[Elecraft] KRC2 trouble shooting

[Brett Howard]

>From what I read in the K3 manual pin 6 is DIGOUT0 which the manual
states will be 0V when you select TRN or HF-TRN and are in low power
mode.  At all other times that pin is Hi-Z.  So no connecting to that
pin would not have broken anything in your KRC2.

Looks like the only LED in the system is micro-controller controlled
so a lot of things could make that not come on.

Lets start with the easy stuff is there +5V on pin 3 of U3?
If you have a scope look at pins 13 and 14 of U1 and see if you have 4Mhz there.

I've never used (or even seen a KRC2) so I'm kinda flying blind...
Are you sure that however you're powering it has the polarity right?
Sorry for asking the stupid questions but sometimes they help.  I do
this stuff a lot and you have no idea how many times my wife asking
the question of do you have it plugged in has fixed my problems! ;)

On Tue, Mar 16, 2010 at 12:24 PM, Kazunori Watanabe <jk3gad at mac.com> 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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