Re: Yamaha RX-V673 power problems

Today finally the bridge rectifier has arrived, managed to change it after 15 minutes of soldering a couple of swear words.. It's up and running!! The only thing that concerns me is the PS1 value, it is change constantly between 77-80 in diagnostic mode. Hopefully it's not gonna be the cause of the next problem.. And a HUGE THANK YOU to R_J for all the help and the information he provided!...

Re: Yamaha RX-V673 power problems

yes, I was thinking the same about the capacitor just wanted to hear it from a smarter person just tried to take the bridge of from the board with the heat sink on.. obviously I can't so probably will wait till the other bridge gets here then take the whole amp apart and do it in one run because the lack of space. will get back to you

Re: Yamaha RX-V673 power problems

So finally tonight I had some time. Disconnected the transformer measured the bridge and on pin 1-2 I have short the rest of the pins measure around 196ohm. When I measure the capacitors you mentioned C1084 is behave like short for about 3 seconds then the resistance slowly starts to climb up. whats the reason of this strange thing. Also on D1040 when I measured pin 3-4 it did the same thing, act as short for ~3sec then the resistance slowly climbed up to 196ohm. Strange.....

Re: Yamaha RX-V673 power problems

Yes I was measuring it in "diode test" and no the bridge was in the circuit with the transformer connected. Checked the bridge in continuity mode as well and pin 1-2 was short, pin 1-3 was short and 2-3 was short too. Thats because of the transformer?!

Re: Yamaha RX-V673 power problems

Thanks for the advice! You were right about my meter leads, they measure as 0.7ohm and get now 0.9 or 1ohm on the emitter resistors what I believe is good. In continuity the resistors should check as short? By the way I think you were right about the shorted D1040 bridge rectifier, last night I took apart the amp, checked it and only shows between 5-8 ohms while the D1041 shows around 5-600 ohms which is perfect for a diode?! So ordered a replacement RS603M and I'll see if it fix the issue.

Re: Yamaha RX-V673 power problems

Just checked the emitter resistors without taking them out and got 1.7ohm on the two side legs and 1.5ohm on middle and side legs. also checked the manual where is the d1040 rectifier and I did here i quite sparkling noise from that area when connected W104B and W102B. Didn't take the amp apart yet to check if there is anything blown and can't really see those parts there so will give it a try

Re: Yamaha RX-V673 power problems

Sorry I forgot to meantion that I put a new fuse in then disconnected the 90v line so the transformer was giving power out.Only disconnected the 90v from transformer, the 5v ac and 12v ac are still connected to the power amp board and the sp. terminal boards and when measuring the terminals I still get 0.45v on the C, SR, SL and the rest of the channels are having 0.10 volts only the zone 2 cennectors has 0v on it. Unfortunately can not measure the voltage on it with the transformer connected back because in that case the fuse burn out in 4 sec...

Re: Yamaha RX-V673 power problems

hello everyone,

I have the exact same amp as stated above but with a different issue. So the symptoms with my amp are the next. The 5amp fuse on power board was blown out, after replacing and turning the unit on it has blown straight away. With the blown out fuse I can enter self-diag. mode with the error code ps2 prt 30l. Of course it's gonne be low because no power coming out of the transformer. Then disconnected the 90v lines(5 cables) from transformer so power amp would stay off while left the 5v and 12v lines on. When powering...