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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