P Bass Problem

[elliotlo]

i am using a MIJ fender p bass

recently, i discover my bass's volume is too low (suddenly)

i checked the volume knob and the tone knob

the volume knob works okay

but when i turn the tone off (cut the tone)

the volume apparently becomes lower too (normally it won't)

is that any problem of the tone knob or is it a problem of my pickup?

how to check which part got a problem??

thanks everyone

[Telebass]

Probably best to look at the wiring - maybe a connection came off, in which case, easy fix with a soldering iron, so long as you can see where the wire came from. If not, the wiring diagram can be had from the Fender web site, here:-
[url="http://www.fender.com/support/diagrams/pdf_temp1/basses/0136100A/SD0136100APg2.pdf"]http://www.fender.com/support/diagrams/pdf...0136100APg2.pdf[/url]

[elliotlo]

[quote name='Telebass' post='537282' date='Jul 10 2009, 10:52 PM']Probably best to look at the wiring - maybe a connection came off, in which case, easy fix with a soldering iron, so long as you can see where the wire came from. If not, the wiring diagram can be had from the Fender web site, here:-
[url="http://www.fender.com/support/diagrams/pdf_temp1/basses/0136100A/SD0136100APg2.pdf"]http://www.fender.com/support/diagrams/pdf...0136100APg2.pdf[/url][/quote]

thx so much

did you mean i try to re-connect the wire with a soldering iron???

[Telebass]

Indeed yes. If you are sure where it came from!

[Musky]

That sounds like the signal might be bleeding off somewhere, perhaps a stray wire or the leads to the capacitor touching another component. When you take off the scratchplate it's worth inserting a jack plug to see if anything is being shifted about and making a connection it shouldn't be.

[elliotlo]

it's me again. i tried to rewire the pot and the capacitor following fender's diagram (http://www.fender.com/support/diagrams/pdf_temp1/basses/0190116C/SD0190116CPg2.pdf)
which my bass is a reissue 62 p-bass. Is the circuit the same as a reissue bass?

I try to bypass the tone pot it sounds normal. But after connecting to the tone pot it sounds like a volume cut for 50%. When I follow another circuit the tone sound is ok but the two knobs are reversed (anti clockwise volume up, clockwise for volume down) and i touch the volume knob it sounds "beez". Is that a wrong circuit?

I still can't fix my bass...poor.

[mrcrow]

that diagram is not the way i would connect the circuit
the tone cut on that comes before the vol pot which bleeds cut too early...tone cut should come on the outgoing signal from the vol pot else you start to set up an electronic circuit which works with cap and vol simultaneously...what that is i dont know but it doesnt give hearty signals when the vol is turned

[url="http://img505.imageshack.us/i/31030854.jpg/"][/url]

this is what i mean

below are mods to the diagram shown on the fender link...no disrespect to leo's heirs

swap the pup lead from pin 1 to pin 2 on the vol pot

disconnect the lead to the jack from pin 2 on the vol pot and connect to pin 2 on the tone pot

disconnect the lead on pin 3 on the tone pot and reconnect to pin 2 on the tone pot

reconnect the cap from pin 2 to pin 3 on the tone pot

all the earths should remain

that is the wiring for a P bass...the year doesnt matter

bassically.. ...hot leads go to pins 2 on pots on vol and tone and the transfer out signal from pin 1 on vol pots

Edited August 1, 2009 by mrcrow