Electronics > Repair
BERNINA power supply board (Switch Mode) issue diagnosis and beyond (fixed)
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max.wwwang:

--- Quote from: inse on December 20, 2024, 09:24:41 am ---Nicely drawn schematic, though boring.
Btw, R52 is 160Ohms and R53 150Ohms.
The circuit around the TL431 is providing the feedback for the voltage regulation of the 5V rail.
The other voltages are determined by the turns ratio.

--- End quote ---
Thanks. Corrected version.
max.wwwang:
More boring the other half, without the daughter board.
max.wwwang:
Is someone able to figure out the topology of the bigger transformer?
inse:
It looks like a flyback converter, or what do you mean by topology?
max.wwwang:

--- Quote from: inse on December 20, 2024, 09:10:12 pm ---It looks like a flyback converter, or what do you mean by topology?

--- End quote ---
I mean the internal wiring and polarity of the windings of the transformer U146.

Obviously the schematic is a result of pcb tracing and reverse engineering (at the early stage). That means its layout probably obscures its logic and working, which I will revise as my understanding of the circuit evolves.

As always, I tend to like to spend time to learn from a repair project, beyond just getting it back working (which is of course also keenly sought).
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