Bass Grounding Help

[Wxp4759cb]

Honestly just ask Roger to help you get it sorted.

I tried that by email. He told me it was between me and the dealer. So I’m trying to figure out if it’s a doable fix before deciding whether to return it or not. He did say I could file a warranty claim, but I’d im trying to figure out how serious the issue is before making a decision, since I assume wouldn’t be able to return it if I try to have it repaired under warrant. Maybe I should just return it though if it doesn’t seem like something obvious

 

[FunkHead]

I tried that by email. He told me it was between me and the dealer. So I’m trying to figure out if it’s a doable fix before deciding whether to return it or not. He did say I could file a warranty claim, but I’d im trying to figure out how serious the issue is before making a decision, since I assume wouldn’t be able to return it if I try to have it repaired under warrant. Maybe I should just return it though if it doesn’t seem like something obvious

I wish a few Sadowsky experts would chime in...
I looked at lots of Sadowsky control cavities and yours just looks odd.

 

[Spidey2112]

@Wxp4759cb, looks like you're in good hands... I wish you luck in getting this solved.

 

[Wxp4759cb]

This diagram looks closer:
[Invalid or Expired Link Removed]

The diagram says B236rE and the circuit board in the bass says B236rB (maybe the r stands for “revision” of the same board)

According to this the red is signal and the grey and green are ground: [Invalid or Expired Link Removed]

 

[Wxp4759cb]

Well, after a couple hours studying it I think the diagram in the previous post is correct. Every wire is plugged in the right place according to that diagram. My guess is there is something shorting in the bass/treble stacked pot as that is where touching the front of the bass has the most grounding effect. My electronics knowledge is pretty limited though.

It’s a real bummer since I really liked that bass. I guess the search will have to start over though.

 

[Wxp4759cb]

Is there a way to move this to pickups and electronics forum? I think I posted this in the wrong place and don’t want to get in trouble for spamming by creating the same post there

 

[DiabolusInMusic]

Is there a way to move this to pickups and electronics forum? I think I posted this in the wrong place and don’t want to get in trouble for spamming by creating the same post there

I've reported the post for you. This will get a mod's attention.

 

[JoeWPgh]

Does your control plate have continuity to the cavity shielding? If not, a small piece of copper or aluminum tape between the two might solve things

 

[Junker Bruce]

Have you tried taking a small screwdriver and very carefully make sure that the screws holding the wires in the green and black connectors are snug? Don't over torque anything, just make sure things are tight, easy does it! - If this does nothing then take it to a Luthier, they should have a good way of trouble shooting it. (my psychic prediction is that the issue could be whats called a cold solder connection on the pre amps circuit board) Whatever it is I hope its found and fixed and your enjoying that new to you bass soon!

 

[Wxp4759cb]

Have you tried taking a small screwdriver and very carefully make sure that the screws holding the wires in the green and black connectors are snug? Don't over torque anything, just make sure things are tight, easy does it! - If this does nothing then take it to a Luthier, they should have a good way of trouble shooting it. (my psychic prediction is that the issue could be whats called a cold solder connection on the pre amps circuit board) Whatever it is I hope its found and fixed and your enjoying that new to you bass soon!

I looked closely in the area you mentioned and to me it looks like there might be a bad solder joint on the far right where it says GD. What do you think? That is where the bridge ground connects

 

[Spidey2112]

I looked closely in the area you mentioned and to me it looks like there might be a bad solder joint on the far right where it says GD. What do you think? That is where the bridge ground connects

I'd say that's bad.

 

[Wxp4759cb]

I think we did it boys. Jiggling and tightening the black ground cable from the bridge where the questionable solder joint is makes the noise go away.

Still would like an opinion on that solder joint though. I don’t know enough about soldering to know for sure that that is a cold joint. If you guys think it is, I’ll take it to someone to resolder

 

[Spidey2112]

If the hum is intermittently on and off with the jiggling of the wire connected to that pad, it needs resoldered. It's not hard, but practice will ensure it doesn't happen again. If you don't feel comfortable doing it, check around... I bet a competent tech wouldn't charge much, to do just that...

... I'd do it for free, but that's me.

 

[Spidey2112]

Have you tried taking a small screwdriver and very carefully make sure that the screws holding the wires in the green and black connectors are snug? Don't over torque anything, just make sure things are tight, easy does it! - If this does nothing then take it to a Luthier, they should have a good way of trouble shooting it. (my psychic prediction is that the issue could be whats called a cold solder connection on the pre amps circuit board) Whatever it is I hope its found and fixed and your enjoying that new to you bass soon!

Nice job, JB! See? You were in good hands the whole time...

... you just didn't know it.