[Elecraft] K2 - KIO2 AUX I/O Install

[W4HDM]

Don,

     Thanks for your help, yes that was the problem ...my lack of
experience! After counting the pins the correct way the voltage is now
within specs with a -9.6.

My electronics building started just 2 days ago. I went to the local
electronics store (Fry's) and purchased a Hakko 936 soldering station and a
cheap sounds to lights kit to see if I was capable enough to continue. It
worked after assembly so I moved on to my K2 and built the 160m mod ... hey
it worked as well and looked pretty good! SO .. this KIO2 is my 3rd attempt
at building. Now that I have the pin counting down I'll proceed with crossed
fingers!

BTW ... at P4 on the control board where the AUX board will plug in, pin 9
(using your method) has been cut out and there is no wire going to it from
the tuner. Is this a normal mod and should I cut any of the pins from the
new AUX board? I assume it was cut to prevent some sort of short if it was
plugged into wrong?

Thanks again!

Damon 


-----Original Message-----
From: Don Wilhelm [mailto:w3fpr at embarqmail.com] 
Sent: Friday, February 13, 2009 6:12 PM
To: W4HDM
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K2 - KIO2 AUX I/O Install

Damon,

 From your description of the 'pin counting', I wonder if you counted 
correctly - an integrated circuit is numbered counterclockwise around 
the chip starting with pin 1 which is identified with a dot or a bar or 
a tapered edge or some distinguishing characteristic. Pin 8 is on the 
same side of the IC as pin 1, but at the opposite end.
The voltage at U1 pin 8 should be the same as the voltage on the anode 
of D1. If these are both positive voltages, about the only thing that 
could cause a problem like that is if D2 and D3 are installed backwards 
- check the orientation.

73,
Don W3FPR

W4HDM wrote:
>
> Hi All,
>
> I just finished building and installing the KIO2 and AUX2 Mods and 
> while dong the testing on page 11 (second from the bottom) ". Connect 
> the (-) lead ... positive to pin 8 of U1 on the KIO2 board. You should 
> see a negative reading of between -6 and - 12 VDC" I show positive 
> 5.02v and I am not sure how to proceed. I counted the pins from pin 
> one left to right top to bottom. Firmware ver. 2.04 & 1.09
>
> FYI this K2 was a K2/100 and the KIO2 was installed with the amp. So 
> the control board mod on page 10 was done when I received the rig. I 
> removed the amp and now use the K2 as QRP. I am installing a new KIO2 
> kit so that I can eventually install the amp in the EC2 or 100w Tuner 
> as well as have pc control capabilities.
>
> Any help is appreciated . Thanks!
>
> Damon-W4HDM-K2-#473
>
> * *
>
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