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

[Mike Harris]

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" <olinger at bellsouth.net>
To: "Mike Harris" <mike.harris at cwimail.fk>
Cc: <elecraft at mailman.qth.net>
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 
> <mike.harris at cwimail.fk> wrote:
>
>> Yes.
>>
>>
>> ----- Original Message ----- From: "Guy Olinger K2AV" <
>> olinger at bellsouth.net>
>> To: "Mike Harris" <mike.harris at cwimail.fk>
>> Cc: <elecraft at mailman.qth.net>
>> 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 
>> <mike.harris at cwimail.fk>
>> wrote:
>>
>>> 13.8V from an Alinco DM-330MW switcher
>>>
>>> Mike VP8NO
>>>
>>> ----- Original Message ----- From: "Guy Olinger K2AV"
>>> <olinger at bellsouth.net>
>>> To: "Mike Harris" <mike.harris at cwimail.fk>
>>> Cc: <elecraft at mailman.qth.net>
>>> 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 
>>> <mike.harris at cwimail.fk>
>>> 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" <ericrosenberg.dc at gmail.com>
>>>> To: <elecraft at mailman.qth.net>
>>>> 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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