Repair of various faults with a Yamaha RX-V550 Tuner-amplifier.

The mains power sampling capacitor C405 a 22nF 630v polyester capacitor had changed value over time and was preventing the unit from switching on.

Also a number of regulator had failed. After the C405 capacitor and the three faulty regulators were replaced the tuner/amplifier was working perfectly.

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