I've got an industrial SMPS for a laboratory optical microscope that failed. When probing to measure for voltages I accidentally destroyed some components.
In the attached image I hand traced the circuit to help me understand the operation to better narrow down the fail point.
One of the components that was destroyed by my stupidity was the Zener diode in the gate driver circuit. Since the diodes were MELF package type I don't know the exact part number. Would it be safe to replace with a 10V zener or should it be higher like 15V?
Also destroyed were the PNP BJTs (BC32725.) The gate driver circuits are isolated through a small 1:1:1 transformer which is driven by the PWM circuit.
Gate driver circuit:
PWM,PFC and DC regulation: