hifi engine

Pioneer SX 950 Need service manual

My friend has acquired a very good looking Pioneer SX-950. It lights up but no sound. The secondary Relay never clicks in. I have checked caps in power supply, regulator and small bias? board. Does any one have a service manual? All output transistors check good with no leakage. Just need a little help to zero in on this one. Thanks Overloaded in KS. Email tvdocfixx@yahoo.com