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ICW2A.1
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1992-09-15
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ICW2A.1
At this time the back side of the front panel is clearly accessible and
the two CPU's are visible side-by-side across the top. Now refer to
the following illustration:
Top of Radio, Back side of Front Panel
_____________________________________________________
!
-------- -------- !
! ! ! ! !---
! CPU-1 ! ! CPU-2 ! ! !
! ! ! ! ! P !
-------- -------- ! T !
! T !
-------- ! !
-------- !---
.<: <-D1 ---------- !
.. ! !fuse ! ! !
D2-> V ---------- !
.. !
D3-> V !
.. !
V <-D? !
!
D1, D2 and D3 are locations on the board. Only D2 is installed
at the factory. To perform the mod, you must do the following:
Remove D2
Install D1
Install D3
The locations of D1 and D3 are clearly silk screened onto the circuit
board and are easy to locate. Don't attempt to re-use D2. The periods
(..) show the approximate location of the solder pads for the 2-legged
sides of the diodes.
Diode D2 may be removed by carefully heating the leads and prying it up
using a sharp tool. Be very careful since it's easy to lift the solder
pads.
One method of installing diodes D1 and D3 is to use a very small drop
of super glue to mount the part, and then use a soldering iron to tack
down the pins.
After the parts are installed, reassemble the radio. Although the
manufacturer recommends that the microprocessor be reset after this
mod, I have found it to be unnecessary. All memories retained their
settings after the mod. Tests using a dummy load and a frequency
counter showed TX ability on UHF from under 400MHz to over 490MHz.
TX on VHF covers from 136MHz to 174MHz.
73's,
-fred AA7BQ
=======================================================
I haven't tried or verified this, proceed at your own risk. WA2ISE
And don't transmit out of legal bands!