[ICOM] IC-2AT diode matrix question
Jack/AE7DX
vhfplus at bmg50.com
Mon Mar 21 10:31:29 EST 2005
K6STU at aol.com wrote:
>
>hi jack you are correct. there are only 4 diodes in the matrix. there are 4
>horizontal and 4 vertical lines that make up the matrix. the 4 vertical lines
>are from left to right are R10, R11, R12, and R13. the 4 horizontal lines
>are from top to bottom R23, R22, R21 and R20.
>it looks like a larger version of tick tack toe diagram.D407 consists of two
>diodes. Diode one The cathode/bar connects to line R23 and the Anode
>connects to R12. The second diode the Anode connects to R12 and the cathode/bar
>connects to R22. D402 the bar connects to R21 and the anode connects to R11.
>D403 the bar connects to R20 and the anode connects to R12.
> The diode matrix connects to the left side of IC 401 which is located
>above the speaker on the logic board. the pin out on on IC 401 is from top to
>bottom 65 through 80. 66/R10, 67/R11, 68/R12, 69/R13, 70/R20, 71/R21, 72/R22,
>73/R23.
> When you have the unit open with the speaker half on the left and the the
>other half that has the controls on the top look at he bottom left you will
>see the memory back up battery. Just to the lower left of this battery is the
>CPU reset switch. With the power switch on press the reset switch and this
>will reset the CPU.
>If this doesn't fix it I don't know what to tell you.
>Good Luck.
>Mike, K6STU
>
>
Mike:
The CPU reset did, in fact , work. I was able to give my son his first
QSO on 146.52 simplex. Unfortunately when I turned the rig off and then
back on later the '02AT was not functioning properly (same symptoms as
before the CPU reset). I have to assume that the memory backup battery
is not doing it's job and will have to be replaced.
Oh, well, at least I'm getting nearer the end of the saga. Thanks very
much for your assistance!
73,
Jack, AE7DX
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