[Elecraft] K2 headphone jack pinout ?

[Steve Kavanagh]

Thanks, Don. Shorting those two pads together with a screwdriver brought the speaker back to life, confirming the "standard" failure.  Now I can decide what to do about it! 73,Steve VE3SMA     From: Don Wilhelm <don at w3fpr.com>
 To: Steve Kavanagh <skavanagh72 at yahoo.ca>; "elecraft at mailman.qth.net" <elecraft at mailman.qth.net> 
 Sent: Friday, June 26, 2015 10:25 PM
 Subject: Re: [Elecraft] K2 headphone jack pinout ?
  
Steve, with the front panel facing you and the K2 "on its back".

73,
Don W3FPR

On 6/26/2015 9:23 PM, Steve Kavanagh wrote:
> Thanks for the quick reply, Don! When you say "the solder pad to the right " do you mean with the front panel facing me, or with the front panel away from me?  I was thinking I might try something like that - maybe adding a speaker switch. 73,Steve VE3SMA
>        From: Don Wilhelm <w3fpr at embarqmail.com>
>  To: Steve Kavanagh <skavanagh72 at yahoo.ca>; "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
>  Sent: Friday, June 26, 2015 7:57 PM
>  Subject: Re: [Elecraft] K2 headphone jack pinout ?
>    
> Steve,
>
> An examination of the headphone jack connections in the K3 schematic
> should answer your question.  The switch that activates/deactivates the
> speaker is completely isolated from the contacts that provide headphone
> audio through resistors R35 and R36.
> There is a plastic lever inside the headphone jack which activates that
> switch - and the operating lever for that switch does break occasionally.
> Efforts by Elecraft to encourage the jack manufacturer to beef up that
> operating lever have met with failure.
>
> If you wish to effect a temporary fix, open the bottom panel of the K2
> and look at the rearmost 3 solder pads on the headphone jack. Solder a
> wire from the center pad to the solder pad to the right (looking at the
> bottom of the board.  That will make the speaker active at all times.
> If you want to silence the speaker, plug a bare 3.5mm plug into the
> External Speaker jack on the rear panel.
>
> For full instructions on how to replace the headphone jack on your K2,
> look at my instructions to WY3A at
> http://www.qsl.net/wy3a/Replace_K2_Headphone_Jack.htm.  Thanks to Bill
> for posting those instructions.
>
> 73,
> Don W3FPR
>
>
>
>
> On 6/26/2015 7:19 PM, Steve Kavanagh wrote:
>> I think one of my K2s has suffered the dreaded headphone jack failure (no speaker or speaker jack output - headphones work fine).  To confirm this diagnosis (and perhaps to make mods to prevent it happening again) I'd like to get my hands on the pinout of the headphone jack J2.  I was surprised I couldn't find a link when searching through the list archives.  Has anyone got this info?  Which pins are the speaker switch? 73,Steve VE3SMA
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