K2 DSP Problem

[Julius Fazekas n2wn]

Hello Folks,

Finally had a chance to work on some of my kits.
I had completed the DSP kit and just now am installing
it.

No smoke, but the red LED remains on.

I've checked all the soldering, reseated U1, checked
D3 (for type and function), re installed the boards.
Firmware is 204p in #3311. Still no go...

Any suggestions?

Thanks!
Julius
n2wn
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[KK7P]

 > Finally had a chance to work on some of my kits.
> I had completed the DSP kit and just now am installing
> it.
>
> No smoke

That's good!

> but the red LED remains on.

That's not so good.

 >...
 > Any suggestions?

The LED comes on when the DSPx resets, and goes off when it handshakes
with U1 on the KDSP2 board.

Do you have any audio?  If so, this indicates the DSPx is initializing
and the problem might be associated with the LED circuity or U1.

Can you get a display by pressing AFIL?  SF2 or CF2 depending in mode,
for example. If so, this indicates that U1 is probably working and there
may be a PCB problem or a DSPx problem.  If not, U1 may be the culprit.

If you can safely probe J1 20 (on the DSPx while plugged into the K2 and
switched on) you should see that pin 20 (DSPx reset) is pulsed to ground
at turn-on, then rises to something over 3V.  If it stays low, the DSPx
is always being held in reset. If it never goes low, the DSPx is not
getting reset.


73,

Lyle KK7P

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[Julius Fazekas n2wn]

Thanks for the suggestion Lyle. I'll check that out. I
didn't have a speaker or headphones connected. From
the SEC menu, I was not able to turn the DSP on.
73,
Julius
n2wn


--- Lyle Johnson <[hidden email]> wrote:

>  > Finally had a chance to work on some of my kits.
> > I had completed the DSP kit and just now am
> installing
> > it.
> >
> > No smoke
>
> That's good!
>
> > but the red LED remains on.
>
> That's not so good.
>
>  >...
>  > Any suggestions?
>
> The LED comes on when the DSPx resets, and goes off
> when it handshakes
> with U1 on the KDSP2 board.
>
> Do you have any audio?  If so, this indicates the
> DSPx is initializing
> and the problem might be associated with the LED
> circuity or U1.
>
> Can you get a display by pressing AFIL?  SF2 or CF2
> depending in mode,
> for example. If so, this indicates that U1 is
> probably working and there
> may be a PCB problem or a DSPx problem.  If not, U1
> may be the culprit.
>
> If you can safely probe J1 20 (on the DSPx while
> plugged into the K2 and
> switched on) you should see that pin 20 (DSPx reset)
> is pulsed to ground
> at turn-on, then rises to something over 3V.  If it
> stays low, the DSPx
> is always being held in reset. If it never goes low,
> the DSPx is not
> getting reset.
>
>
> 73,
>
> Lyle KK7P
>
>

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