Yamaha TRB5 Treble Pot - Broken

[Myke]

Hey

I have a Yamaha TRB5 made in 1994 and unfortunately the treble pot does not work. I was wondering if anyone had the original preamp diagram? Or if anybody has any ideas on how to fix this? That would be brilliant.

Cheers

Myke

[JohnFitzgerald]

My TRB5 has a Delano preamp in it, the original preamp is sitting here if pics would help.

[Myke]

If you could do that, it would be wonderful. Not sure if it would help but you never know

[KiOgon]

Hey Myke, if you can post pictures of your pot & wiring I might be able to suggest a replacement.

Cheerz, John

[Myke]

Would that be a picture of it in the body or with it taken out?

[KiOgon]

Start with it in situ if you can get a good shot? Any letters/numbers on will help.

[Myke]

I'll take one tomorrow and post it up here Thank you for your help thus far!

[Myke]

Also just thought to add, It makes an audible click when I either full boost or cut it but only when first plugged in.

[JohnFitzgerald]

Got some snaps of my preamp. Just getting them sorted and will upload them.

[JohnFitzgerald]

[Myke]

Right here's the whole of the preamp. The Treble is the one on the lower right.

[attachment=128104:DSC00092.JPG]

Close Ups
[attachment=128105:DSC00091.JPG]

[attachment=128106:DSC00095.JPG]

[attachment=128107:DSC00097.JPG]

[attachment=128108:DSC00098.JPG]

Hope this helps people

Edit: Just clarifing the position.

Edited February 20, 2013 by Myke

[Myke]

[quote name='KiOgon' timestamp='1361309616' post='1984459']
Hey Myke, if you can post pictures of your pot & wiring I might be able to suggest a replacement.

Cheerz, John
[/quote]

Pics are up

[Myke]

[quote name='JohnFitzgerald' timestamp='1361311519' post='1984519']
Got some snaps of my preamp. Just getting them sorted and will upload them.
[/quote]

Thank you very much

[Myke]

Also I thought to add. When I move the pot the round metal bit in the pictures wobbles, where as when I tried with the Bass pot (which works) it did not

[KiOgon]

Good pics but unfortunately not enough info to see, it needs proper investigating, can't diagnose from here, may well be a fault in the circuit/components & not necessarily the actual pot that's the problem.

Cheerz, John

[Myke]

Would I be able to see if there was a broken chip/resistor/etc?

[Myke]

No one else have any ideas?

Edited February 25, 2013 by Myke

[andyowenuk]

Do you have access to a multimeter? I would start by just checking the pot itself to ensure it is contacting, not hard to do.
I'm pretty sure if it is the pot that you could find an alternative pot to use if it is that.

Checking a potentiometer:
www.youtube.com/watch?v=Eh2cQCLie5A

[Myke]

[quote name='andyowenuk' timestamp='1361816742' post='1991394']
Do you have access to a multimeter? I would start by just checking the pot itself to ensure it is contacting, not hard to do.
I'm pretty sure if it is the pot that you could find an alternative pot to use if it is that.

Checking a potentiometer:
www.youtube.com/watch?v=Eh2cQCLie5A
[/quote]

I think so, I'll check that out Thanks