The schematic will show specific terminals for sensor inputs.
Drops mains voltage (110V/220V AC) down to a stable intermediate DC bus voltage (usually 5V, 12V, or 24V DC depending on the specific revision).
If your WLX896B unit is completely dead, intermittently disconnecting, or failing to fast-charge, follow this structural testing methodology. Phase 1: Visual Inspection (Unpowered)