Pioneer SX-780

[aaronlubelski]

Does anybody have the schematics of the PIONEER receiver SX-780?
After a long night of operation the relay is not engaged and of course no audio.

regards, Aaron

 

[djk]

You don't need a schematic.

99% chance it is the solder joints on the 15V regulator transistor.

 

[aaronlubelski]

Very close

Thanks for the tip, it help me to probably pinpoint the problem

It was very close, actually one of the power regulator transistors failed, the DT12 type. I have to get a replacement and then will see. Anyway a schematics would help.

many thanks, Aaron

 

[Leolabs]

I know there is a website known as "schematic for free",but just cant remember the actual website address

 

[Leolabs]

I know there is a website known as "schematic for free",but just cant remember the correct address.

 

[kinser]

aaronlubelski, Leolabs,

I know 2 web sites.
1. http://www.eserviceinfo.com/ - they have lots of service manuals and so on....
2. http://www.schematicsforfree.mattsoft.net/ - they have some service manulas too.. and also more circuits!

Hope i helped!
Kinser

BTW
Aaron were are u from in Israel? im from R'aanana!

 

[dce]

I will try to find my service manual for that model.
But I cannot make any promises if I still have it.ok.
just give me some time to look for it.

 

[aaronlubelski]

Thanks to all for the help, I am making progress.

I do have fixed the 13 v regulator and then the SX-780 started working.

There are additional 2 regulators giving +/- 50 volt, I guess this is wrong and they are failing.

Does any of you know what should be their voltage?

Still looking for schematics/manual. That would help. I could not find them in the sites offered.

Thanks a lot anyway.

Aaron

 

[dce]

Aaron,

Hello! I can't remeber the voltages there.
Its really been a while since the last time I work on that
model. I am still looking for the service manual of that
model. I know I have that but I can't remember where did
I put it.
I will ask my technicians maybe its on my old filing cabinet.

Danny