Thank you Kyle and Bob.Here's a totally stock power supply board from my 2275 so you can check your work.
You tried every board fed by the 13V supply, one at a time? I would have thought a board pulling the power supply down, but not if each and every one pulled it down on it's own. I'm kinda throwing darts here, but are all the grounds good? No wires pinched or nicked?
Thanks Bob! Let me see if I got it right.Disconnect the feed off of J806 and put your ma meter on J806 and on the wire to see how much current is flowing .
Bob
Thanks! I'll do that tomorrow.Yes power on
You're just putting your dvm in series with the wire you pulled off of J806 to see how much current it's pulling which should tell you one of two things:
1) very little current which could indicate the P800 14vdc supply is suspect
2) relatively high current which probably means you have a shorted wire somewhere since you have already disconnected every board simultaneously.
I'm still betting on a short somewhere.
I would go to the small terminal board under the chassis that's just behind the preamp board but in front of the P200 board and separate all 5 or 6 wires there that feed out to the rotary switched ,pushbutton switches and boards .
You should be able to isolate which of the wires is dragging down your voltage.
Bob
Thanks @rBucknerNope, that's the power rectifier to feed the power amps. I think it's the terminal strip just to the left of that and just a tad lower. The bunch of wires are usually orange in Marantz receivers but may be red in a 2275. I haven't done one in quite awhile.