Elecraft

No output - internal spkr - K2/100

Classic

List

Threaded

7 messages Options

n8ewy

No output - internal spkr - K2/100

Howdy .. My real problem is that when there are no headphones plugged into
the front and nothing hooked to the "ext spkr" in the back I'm not getting
anything through the onboard spkr in my K2/100. This is true of the spkr in
the QRP lid as well when swapped out. This happened suddenly last evening.
The internal speaker was working fine, and then I noticed it wasn't working
later in the evening.

The "ext spkr" is producing no audio now. This is true of the KPA top and
the QRP top. The lack of audio in the internal speaker and the "ext spkr"
jack in the back are tied together I'm sure. I get a nice waterfall in say
HanScope when the audio is taken from the headphone jack in the front of the
K2/100. If I then switch back to the "ext spkr" in the rear there is no
sign of audio present in the HamScope waterfall. No audio at the internal
speaker on the way up to plug into the rear ext spkr jack either.

Any ideas why my ext spkr jack in the back of my KPA100 would just stop
working? I plugged the QRP top back on with the speaker hooked up. The
same thing so it's not the jack itself. No audio through the internal
speaker or "ext spkr" jack but the headphones at the headphone jack in the
front works fine.

Thank you in advance for any ideas you might have.

Dohn

N8EWY

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Don Wilhelm-3

RE: No output - internal spkr - K2/100

Dohn,

With headphones OK, but speaker not working, there are 4 things to check.
First, check to see if you mistakenly plugged the speaker into the P5 header
on the control board - the speaker plugs onto the RF Board.

Second, have the crimp pins in the speaker connector been pushed back into
the housing? The pins must be inserted properly and will lock into place if
done correctly, many builders have trouble with inserting the pins.

Third, is the speaker cable wired backwards? On the QRP top, the copper
wire should connect to pin 1 of RF Board P5 and the non-grounded lug of the
external speaker jack - the KPA100 is opposite in that the tinned wire is
connects to P5 pin 1 and the non-grounded side of the AF path on the KPA100
board.

Forth, check the soldering of the headphone jack, especially the 3 pins
toward the back (these are the switch contacts.

If you think the headphone jack switch may defective, you can check the
resistance from RF Board J8 pin 7 to RF Board P5 pin 1 - this path should
measure close to zero ohms with the headphones removed (if the headphone
jack switch is OK).

Since your speaker 'just quit' after it was working, I would think the first
3 items may be OK,so check the 4th one first - check the soldering first and
then do the continuity check.

73,
Don W3FPR

> -----Original Message-----
>
> Howdy .. My real problem is that when there are no headphones plugged into
> the front and nothing hooked to the "ext spkr" in the back I'm not getting
> anything through the onboard spkr in my K2/100. This is true of
> the spkr in
> the QRP lid as well when swapped out. This happened suddenly
> last evening.
> The internal speaker was working fine, and then I noticed it
> wasn't working
> later in the evening.
>
>
>
> The "ext spkr" is producing no audio now. This is true of the KPA top and
> the QRP top. The lack of audio in the internal speaker and the
> "ext spkr"
> jack in the back are tied together I'm sure. I get a nice
> waterfall in say
> HanScope when the audio is taken from the headphone jack in the
> front of the
> K2/100. If I then switch back to the "ext spkr" in the rear there is no
> sign of audio present in the HamScope waterfall. No audio at the internal
> speaker on the way up to plug into the rear ext spkr jack either.
>
>

--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.441 / Virus Database: 268.17.33/678 - Release Date: 2/9/2007
4:06 PM

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

n8ewy

RE: No output - internal spkr - K2/100

Thanks Don,

I feel a little more comfortable with these concepts each time I have to
work through them. I was pretty certain of the area look over and I knew
(hoping) it was one of those jacks. Going to start digging.

Thanks again to everyone,

Dohn N8EWY

-----Original Message-----
From: Don Wilhelm [mailto:[hidden email]]
Sent: Saturday, February 10, 2007 4:26 PM
To: Dohn; [hidden email]
Subject: RE: [Elecraft] No output - internal spkr - K2/100

Dohn,

With headphones OK, but speaker not working, there are 4 things to check.
First, check to see if you mistakenly plugged the speaker into the P5 header
on the control board - the speaker plugs onto the RF Board.

Second, have the crimp pins in the speaker connector been pushed back into
the housing? The pins must be inserted properly and will lock into place if
done correctly, many builders have trouble with inserting the pins.

Third, is the speaker cable wired backwards? On the QRP top, the copper
wire should connect to pin 1 of RF Board P5 and the non-grounded lug of the
external speaker jack - the KPA100 is opposite in that the tinned wire is
connects to P5 pin 1 and the non-grounded side of the AF path on the KPA100
board.

Forth, check the soldering of the headphone jack, especially the 3 pins
toward the back (these are the switch contacts.

If you think the headphone jack switch may defective, you can check the
resistance from RF Board J8 pin 7 to RF Board P5 pin 1 - this path should
measure close to zero ohms with the headphones removed (if the headphone
jack switch is OK).

Since your speaker 'just quit' after it was working, I would think the first
3 items may be OK,so check the 4th one first - check the soldering first and
then do the continuity check.

73,
Don W3FPR

--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.441 / Virus Database: 268.17.33/678 - Release Date: 2/9/2007
4:06 PM

--
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.1.411 / Virus Database: 268.17.33/678 - Release Date: 2/9/2007

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Geoffrey Mackenzie-Kennedy-2

Re: No output - internal spkr - K2/100

In reply to this post by n8ewy

Dohn,

It does sound as though your problem is caused by a failure of the switch
which is part of the headphone jack. If the switch has failed and stays
'open' you could still get audio out of the headphone jack, but when
removing the headphone plug the audio will not be switched through to the
internal nor external speaker ciurcuits. The switch in both the original and
in a replacement headphone jack in my K2 failed in this manner remaining
'open'.

73,
Geoff
GM4ESD

Dohn N8EWY wrote on Saturday, February 10, 2007 at 8:24 PM

> Howdy .. My real problem is that when there are no headphones plugged into
> the front and nothing hooked to the "ext spkr" in the back I'm not getting
> anything through the onboard spkr in my K2/100. This is true of the spkr
> in
> the QRP lid as well when swapped out. This happened suddenly last
> evening.
> The internal speaker was working fine, and then I noticed it wasn't
> working
> later in the evening.

<snip>

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Brent Sutphin WB4X

Re: No output - internal spkr - K2/100

My K2 has the same problem. I think the phone jack has issues because the
is the second time I have had to replace it in the last 6 months. Just sent
the email for a new one from Elecraft today.

Brent
----- Original Message -----
From: "Geoffrey Mackenzie-Kennedy" <[hidden email]>
To: "Dohn" <[hidden email]>
Cc: "Elecraft Discussion List" <[hidden email]>
Sent: Saturday, February 10, 2007 5:03 PM
Subject: Re: [Elecraft] No output - internal spkr - K2/100

> Dohn,
>
> It does sound as though your problem is caused by a failure of the switch
> which is part of the headphone jack. If the switch has failed and stays
> 'open' you could still get audio out of the headphone jack, but when
> removing the headphone plug the audio will not be switched through to
> the
> internal nor external speaker ciurcuits. The switch in both the original
> and
> in a replacement headphone jack in my K2 failed in this manner remaining
> 'open'.
>
> 73,
> Geoff
> GM4ESD
>
>
> Dohn N8EWY wrote on Saturday, February 10, 2007 at 8:24 PM
>
>
>
>> Howdy .. My real problem is that when there are no headphones plugged
>> into
>> the front and nothing hooked to the "ext spkr" in the back I'm not
>> getting
>> anything through the onboard spkr in my K2/100. This is true of the spkr
>> in
>> the QRP lid as well when swapped out. This happened suddenly last
>> evening.
>> The internal speaker was working fine, and then I noticed it wasn't
>> working
>> later in the evening.
>
> <snip>
>
>
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

Don Wilhelm-3

RE: No output - internal spkr - K2/100

This seems to be a common problem - but I have never experienced it myself.
Unfortunately the form factor for that headphone jack seems to only have one
manufacturer. One can say 'bad design decision' or 'faulty parts' or
anything else, but that does not solve the problem - it would appear to me
that the jack manufacturer has a quality problem, and it won't go away until
that is solved.

There is a work-around that would be 'acceptable' to me, but may not be for
everyone - and that is to short across the contacts of the headphone jack
with a jumper and leave the speaker active all the time - if you want to use
the headphones without the speaker, just stick an empty 3.5 mm plug into the
external speaker jack to silence the internal speaker. I know it is not
nice, but it will work.

73,
Don W3FPR

> -----Original Message-----
>
> My K2 has the same problem. I think the phone jack has issues
> because the
> is the second time I have had to replace it in the last 6 months.
> Just sent
> the email for a new one from Elecraft today.
>
> Brent

> Dohn,

> >
> > It does sound as though your problem is caused by a failure of
> the switch
> > which is part of the headphone jack. If the switch has failed and stays
> > 'open' you could still get audio out of the headphone jack, but when
> > removing the headphone plug the audio will not be switched through to
> > the
> > internal nor external speaker ciurcuits. The switch in both the
> original
> > and
> > in a replacement headphone jack in my K2 failed in this manner remaining
> > 'open'.
> >
> > 73,
> > Geoff
> > GM4ESD
> >

Geoffrey Mackenzie-Kennedy-2

Re: No output - internal spkr - K2/100

In reply to this post by Brent Sutphin WB4X

Brent,

After two headphone jacks failed in my K2, in about the same time span, I
quit and put a better quality jack on the rear panel. In retrospect I think
I should have replaced the external speaker jack by the new headphone jack
and used the existing loudspeaker circuit wiring instead of drilling a hole
and adding wiring.

73,
Geoff
GM4ESD

----- Original Message -----
From: "Brent Sutphin" <[hidden email]>
To: "Geoffrey Mackenzie-Kennedy" <[hidden email]>; "Dohn"
<[hidden email]>
Cc: "Elecraft Discussion List" <[hidden email]>
Sent: Sunday, February 11, 2007 12:18 AM
Subject: Re: [Elecraft] No output - internal spkr - K2/100

> My K2 has the same problem. I think the phone jack has issues because the
> is the second time I have had to replace it in the last 6 months. Just
> sent the email for a new one from Elecraft today.
>
> Brent

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com