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Author Topic: Yamaha RXV663  (Read 599 times)

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Offline geobeeTopic starter

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Yamaha RXV663
« on: January 31, 2021, 11:13:13 pm »
Hi all, this came onto the bench dead. Replaced the usual suspect, the 22Nf cap in the supply. Still no joy, on checking there is no 5 volt supply, lifted the secondary of the standby transformer, and the ac came back up, but in circuit something is loading it down. Checked several components downstream, but cannot point the finger at anything in particular. I have repaired many Yamaha amps, but this one is becoming a real challenge. Any ideas to check would be great. Cheers.
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Offline mzacharias

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Re: Yamaha RXV663
« Reply #1 on: February 02, 2021, 04:56:13 pm »


Yamaha green power supply analysis
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Offline mzacharias

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Re: Yamaha RXV663
« Reply #2 on: February 02, 2021, 05:08:11 pm »


waveforms
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