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From: Brasto on 9 May 2010 09:57
I have a Sansui AU-D55X amplifier which when pressing POWER-ON shows a
RED Flashing light labelled Protection.
The light will flash aprox 10 times in 5 seconds before the speakers
are switched on and sound is heard.
The Amplifier performs flawlessly in all functions and outputs
selected.
I just donot know whether such a delayed start is normal or not, more
over as the original owner stated that it behaved that way since day
one....

I like the idea of ...If it ain't broken, do not fix it, I have no
Operating Instructions so I am not sure.....it could be a self test?
From: William Sommerwerck on 9 May 2010 10:14
It's almost certainly normal for this amplifier. I own Lux and Parasound
amplifiers that behave the same way.

It takes several seconds for the amplifier's voltages to stabilize at
turn-on. The protection circuit leaves the speakers disconnected during this
period. It then checks to see whether there's a DC offset at the output (and
possibly at other points). If there is not, the speakers are connected.

Be grateful that the amp and the protection circuit are working correctly.


From: Jamie on 9 May 2010 10:34
Brasto wrote:
> I have a Sansui AU-D55X amplifier which when pressing POWER-ON shows a
> RED Flashing light labelled Protection.
> The light will flash aprox 10 times in 5 seconds before the speakers
> are switched on and sound is heard.
> The Amplifier performs flawlessly in all functions and outputs
> selected.
> I just donot know whether such a delayed start is normal or not, more
> over as the original owner stated that it behaved that way since day
> one....
>
> I like the idea of ...If it ain't broken, do not fix it, I have no
> Operating Instructions so I am not sure.....it could be a self test?
Bad caps in the supply..
The protection circuit is most likely detecting excessive ripple..

Also the I've found bad caps in the protection circuit itself..

A warm up tends to make some caps perform better. At some point, it'll
get worse.
Also, you may want to check for bad joints.

From: William Sommerwerck on 9 May 2010 11:24
> Bad caps in the supply..
> The protection circuit is most likely detecting excessive ripple..
> Also the I've found bad caps in the protection circuit itself..
> A warm up tends to make some caps perform better. At some
> point, it'll get worse.
> Also, you may want to check for bad joints.

Though it's possible there /is/ something wrong with the protection circuit,
five seconds is not an unreasonable delay. If the amp sounds okay, and works
correctly... why go poking around?


From: lsmartino on 9 May 2010 13:42
On 9 mayo, 09:57, Brasto <bram.st...(a)gmail.com> wrote:
> I have a Sansui AU-D55X amplifier which when pressing POWER-ON shows a
> RED Flashing light labelled Protection.
> The light will flash aprox 10 times in 5 seconds before the speakers
> are switched on and sound is heard.
> The Amplifier performs flawlessly in all functions and outputs
> selected.
> I just donot know whether such a delayed start is normal or not, more
> over as the original owner stated that it behaved that way since day
> one....
>
> I like the idea of ...If it ain't broken, do not fix it, I have no
> Operating Instructions so I am not sure.....it could be a self test?

I remember owning an Sansui amplifier that did the same thing. At
power on the protection light turned on for 5 - 6 seconds, then it
turned off and the amplifier started to operate. It did that since
new, so that´s the way the protection ciruit was designed to operate.
I think the user manual said the same.
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