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K3 LEDs light up, but won't come to life

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Eric Rosenberg

K3 LEDs light up, but won't come to life

thi has happened three times:

I turn on the K3, the LEDs on the four knobs under the display light up, but
the display stays dark and I cannot power it off with the power button.

I have to disconnect the power, wait a little bit and re-connect the radio.
It comes back to life when I power it on.

What's happening?

Eric W3DQ
Washington, DC
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Mike Harris

Re: K3 LEDs light up, but won't come to life

Hi,

I've started to notice this in the past couple of months. I turn
the PSU off for a few seconds, then back on and all is OK. It has
happened maybe a dozen times.

Regards,

Mike VP8NO

----- Original Message -----
From: "Eric Rosenberg" <[hidden email]>
To: <[hidden email]>
Sent: Tuesday, November 23, 2010 5:49 PM
Subject: [Elecraft] K3 LEDs light up, but won't come to life

> thi has happened three times:
>
> I turn on the K3, the LEDs on the four knobs under the display
> light up, but
> the display stays dark and I cannot power it off with the power
> button.
>
> I have to disconnect the power, wait a little bit and re-connect
> the radio.
> It comes back to life when I power it on.
>
> What's happening?
>
> Eric W3DQ
> Washington, DC

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Guy, K2AV

Re: K3 LEDs light up, but won't come to life

What is the power supply supply voltage? 73, Guy.

On Tue, Nov 23, 2010 at 3:58 PM, Mike Harris <[hidden email]> wrote:

> Hi,
>
> I've started to notice this in the past couple of months. I turn
> the PSU off for a few seconds, then back on and all is OK. It has
> happened maybe a dozen times.
>
> Regards,
>
> Mike VP8NO
>
> ----- Original Message -----
> From: "Eric Rosenberg" <[hidden email]>
> To: <[hidden email]>
> Sent: Tuesday, November 23, 2010 5:49 PM
> Subject: [Elecraft] K3 LEDs light up, but won't come to life
>
>
>> thi has happened three times:
>>
>> I turn on the K3, the LEDs on the four knobs under the display
>> light up, but
>> the display stays dark and I cannot power it off with the power
>> button.
>>
>> I have to disconnect the power, wait a little bit and re-connect
>> the radio.
>> It comes back to life when I power it on.
>>
>> What's happening?
>>
>> Eric W3DQ
>> Washington, DC
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

Mike Harris

Re: K3 LEDs light up, but won't come to life

13.8V from an Alinco DM-330MW switcher

Mike VP8NO

----- Original Message -----
From: "Guy Olinger K2AV" <[hidden email]>
To: "Mike Harris" <[hidden email]>
Cc: <[hidden email]>
Sent: Tuesday, November 23, 2010 6:04 PM
Subject: Re: [Elecraft] K3 LEDs light up, but won't come to life

What is the power supply supply voltage? 73, Guy.

On Tue, Nov 23, 2010 at 3:58 PM, Mike Harris
<[hidden email]> wrote:

Guy, K2AV

Re: K3 LEDs light up, but won't come to life

Is that what you read on the K3 front panel display?

On Tue, Nov 23, 2010 at 4:20 PM, Mike Harris <[hidden email]> wrote:

> 13.8V from an Alinco DM-330MW switcher
>
> Mike VP8NO
>
> ----- Original Message ----- From: "Guy Olinger K2AV"
> <[hidden email]>
> To: "Mike Harris" <[hidden email]>
> Cc: <[hidden email]>
> Sent: Tuesday, November 23, 2010 6:04 PM
> Subject: Re: [Elecraft] K3 LEDs light up, but won't come to life
>
>
> What is the power supply supply voltage? 73, Guy.
>
> On Tue, Nov 23, 2010 at 3:58 PM, Mike Harris <[hidden email]> wrote:
>>
>> Hi,
>>
>> I've started to notice this in the past couple of months. I turn
>> the PSU off for a few seconds, then back on and all is OK. It has
>> happened maybe a dozen times.
>>
>> Regards,
>>
>> Mike VP8NO
>>
>> ----- Original Message -----
>> From: "Eric Rosenberg" <[hidden email]>
>> To: <[hidden email]>
>> Sent: Tuesday, November 23, 2010 5:49 PM
>> Subject: [Elecraft] K3 LEDs light up, but won't come to life
>>
>>
>>> thi has happened three times:
>>>
>>> I turn on the K3, the LEDs on the four knobs under the display
>>> light up, but
>>> the display stays dark and I cannot power it off with the power
>>> button.
>>>
>>> I have to disconnect the power, wait a little bit and re-connect
>>> the radio.
>>> It comes back to life when I power it on.
>>>
>>> What's happening?
>>>
>>> Eric W3DQ
>>> Washington, DC
>
>

Mike Harris

Re: K3 LEDs light up, but won't come to life

Yes.

----- Original Message -----
From: "Guy Olinger K2AV" <[hidden email]>
To: "Mike Harris" <[hidden email]>
Cc: <[hidden email]>
Sent: Tuesday, November 23, 2010 6:28 PM
Subject: Re: [Elecraft] K3 LEDs light up, but won't come to life

Is that what you read on the K3 front panel display?

On Tue, Nov 23, 2010 at 4:20 PM, Mike Harris
<[hidden email]> wrote:

> 13.8V from an Alinco DM-330MW switcher
>
> Mike VP8NO
>
> ----- Original Message ----- From: "Guy Olinger K2AV"
> <[hidden email]>
> To: "Mike Harris" <[hidden email]>
> Cc: <[hidden email]>
> Sent: Tuesday, November 23, 2010 6:04 PM
> Subject: Re: [Elecraft] K3 LEDs light up, but won't come to life
>
>
> What is the power supply supply voltage? 73, Guy.
>
> On Tue, Nov 23, 2010 at 3:58 PM, Mike Harris
> <[hidden email]> wrote:
>>
>> Hi,
>>
>> I've started to notice this in the past couple of months. I turn
>> the PSU off for a few seconds, then back on and all is OK. It has
>> happened maybe a dozen times.
>>
>> Regards,
>>
>> Mike VP8NO
>>
>> ----- Original Message -----
>> From: "Eric Rosenberg" <[hidden email]>
>> To: <[hidden email]>
>> Sent: Tuesday, November 23, 2010 5:49 PM
>> Subject: [Elecraft] K3 LEDs light up, but won't come to life
>>
>>
>>> thi has happened three times:
>>>
>>> I turn on the K3, the LEDs on the four knobs under the display
>>> light up, but
>>> the display stays dark and I cannot power it off with the power
>>> button.
>>>
>>> I have to disconnect the power, wait a little bit and re-connect
>>> the radio.
>>> It comes back to life when I power it on.
>>>
>>> What's happening?
>>>
>>> Eric W3DQ
>>> Washington, DC

Guy, K2AV

Re: K3 LEDs light up, but won't come to life

Just covering some bases... Put an AC voltmeter on the DC leads from the
switching supply and make sure any AC voltage is way way down in the
millivolts. Light load, heavy load, no load. 73, Guy.

On Tue, Nov 23, 2010 at 6:44 PM, Mike Harris <[hidden email]> wrote:

> Yes.
>
>
> ----- Original Message ----- From: "Guy Olinger K2AV" <
> [hidden email]>
> To: "Mike Harris" <[hidden email]>
> Cc: <[hidden email]>
> Sent: Tuesday, November 23, 2010 6:28 PM
>
> Subject: Re: [Elecraft] K3 LEDs light up, but won't come to life
>
>
> Is that what you read on the K3 front panel display?
>
>
> On Tue, Nov 23, 2010 at 4:20 PM, Mike Harris <[hidden email]>
> wrote:
>
>> 13.8V from an Alinco DM-330MW switcher
>>
>> Mike VP8NO
>>
>> ----- Original Message ----- From: "Guy Olinger K2AV"
>> <[hidden email]>
>> To: "Mike Harris" <[hidden email]>
>> Cc: <[hidden email]>
>> Sent: Tuesday, November 23, 2010 6:04 PM
>> Subject: Re: [Elecraft] K3 LEDs light up, but won't come to life
>>
>>
>> What is the power supply supply voltage? 73, Guy.
>>
>> On Tue, Nov 23, 2010 at 3:58 PM, Mike Harris <[hidden email]>
>> wrote:
>>
>>>
>>> Hi,
>>>
>>> I've started to notice this in the past couple of months. I turn
>>> the PSU off for a few seconds, then back on and all is OK. It has
>>> happened maybe a dozen times.
>>>
>>> Regards,
>>>
>>> Mike VP8NO
>>>
>>> ----- Original Message -----
>>> From: "Eric Rosenberg" <[hidden email]>
>>> To: <[hidden email]>
>>> Sent: Tuesday, November 23, 2010 5:49 PM
>>> Subject: [Elecraft] K3 LEDs light up, but won't come to life
>>>
>>>
>>> thi has happened three times:
>>>>
>>>> I turn on the K3, the LEDs on the four knobs under the display
>>>> light up, but
>>>> the display stays dark and I cannot power it off with the power
>>>> button.
>>>>
>>>> I have to disconnect the power, wait a little bit and re-connect
>>>> the radio.
>>>> It comes back to life when I power it on.
>>>>
>>>> What's happening?
>>>>
>>>> Eric W3DQ
>>>> Washington, DC
>>>>
>>>
>

Mike Harris

Re: K3 LEDs light up, but won't come to life

G'day,

Less than 20mV in all circumstances as measured on my Fluke 8020B.
Unfortunately I don't have a 'scope so I can't look at the frequency
component. I used to have access to an earth stations worth of
fancy test equipment so never bought my own!

I really don't think it is a PSU issue. Something is stalling the
logic, maybe not enough time for internal supplies or logic states
to settle before ignition sequence starts.

Regards,

Mike VP8NO

----- Original Message -----
From: "Guy Olinger K2AV" <[hidden email]>
To: "Mike Harris" <[hidden email]>
Cc: <[hidden email]>
Sent: Wednesday, November 24, 2010 3:36 AM
Subject: Re: [Elecraft] K3 LEDs light up, but won't come to life

> Just covering some bases... Put an AC voltmeter on the DC leads
> from the
> switching supply and make sure any AC voltage is way way down in
> the
> millivolts. Light load, heavy load, no load. 73, Guy.
>
> On Tue, Nov 23, 2010 at 6:44 PM, Mike Harris
> <[hidden email]> wrote:
>
>> Yes.
>>
>>
>> ----- Original Message ----- From: "Guy Olinger K2AV" <
>> [hidden email]>
>> To: "Mike Harris" <[hidden email]>
>> Cc: <[hidden email]>
>> Sent: Tuesday, November 23, 2010 6:28 PM
>>
>> Subject: Re: [Elecraft] K3 LEDs light up, but won't come to life
>>
>>
>> Is that what you read on the K3 front panel display?
>>
>>
>> On Tue, Nov 23, 2010 at 4:20 PM, Mike Harris
>> <[hidden email]>
>> wrote:
>>
>>> 13.8V from an Alinco DM-330MW switcher
>>>
>>> Mike VP8NO
>>>
>>> ----- Original Message ----- From: "Guy Olinger K2AV"
>>> <[hidden email]>
>>> To: "Mike Harris" <[hidden email]>
>>> Cc: <[hidden email]>
>>> Sent: Tuesday, November 23, 2010 6:04 PM
>>> Subject: Re: [Elecraft] K3 LEDs light up, but won't come to life
>>>
>>>
>>> What is the power supply supply voltage? 73, Guy.
>>>
>>> On Tue, Nov 23, 2010 at 3:58 PM, Mike Harris
>>> <[hidden email]>
>>> wrote:
>>>
>>>>
>>>> Hi,
>>>>
>>>> I've started to notice this in the past couple of months. I
>>>> turn
>>>> the PSU off for a few seconds, then back on and all is OK. It
>>>> has
>>>> happened maybe a dozen times.
>>>>
>>>> Regards,
>>>>
>>>> Mike VP8NO
>>>>
>>>> ----- Original Message -----
>>>> From: "Eric Rosenberg" <[hidden email]>
>>>> To: <[hidden email]>
>>>> Sent: Tuesday, November 23, 2010 5:49 PM
>>>> Subject: [Elecraft] K3 LEDs light up, but won't come to life
>>>>
>>>>
>>>> thi has happened three times:
>>>>>
>>>>> I turn on the K3, the LEDs on the four knobs under the display
>>>>> light up, but
>>>>> the display stays dark and I cannot power it off with the
>>>>> power
>>>>> button.
>>>>>
>>>>> I have to disconnect the power, wait a little bit and
>>>>> re-connect
>>>>> the radio.
>>>>> It comes back to life when I power it on.
>>>>>
>>>>> What's happening?
>>>>>
>>>>> Eric W3DQ
>>>>> Washington, DC
>>>>>
>>>>
>>
>

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______________________________________________________________
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