pioneer hi-fi problem, please help!

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Folks, I have just repaired such a unit. The problem was found to be a 4,700 microfarad power supply capacitor that goes leaky under voltage which blows fuse #404. I noticed it was slightly bulging at the top compared to the other capacitors.
I couldn't get a circuit but also traced the circuitry around the relay that connects the mains to the main transformer and found a problematic 7550-1 I.C. which I replaced with a 78L05. The circuitry associated with this regulator gets controlled from elsewhere and disconnects the mains if something is detected as wrong.
Hope this helps someone.

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