575 wiring diagram?

[mikemccue]

Hi,

I bought a used 575 last fall and it came with a buzzy bridge pickup.

 

I finally got around to looking at it, and it seems like the cover isn't connected to anything.

 

The neck pickup cover is connected to ground and I confirmed that the cases of all the pots are connected to ground.

 

I can make the buzz disappear with a small jumper connecting the neck pickup mounting screw to the tailpiece.

 

When I was checking the volume potentiometer for the neck pickup I noticed that the "brown" lead was wired as "hot" or "+" and the "white" lead was wired as "-", which is the opposite of what Schaller info I have been reading suggested I would see. The brown lead has continuity to the center pin at the output jack and the white lead goes to ground.

 

It seems like the white lead isn't connected to the neck pickup's cover.

 

My initial diagnosis suggests that I should pull the pickup cover and check for a connection to the cover... but the inconsistency in wiring color layout makes me wonder if there was some mod that I am not aware of so I'd like to learn if there is an official wiring diagram to compare to.

 

I'm real comfortable with solid body work but I'm a bit unsure of how far to take apart the stuff in a hollow body as it seems like you can only put it back together after you have learned what order to do each step in. :-).

 

Any ideas?

 

Thanks.

 

best regards,

Mike

 

 

 

[SouthpawGuy]

These might help .... my lefty 170, factory wiring with Schallers. The extra wiring is for VIP

 

 

 

And this ....

 

http://www.skguitar.com/SKGS/sk/Pickup%20color%20codes.htm

 

 

[hinesarchtop]

It sounds like the string ground is not connected. Unscrew the tail piece and see if there is a wire smashed bettween it and the body. This would go through a small hole and connect to the common ground. The schematic should be like that of a Lpaul or H150. Make sure you use the proper size screw driver as it's easy to strip the tail piece screws.

[mikemccue]

Hi,

Thanks for the replies.

 

The tail piece, the strings, the switch, the 4 potentiometers, and the neck pickup are all grounded well. I checked all that today.

 

The actual cover of the bridge pickup doesn't seem to be grounded. It doesn't act as a shield and the noise gets worse if I touch with my fingers while playing finger style.

 

My guess is that the nature of the hum bucking coils and use of a pick may have made the problem hard to notice. I noticed because I play finger style and went looking for the shielding problem (by placing it close to a noise source) once I noticed the issue.

 

 

 

 

When I was testing for ground with a VOMeter I noticed that the wiring layout doesn't seem to be the traditional Les Paul 2 pickup, 2 vol, 2 tone, & 3 way switch layout.

 

I'm trying to understand what is going on better so I can consider whether someone made a mod where they purposefully disconnected the bridge pickup cover from ground. I used a small mirror to make this sketch of the existing layout. I think it's accurate but I was having difficulty seeing everything.

 

 

 

I'm trying to figure out how much stuff I have to remove so I can get a look at it and work on it.

 

Any advice welcome.

 

I'd gladly pay a local repair tech to do this... but there is no one local with any particular experience in hollow body and I have plenty of, if not more, experience on solid body stuff than the few local working techs so I think I may have to fix it myself or send it off to someone who has the actual experience with hollow body assemblies.

 

Thanks again.

 

 

best regards,

mike

[schundog]

First of all, welcome to the HOC, Mike. If you stick around, I think you will find, as I did 3 years or so ago, that it is a great place to hang out and meet some wonderful like-minded people.

 

Good luck with your wiring issue; I wish I could help, but I'm useless in such matters, haha. I DID just get a 575, though, so we've got THAT in common. Peace!

 

Brian

[hinesarchtop]

For standard humbucker operation Schallers are usually wired with yellow as hot...........green and bare together, and brown and white together. Green and bare soldered to ground. It sure sounds like a grounding issue.

[hinesarchtop]

Also, you have no ground circuit in your diagram.

[bolero]

looks like white ( from the pickup lead ) is the ground?

 

 

I always refer to these diagrams to sort out wiring, there is a vintage style & a modern style commonly used

 

 

 

 

I have seen an extra ground wire added that connects all the vol & tone pots as well

[58super]

Did you actually check to see if the cover was soldered on?

[mikemccue]

Hi,

Thanks again for the replies.

 

The potentiometer shells are grounded... I just left those connections out of the sketch for clarity.

 

The pickup cover is soldered to the pickup assembly... that is why I haven't looked inside it yet.

 

I would expect that the white wire should be connected to the pickup frame under neath that cover... but every measurement I take suggests that it is not. I did check to see if the brown was... but it is not either.

 

I think I need to remove the cover and see what is going on.

 

I watched a bunch of youtube videos yesterday and now I have a feel for the procedure for removing the wiring harness and setting it all up properly. I think I'll check under the pick up cover first and go from there.

 

 

Thanks again.

 

 

Best regards,

mike