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Sony receiver STR-DE545, transformer voltages    
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DarioE



Joined: 25 Jan 2015
Posts: 3

PostPosted: Sun Jan 25, 2015 8:53 am    Post subject: Sony receiver STR-DE545, transformer voltages Reply with quote

Does anyone know what are the output AC voltages of the main power transformer 1-405-309-11?

I have the service manual but it only states the desired DC voltages.
The problem is that all the currency regulators are overheating and in 2 minutes PROTECT stars flashing

Thanks !
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JTS1957



Joined: 21 Jan 2009
Posts: 2340
Location: Far, Far Away

PostPosted: Sun Jan 25, 2015 10:14 am    Post subject: Reply with quote

I'm pretty sure Sony had that transformer designed and constructed to meet the DC voltage & current needs of the supplies involved for a (correctly) operational receiver.

I have no idea what financial regulatory arguments or stars twinkling have to do with an amplifier problem or power supply circuit problem.
DarioE



Joined: 25 Jan 2015
Posts: 3

PostPosted: Sun Jan 25, 2015 11:20 am    Post subject: Reply with quote

Ha ha
Funny
But you don't know the voltages, right?
Btw, I am also sure they designed it corretly
JTS1957



Joined: 21 Jan 2009
Posts: 2340
Location: Far, Far Away

PostPosted: Sun Jan 25, 2015 12:01 pm    Post subject: Reply with quote

1) Unit purchased and worked fine out of the box.
2) Unit develops "The problem is that all the currency regulators are overheating and in 2 minutes PROTECT stars flashing" and fails to work correctly.
3) Part(s) that are causing #2 are diagnosed defective, ordered and replaced.
4) Unit works correctly and is returned to service.

You know the DC voltages involved (and have a means to measure them?).
You have access to the Internet and the Service Manual.
The service manual gives parts identity ... the Internet allows datasheets with parts specifications to be pulled up ... where's the problem?

My point being is that to troubleshoot this unit, you don't need to know the power transformers AC voltages (presuming the AC Input IS 120VAC).

Which 'currency regulators' are overheating?
JTS1957



Joined: 21 Jan 2009
Posts: 2340
Location: Far, Far Away

PostPosted: Mon Jan 26, 2015 6:05 pm    Post subject: Reply with quote

Assuming that the unit works normally for the 2 minutes before it goes into 'protect,' make sure there are no bad solder joints on the power supply regulators and audio output driver ICs and that all ground screws are tight, even on the rear panel.
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DarioE



Joined: 25 Jan 2015
Posts: 3

PostPosted: Tue Jan 27, 2015 2:36 am    Post subject: Reply with quote

Solved
kuhurdler



Joined: 28 Dec 2006
Posts: 2862
Location: Overland Park, KS

PostPosted: Tue Jan 27, 2015 10:53 am    Post subject: Reply with quote

care to tell us how?
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