[Elecraft] K2 Initial Tests

[Brian Denley]

Don:
Yes D5 was backwards.  I was not able to save the diode during removal,
mainly because it was too near the knobs and switches and I have already
melted and replaced one of each.  I ended up cutting the diode leads on top
and just desoldering the leads from the bottom.  I ordered a replacement
diode but I was hoping that the same diode was used elsewhere on the K2 or
accessories and I could 'borrow' one until the replacement came.  No such
luck as it is not used anywhere else on the K2.  I will just have to wait
unitl the part arrives but I feel pretty confident that D5 was the cause of
my troubles.
Thanks again!

Brian
http://home.comcast.net/~b.denley/index.html


----- Original Message ----- 
From: "Don Wilhelm" <w3fpr at embarqmail.com>
To: "Brian Denley" <b.denley at comcast.net>
Cc: <don at w3fpr.com>; "Elecraft Reflector" <elecraft at mailman.qth.net>
Sent: Sunday, June 27, 2010 4:07 PM
Subject: Re: [Elecraft] K2 Initial Tests


> Brian,
>
> In the back of the manual, you will find a parts placement diagram that 
> clearly shows the orientation of the diodes.  Use that for reference 
> rather than a photo - it is easier.
>
> Yes, D5 installed backwards could cause the buttons to not function, and 
> may also create other "funny happenings".
>
> 73,
> Don W3FPR
>
> Brian Denley wrote:
>> Don:
>> After poking around, I am leading toward D5 of the Front Panel board 
>> installed backwards.  From the schematic, this would prevent bank 1 of 
>> the switches and the power knob from functioning properly and would, I 
>> think, also affect the keyer operation.  I have looked for a photo of 
>> this board on the Elecraft site but the one they have is the 1999 board. 
>> If that circuit hasn't changed then D5 is indeed backwards.  I can't see 
>> the silkscreen patterm on my board anymore as the diode covers it too 
>> well and it is too stiff to move.  From the schematic, however, I am sure 
>> it's backwards.
>> Thanks again for your help!
>> Brian
>> http://home.comcast.net/~b.denley/index.html
>>
>>
>> ----- Original Message ----- 
>> From: "Don Wilhelm" <don at w3fpr.com>
>> To: "Brian Denley" <b.denley at comcast.net>
>> Sent: Sunday, June 27, 2010 10:48 AM
>> Subject: Re: [Elecraft] K2 Initial Tests
>>
>>
>>
>>> Brian,
>>>
>>> You didn't say anything about the buttons not working before.  First 
>>> step is to re-flow the soldering on the entire front panel.
>>>
>>> 73,
>>> Don W3FPR
>>>
>>> Brian Denley wrote:
>>>
>>>> Don:
>>>> Thanks and I will resolder those connections but it bothers me that 
>>>> none of the buttons respond at all.  Only the encoder seems to work 
>>>> properly.
>>>> Brian Denley
>>>> http://home.comcast.net/~b.denley/index.html
>>>>
>>
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