Adjusting active EQ in passive mode still seems affect tone?

[roman_sub]

Hi guys

I'm a recent and v happy owner of a 2012 Fender USA Precision Deluxe (P/J, active / passive tone controls). I'm loving it, but I noticed that when it is in "passive" mode, changing any of the 3 EQ controls seems to have an effect on the tone. I haven't opened up the bass, but I found this a bit strange. It's not drastic, but I can hear the difference when turning the EQ knobs...

is this normal? is the active EQ, even nominally bypassed, still loading the pickups / circuit somehow? or is this likely a "defect" -either due to Fender's circuit design, or maybe how prior owner wired in the new passive Dimarzio pickups?

Would appreciate any experiences with other active / passive circuits...

many thanks
Roman

[roman_sub]

anyone?

[ikay]

Er no idea! In the circuit below (USA active Jazz) the active/passive switch completely bypasses the eq when switched to passive. I'm not sure if this is the same circuit as in your bass, it could be an earlier version.

[URL=http://s1090.photobucket.com/user/iankay/media/Stuff/Fender%20USA%20deluxe%20jazz%20eq%20circuit.jpg.html][IMG]http://i1090.photobucket.com/albums/i370/iankay/Stuff/Fender%20USA%20deluxe%20jazz%20eq%20circuit.jpg[/IMG][/URL]

[markstuk]

Maybe it was modded by a previous owner ?

[roman_sub]

different circuit (has 3 band EQ, plus passive tone) to the one posted above, but thanks. Looks like bass exploratory surgery it is!