[Elecraft] [K3] S/N3050 RS232 port has no response

[Pete Smith]

The advice I received from tech support was to check the KIO3 "daughter 
board" for any open circuits, and then to check U1 on the KIO3A I/O 
board.  It is a small surface mount chip, very common, and if you can 
try to replace it I would, because a replacement board is $115 plus 
shipping.  I just went through that!

I have now added a Tripplite DB-9 surge protector to the RS-232 port of 
my K3, and made very sure that the computer and radio are connected to a 
common ground.  I think that the surge protector would be a useful 
adjunct for any K3 - for $20 plus shipping it's a lot cheaper than 
rteplacing the IO board.

73, Pete N4ZR

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On 7/29/2010 3:20 AM, je1trv at a1club.net wrote:
> Dear Elecrafters!
> Since few days ago, my K3 (S/N3050) has no response from its RS232 port.
> First no frequency data became obtained by Logger32.
> Then, I tried to connect by K3 Utility, I tried port refresh, port
> test,etc. But no reply from the K3.
> I confirmed K3 Utility program is sending polling signal to K3 RS232 port
> but seems no reply from K3.
>
> I use USB/RS232 converter between P/C and the rig.
> I changed the connection with other rig such as FT-2000, and it works
> without problem using same com port, so that I'm sure the RS232 of K3 is
> something wrong.
>
> I'm afraid if K3 got a kind of surge damage because we had a bad wx with
> lightening just before the reported malfunction occur.
>
> I posted same question to tech support but if anyone had same problem
> please advise how to fix this problem.
>
> vy 73
> Atsu, JE1TRV from Tokyo Japan
>
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