elgrillo
El Grillo
Reading it now.
Short circuit connecting preamp with amp (RCA)
- Thread starter elgrillo
- Start date
Reading it now.
elgrillo
El Grillo
Mmm, I dont know if I understood right . But I think its a problem of a broken loop?
That ther is some part that Im not grounding well to the chassis?
petehall347
the brandy coffee man
petehall347
the brandy coffee man
it doesn't look shorted to ground .so that's good .
is the brown/black grounded good ?
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elgrillo
El Grillo
Conections to ground in the amp are like this.
In the relay board [pin 5] goes to Chasis (one metal leg that holds the board to chassis).[pin 6] goes directly to filter caps copper bridge.
In each amp board there is a BLACK WIRE that connects them directly to filter caps copper bridge too.
And finally the input RCA's shells connects to the amp boards lead that connects also to the BLACK WIRE.
The only thing that i dont undertand very much in the diagram is that in the RCA's for example J1 there is a ground symbol in the shell(2). But there is also a ground symbol in the inner side (1).
I changed the RCA's for gold ones BTW.
elgrillo
El Grillo
What do you mean with grounded good? Sorry for the ignorance.
It looks to be very well soldered to the copper bridge between the filter caps.
petehall347
the brandy coffee man
i meant a good solid connection
petehall347
the brandy coffee man
are the rca wires shielded ? i think it means the shield is grounded .and the rca outer shell is also grounded
elgrillo
El Grillo
Here are photos of the RCA's The wire that connects the RCA'a and the amp boards is the Original Marantz wire.
Attachments
petehall347
the brandy coffee man
i found an old thread with pictures so you can compare ..maybe you have already seen it though .
http://www.audiokarma.org/forums/showthread.php?t=267257
http://www.audiokarma.org/forums/showthread.php?t=267257
petehall347
the brandy coffee man
they look to be insulated from the chassis on the outer shell . according to the diagram they should be grounded .
did they not have grounding washers with solder tabs when you got them ?
elgrillo
El Grillo
Yep allready...
Do you think that maybe internally one wire is touching the metal case of the trafo and this conducting AC to the chassis? sorry if this is illogical or stupid.
elgrillo
El Grillo
Peter watching this photo
http://postimg.org/image/si6h5hdbv/
I realize that the wires in my amp are a little different.
The black/red wire and the black wire are inverted in the terminals of the fuse
http://postimg.org/image/si6h5hdbv/
I realize that the wires in my amp are a little different.
The black/red wire and the black wire are inverted in the terminals of the fuse
petehall347
the brandy coffee man
that wont make any difference with the fuse...
elgrillo
El Grillo
I realy dont know. I just got that.
But when I use the DMM in diode mode (continuity) and touch the outer shell and the chassis it beeps.
But when i touch the inner shell and the chassis no beep.
I can take the plasic washers from the RCA's if its needed. do you think thats tha problem? The New RCA's?
petehall347
the brandy coffee man
your resistance readings say not . did you have your meter on megohms ?
petehall347
the brandy coffee man
if you are getting the beep they are connecting good .. leave them as they are for now .
petehall347
the brandy coffee man
did you see this picture ?
i am not sure if the stand off is insulated or connects to the chassis ..maybe send a message to the poster and see if he can remember ..http://postimg.org/image/rp3izjjdh/
i am not sure if the stand off is insulated or connects to the chassis ..maybe send a message to the poster and see if he can remember ..http://postimg.org/image/rp3izjjdh/
elgrillo
El Grillo
Thanks Peter, do you think there is something more to do or somewhere to look?
IF I modify the wiring to work with a grounded plug (3 wired plug) do you think
that coul solve the problem? or its beter to stay with the original design?
elgrillo
El Grillo
im going to try that, hopefully he can give some advice.