[Elecraft] KRC2 trouble shooting

[Jack Brindle]

It appears that the MCU is not getting power. Go back and recheck your solder joints - something is definitely amiss. Go through the voltage check table to make sure the voltages on the important pins (usually the power pins) are correct.

Note that you probably will not be able to load software into the MCU at this time. The LED is a very simple indication that the MCU is active and will be illuminated if anything is working. Since it is dark, nothing is. Thus the suggestion to recheck the voltages. I suspect the voltage regulator or something else on the power rail.

Jack Brindle, W6FB
Elecraft Engineering


On Mar 16, 2010, at 5:09 PM, Don Wilhelm wrote:

> Kazu,
> 
> Try re-doing the tests on page 15 of the KRC2 manual.  If those tests 
> are not successful, try loading the KRC2 firmware (download available 
> from the Elecraft website).  You would need the KRC2 Download Program 
> loaded onto your PC and the actual firmware file to be loaded from the 
> PC - KRC2 Firmware 1.5.
> 
> If the firmware load fails, then you need to look for the problem in the 
> KRC2.  The usual advice of "Check soldering, then re-check the 
> soldering, and when that is finished, check the soldering" applies.  It 
> may be that the firmware chip itself has failed, but hold on that 
> conclusion until you have tried the soldering check and attempted 
> another frimware download.
> 
> If all of the above fails, then you may have damaged outputs on the 
> firmware chip itself and you will have to order a new chip.
> 
> 73,
> Don W3FPR
> 
> Kazunori Watanabe wrote:
>> Hello, 
>> 
>> I just completed KRC2, initial test in page 15 of manual was successful. 
>> Now completed final assembly and connect to K3 using AuxBus, turn 
>> on 12V, LED does not turn on, K3 does not recognise KRC2. 
>> Later I realised I should connect GND on pin 5 of K3 side, instead of 
>> pin 6, which "KCR2" Manual Errata Rev C-2 Feb 11, 2009 instructed 
>> me to do so. 
>> Is there any possibility I damaged KRC2 because of this error? 
>> After disconnect all cable and put 12V, still no LED light and no output. 
>> 
>> 73 de Kazu  JK3GAD/M0CFW
>> 
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