24V Switching Power Supply Diagnosis – Step by Step

Описание: In this episode on ElectroMaster, we troubleshoot and repair a faulty 24V switching power supply from a professional Bizerba industrial machine. Initially misdiagnosed as defective, the unit was actually functional — with the real issue being a missing control voltage to the PWM controller.

💡 What you'll learn in this video:

✔️ How to perform a visual inspection for hardware damage
✔️ Testing the fuse, varistor, MOSFETs, and rectifier diodes
✔️ Identifying the SG2525A PWM IC and checking its supply pins
✔️ Injecting an external 12V to activate the controller
✔️ Using the oscilloscope to verify gate drive signals
✔️ Understanding the ON/OFF control transistor and logic activation
✔️ Final output verification – 24V DC successfully restored!

This video is a great example of how logical analysis and step-by-step testing can solve problems that others may overlook. No unnecessary part replacements — just smart diagnostics.

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