Black Tune O Matic ...
 
Share:
Notifications
Clear all

Black Tune O Matic ABR bridge  

  RSS

Clinton
(@clinton)
Customer
Technician
Rep Points: 563
Joined:5 months ago
Posts: 116
18/09/2020 11:10 am  

  I had an issue with EarthLink grounding to a black ABR 1 tune o matic bridge. It was not receiving proper grounding. Practically spent the whole day re assessing, re wiring and soldering, figuring out schematics, replacing pick ups, jack socket, the works and even turning off the main powerline and using a battery operated amp to check for 60 cycle hum, nothing worked.  I was ready to order shielding paint and realized the black paint on the bridge and long behold  the paint in the bridge prevented it from conducting. I scuffed the areas of the posts, the slots and the string ball holes and it worked. Did anyone else ever came across this issue?

 

Clinton 


Boo, tv1 and Deej liked
tv1
 tv1
(@tv101)
Luthier
Rep Points: 4027
Joined:5 months ago
Posts: 696
18/09/2020 12:05 pm  

Never!

I've used a variety of bridges, and never experienced that problem.  If it's any consolation, it would probably have taken me longer to diagnose and resolve too.  Something to keep in mind for future builds, so thanks for sharing.

I guess that's a good example of the "check continuity" rule from Mark's session on Weds!

This space available for rent.


Boo and Deej liked
ReplyReplyQuote
darrenking
(@darrenking)
Customer
Luthier
Rep Points: 1354
Joined:2 years ago
Posts: 378
18/09/2020 7:51 pm  

I guess anything with an applied surface colour or lacquer is going to benefit from being abraded where the grounding wire  contacts. If you don't have on then cheap multimeter could be a great Christmas present. An audible continuity signal is very useful or you can can just check for low or out of range (on the low side) resistance.


Deej, Boo and tv1 liked
ReplyReplyQuote
Clinton
(@clinton)
Customer
Technician
Rep Points: 563
Joined:5 months ago
Posts: 116
18/09/2020 9:27 pm  

@darrenking Yes, wish I had a multimeter. My birthday coming up in a few weeks. Hmmm.


Deej, Boo and tv1 liked
ReplyReplyQuote
darrenking
(@darrenking)
Customer
Luthier
Rep Points: 1354
Joined:2 years ago
Posts: 378
18/09/2020 11:30 pm  

You can get a pretty good one on Amazon for less than £20 and if you are getting involved with anything electrical it’ll change you life!


Deej, Boo, tv1 and 1 people liked
ReplyReplyQuote
Clinton
(@clinton)
Customer
Technician
Rep Points: 563
Joined:5 months ago
Posts: 116
19/09/2020 3:50 am  

@tv1010101 I missed that one. Did not wake up in time. Shucks. Just saw the stream. I think it’s time I own a multimeter.


Deej, Boo and tv1 liked
ReplyReplyQuote
tv1
 tv1
(@tv101)
Luthier
Rep Points: 4027
Joined:5 months ago
Posts: 696
19/09/2020 8:32 am  

I think it’s time I own a multimeter.

I bought one for guitar-assembly use, long before I understood all of its other potential uses.  It encouraged me to learn a bit more about electronics!  

This space available for rent.


Deej and Boo liked
ReplyReplyQuote
Boo
 Boo
(@boo)
Customer
Luthier
Rep Points: 4159
Joined:2 years ago
Posts: 678
19/09/2020 10:40 am  

Ok you lot have convinced me that I should invest in a multimeter. Doesn’t know how to use it but it’s time learn. Thanks. 

Instagram - jacknifecustomguitars


Deej and tv1 liked
ReplyReplyQuote
rockpile99
(@rockpile99)
Enthusiast
Rep Points: 48
Joined:4 weeks ago
Posts: 11
02/10/2020 3:22 pm  

Had a similar experience with my first build. The bridge is black so I just assumed whatever it was coated with wouldn't conduct and tested first (thankfully I have multimeter) - had to scrape away the paint to get to copper/brass stuff underneath before bridge earth would conduct properly.

So far, the multimeter has also come in handy for veryifying ohms on pots, that pots are working properly, confirming uF value of tone capicitor, and generally checking my wiring skills.

Well worth the investment.


Boo, tv1, Deej and 1 people liked
ReplyReplyQuote
Clinton
(@clinton)
Customer
Technician
Rep Points: 563
Joined:5 months ago
Posts: 116
03/10/2020 2:10 am  

@rockpile99 Yup, just got one. Lessons learned.


Boo, tv1 and Deej liked
ReplyReplyQuote
darrenking
(@darrenking)
Customer
Luthier
Rep Points: 1354
Joined:2 years ago
Posts: 378
03/10/2020 1:41 pm  

 Just be aware that not all multimeters can measure capacitance so double check beforehand


Boo, tv1 and Deej liked
ReplyReplyQuote