: Harman/JBL has occasionally offered superseded or substitute part numbers (such as TPS220200-0407) for this assembly to address common failures. Professional Sourcing
If you own a premium Harman Kardon home theater system and suddenly find your subwoofer has gone silent, the culprit is often a single internal component: the HYS3C210-CS power supply board hys3c210-cs
Official service manuals for Harman Kardon subwoofers often state that the power supply is a intended to be replaced as a whole module . However, community-sourced information and unofficial diagrams are sometimes available: hys3c210-cs
Reddit Troubleshooting Thread : Discussion on replacing the unit or diagnosing the 48V rail failure. hys3c210-cs