sansui au-6900

newf · 23rd May 2010, 11:56 PM

I have a sansui au-6900, when i power it up the light comes on in the front but nothing, no sound or anything. can anyone point me in the right direction?

bob91343 · 24th May 2010, 01:17 AM

It appears that something has failed in the unit and the protection circuitry has prevented that situation from destroying your speakers.

Depending on your bravery and knowledge, you could open it and start measuring things to discover what needs replacing. Otherwise, get someone who knows about such things to help.

sakis · 24th May 2010, 07:31 AM

the particular machine is rather complicated inside ....eventhough the principal of opetration is very simple still inside there is quite of a mess ...

the particular amplifier will need afew to fix but it will take a lot to do to make the amp working properly since everything inside is expected to be aged ...

finally a repair like that will need skills and procedure if you have some ... you will get some help here in the forum but at least you need to know the basics

regards sakis

newf · 24th May 2010, 07:27 PM

I know a little, the problem is the age of this amp, no one around where i live wants to take it on, i love this amp so would like to hang on to it. if anyone has any service manuals for it that would even be a great help.

bob91343 · 24th May 2010, 09:08 PM

RapidShare: 1-CLICK Web hosting - Easy Filehosting

I just downloaded a service manual here. Where do you live?

newf · 24th May 2010, 09:26 PM

i live in newfoundland

newf · 24th May 2010, 10:25 PM

I did find what appears to be a relay, which if i follow the wires back from the power switch, seems to be directly after the power switch. If I "tap" on this relay, which is clear, i can see a small arc and a noise from the speaker. Is it possible this relay is me issue?

bob91343 · 24th May 2010, 11:31 PM

No the problem isn't the relay itself. That is protecting your speakers. Better disconnect them and troubleshoot the amplifier before you cause more damage.

davada · 25th May 2010, 01:08 AM

Quote:

Originally Posted by newf

I have a sansui au-6900, when i power it up the light comes on in the front but nothing, no sound or anything. can anyone point me in the right direction?

I have a AU6900. I have a schematic for it but not the service manual.
I don't have a scanner so I would have to photo copy it and send it to you.

The 6900 has a relay protection circuit and if either channel has a dc offset then the relay won't activate connecting the speakers.

I have repaired mine a couple of times. Most of the parts are no longer available but I have had success in substituting output transistors into it.

David.

23rd May 2010, 11:56 PM	#1
newf diyAudio Member Join Date: May 2010	sansui au-6900 I have a sansui au-6900, when i power it up the light comes on in the front but nothing, no sound or anything. can anyone point me in the right direction?

24th May 2010, 07:31 AM	#3
sakis diyAudio Member Join Date: Jan 2006 Location: nea makri athens greece	the particular machine is rather complicated inside ....eventhough the principal of opetration is very simple still inside there is quite of a mess ... the particular amplifier will need afew to fix but it will take a lot to do to make the amp working properly since everything inside is expected to be aged ... finally a repair like that will need skills and procedure if you have some ... you will get some help here in the forum but at least you need to know the basics regards sakis __________________ SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr

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24th May 2010, 01:17 AM	#2
bob91343 diyAudio Member Join Date: Mar 2010	It appears that something has failed in the unit and the protection circuitry has prevented that situation from destroying your speakers. Depending on your bravery and knowledge, you could open it and start measuring things to discover what needs replacing. Otherwise, get someone who knows about such things to help.

24th May 2010, 07:27 PM	#4
newf diyAudio Member Join Date: May 2010	I know a little, the problem is the age of this amp, no one around where i live wants to take it on, i love this amp so would like to hang on to it. if anyone has any service manuals for it that would even be a great help.

24th May 2010, 09:08 PM	#5
bob91343 diyAudio Member Join Date: Mar 2010	RapidShare: 1-CLICK Web hosting - Easy Filehosting I just downloaded a service manual here. Where do you live?

24th May 2010, 09:26 PM	#6
newf diyAudio Member Join Date: May 2010	i live in newfoundland

24th May 2010, 10:25 PM	#7
newf diyAudio Member Join Date: May 2010	I did find what appears to be a relay, which if i follow the wires back from the power switch, seems to be directly after the power switch. If I "tap" on this relay, which is clear, i can see a small arc and a noise from the speaker. Is it possible this relay is me issue?

24th May 2010, 11:31 PM	#8
bob91343 diyAudio Member Join Date: Mar 2010	No the problem isn't the relay itself. That is protecting your speakers. Better disconnect them and troubleshoot the amplifier before you cause more damage.