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Please check Q1003 and Q1008, both are NPN switching transistors, also check R1011 1r3 1W that should be accurate. There is opto coupler IC1001 that drives by Q1004 on secondary side, a zener diode D1019 6.8V should be checked.
Do you have schematics of this power supply? If not, please reply back to provide you a copy.
Sorry to hear that, let me recheck the schematics and get back to you in few minutes.
I apologize on delayed reply, have you checked R1011 1r3 1W resistor taking it out of circuit?
This resistor is critical and its value should be exact.
Please click following link to download service manual copy that will help you..