Harman/Kardon MAS 100 - SMPS Repair

In this video, I dive into a Harman/Kardon MAS 100 unit that came in with a "no power" / dead display issue. This was a challenging repair that involved tracking down the service manual, probing for missing voltages, and identifying some key component failures. If you enjoyed this deep dive, consider subscribing to Tech from Wreck for more hi-fi and electronics repair content! 00:00 Intro & Defect Description 01:42 Disassembly Begins 02:27 Testing the Connection Cable 04:27 Troubleshooting with the Service Manual 07:13 Successful Opening of the Unit 08:34 Probing for Voltages (15V and -5V) 11:13 Removing the Main Board 14:07 Identifying the Missing Component (DW6) 18:00 Finding the Damaged Capacitor 19:11 Schematic Review & Transistor Comparison 22:55 Inspecting the TIP32C Transistors 26:33 Discovering the Faulty 120k Resistor 31:52 Custom Resistor Fix (127k Replacement) 34:50 Re-soldering Components & Safety Test 37:06 First Power Up & Display Success! 37:55 Full Reassembly 42:33 Final Testing & CD Eject