Alignment and Test, Part 1 ... K1 2-band

[Eugene Worth]

I’m building a K1 for a fellow ham whose hands won’t allow the fine soldering work that this kit demands. This is the second K1 that I have built.

All of the test points before alignment and test, part 1 have been nominal. I have successfully completed the tests on the LED and LCD/Error Codes without problem.

When I plug in a pair of stereo headphones, the funny business begins … There is no output from the headphones. I rotate the AF GAIN without change. And, the LCD display immediately goes blank when I plug in the headphones.

That said, I can remove the headphones and see the display fine. I can tap the MENU, set and edit the STL and STP without a problem. But, plug in headphones and the K1 goes blank.

I have been reading this list long enough to know that 99% of problems during a build have to do with cold solder joints. I believe I’ve looked at the solder joints. I reflowed the 3 joints at the headphone jack.

Any ideas about how to troubleshoot this problem? I’m missing something in this process. I will go back and make sure that I haven’t left any parts out, but I don’t think this is the case.

Thanks in advance.

gene
WG7GW
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[Eugene Worth]

Yes, you would be correct. The primary problem with most of the errors is an operator problem.

It helps when testing the headphones … to actually plug them into the headphone jack … and not the keyer jack …

Ahem … stand down … this was a case of operator error …

;-/

gene
WG7GW

Back to lurking …


On Jun 23, 2014, at 8:08 PM, Eric Ross <[hidden email]> wrote:

> It sounds like you might have a short that occurs when the headphones are plugged in.  I would check the normally open circuit that goes to the headphones.  My guess is that one side is shorted to ground or another power supply rail.  I have never built a K1, so I am just basing this on standard troubleshooting technique.
>
> Eric
> WB7SDE
>
>
> On Jun 23, 2014, at 19:03 , Eugene Worth <[hidden email]> wrote:
>
> I’m building a K1 for a fellow ham whose hands won’t allow the fine soldering work that this kit demands. This is the second K1 that I have built.
>
> All of the test points before alignment and test, part 1 have been nominal. I have successfully completed the tests on the LED and LCD/Error Codes without problem.
>
> When I plug in a pair of stereo headphones, the funny business begins … There is no output from the headphones. I rotate the AF GAIN without change. And, the LCD display immediately goes blank when I plug in the headphones.
>
> That said, I can remove the headphones and see the display fine. I can tap the MENU, set and edit the STL and STP without a problem. But, plug in headphones and the K1 goes blank.
>
> I have been reading this list long enough to know that 99% of problems during a build have to do with cold solder joints. I believe I’ve looked at the solder joints. I reflowed the 3 joints at the headphone jack.
>
> Any ideas about how to troubleshoot this problem? I’m missing something in this process. I will go back and make sure that I haven’t left any parts out, but I don’t think this is the case.
>
> Thanks in advance.
>
> gene
> WG7GW
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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