Bill,
If you are using the same cable, same settings, etc.. and one works and the other doesn't it's likely one of the chips. It's a quick, easy and inexpensive repair here.
Gary
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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)