problems with behringer ddx3216

[ryo]

hi guys,
it's ryo writing from italy.

i've been using a behringer ddx3216 digital mixer with a 2xADAT expansion
with my DAW since about 3 years.

now i have a problem: even with no attached cables, every some tens of
seconds any analog inputs "receive" a (short) signal at about -20db.
the strange is that not only i can see the fader leds on for a while, but
even the "signal" leds on the input pane go on. just like if something were
attached in the inputs and generating a signal.

do you know if there's something i can do before carrying it to the
assistance?

thanks in advance

--
ryo

[Mike Rivers]

ryo wrote:

> now i have a problem: even with no attached cables, every some tens of
> seconds any analog inputs "receive" a (short) signal at about -20db.
> the strange is that not only i can see the fader leds on for a while, but
> even the "signal" leds on the input pane go on. just like if something were
> attached in the inputs and generating a signal.
>
> do you know if there's something i can do before carrying it to the
> assistance?

These things are generally not user-servicable at all. If it was, and
you were qualified to service it, you'd be into it already and coming
in with more detailed questions.

Have you relocated? Or has something that creates EMI (radio
interference) moved in next door? Industrial machinery? Medical
facility?

[Don Pearce]

On Thu, 25 Jan 2007 14:05:50 +0100, "ryo" > wrote:

>hi guys,
>it's ryo writing from italy.
>
>i've been using a behringer ddx3216 digital mixer with a 2xADAT expansion
>with my DAW since about 3 years.
>
>now i have a problem: even with no attached cables, every some tens of
>seconds any analog inputs "receive" a (short) signal at about -20db.
>the strange is that not only i can see the fader leds on for a while, but
>even the "signal" leds on the input pane go on. just like if something were
>attached in the inputs and generating a signal.
>
>do you know if there's something i can do before carrying it to the
>assistance?
>
>thanks in advance

Can you record and post a chunk of it? What it looks and sounds like
is the number 1 diagnostic.

d

--
Pearce Consulting
http://www.pearce.uk.com

[Abemeister]

Grounding problems? Check your studio power?

On Jan 25, 8:05 am, "ryo" > wrote:
> hi guys,
> it's ryo writing from italy.
>
> i've been using a behringer ddx3216 digital mixer with a 2xADAT expansion
> with my DAW since about 3 years.
>
> now i have a problem: even with no attached cables, every some tens of
> seconds any analog inputs "receive" a (short) signal at about -20db.
> the strange is that not only i can see the fader leds on for a while, but
> even the "signal" leds on the input pane go on. just like if something were
> attached in the inputs and generating a signal.
>
> do you know if there's something i can do before carrying it to the
> assistance?
>
> thanks in advance
>
> --
> ryo

[Gareth Magennis]

"ryo" > wrote in message
...
> hi guys,
> it's ryo writing from italy.
>
> i've been using a behringer ddx3216 digital mixer with a 2xADAT expansion
> with my DAW since about 3 years.
>
> now i have a problem: even with no attached cables, every some tens of
> seconds any analog inputs "receive" a (short) signal at about -20db.
> the strange is that not only i can see the fader leds on for a while, but
> even the "signal" leds on the input pane go on. just like if something
> were attached in the inputs and generating a signal.
>
> do you know if there's something i can do before carrying it to the
> assistance?
>
> thanks in advance
>
> --
> ryo
>
>

My guess would be the internal power supply to the analogue circuits. Could
be something as simple as a dirty connector inside the desk. Sudden drops
of voltage to the IC's will produce audio spikes. Try banging the desk with
your hand - do the lights flicker with mechanical shocks?



Gareth.

[ryo]

"Gareth Magennis" > ha scritto nel messaggio
...

> My guess would be the internal power supply to the analogue circuits.
> Could be something as simple as a dirty connector inside the desk. Sudden
> drops of voltage to the IC's will produce audio spikes. Try banging the
> desk with your hand - do the lights flicker with mechanical shocks?

thanks to all of you, guys.
sorry for being late, i was out for work.

i think gareth is right. i'll check it togheter with my favourite electronic
engineer :)
anyway banging the desk produces no results.

i'll keep you informed :)

--
ryo