Use a dim-bulb tester (a 60W incandescent bulb in series with AC line) for first power-up. Measure no-load voltage – it should be within ±2% of rating.
Working with switch-mode power supplies involves lethal voltages (up to 400V DC on the primary side). Capacitors can retain charge for days. Always discharge bulk capacitors through a 10kΩ/5W resistor before probing. wannien 101v0 power supply schematic repack
The schematics in a repack are for educational and repair purposes. Modifying the Wannien 101V0 may void its safety certifications (UL, CE). Do not use repaired units in medical or life-support equipment. Use a dim-bulb tester (a 60W incandescent bulb
Even if they look fine, cap aging is the #1 failure. Replace with Panasonic FC or Nichicon PW series. Do not use no-name capacitors. Even if they look fine, cap aging is the #1 failure
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