Myke Posted February 19, 2013 Share Posted February 19, 2013 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 Quote Link to comment Share on other sites More sharing options...
JohnFitzgerald Posted February 19, 2013 Share Posted February 19, 2013 My TRB5 has a Delano preamp in it, the original preamp is sitting here if pics would help. Quote Link to comment Share on other sites More sharing options...
Myke Posted February 19, 2013 Author Share Posted February 19, 2013 If you could do that, it would be wonderful. Not sure if it would help but you never know Quote Link to comment Share on other sites More sharing options...
KiOgon Posted February 19, 2013 Share Posted February 19, 2013 Hey Myke, if you can post pictures of your pot & wiring I might be able to suggest a replacement. Cheerz, John Quote Link to comment Share on other sites More sharing options...
Myke Posted February 19, 2013 Author Share Posted February 19, 2013 Would that be a picture of it in the body or with it taken out? Quote Link to comment Share on other sites More sharing options...
KiOgon Posted February 19, 2013 Share Posted February 19, 2013 Start with it in situ if you can get a good shot? Any letters/numbers on will help. Quote Link to comment Share on other sites More sharing options...
Myke Posted February 19, 2013 Author Share Posted February 19, 2013 I'll take one tomorrow and post it up here Thank you for your help thus far! Quote Link to comment Share on other sites More sharing options...
Myke Posted February 19, 2013 Author Share Posted February 19, 2013 Also just thought to add, It makes an audible click when I either full boost or cut it but only when first plugged in. Quote Link to comment Share on other sites More sharing options...
JohnFitzgerald Posted February 19, 2013 Share Posted February 19, 2013 Got some snaps of my preamp. Just getting them sorted and will upload them. Quote Link to comment Share on other sites More sharing options...
JohnFitzgerald Posted February 19, 2013 Share Posted February 19, 2013 Quote Link to comment Share on other sites More sharing options...
Myke Posted February 20, 2013 Author Share Posted February 20, 2013 (edited) 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 Quote Link to comment Share on other sites More sharing options...
Myke Posted February 20, 2013 Author Share Posted February 20, 2013 [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 Quote Link to comment Share on other sites More sharing options...
Myke Posted February 20, 2013 Author Share Posted February 20, 2013 [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 Quote Link to comment Share on other sites More sharing options...
Myke Posted February 20, 2013 Author Share Posted February 20, 2013 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 Quote Link to comment Share on other sites More sharing options...
KiOgon Posted February 20, 2013 Share Posted February 20, 2013 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 Quote Link to comment Share on other sites More sharing options...
Myke Posted February 20, 2013 Author Share Posted February 20, 2013 Would I be able to see if there was a broken chip/resistor/etc? Quote Link to comment Share on other sites More sharing options...
Myke Posted February 25, 2013 Author Share Posted February 25, 2013 (edited) No one else have any ideas? Edited February 25, 2013 by Myke Quote Link to comment Share on other sites More sharing options...
andyowenuk Posted February 25, 2013 Share Posted February 25, 2013 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 Link to comment Share on other sites More sharing options...
Myke Posted February 25, 2013 Author Share Posted February 25, 2013 [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 Quote Link to comment Share on other sites More sharing options...
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