[Elecraft] KAT100 project - removing the control board

[Don Wilhelm]

Stan,

If there is nothing wrong, it is "plug and play", but you obviously have 
a problem somewhere.

Yes, do check the KAT100 control cable.  And please don't think of it as 
an RS-232 cable at all, it is a cable that happens to use connectors 
like a PC serial port, but it is 'just a 9 pin connector' - it contains 
internal K2 signal lines - yes, the tail to the computer contains the 
RS-232 TXD and RXD signals as well as signal ground, but the cable to 
the KAT100 contains only the internal K2 signal lines.

With the information you gave, the KAT100 is not being recognized, and I 
suspect the AUXBUS signal line.  That could be a fault in the external 
cable or a fault in the cable between the K2 Control Board and the KIO2 
or RFC1 in the KAT100 or L1 in the KIO2.  It would be best to do a full 
end to end resistance check from the Control Board end to the KAT100 end 
on pins 2, 4, 6, 8, and 10 - plug the control cable into both the K2 CB 
and the KAT100 and check from K2  Control Board P4 pin 2 to KAT100 
position for P4 pin 2. (pin 2 is opposite pin 1 and pin 1 has a round 
solder pad)  continue with  pins 4, 6, and 8.

It may be difficult to get to the pins on the back of Control Board P4, 
so you will have to tilt the Control Board forward.  Remove the KDSP2 by 
pulling off the top board (use good anti-static measures), then remove 
the screw in the middle of the lower board.  Pull the KDSP2 board toward 
the rear of the K2 and it will come free - remove the standoff that 
holds the KDSP2 and remove the screw holding the other end of the 
Control Board from the front panel standoff (peer down between the front 
panel and control board to see the standoff).  The control board can now 
be tilted forward far enough to probe the solder side of P4.  If it is 
still too tight for you, remove the 4 remaining screws holding the front 
panel to the K2 and pull the front panel assembly forward to remove it 
and give you full access to the solder side of the Control Board.

73,
Don W3FPR

On 5/5/2013 1:41 PM, Stan AE7UT wrote:
> Thanks Don.
>
> So just "plug and play"?
>
> I hooked it up and the Ant 1 lights up and the Low power range lights up.
> It won't switch antennas and it looks like the K2 is not "seeing" it.
> When I go to the ATU menu setting and try to engage the ATU is says:
> PA Ant1  - then goes back to the ATU --
>
> I'm going to check my RS232 cable.
> Any other thoughts?
>
> Thanks
> Stan
>
>
>
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