Old power supply computer by TL494

An elder brother of me works about repair a computer. Once meet a problem power supply Switching , of a computer s lose. It is old circuit. I then help to seek give. Get this circuit think may disagree. But enough use can replace. if friends meet same this problem try out please. It can give voltage output 5V , +12V,-12V. Use the integrated circuit TL494 be pillar equipment seek good easy.
By apply to voltage 110V and 220V choose done to a turn SW1. The detail is other a friend sees in the circuit be lucky sir.

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