Sony 7800sd issues

[Sglaw461]

Hi all, I have a rare STR-7800SD in great shape that I'm repairing. I need a photograph of the connections of the power amp board underneath The board has no English on it, only Japanese and it has been disconnected on one side by a previous guy who did some shoddy work on it. There is no service manual of any use for this model as it had a limited production run. Thanks for any assistance.

 

[Binkman]

Gday;
only thing I can offer is perhaps a comparison to the str-6800sd
http://www.thevintageknob.org/sony-STR-7800SD.html

serv. man. note sony's potential inaccuracy for error..
https://www.hifiengine.com/manual_library/sony/str-6800sd.shtml

 

[cademan]

 

[bobdod]

I did a restoration of a 7800 and have a thread with pictures. Might help you.

 

[Sglaw461]

Great, thanks. Do you notice crosstalk between inputs when you switch to FM but leave an Aux input with audio still running? I have serviced 2 and they both did it. I believe its the pure signal path they used in this design.