Hello everyone,
I'm stuck finding the problems on this Yamaha receiver, i suspect a few things but after messing around the whole weekend it seems like i'm getting on a dead end. Must say, that i've not much experience with these newer devices and i'm a bit rusty.
First of all, i got this device from my friend.. The receiver's fuse went dead when he was just watching a movie.
So obviously, my first step was to get into the diagnostic mode (power sw+info+tone control from my head) and there it went fine with an error P2 (power supply 2, 34L 3.4 volt LOW?) i thought P2 should've been 3.3V so how did it went out that the power there is too low? anyways, before i even could analyze more, i simply removed a lot of dust and now the device won't turn on anymore either.
Previously, even the power led went on, now it's nothing. Obviously i checked all the cable connections.
So, my logic sense seems to be, previously we had the standby transformer/signal going properly, but even that is going crazy now.
For some reason, i can't get out of it properly with the schemes in the Service Manual for proper diagnostics, but if i am testing it right, the 5v and the 12v line both are way underpowered. But to be fair, i am not even sure if i am reading it from the proper points.
I will include the Service Manual as attachment of this post.
To me, the power relay doesn't switch and i think thats because it never gets it's 5v, just somewhere around 3,8v and that might be the problem.
Since i've been looking for problems the whole weekend, it might aswell be that i'm simply overlooking a simple thing as i'm looking way too far ahead.
The AC in is on the VIDEO 2 board, i suspect the problems lay on this PCB too.
If i'm thinking properly, the 5.5v DC comes from T3701 to D3704, end of D3704 gives me 3,8v where i'm sure this should be 5,6v?
Anyways, what also puzzles me is that the 12V line also is somewhere in the high 3v range?
Maybe a fresh pair of eyes, and someone with experience of newer audio equipment can help me out.
I can give measurement results as needed.
The service manual with all the schematics are here:
Thanks for any help
I'm stuck finding the problems on this Yamaha receiver, i suspect a few things but after messing around the whole weekend it seems like i'm getting on a dead end. Must say, that i've not much experience with these newer devices and i'm a bit rusty.
First of all, i got this device from my friend.. The receiver's fuse went dead when he was just watching a movie.
So obviously, my first step was to get into the diagnostic mode (power sw+info+tone control from my head) and there it went fine with an error P2 (power supply 2, 34L 3.4 volt LOW?) i thought P2 should've been 3.3V so how did it went out that the power there is too low? anyways, before i even could analyze more, i simply removed a lot of dust and now the device won't turn on anymore either.
Previously, even the power led went on, now it's nothing. Obviously i checked all the cable connections.
So, my logic sense seems to be, previously we had the standby transformer/signal going properly, but even that is going crazy now.
For some reason, i can't get out of it properly with the schemes in the Service Manual for proper diagnostics, but if i am testing it right, the 5v and the 12v line both are way underpowered. But to be fair, i am not even sure if i am reading it from the proper points.
I will include the Service Manual as attachment of this post.
To me, the power relay doesn't switch and i think thats because it never gets it's 5v, just somewhere around 3,8v and that might be the problem.
Since i've been looking for problems the whole weekend, it might aswell be that i'm simply overlooking a simple thing as i'm looking way too far ahead.
The AC in is on the VIDEO 2 board, i suspect the problems lay on this PCB too.
If i'm thinking properly, the 5.5v DC comes from T3701 to D3704, end of D3704 gives me 3,8v where i'm sure this should be 5,6v?
Anyways, what also puzzles me is that the 12V line also is somewhere in the high 3v range?
Maybe a fresh pair of eyes, and someone with experience of newer audio equipment can help me out.
I can give measurement results as needed.
The service manual with all the schematics are here:
Thanks for any help
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