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Icom ICR7000 mods
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ICR7000.1
Making the Modification
Accessing this circuit board is not difficult, and
involves the same steps used when installing the
optional Remote Controller or Speech units.
Use a towel to cover your work area to avoid scratching
the R7000 cabinet. Unplug the R7000 from the AC line,
and turn the radio upside down. Remove the bottom
cover by removing the 12 screws holding it in place.
Remove the 4 screws holding what ICOM terms the "parti-
tion panel". Pictures on pages 32 and 34 of the R7000
Instruction Manual show the partition panel. After
removing this panel, the component side of the LOGIC
UNIT circuit board is accessible.
Locate R18, a 270,000 ohm 1/8 watt resistor, near con-
nector J5. You may wish to remove plug P5 from J5 tem-
porarily if it gets in your way. Carefully solder a
470,000 ohm resistor in parallel with R18. I used a
1/4 watt resistor as it was the smallest on hand.
Reassemble the radio, connect it to AC power and
antenna, and enjoy.
In the modified R7000, the scan and search rates are
still adjustable using the SCAN SPEED control. With
the control turned fully clockwise (maximum speed), the
modified R7000 scans at about 13 channels/second and
won't miss weak signals.
__________
1. Perhaps the firmware polls the scan rate input port
infrequently. Another possibility is that the scanning
pulses interrupt the processor, and the interrupt
firmware is limited in its ability to process frequent
interrupts.
CONTINUED IN FILE ICR7000.2
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