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Trouble Shooting Hum In '89 MIJ Fender Jazz

Discussion in 'Pickups & Electronics [BG]' started by skypn, Mar 20, 2014.

  1. skypn


    Feb 8, 2011
    Here's where I'm at....

    Back story
    I have ts'd a lot of different systems, 1st time on a bass guitar:)

    I don't think it's a grounding prob cuz I metered from plug ground to bridge, and got a .001, all string are 000, and 000 strings to bridge screw...(could be wrong)

    I found the hum got louder as I turned up the pots, both pots. First the front, then the rear...

    I took out the, for lack of proper term, the pot plate, checked connections and still the same problem.

    I think it may be a wiring problem, or a shielding problem, as I got the same results with the plate in place as with it "hanging" from the bass.

    I found a copper plate in the bottom of the cav.

    Now here's my question...

    At this point do you think it may be the pots, or the pups/ wiring to the pups...I didn't want to open the pups unless I have to

  2. Look in the 'stickies' section for 'Jazz Bass Shielding.'