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Fixed the RM600

Posted: Thu Jan 14, 2016 7:32 pm
by NickS
A while back I accidentally plugged a Yamaha keyboard PSU (12v centre +ve) into my Behringer RM600 and blew it up. I got a hold of a schematic for another Behringer DSP-based pedal recently and found that it was similar enough to be able to make a stab at diagnosis. With the aid of the illuminated stand magnifier my daughter gave me for Christmas I removed the grain-of-rice transistor T1.
T1_removed.JPG
T1_removed.JPG (135.86 KiB) Viewed 13 times
With the aid of a wooden skewer and a microscopic dot of contact adhesive I positioned a new grain of rice and soldered it in place.
T1_installed.JPG
T1_installed.JPG (141.27 KiB) Viewed 13 times
..and voleur...
Working_PCB.JPG
Working_PCB.JPG (237.47 KiB) Viewed 13 times
It lives, Igor!!

[Edited to change picture hosting away from Photobucket uploader]

Posted: Thu Jan 14, 2016 11:36 pm
by paul_
Nice one, definitely a fiddly little job doing those surface mount repairs.