hifi engine

Sony TA H4700

Hi everybody!

I have a Sony TA H4700 Amplifier for the MHC-4700 system.
Now, when I plug in the power cord, the display stay dark.
Only on the left side of the display you can see it a little bit shining.
I think there is a poblem with the power supply.

I am searching a lot of time for the service manual, but have no one found.
Can somebode help me?
Your help is greatly appreciated.

Thanks in advance!

Sony TA H4700

You might check C923 (220uF / 50V) and R917 (1k) near the volume potmeter.