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If you’ve landed on this page, you are likely holding a broken bench power supply and staring at a specific model number: .
Four discrete diodes or a single integrated bridge rectifier package that converts AC voltage to pulsating DC.
The supply outputs ~40V DC and ignoring the control knobs. wannien 101v0 power supply schematic free
Sites like Badcaps.net or Diyaudio often have users who have already traced these boards. Searching for "Wan Nien 101V0 repair" can yield user-posted schematics.
[AC Input] ──> [Fuse] ──> [EMI Filter] ──> [Bridge Rectifier] ──> [Bulk Cap (400V)] │ ┌─────────────────────────────────────────────────────────────────────┘ ▼ [Transformer Primary] ──> [Power MOSFET] <──> [PWM Controller IC] ▲ (Optical Feedback) │ [Transformer Secondary] ──> [Schottky Diode] ──> [Optocoupler] <──> [TL431 Regulator] │ ▼ [Low-ESR Caps] ──> [DC Output Rail] Common Failure Modes and Troubleshooting Steps If you’ve landed on this page, you are
pin of the PWM chip. Measure their resistance with your DMM and compare it against their marked color codes or SMD numerical codes. Replace any resistor that reads open or significantly out of spec. Step 5: Testing Secondary Outputs for Shorts
These transistors drop the excess voltage to maintain the user-defined output. Sites like Badcaps
The power supply is entering "hiccup mode" to protect itself. Check the secondary Schottky diodes for a short circuit. Dried-out Electrolytic Capacitors