[Elecraft] K2 - KIO2 connected under power - now it is dead

[Charles Bland]

Andreas,

Having had this happen to me, here are a couple of postings from my 
experiences.

My Therapist says sharing about this help me..............

-----------------------Message 1 ---------------------
You know those 9-pin Null MODEM adapters you can get?

Don't plug one in to your KIO2. You will have to do what I'm 
doing.....

Buy a new main MPU.

But at least I'm experimenting!!!!!!!!

Chuck

-------Message 2 ------------------------------------------
Gang,

While working out the details of a serial interface cable between my 
Handspring Visor and K2 (trying-out Pat K0PC logging program - 
cool! try it!) I apparently made my K2 unhappy.

I must have got across one of the wrong lines on the KIO2 
connector. As a result, I ended-up with NO output from the K2 at 
all.

Short story: I popped a pin on the main MCU and had to replace 
the MCU.

Moral of the story: When doing a serial interface, only  use pins 
1,2,3, and 5. Stay off the rest.

Chuck Bland - n6dbt
#1924 +/- a main MCU.
------------end of messages--------------------

Note Andreas KU7T's stunning brilliance and Chuck's apt reply (gack!)

From:           	"Andreas KU7T" <ku7t@ku7t.org>
To:             	<elecraft@mailman.qth.net>
Subject:        	[Elecraft] K2 - KIO2 connected under power - now it is dead
Date sent:      	Tue, 17 Jun 2003 00:02:22 -0700

> Hi,
> 
> I built the KIO2 and it worked rigth from the beginning, as in good Elecraft tradition.  
> 
> Then, I tried to remote the KPA100/KAT100 and as soon as I plugged the cable in there was a strange smell and nothing worked anymore. I am running on battery, so I think I plugged in under power.  Well, probably not a good thing but I did it.  
> 
> Now, moving to the troubleshooting section:
> 
> - I cannot hear the crystal oscillator on the KIO2 (with an external general coverage receiver).
> - Doing the Voltage checks, most of the positive voltages are 0 
> - I find that the main DC 12V wire J2-8 is 0 V as well.  Does this mean I nuked something on the control board? Where would I start looking here? 
> 
> 
> Any further ideas/tips are very much appreciated.  I sure hope, I get that running again for FD.
> 
> 
> 73, 
> Andreas, KU7T
> 
> 
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