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Post subject: Change PickUp for Fender Jazz Bass (MIM) - Part 2
Posted: Mon Apr 29, 2013 11:43 am
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Hello man :)

Continuing the open discussion here > http://forums.fender.com/viewtopic.php?f=10&t=85243, I had a doubt;

As already mentioned, I ordered the "Fender Original Vintage Jazz Bass", and with the advice of BrotherDave, I understood many things.

My question is simple:
Where can I find the wiring diagram for the JazzBass (1991-92)?

I searched a lot on the site of Fender, but I have not found anything. Well, I know that I can do it like the original, but I want to see if I can improve the scheme of bass.

Thanks

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Post subject: Re: Change PickUp for Fender Jazz Bass (MIM) - Part 2
Posted: Mon Apr 29, 2013 8:42 pm
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My favorite Jazz diagram is the JACO diagram. it is pretty much the standard vintage diagram for a Jazz Bass. You can view it here:

http://guitarnucleus.com/gitschems/FenJacoJazzSchem.pdf

Re-read your other post. You are seeking more sustain and output. The new pickups may help in output but maybe not so much in sustain. Check into new strings also. Maybe a high mass bridge also. Part of sustain comes from the strings, the nut, the bridge and the neck/body woods. Any weak link can cause short sustain. Also compression helps sustain a LOT.


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Post subject: Re: Change PickUp for Fender Jazz Bass (MIM) - Part 2
Posted: Tue Apr 30, 2013 11:50 am
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+111 :D

Many thanks brotherdave, as always accurate and precise. Thanks also for the JACO diagram; I will develop this diagram :)

Fortunately I found the .05 uf capacitor, but I did not understand a thing:

GROUND WIRES -- ok
FROM PICKUP SHIELDS -- ??
AND CONTROL SHIELD -- ??

this situation has me confused ... now, I have not disassembled the bass, (because we are playing) and I can not understand those two masses where they run...

However, Thanks again for you help

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Post subject: Re: Change PickUp for Fender Jazz Bass (MIM) - Part 2
Posted: Tue Apr 30, 2013 2:07 pm
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Jaco models used the brass shielding baseplate under the pickup so the components in the cavity are stacked in order from bottom to top as brass baseplate/foam/pickup. In arrangements like this the ground wire from the pickup is often seen wired to the baseplate itself (such as on a 62 P-Bass RI), and then another black lead runs the ground from the shielding baseplate to the control cavity. However in the Jaco circuit the pickup grounds and the shielding baseplate grounds are actually separate leads running to the control cavity. It makes perfect sense to me signal integrity-wise to take the shielding plates out of the direct signal path, but of course you still need to ground the baseplates for effective shielding and thus the two extra ground wires you see in the Jaco diagram.

I pretty much do that exact same thing with my single coil first generation P-Basses using copper foil shielding tape as I also run a separate ground wire for the pickup cavity shielding and keep the shielding out of the direct signal path. What I like best about copper tape is that it is completely removable from the cavities so you can put it back to original trim in a few minutes with no real harm done and it adds almost no height at all to the pickup.

The baseplates are seen as Fender part numbers 0019659000 and 0019662000 and look like this:

Image

So if you don't have the brass pickup shielding baseplates now or copper shielding tape now, just skip that part of the diagram, or you can install the plates as they are available from most Fender parts dealers or better yet you can substitute copper shielding tape and install that instead of the baseplates. The plates are relatively cheap and can help with RFI if using true single coil J-Bass pickups, but I prefer the copper shielding tape because it can also shield the sides of the pickup cavities instead of the bottom only and helps you get the shielding on the back of the pickguard grounded. I find the copper tape more thorough but I concede that it is more labor intensive and time consuming. A copper tape shielding job can take several hours.

When I finish a shielding job, the only electronics not shielded will be the very front of the pickups and the inaccessible wiring channels.

Also, on a Jazz if the back of the pickguard isn't already fully metal shielded I will fully copper shield it too. Often part or all of the back of the guard will already be aluminum tape shielded, but this shielding is not grounded to anything in factory configuration. To connect the shielding on the pickguard to ground on a Jazz one would overlap the copper shielding tape from the neck pickup cavity onto the top of the instrument a bit so that when the shielded pickguard is installed the copper (or aluminum) shielding on the back of the pickguard contacts the overlapping copper from the pickup cavity.

Since the control plate is conductive metal you don't need to put copper tape on the back of the control plate, but you do need to cover the entire control cavity with copper tape connected to ground, and again I overlap the copper tape over the rim of the control cavity so it contacts the control plate and that grounds the cavity shielding tape. It is probably more thorough to run a separate ground wire from the control cavity copper shielding to the volume control ground, so that is usually what I'd do.

Yes they use shielding paint these days on some models. In my opinion shielding paint is better than nothing at all, but it is not quite as effective against RFI as copper tape shielding to ground.

You can't make a single coil bass 100% immune to RFI, but a big improvement is possible for under $15 for the foil and a little ground wire plus a few hours of your time.

For more on how to do this, read the SHIELD YOUR BASS segment on this page:
http://brotherdave.com/add_maint.htm


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Post subject: Re: Change PickUp for Fender Jazz Bass (MIM) - Part 2
Posted: Tue Apr 30, 2013 4:31 pm
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1000++

Mr BrotherDave, I have read this your beautiful post while I drank a glass of wine "Pecorino" (typical area of Abruzzo) and I was fascinated... No Hands...and No Hum! :D

I'm really happy, because this your detailed explanation pointed out to me many things. I think of spend a few hours for the shield of the Bass, and I think that it is possible also on my Strato! Hahahaahah :lol: Basically, I need to fill all cavities with copper and connect the masses (as in the diagram)... however, a "metallic" paint is not advisable... or no?

Again, many thanks for your tip and advice!

Edit: Is possible do this? http://www.fralinpickups.com/bplate.asp (logically with the bass pickup)

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Post subject: Re: Change PickUp for Fender Jazz Bass (MIM) - Part 2
Posted: Tue Apr 30, 2013 5:09 pm
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I'd just use the copper foil tape. The process for Strat pickups on the Mr. Fralin's site also works. Copper tape is more thorough than just a baseplate, which is what he is talking about, because the tape can be applied to the bottom of the cavity under the pickup, up the sides of the cavities and also over the lip of the neck cavity on a Jazz to contact the shielding on the back of the pickguard.

As I mentioned shielding paint is used by some manufacturers because it works better than nothing and goes on in a flash, but the paint is not as good as a copper tape shielding to ground and usually if shielding paint winds up grounded then it is merely by chance that it does so. I like to purposely ground the pickup cavities and not leave it to chance. Yes I have put copper foil OVER shielding paint!


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Post subject: Re: Change PickUp for Fender Jazz Bass (MIM) - Part 2
Posted: Wed May 01, 2013 11:35 am
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brotherdave wrote:
I'd just use the copper foil tape[...]because the tape can be applied to the bottom of the cavity under the pickup, up the sides of the cavities and also over the lip of the neck cavity on a Jazz to contact the shielding on the back of the pickguard[...]


Yes, really I have thought about what you said, and is the best solution ;) :D

I already own copper foil (thickness 0,5mm for embossing and chasing) but no tape... I have to necessarily buy copper foil tape, or can I fit those in my possession? The problem would be how to attach the foil copper with the wood of the bass... double-tape?

Thanks again brotherdave

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Post subject: Re: Change PickUp for Fender Jazz Bass (MIM) - Part 2
Posted: Wed May 01, 2013 12:16 pm
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MedalHellway wrote:
brotherdave wrote:
I'd just use the copper foil tape[...]because the tape can be applied to the bottom of the cavity under the pickup, up the sides of the cavities and also over the lip of the neck cavity on a Jazz to contact the shielding on the back of the pickguard[...]


Yes, really I have thought about what you said, and is the best solution ;) :D

I already own copper foil (thickness 0,5mm for embossing and chasing) but no tape... I have to necessarily buy copper foil tape, or can I fit those in my possession? The problem would be how to attach the foil copper with the wood of the bass... double-tape?

Thanks again brotherdave


I'd just get the copper tape. It's reasonably cheap. Also on a Jazz I'd want a solid copper self adhesive sheet. Guitarpartsresource dot com has the better quality tape and sheet. I've tried other sources and GPR's is better quality.


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Post subject: Re: Change PickUp for Fender Jazz Bass (MIM) - Part 2
Posted: Wed May 01, 2013 12:37 pm
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brotherdave wrote:
I'd just get the copper tape. It's reasonably cheap. Also on a Jazz I'd want a solid copper self adhesive sheet. Guitarpartsresource dot com has the better quality tape and sheet. I've tried other sources and GPR's is better quality.


Ok! Thanks for the link. I visit the site and buy now :D I hope to take pictures while I do the work, so that everyone can see!!

:hello:

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Post subject: Re: Change PickUp for Fender Jazz Bass (MIM) - Part 2
Posted: Fri May 17, 2013 11:51 am
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After a long time, finally arrived the pickup "Vintage Jazz Bass"...Really beautiful! :lol:

Unfortunately, I have not found the copper foil/tape (buy only the object recommended by BrotherDave from U.S.A. is very expensive for customs in Italy :( ). However, I find aluminum foil/tape to replace copper... I hope it goes well!

As mentioned in the previous post, I hope to pictures during work ;)

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