Hi, I am a casual Hi-Fi enthusiast. My proud possessions are a Denon AVC 1530 Pro Logic Amplifier, Sony STR-DB930 Receiver and a Sony STR-DH550 Receiver. Accompanying these are custom-built front and center speakers and a pair of Sonodyne LS501 bookshelf speakers for surround. The AVC1530 and STR-DB930 are not exactly functioning. I am hoping to get some good advice from folks here in fixing them.