Amplifier problems Sony str-de-425

[Eleco wizz]

Hi There
Is anyone familiar with the sony Str-de-425 as mine goes into protect mode all the time.
I would like to get a wiring diagram if possible
Thanking you
Pete :cry:

 

[Nigel Goodwin]

Hi There
Is anyone familiar with the sony Str-de-425 as mine goes into protect mode all the time.
I would like to get a wiring diagram if possible
Thanking you
Pete :cry:

There are five amplifiers in the STR-DE425, three have discrete output stages with IC drivers, the other two are single IC's. You need to test the outputs from them to see if one has a DC standing voltage on it, all five connect into the same protection circuit. Probably one of the easiest places to measure is on the speaker switching relays!.

A common cause is often dry (cold soldered) joints on output IC's.

I've got a manual on Sony Assist, but they are password protected PDF files - and the password is provided by the Assist program.