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Designed for demanding applications requiring steady high-current output.
The original TL431-based feedback circuit had a gain margin issue at light loads. The patched version modifies resistors R34 and C21 on the daughterboard. Specifically, a is added in parallel with the optocoupler’s phototransistor side. This damps the loop response. hys3c210cs power supply patched
If you are looking to "patch" (repair or modify) this power supply, here is the standard technical approach used for these types of units: Common "Patch" Scenarios Capacitor Replacement Specifically, a is added in parallel with the
After patching, load test the unit with a 12V 50W halogen bulb or a resistive load. Monitor ripple with an oscilloscope. You should see the whine disappear and ripple drop below 50mV. Monitor ripple with an oscilloscope
: If the unit has a short circuit, it is often due to a blown MOSFET on the 12-volt rail. Replacing the faulty transistor is a common hardware-level fix. Basic Troubleshooting Steps
Remove the degraded electrolytic capacitors across the auxiliary and main output banks.
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