[sdiy] PAIA Tubehead not functioning

[Jim Panci]

Hi Robert,

If you're not getting power to the LED it's likely that the problem is
in the power supply. I'm not particularly familiar with this project
but this is a good opportunity to hone your diagnosis skills. Use a
voltmeter to check for correct voltages at the LED and trace back to
the secondary of the transformer. Be careful and use the correct
settings AC vs DC and the correct voltage range of the meter. Be extra
careful testing on the primary side of the transformer. This type of
diagnosis is common when things don't work the first time. The voltage
stops somewhere and it's probably before the LED.

I'll let others with  more specific knowledge chime in with more details.


On 2/25/08, Robert Krueger <robert.krueger at gmail.com> wrote:
> Well, my first PAIA kit, Tubehead is now complete. But it's not
>  working :).  One good thing is that when I plug it in, there's no
>  smoking, burning, or ozone smell, that's good. I've triple checked the
>  Diodes, Capacitors, IC polarities and they are fine. I don't see any
>  shorts in the traces on the board. I'm a bit at a loss as to why this
>  isn't working. I'm not getting the power LED lit or anything. I've
>  rechecked the wire from the power switch to the board, there is
>  continuity, so the board should be getting juice.  I'm at a loss here.
>
>  Anyone familiar with this project and can take a few minutes to guide
>  me through how to track the problem down. I have a multimeter, etc.
>
>  Thanks
>
>  -Robert
>
>  sorry for the cross post to those on mult lists.
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