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Posted: Fri Apr 30, 2010 2:35 pm
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Lefty guitar wirig by Fender;

http://www.fender.com/support/diagrams/ ... 22BPg2.pdf


Also go to see lefty wiring picture

http://www.axeblaster.com/wiring/LeftyMexicanSSS/


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Posted: Fri Apr 30, 2010 2:42 pm
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Go there they have lefty picture and wiring

http://www.axeblaster.com/wiring/LeftyMexicanSSS/


And for Fender lefty diagram;

http://www.fender.com/support/diagrams/ ... 22BPg2.pdf


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Posted: Fri Apr 30, 2010 2:48 pm
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I have a multimiter but I cannot figure our myself if the pot was lefty.

Not to use that with my tech replaced the stock one ( and I don't know if it is lefty or righty ) but the volume comes in a strange way.
It's like the pots act just 20% of its use.

With the new installed we tried to invert the wirings just to test that too.
Doing that we changed the type of response of te pot, 1st was operative near the end on the turn, 2nd open at the beginning and quite the same turning all the way...
So or are the pups strange or I don't know ... :(
I spent money for nothing :(
new set of pups and tech charging..
:(


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Posted: Fri Apr 30, 2010 2:52 pm
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strato80 wrote:
I have a multimiter but I cannot figure our myself if the pot was lefty.

Not to use that with my tech replaced the stock one ( and I don't know if it is lefty or righty ) but the volume comes in a strange way.
It's like the pots act just 20% of its use.

With the new installed we tried to invert the wirings just to test that too.
Doing that we changed the type of response of te pot, 1st was operative near the end on the turn, 2nd open at the beginning and quite the same turning all the way...
So or are the pups strange or I don't know ... :(
I spent money for nothing :(
new set of pups and tech charging..
:(


thanx so much I'll take a look tomorrow morning, I'm at work now!


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Posted: Fri Apr 30, 2010 4:12 pm
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this place sell lefty pots, look at the picture;

http://www.guitarelectronics.com/produc ... o_Pot.html

And All Parts sell some too, I read

Are you shure that your pot are lefty ?
If the answer is yes, check your wiring

If no, buy lefty pot.

I find that on www.guitar electronic.com


Audio and Linear taper pots have the same total resistance but differ in which position of rotation the pot will reach the 50% value. Linear pots are usually marked with a B or Lin (examples 250KB, B250K, 250K Lin) and will reach 50% of its total resistance in the 50% rotation point. Audio taper pots are usually marked with an A or Aud (examples 500KA, A500K 500K Aud) and will decrease most of the resistance in the last 50% of the rotation. This can give a more gradual audio reduction is some cases. Some manufactures like Fender use Audio taper pots for both volume and tone controls. Gibson on the other hand uses linear taper pots for both volume and tone. And still others use Linar taper pots for volume and Audio taper pots for tone. However, if a problem of exists where a volume or tone pot has no effect on the sound, try a changing the taper. How to check the taper with an ohm meter: Set the pot to the center position (50% rotation) and measure the resistance between the center pin and each of the outer pins. If the the resistance is equal (50% of the pots value) the pot is linear. If the values are not equal, the pot is an Audio taper.


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Posted: Fri Apr 30, 2010 11:26 pm
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There's something wrong in the wirings ..
The actual pot installed is the stock one so it must work like it does before.
Looking the circuit everything seems ok, my tech just did the same wiring it was before the pick up swap.

can the problem be that pot's ground lug ( right lug connected to the pot -ground ) is connected with both:

black ground of jack;
spring claw;
monting screw lug ?


i see these grounds are in contact together on the same contact between the lug over the volume pot... maybe they might be seprarated...and with another point of solder...

Image
Image
Image


Last edited by strato80 on Sat May 01, 2010 2:55 am, edited 2 times in total.

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Posted: Sat May 01, 2010 2:15 am
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stratele52 wrote:
this place sell lefty pots, look at the picture;

http://www.guitarelectronics.com/produc ... o_Pot.html

And All Parts sell some too, I read

Are you shure that your pot are lefty ?
If the answer is yes, check your wiring

If no, buy lefty pot.

I find that on www.guitar electronic.com


Audio and Linear taper pots have the same total resistance but differ in which position of rotation the pot will reach the 50% value. Linear pots are usually marked with a B or Lin (examples 250KB, B250K, 250K Lin) and will reach 50% of its total resistance in the 50% rotation point. Audio taper pots are usually marked with an A or Aud (examples 500KA, A500K 500K Aud) and will decrease most of the resistance in the last 50% of the rotation. This can give a more gradual audio reduction is some cases. Some manufactures like Fender use Audio taper pots for both volume and tone controls. Gibson on the other hand uses linear taper pots for both volume and tone. And still others use Linar taper pots for volume and Audio taper pots for tone. However, if a problem of exists where a volume or tone pot has no effect on the sound, try a changing the taper. How to check the taper with an ohm meter: Set the pot to the center position (50% rotation) and measure the resistance between the center pin and each of the outer pins. If the the resistance is equal (50% of the pots value) the pot is linear. If the values are not equal, the pot is an Audio taper.



hi, i bought it for lefty. btw me and my tech tried to replace the old that IS correct and probably lefty. but with no benefits.

so it is something on the wirings...Pups are not breathing..they're suffocated.


pots are A for sure.

what to check with a multimiter if it is righ or lefty?
i saw a video that showed how to do that but it wasn't that clear...
thanx!


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Posted: Sat May 01, 2010 3:18 am
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I tell you how to check a RIGHTY pot, so if you have a lefty one it should be very different.

Ok,
1- Put the pot on a table, shaft front of you
2- turn shaft full clockwise
3- Connect the lead of your multimeter , ohms scale
4- One lead on the center lug of your pot, other lead on the left lug of your pot.

5- You should read close to 1 ohms if it's a righty
6- If it's a lefty you 'll read close to 250 k ohms ( 250,000 ohms)

Another hit:
If you put a righty pot on a lefty guitar, your volume ajustment will be : no volume at 0 and full volume at 4 or 5. No difference between 5 to 10
So you see it wont work well.


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Posted: Sat May 01, 2010 3:22 am
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And if you want to reach some guy in this forum who know guitar very much, ( is name ; aclempopi) ask your question on the Stratocaster guitars post.


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Posted: Sun May 02, 2010 5:38 am
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Problem solved!
Me and a friend of mine or better him unplugged everything and checked the whole electronics.
We cut the tip of some wires redid every single soldering on the volume pot.
We re-replaced my new lefty vume pot and solder everything on it.
Seems now we fixed the problem....
Then I guess Lace Sensor pups must be very close to string otherwise you get low output from them, isn't it?

The lesson is :
don't trust at that kind of techs that say : it's strange.. I don't know.. And so on.
It's better to check to the real center of the problem..

Thanx so much guys!!


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Post subject:
Posted: Sun May 02, 2010 7:22 am
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Good news.


Next time before you give your guitar or amp to repair, ask some questions


Who are you to call yourself a technician ?

Where do you study electronics in guitar (or amp) ?

And what are your experience WITH that kind problem ?


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Posted: Sun May 02, 2010 7:48 am
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The point is that shop is autorized by Fender ...


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Posted: Sun May 02, 2010 11:46 am
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strato80 wrote:
The point is that shop is autorized by Fender ...


This is what I've been saying over and over again: Just because a shop is authorized by Fender and/or anyone else for that matter, it doesn't necessarily follow that the service personnel is competent. Even someone who knows absolutely nothing about electronics can clearly see this wiring is a disgrace where even more disgraceful, the 'tech' (read, "hack") has no clue regarding what is wrong with even his own wiring! :roll:

_________________
You dig?


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Post subject:
Posted: Sun May 02, 2010 12:01 pm
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Some of them lack in experience on the instruments...They have the rights to " assist" a brand...

He laughed the 1st time I told him I bought a left handed pot.
Then inverting the ground on the lug to test if it could work in that way he said I'd have to turn the pot on the other way.. But again he wasn't right..
The pot
worked on the same direction but with another type of response.

Surely my money was good...

In the end he told me it was strange...
He just followed the diagram... The rest you know from previous messages..

;)


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Post subject:
Posted: Sun May 02, 2010 12:12 pm
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stratele52 wrote:
I tell you how to check a RIGHTY pot, so if you have a lefty one it should be very different.

Ok,
1- Put the pot on a table, shaft front of you
2- turn shaft full clockwise
3- Connect the lead of your multimeter , ohms scale
4- One lead on the center lug of your pot, other lead on the left lug of your pot.

5- You should read close to 1 ohms if it's a righty
6- If it's a lefty you 'll read close to 250 k ohms ( 250,000 ohms)

Another hit:
If you put a righty pot on a lefty guitar, your volume ajustment will be : no volume at 0 and full volume at 4 or 5. No difference between 5 to 10
So you see it wont work well.


I missed this, thanx!
Now the new lefty pot is on the guitar I cannot do this test anymore.
I could do this to the older one.
After disconnecting the lug from ground.

EDIT : i found that test from another post.

I don't remember if the measurements were made with the bottom or top of the pot facing me! :P probably the 1st test was with the flat bottom facing me.

NEW -left handed cts 250k volume pot-
results are:


left end + wiper probes
readings:

258k when the pot is open ( counter clockwise)

0k pot closed ( clock wise )

----------
258k clock wise - pot full close
0k count-clockwise pot full open

wiper + right end



258k and slight variation when twisting the pot with the 2end probes connected. (This demonstrates it's working).
------------------

OLDER ONE STOCK from Fender / 250k
I'm measuring the resistance with the lug (right one from the bottom) still connected to the pot.

pivot-shaft facing me and closed / clockwise:
left lug + center = 0 k
271 k when opened count-clockwise;

right lug + center / pot closed clockwise:271k;
pot count clockwise open : 0k

so I have to think they're both lefty, aren't they?


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