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Old 21st May 2005, 09:24 PM   #1
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Default Pioneer SX-780

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
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Old 22nd May 2005, 12:49 AM   #2
djk is offline djk
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You don't need a schematic.

99% chance it is the solder joints on the 15V regulator transistor.
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Old 22nd May 2005, 09:17 PM   #3
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Default 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
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Old 23rd May 2005, 05:06 AM   #4
Leolabs is offline Leolabs  Malaysia
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I know there is a website known as "schematic for free",but just cant remember the actual website address
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Old 23rd May 2005, 05:09 AM   #5
Leolabs is offline Leolabs  Malaysia
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I know there is a website known as "schematic for free",but just cant remember the correct address.
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Old 23rd May 2005, 05:17 AM   #6
kinser is offline kinser  Israel
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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!
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Old 23rd May 2005, 06:26 AM   #7
dce is offline dce  United States
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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.
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Old 25th May 2005, 04:43 AM   #8
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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
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Old 25th May 2005, 06:24 AM   #9
dce is offline dce  United States
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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
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