Boss gt-8 repair!

 Hello there! Here's a boss gt-8 pedal board that came in with a broken level control. The level potentiometer(pot) is located at the back of the board with all the in/out jacks. Unfortunately, the pot is a little plastic thing and it's not bolted to the metal chassis... So, it's not difficult to break this thing if you use it quite often.  In this case, the pot was cut in half and didn't work anymore. So I bought a metal mini-pot (dual 50kA) which could be mounted to the metal chassis of the gt-8. When disassembling your pedalboard, be careful NOT to remove the on-board mini ROM battery as it this the one that keeps the memory settings and gt-8 firmware stored...
 The tricky part was to unsolder the old pot and solder the new one in. I decided to solder 5 small leads to the pcb and then connect them to the metal pot.  This way, I could place the pot on the same spot on the back of the gt-8, without having to match the location of its lugs with the pcb traces(that would be impossible).
 Once the new heavy duty pot was soldered, I secured it in place and tested that everything works. And it did! Now the level knob is sturdy and secured in place. It's way less fragile than the old one and I don't think it will ever break again.
 So, if you encounter problems with your pedalboard's volume control pot, try swapping it with a heavy duty one. And if it gets a bit noisy when you turn it, just spray some contact cleaner on its back and it will work just fine.
 Here is the schematic diagram of the boss gt-8:
http://www.eserviceinfo.com/downloadsm/44816/Boss_gt8.html



UPDATE!

Sorry I couldn't get clear photos using my phone... 
But I could help you change the pot on your gt-8!

 The 1st step is to download the proper gt-8 service manual and schematic:http://www.eserviceinfo.com/downloadsm/44816/Boss_gt8.html


 Based on the schematic diagram, you need to replace the old pot with a stereo 50Kohm "audio taper" one. You could easily find a stereo (dual) pot on ebay or something. A small metal housing pot will fit in there and will last long(longer than the plastic ones). These pots have 6 pins/lugs.


 I used this one (you need the A50K model):http://www.ebay.com/itm/Stereo-Mixer-Pot-16mm-Audio-Taper-Splined-Dual-Log-A-/120743329648?pt=UK_BOI_Electrical_Components_Supplies_ET&var=&hash=item1c1cdcff70


 You 'll have to unsolder the old pot and wire 6 short cables in its place on the pcb. That way, you can easily mount/bolt the new pot on the metal chassis of your pedal board.
Τhe 6 pot pins are shown on the layout included in the schematic (circuit board main).
You could use your multimeter on the beeper/continuity mode to trace the capacitor and Ground pcb traces. These are the pcb traces where the 6 pot lugs (or the 6 short cables connected to the pot) should be soldered. See the attached image for a complete guide of "what goes where". Mind you, I used a A50k stereo pot and NOT a A500K one as pictured below!
http://img84.imageshack.us/img84/325/bossgt8pot.jpg
http://imageshack.us/photo/my-images/84/bossgt8pot.jpg/

If you don't feel confident about this, save this email and visit a tech or an amp repair shop that could help you out.
Cheers,Thanos



 And here are some pictures taken during the repair: