The unit is mostly SMD. Some connections are only available from the
bottom. The unit takes so little power that nothing heats up. I tried
letting it sit until the problem appears, than tapping many points, with no
change. I tried tracing, but since the element location needs to be
deduced, and there are many components, a few hr work lead nowhere.
Ignacy, NO9E
On Sat, Nov 7, 2015 at 8:05 PM, shawn via TenTec <tentec@contesting.com>
wrote:
> Can you use it with the cover off? If so, I would run it until the problem
> occurs, then feel and see if anything is hot. Do some voltage checks, see
> more f any do not check against the manual.
>
> If you leave the unit on, but not in TX mode, will it do this? As in,
> power on for say an hour, then check on tx--is it dead? Am not familiar
> with unit, but I am wondering if it would isolate anything.
>
> Odds are good for a bad solder joint--I would check and reflow. I would
> not think bad components but blindly replacing in the signal path may find
> it.
>
> shawn kb1ckt
>
> Sent from my iPad
>
> > On Nov 6, 2015, at 2:43 PM, Ignacy Misztal <no9e@arrl.net> wrote:
> >
> > I bought TT715 used from W8EK last year. TT715 does wonders with Elecraft
> > KX3 (reports 2 S better) but has one problem. After about 10-20 minutes,
> > the lights are still on but there is not output. W8EK claims it was good
> > when he emailed to me. TT715 looks new.
> >
> > I called TT service a year ago, and they claimed it may take a few hrs
> > -perhaps more than TT715 is worth. I tried to look for weak points,
> > tapping, checking with oscilloscope, and after a few hrs I could not find
> > what is wrong. While a schematic is available,there is no component
> > placement. Diagnostics is not easy since I have to wait until the
> condition
> > occurs.
> >
> > Did anyone have a similar problem? Any idea how to fix without taking
> days?
> >
> >
> > Ignacy, NO9E
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