Sony TA-F55

MassiAudio · 17th January 2008, 10:34 AM

Hi everyone, I have a problem with switching power supply of a Sony TA-F55.

I have changed the electrolytic capacitors, but I don't have output voltage.

300 volt input is ok.

I also try without load, but I don't have output voltage again.

Transistors are ok, and also diodes.

I searched for the service manual or electric diagram and also in the forum without success.

Anyone can help me, please?

Thanks in advance.

Bye
Massi

Netlist · 17th January 2008, 10:41 AM

Look for a broken 120k resistor in the PSU.

/Hugo

MassiAudio · 17th January 2008, 12:25 PM

Thanks for answer

.

There is not a 120k resistor.
The high value one is 200k (yes, just 200k and not 220k) and it's ok.

I forgot to say that I checked all resistors and are ok...

Also, I found a BC640 instead of 2SA1026, but I think it's ok anyway.

Netlist · 17th January 2008, 12:36 PM

That's what my repair database said.

You'll need the schematic, I'm afraid.

/Hugo

MassiAudio · 17th January 2008, 12:52 PM

Ok, thank you, I'll continue the search

.

Bigred · 18th January 2008, 03:56 AM

http://www.user-manuals.com/advanced...t=2a&page=1188

$15 well spent

m2003br · 18th January 2008, 11:40 AM

MassiAudio,

email sent to you.

Marcos

MassiAudio · 18th January 2008, 12:46 PM

Thank you very much to everybody for your help

.

Massi

17th January 2008, 10:34 AM	#1
MassiAudio diyAudio Member Join Date: Jan 2007 Location: Vicenza	Sony TA-F55 Hi everyone, I have a problem with switching power supply of a Sony TA-F55. I have changed the electrolytic capacitors, but I don't have output voltage. 300 volt input is ok. I also try without load, but I don't have output voltage again. Transistors are ok, and also diodes. I searched for the service manual or electric diagram and also in the forum without success. Anyone can help me, please? Thanks in advance. Bye Massi

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17th January 2008, 10:41 AM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	Look for a broken 120k resistor in the PSU. /Hugo

17th January 2008, 12:25 PM	#3
MassiAudio diyAudio Member Join Date: Jan 2007 Location: Vicenza	Thanks for answer . There is not a 120k resistor. The high value one is 200k (yes, just 200k and not 220k) and it's ok. I forgot to say that I checked all resistors and are ok... Also, I found a BC640 instead of 2SA1026, but I think it's ok anyway.

17th January 2008, 12:36 PM	#4
Netlist diyAudio Moderator Join Date: Jan 2003	That's what my repair database said. You'll need the schematic, I'm afraid. /Hugo

17th January 2008, 12:52 PM	#5
MassiAudio diyAudio Member Join Date: Jan 2007 Location: Vicenza	Ok, thank you, I'll continue the search .

18th January 2008, 03:56 AM	#6
Bigred diyAudio Member Join Date: Jul 2007	http://www.user-manuals.com/advanced...t=2a&page=1188 $15 well spent

18th January 2008, 11:40 AM	#7
m2003br diyAudio Member Join Date: Dec 2004 Location: Sao Paulo	MassiAudio, email sent to you. Marcos

18th January 2008, 12:46 PM	#8
MassiAudio diyAudio Member Join Date: Jan 2007 Location: Vicenza	Thank you very much to everybody for your help . Massi

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