Hi guys, this fine piece of Yamaha gear is under new ownership. (Thanks Mid-Fi!) Though I've always been fond of Pioneers, I feel Yamaha nailed it with this series. I've never worked on any Yamaha gear, and am a novice, as I've only repaired about a dozen pieces, in a variety of types. (Turntables, receivers, reel-to-reels, equalizer...) But they were all Pioneer. Not familiar (at this point) with Yamaha terminology nor the "Yamaha way" of doing things. That's not a criticism, just an observation from a rookie.
Regardless of the gear, I don't know how to troubleshoot electronics. I can follow instructions, and don't jump all over the place. Can't read a schematic for crap, though.
So where're we at? I've opened up the beast and gotten access to the main Circuit Boards--I think Yamaha refers to both boards as Main Circuit Board 1?
I pulled TR611 and TR612 (1 from each board) and hit them with the diode test, they're all good. I then tested the outputs, TR613, TR614 (again, from both boards) and they all checked out good, too. (Testing done the six-way testing method.)
I've left them out of the boards for now. When they go back in, I'll clean off the the old thermal grease and apply new. (Clean off old flux, etc)
I'm not sure of the next step, and would gladly accept suggestions.
Thanks,
Jeff
PS I have a copy of the Service Manual as well as the three service bulletins