KI02

[KR4OW]

Hello All
My KI02 is not communicating with the computer.
I put it in my other K2 and it works ok.
I found that I do not have the 5 volts at the RXD Line (Pin 26) U6 Actual (.54v)
I found that I have 1.37 volts at TXD Line (Pin 25) U6 when it should be 0
I have the 5 volts going into the resitor pack rp7 Pin 3 but not at pin 4
So I figured that the pack is opened but I get a shorted reading between pin 3 and pin 4
of rp7. Schematic gives the 2 pins 33k I do not know it this is correct. I do not see any other parallel circuits across these pins.
But not knowing the make up of the 2 IC's, I cannot know if this is normal.
Thanks David KR4OW
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[Don Wilhelm-4]

David,

Remove the KIO2 cable from the Control Board and try those measurements
again.
Compare with your other K2 to obtain a sanity check.

It may be that you had a surge that damaged the pin 26 input of CB U6.

Are you certain PORT is set to ON?

73,
Don W3FPR

On 9/6/2011 12:50 PM, David N. wrote:

> Hello All
> My KI02 is not communicating with the computer.
> I put it in my other K2 and it works ok.
> I found that I do not have the 5 volts at the RXD Line (Pin 26) U6 Actual (.54v)
> I found that I have 1.37 volts at TXD Line (Pin 25) U6 when it should be 0
> I have the 5 volts going into the resitor pack rp7 Pin 3 but not at pin 4
> So I figured that the pack is opened but I get a shorted reading between pin 3 and pin 4
> of rp7. Schematic gives the 2 pins 33k I do not know it this is correct. I do not see any other parallel circuits across these pins.
> But not knowing the make up of the 2 IC's, I cannot know if this is normal.
> Thanks David KR4OW
>

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