Lost speaker audio in K2

[Steve Kallal]

I just lost the speaker audio in my K2/100, but still have audio through the
headphone jack. Switching to the regular cover and speaker doesn't help.
Looking at the schematics, it looks like the headphone jack could be faulty.
The speaker audio runs through the headphone jack and bypasses the speaker
when a headphone is plugged in. It looks like the headphone isn't returning
the audio back to the speaker line when the headphone plug is removed.
 
Has anyone else encountered this problem?
 
73,
 
Steve N6VL

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[Don Wilhelm-4]

Steve,

Most likely the isolated contacts in your headphone jack have failed.
That failure has been discussed many times in the past.
If you are using a 1/8 inch to 1/4 inch adapter on the headphone jack,
don't do that anymore, the weight of an adapter exerting side forces on
the headphone jack is suspected to cause pre-mature failure.  Build or
buy a short stereo extension cable and put the adapter on the cable.  A
right angle 1/8 inch jack at the K2 end may be a help.
For some reason, a few folks have experienced multiple failures of the
headphone jack while others had had no problem at all.  The real reason
remains a mystery to me.

73,
Don W3FPR

Steve Kallal wrote:
> I just lost the speaker audio in my K2/100, but still have audio through the
> headphone jack. Switching to the regular cover and speaker doesn't help.
> Looking at the schematics, it looks like the headphone jack could be faulty.
> The speaker audio runs through the headphone jack and bypasses the speaker
> when a headphone is plugged in. It looks like the headphone isn't returning
> the audio back to the speaker line when the headphone plug is removed.
>
>  
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[drewko]

My headphone jack failed in short order. I am constantly jumping back
and forth between headphones & speaker, so the mini-jacks don't stand
a chance with me for very long.

When I got a new jack from Elecraft I decided to add a
headphone/speaker switch to the back panel; now I leave the headphones
plugged in all the time and use the switch to go back and forth. This
is a wonderful mod. It fixed the one truly annoying feature of the K2
(to me, at least).

When I replaced the jack I bent the center front (ground) conductor
flat; one pair of switch contacts are soldered to this contact and the
now vacant PCB trace beneath it (with a sliver of fishpaper between
switch and board for insulation); the other pair to the back contacts
of the jack... well, you can figure it out from the circuit.  I routed
the 4-conductor cable along the front of the control board, toward the
on/off switch; there is a space there where the round cable can get
past the board.

Anyhow, it is so conveniet to be able to switch the audio from
headphone to speaker as often as I want, without having to fiddle with
the tiny ill-fitting plug, and always wondering when the jack is going
to die again.

Next project: fixed level audio output for recording my QSOs.

73,
Drew
AF2Z


On Tue, 11 Sep 2007 22:57:24 -0700, you wrote:

>I just lost the speaker audio in my K2/100, but still have audio through the
>headphone jack. Switching to the regular cover and speaker doesn't help.
>Looking at the schematics, it looks like the headphone jack could be faulty.
>The speaker audio runs through the headphone jack and bypasses the speaker
>when a headphone is plugged in. It looks like the headphone isn't returning
>the audio back to the speaker line when the headphone plug is removed.
>
>Has anyone else encountered this problem?
>
>73,
>
>Steve N6VL
>

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