Gunner Posted August 4, 2023 Share Posted August 4, 2023 The Sub-woofer control will not turn on. Such is a unit that is always on.... 2nd time it has happened. Last time a company now out of business fixed it. Anyone here have detailed instructions on how to repair this unit? A decent schematic or flow chart? I really like the bass from this unit If it is toast, which powered unit would you recommend ( used ) to purchase? Thanks for any helpful info. Rob Quote Link to comment Share on other sites More sharing options...
Gunner Posted August 4, 2023 Author Share Posted August 4, 2023 After a much closer look, I found it is a model 2-400. The fuse is good. I've got: 109.2 VDC at test points FO3 + FO4 53.1 VDC at test points W3 + W4 Nothing appears to be burned on any board. One capacitor may have leaked? Or is it a assembly glue? I'll pull the board and do a measurement and a closer look. Quote Link to comment Share on other sites More sharing options...
Gunner Posted August 4, 2023 Author Share Posted August 4, 2023 The "brown stuff" seems to be on several of the caps and appears to be brushed on. What caps I can get to will charge and discharge via my DVM. No true cap tester on hand. Quote Link to comment Share on other sites More sharing options...
Gunner Posted August 4, 2023 Author Share Posted August 4, 2023 I found the old repair. A resistor and a diode. Both Ohm out O.k Quote Link to comment Share on other sites More sharing options...
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