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Yamaha RX-V2095
Yamaha RX-V2095
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Old 22nd July 2019, 07:58 PM   #11
rex_johnston is offline rex_johnston  Norfolk Island
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Quote:
Originally Posted by deadpool View Post
yeah cool.. OP only paid a tenner for his unit...how much time did he want to throw at it?

I mean it can be repaired but you can also tie yourself in knots trying to...

A simple old 2 channel Yamaha amp would better for a novice to learn on
The ability to fix these things (which are essentially simple computers hooked up to a bunch of amplifiers) is entirely dependent on the quality of the documentation. No documentation, no fixing the amp. Great documentation, easy fix. Middling documentation, like the yamaha's, fixable with some head scratching, once you realize the design oddities.
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Old 22nd July 2019, 11:50 PM   #12
deadpool is online now deadpool  Australia
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I think Yamahas have the best documentation out of any modern brand

And very good protection circuits, once you understand how they work
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Old 23rd July 2019, 11:39 PM   #13
rex_johnston is offline rex_johnston  Norfolk Island
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I think Yamahas have the best documentation out of any modern brand
If you say so. I found the schematic a bit haphazard.

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And very good protection circuits, once you understand how they work
For reference (and they don't state this anywhere), various (but not all) DC rails are summed together through high valued (10-50k) resistors and poked into an A/D converter pin on the main CPU. That would be OK, if they didn't accompany it with summed voltages from the secondary windings of the main transformer, which should sum to zero, except when there is enough noise on the incoming mains to not sum to zero and trigger the dreaded PS PRT some random number error message then shut down. That is NOT ok. Cut those resistors out and stick a larger cap in the summing circuit for the rest of the DC rails.
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