Ibanez Roadstar II RS440 Push/push pot. - Jemsite
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post #1 of 19 (permalink) Old 09-30-2018, 04:05 PM Thread Starter
 
Join Date: Sep 2006
Location: Castleford, England
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Ibanez Roadstar II RS440 Push/push pot.

Hi there

I'm really struggling to find a replacement push push pot for the tone control on my 1984 Roadstar II.

It wasn't working right when I bought it, when I stripped it off guitar I could get it to work but I think it's past its best.

No matter what I search the Internet for I always end up with push/pull pots and dpdt switches, it on needs to be spst.

Thanks in advance

Tim
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post #2 of 19 (permalink) Old 09-30-2018, 06:42 PM
 
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Re: Ibanez Roadstar II RS440 Push/push pot.

Quote:
Originally Posted by Mission1979 View Post
Hi there

I'm really struggling to find a replacement push push pot for the tone control on my 1984 Roadstar II.

It wasn't working right when I bought it, when I stripped it off guitar I could get it to work but I think it's past its best.

No matter what I search the Internet for I always end up with push/pull pots and dpdt switches, it on needs to be spst.

Thanks in advance

Tim
Is this a trick question?

A DPDT switch has 6 contacts, SPST has 2, just use 2 of the 6 on a DPDT, hey presto, SPST.
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post #3 of 19 (permalink) Old 10-03-2018, 07:59 AM Thread Starter
 
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Not a trick question at all.

Would like it to be as original as possible plus the space under the scratchplate where the tone control is limited.

Thought they'd be easy to find, I was wrong.
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post #4 of 19 (permalink) Old 10-03-2018, 10:19 AM
 
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Re: Ibanez Roadstar II RS440 Push/push pot.

Guitar electronics go bad over time and need replacing. No one cares if it's not THE original part under the hood; as long as it works. Also, parts made back in the 80s will probably not be as reliable as they are today, if you get them from a reputable source/company.
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post #5 of 19 (permalink) Old 10-05-2018, 01:50 AM Thread Starter
 
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Thanks for your reply.

Doesn't like there's enough room for a dimarzio push pull dpdt pot.

A cts one is 5mm shorter so should go.

I was always under the impression that tone controls were linear but most for sale are logarithmic.

Can someone confirm the spec of the one I need for my HSS configuration?

Thanks
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post #6 of 19 (permalink) Old 10-05-2018, 05:50 AM
 
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Quote:
Originally Posted by Mission1979 View Post
Thanks for your reply.

Doesn't like there's enough room for a dimarzio push pull dpdt pot.

A cts one is 5mm shorter so should go.

I was always under the impression that tone controls were linear but most for sale are logarithmic.

Can someone confirm the spec of the one I need for my HSS configuration?

Thanks
Linear or Log doesn't really matter, what's more important is that Dimarzio and CTS are US parts and will not be metric and may not fit the hole or the knob giving you yet another problem.
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post #7 of 19 (permalink) Old 10-05-2018, 04:05 PM Thread Starter
 
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Quote:
Originally Posted by sepulchrave View Post
Quote:
Originally Posted by Mission1979 View Post
Thanks for your reply.

Doesn't like there's enough room for a dimarzio push pull dpdt pot.

A cts one is 5mm shorter so should go.

I was always under the impression that tone controls were linear but most for sale are logarithmic.

Can someone confirm the spec of the one I need for my HSS configuration?

Thanks
Linear or Log doesn't really matter, what's more important is that Dimarzio and CTS are US parts and will not be metric and may not fit the hole or the knob giving you yet another problem.
Oh gosh, was just about to buy a cts log pot.

Any recommendations?

Thanks
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post #8 of 19 (permalink) Old 10-05-2018, 05:28 PM
 
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Re: Ibanez Roadstar II RS440 Push/push pot.

Quote:
Originally Posted by Mission1979 View Post
Oh gosh, was just about to buy a cts log pot.

Any recommendations?

Thanks
https://www.axesrus.co.uk/Medium-Sha...hpushalpha.htm
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post #9 of 19 (permalink) Old 10-05-2018, 05:33 PM
 
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Re: Ibanez Roadstar II RS440 Push/push pot.

If you look at the specs tab you can compare dimensions with yours to make sure everything fits ok.
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post #10 of 19 (permalink) Old 10-13-2018, 03:54 PM Thread Starter
 
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Quote:
Originally Posted by sepulchrave View Post
If you look at the specs tab you can compare dimensions with yours to make sure everything fits ok.
Hi got a push push pot from that site. Its a bit deeper but not by much.

Tool body to work today and took out some material with a 30mm forstner bit.

Will fit in easily now. I've ordered some shielding paint to re-do cavity.

Will hopefully get chance to start soldering things back together this weekend.

Thanks thanks for your help finding a replacement.

I'll let everyone know how it all goes.
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post #11 of 19 (permalink) Old 11-17-2018, 05:34 PM Thread Starter
 
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I need wiring help now.

Doesn't seem like a straight swap.

Can anyone tell me how to sort the wiring out?

It doesn't appear pushing the pots in and out makes any difference to the sound. Also the tone control only seems to work on the bridge position on the switch.

Many thanks in advance.
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post #12 of 19 (permalink) Old 11-17-2018, 06:12 PM
 
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That photo doesn't help, you need to short the coil split to ground via the pot switch to split the humbucker, it looks like you have the middle pickup connected reverse polarity, is that what you want?
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post #13 of 19 (permalink) Old 11-17-2018, 07:13 PM Thread Starter
 
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Quote:
Originally Posted by sepulchrave View Post
That photo doesn't help, you need to short the coil split to ground via the pot switch to split the humbucker, it looks like you have the middle pickup connected reverse polarity, is that what you want?
All I've changed is the push/push pot. Tried to put the wires back to do the same as I expect it did from the factory. The white wire is one one side of the switch and the black goes down to one leg of the pot. I'm guessing it is missing a ground somewhere.

It was the original 1984 that was goosed. Wouldn't stay in and so I guess was split/tapped all the time.

It's really awkward to photograph. I might draw the circuit out and put that up see if that makes it clearer.
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post #14 of 19 (permalink) Old 11-17-2018, 08:09 PM
 
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Yes, the tone pot should bleed from the volume pot through the capacitor to ground, the white wire should switch to ground to cut out one of the humbucker coils but be isolated when not switched.
My guess is someone fudged the wiring when the switch failed, you need to work right through it and correct the grounding issues, drawing a circuit diagram is a good way to identify the problem.
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post #15 of 19 (permalink) Old 11-18-2018, 06:35 AM Thread Starter
 
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Quote:
Originally Posted by sepulchrave View Post
Yes, the tone pot should bleed from the volume pot through the capacitor to ground, the white wire should switch to ground to cut out one of the humbucker coils but be isolated when not switched.
My guess is someone fudged the wiring when the switch failed, you need to work right through it and correct the grounding issues, drawing a circuit diagram is a good way to identify the problem.
I've added a ground from the chassis of DPDT switch part to switched leg to back of actual tone pot. Its definitely working better but possibly switching wrong way around.

Just want it finished now.

Really frustrated.

Thanks for your help.
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