997
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r7000_18.doc
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R7000.18
IV The switch board
Locate the speech switch on the SW3 board. Beware, the
ICOM service manual has incorrect information
(reversed) concerning the placement of switches on SW3.
The speech switch is S17. Locate the pattern/trace
below on the solder side of the SW3 board.
o
/ D31
wire A / o <-----------------Point P
#_____________/ /
_______ /
/ \ /
o o---o o Speech switch (S17)
#_______/
wire B
Unsolder the speech switch, the diode D31 and the wire
A. Insulate the wire A so that it does not touch any-
thing. Solder the 47K ohm resistor where the diode D31
was. Solder the new switch (SPUT 19167A) where the
speech switch was, in the same position. Solder the
wire that you have previously soldered to IC8 pin 19 to
Point P. Solder a wire between where wire A was sol-
dered and ground. A good place to connect to ground is
around the screw next to S18 on the SW3 board.
Ground
o
/ 47K ohms
/ o ------------------> to IC8 pin 19
#_____________/ /
_______ /
/ \ /
o o---o o New switch
#_______/
wire B
Verify your work and reassemble the unit.
V Results
In the "out" position, the switch gives you the origi-
nal 99 memories, in position "in" you have 99 more
memories. These memories will be most likely full of
garbage, so the first step is to clear them using the
clear switch. Clear all the 99 memories.
This modification also double the program scan mode
memories. For example, you can have two programmed
scan depending on the position of the switch when you
do a "SET".