If you are looking at a verified schematic for this board, it likely follows a standard Switch Mode Power Supply (SMPS) topology:
: If the screen flashes briefly, the schematic is used to verify the resistance of the high-voltage inverter transformers. A mismatch in resistance between the two secondary windings usually indicates a failed transformer. wannien 101v0 power supply schematic verified
Measure the output pins. If you have 0V, check the startup resistor (usually a high-value resistor near the PWM IC) which provides the initial "kick" to start the switching process. If you are looking at a verified schematic
With the in hand, you are no longer flying blind. You can diagnose, repair, and even upgrade this versatile bench supply to last another decade. If you have 0V, check the startup resistor
To claim a schematic for the Wannien 101V0 is "verified," the following checks must be performed: