Sony TA-F55

[MassiAudio]

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]

Look for a broken 120k resistor in the PSU.

/Hugo

 

[MassiAudio]

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]

That's what my repair database said.

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

/Hugo

 

[MassiAudio]

Ok, thank you, I'll continue the search .

 

[Bigred]

http://www.user-manuals.com/advanced_search_result.php?keywords=sony ta-f55&sort=2a&page=1188

$15 well spent

 

[m2003br]

MassiAudio,

email sent to you.

Marcos

 

[MassiAudio]

Thank you very much to everybody for your help .

Massi