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In Reply to: RE: Mistakes were made... Yamaha CR-1000 posted by biomimetic on June 29, 2020 at 20:00:52
That's all I can think of.
Any damage done would've (should've) been between the filters installed backwards and the where the power cord plugs into the wall. ;)
That should narrow things down considerably, I would think.
Indeed, usually the caps pop and that's that -- replace the sacrifical caps and life goes on.
I have a CR-1000, but I bought it rehabbed so I don't really know much about the guts.You probably have the SM already, but, in case you don't, there's a good looking copy at the link below.
EDIT: The schematic is very clean; the P/S is complicated, I am attaching a screen shot showing the 'back side' of the P/S for various territories; looks like a smattering of "real" fuses therein(?).
Good luck!
all the best,
mrh
Edits: 06/30/20Follow Ups:
That is much appreciated... but crap... In some ways I would prefer a straight up change out.
It is producing some voltage, and the 50V at the power caps from the transformer. The 15-17V off the powerboards is definitely not there, and there is nothing at headphone in (which goes to the powerboard near the power caps). Getting around 8V at the speakers - not consistent across all posts like 8V-8V-8V-8V. More like: 5.6V-7V-6.1V-8V - which seems wrong (this is without tone).
Is it though?
I also can't find any obviously dead resistors or diodes...
Seems like maybe half the windings are good and half not - so the internal fuse in the transformer has gone?
The internal "fuse" is on the primary and is a thermal cutout, unfortunately usually non-resetting.
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