KX1 power on problem

[Mike Scott-7]

My 3-band KX1 does not always come fully on when I hit the power switch.

I am plugged into external 14 VDC power. I also have the same symptoms on
battery power.

Symptoms are as follows:

Log lamp always works

Sometimes power comes on normally with the frequency shown in the display
and band noise and signals in the headphones.

Sometimes when I turn it on I hear noise, but not band noise and the display
remains dark. The noise right now is accompanied with a start up buzz that
fades to white noise with a dark display.

After a lot of power cycling when I am trouble shooting the KX1 starts up
every time and the start up buzz goes away and the display works.

One more symptom that is odd, I just used recall memory to tune to 7.040
MHz. I then cycled the power. The radio came up on 6.0691 MHz, it forgot the
last frequency used.

No matter what the prior frequency is the radio comes up at the following
frequencies:
40M -  6.0691
30M - 10.1068
20M - 14.0054

The buzzing noise makes me think an electrolytic is going somewhere.

I am not sure where to start, anyone have a pointer?

Mike Scott - AE6WA
Tarzana, CA (DM04 / near LA)
QRP-ARCI #12326/ KX1  #1311/ Swan 350C


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[Kurt Pawlikowski]

Mike,

    The first thing that usually comes up is the "standard" answer of
making sure all the solder joints are solid. Sometimes, just reheating
them will make the difference. It's possible that you do have some sort
of component failure, but I wouldn't expect it to be intermittent. That
is, most of the time something fails, it's dead. If you are unfortunate
enough to have a part that is static damaged, this sort of behavior is
possible (referring to the memory loss). I'm not sure I'd be thinking
filter cap (particularly if the noise is 60 cycle) since you get the
same thing on battery. Anyway, that's just a few quick thoughts. Hope it
helps. Let us know what you find.

    Regards,

    kurtt

    Kurt Pawlikowski, AKA WB9FMC
    The Pinrod Corporation
    [hidden email]
    [phone]
    http://pinrod.com

Mike Scott wrote:

> My 3-band KX1 does not always come fully on when I hit the power switch.
>
> I am plugged into external 14 VDC power. I also have the same symptoms on
> battery power.
>
> Symptoms are as follows:
>
> Log lamp always works
>
> Sometimes power comes on normally with the frequency shown in the display
> and band noise and signals in the headphones.
>
> Sometimes when I turn it on I hear noise, but not band noise and the display
> remains dark. The noise right now is accompanied with a start up buzz that
> fades to white noise with a dark display.
>
> After a lot of power cycling when I am trouble shooting the KX1 starts up
> every time and the start up buzz goes away and the display works.
>
> One more symptom that is odd, I just used recall memory to tune to 7.040
> MHz. I then cycled the power. The radio came up on 6.0691 MHz, it forgot the
> last frequency used.
>
> No matter what the prior frequency is the radio comes up at the following
> frequencies:
> 40M -  6.0691
> 30M - 10.1068
> 20M - 14.0054
>
> The buzzing noise makes me think an electrolytic is going somewhere.
>
> I am not sure where to start, anyone have a pointer?
>
> Mike Scott - AE6WA
> Tarzana, CA (DM04 / near LA)
> QRP-ARCI #12326/ KX1  #1311/ Swan 350C
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft   
>
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> Elecraft web page: http://www.elecraft.com
>
>  

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[Bob Waddell]

Mike,

In addition to checking soldering joints, double check carefully components on the board with the manual.  Yeah, I know, it's a pain but the only thing you can do.  Also check the battery plug on the board.  I had a problem with the type of wire they chose, as it would break easily if you took it in and out of the case too much.

Bob
N4BGR

> From: [hidden email]
> To: [hidden email]
> Date: Fri, 5 Oct 2007 13:31:09 -0700
> CC:
> Subject: [Elecraft] KX1 power on problem
>
> My 3-band KX1 does not always come fully on when I hit the power switch.
>
> I am plugged into external 14 VDC power. I also have the same symptoms on
> battery power.
>
> Symptoms are as follows:
>
> Log lamp always works
>
> Sometimes power comes on normally with the frequency shown in the display
> and band noise and signals in the headphones.
>
> Sometimes when I turn it on I hear noise, but not band noise and the display
> remains dark. The noise right now is accompanied with a start up buzz that
> fades to white noise with a dark display.
>
> After a lot of power cycling when I am trouble shooting the KX1 starts up
> every time and the start up buzz goes away and the display works.
>
> One more symptom that is odd, I just used recall memory to tune to 7.040
> MHz. I then cycled the power. The radio came up on 6.0691 MHz, it forgot the
> last frequency used.
>
> No matter what the prior frequency is the radio comes up at the following
> frequencies:
> 40M - 6.0691
> 30M - 10.1068
> 20M - 14.0054
>
> The buzzing noise makes me think an electrolytic is going somewhere.
>
> I am not sure where to start, anyone have a pointer?
>
> Mike Scott - AE6WA
> Tarzana, CA (DM04 / near LA)
> QRP-ARCI #12326/ KX1 #1311/ Swan 350C
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

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