How to Bench Test a Stereo Receiver by Isolating Each Functional Block - Featuring a Sansui 9090DB

In this video I draw a generic stereo receiver block diagram and use it to strategically test a Sansui 9090DB receiver at the bench to gain the maximum amount of information to present to the customer. I cover tape inputs and outputs, how to test a phono stage and tuner, and how to use the preout / main in jacks. 00:00 Introduction 00:43 Block Diagram 03:48 Internal Visual Inspection 04:47 Dim Bulb Power On 05:43 Testing the Phono Stage 08:23 Testing the Tuner 11:27 Testing the Preamp 15:56 Diagnosing the Channel Imbalance 17:27 Testing the Power Amplifier 21:22 Testing Summary