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Rick schematic questions
Posted: Fri Jun 14, 2002 1:58 pm
by d_funkie
Hi there. I was looking up 4001 wiring schematics and I got really confused about the pickup selector switch. the output jack was three way toggle, but there were four poles. and after looking at the two capacitors (labelled C1 and C2) I saw a third one that was .0047 instead of .047. Is the selector switch thing just for the stereo? and why are the pots labelled R? And what is the purpose of the one right near the output jack? If the link doesnt work at the bottom of this message its because that it's my first time trying to link anything.
and don't take offense to the "junk" folder. I keep all my guitar information in there.
/image{C:\mydocuments\Dan\junk\4001wiringschematic.gif}
Posted: Sat Jun 15, 2002 4:42 am
by admin
Funkie Dan: Just give it another try making sure that your gif is less than 15k and that you use the "\" slash with the image function, hence "\image"
Posted: Sat Jun 15, 2002 5:08 am
by d_funkie
C:\my documents\dan\junk
4001wiringschematic.gif
Posted: Sat Jun 15, 2002 9:11 am
by markthemd
Answer ;
Potentiometers are variable resistors. In this case both 250K and 500K variable resistors are used . That is why they are labled "R" .
The capacitors (.047mfd) are for the tone controls.These shunt high end to ground/earth.As you turn the pots , the type of taper of the pot signals how much/at what ratio , the high end goes away , th ecap tell the circuit how much high end to go away.
The .0047mfd is a cap that is in line and as the signal passes through it , it chokes off a certain amount of low end and this in turn gives that distinctive Rick vintage tone , and at th asamr time , it also remove a bit of output.
That is why the bridge pickup in a 4000 series bass was a higher resistance /output .This cap evened things out .
The WHOLE circuit is Stereo until you plug into the mono jack .At that point there is a switch that connects both neck and bridge pickups into mono.
Posted: Sun Jun 16, 2002 11:32 am
by d_funkie
I am still confused about the switch and the extra R (R5) near the output jack.
Posted: Sun Jun 16, 2002 1:48 pm
by markthemd
The selector switch has 4 soldering lugs ....two are inputs and two are outputs .
When an input and output are connected , then that pickup is 'connected' , when the switch is in the center location/position then all lugs are touching and both pickups are 'ON' .
The extra resistor/pot is for the mystery 5th knob .That is the small knobbed control on a 360-12 stereo or on a 4005 stereo bass.It is the SAME wiring harness for both instruments.