Prev: Sony SDM-HS74P 17" TFT 'two seconds to black'
Next: Denon DP-1200 Direct Drive Record Player - Turntable
From: BodgeIt on 9 May 2010 15:16

I had a Sansui amplifier years back with the same protection circuit
and it did the same thing, it looks for a short across the speaker
terminals after you switch on, if all ok the light goes off.



On Sun, 9 May 2010 06:57:21 -0700 (PDT), Brasto <bram.stolk(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?
From: Brasto on 11 May 2010 04:04
On 10 mei, 18:16, Meat Plow <mhyw...(a)yahoo.com> wrote:
> On Sun, 09 May 2010 06:57:21 -0700, 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?
>
> Most protection circuits wait a few seconds for voltages to equalize and
> then allow the speakers to be connected to the amplifier. I would say the
> 5 second delay is perfectly normal.

OK, friends most of your advices and comments reinforce my idea that
there is really nothing wrong with my amplifier.
In the meantime I checked as a precaution the DC-offset at the speaker
terminals and the Bias setting driving the Main.
All measurements indicated no anomalies, so I guess it is safe to
state that a blinking PROTECTION light at start-up of my Sansui AU-
D55X is a NORMAL indication provided the speaker relay is activated in
~~5 seconds...

So..If it ain't broken, I cannot fix it....

TY
Brasto
From: Meat Plow on 11 May 2010 12:35
On Tue, 11 May 2010 01:04:54 -0700, Brasto wrote:

> On 10 mei, 18:16, Meat Plow <mhyw...(a)yahoo.com> wrote:
>> On Sun, 09 May 2010 06:57:21 -0700, 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?
>>
>> Most protection circuits wait a few seconds for voltages to equalize
>> and then allow the speakers to be connected to the amplifier. I would
>> say the 5 second delay is perfectly normal.
>
> OK, friends most of your advices and comments reinforce my idea that
> there is really nothing wrong with my amplifier. In the meantime I
> checked as a precaution the DC-offset at the speaker terminals and the
> Bias setting driving the Main. All measurements indicated no anomalies,
> so I guess it is safe to state that a blinking PROTECTION light at
> start-up of my Sansui AU- D55X is a NORMAL indication provided the
> speaker relay is activated in ~~5 seconds...
>
> So..If it ain't broken, I cannot fix it....
>
> TY
> Brasto

I used to do Sansui warranty and found their equipment very sensitive
regarding self testing designs. Meaning that the slightest little problem
kept any protection circuit active. I was always given the tough-dog
Sansui units since nobody else had the patience, dedication and
experience to repair them.

First  |  Prev  | 
Pages: 1 2
Prev: Sony SDM-HS74P 17" TFT 'two seconds to black'
Next: Denon DP-1200 Direct Drive Record Player - Turntable