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I have a Roland RC 550 about 4 years old. Great amp, have it…

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I have a Roland RC...
I have a Roland RC 550 about 4 years old. Great amp, have it connected to a set of Roland V-12 drums that I occasionally play out. I tried to hook it up as I have in the past for a gig, and only the 3rd input jack works, the other three are dead. I had been using unbalanced cords with Direct box but no sound at all. Now direct from drum brain to amp any clue why the others won;t work. Thinking I have something set wrong Thanks
Submitted: 2 years ago.Category: Electronic Musical Instruments
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Answered in 5 hours by:
2/24/2016
Electronic Musical Instrument Expert: ITPeter, Electronics Engineer replied 2 years ago
ITPeter
ITPeter, Electronics Engineer
Category: Electronic Musical Instruments
Satisfied Customers: 20,164
Experience: Over 16 years' experience in installing and repairing electronics.
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Hi Jim,

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Electronic Musical Instrument Expert: ITPeter, Electronics Engineer replied 2 years ago

Is it the KC-550 amp that you have?

Have you tried checking for any broken connections at the rear of the input panel?

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Customer reply replied 2 years ago
No I have not tried that yet...The AMP is the 550, and is on a gig site. I will have access to it tomorrow. The last time I used it (9) months ago, they all worked, the other day, only 3 worked
Electronic Musical Instrument Expert: ITPeter, Electronics Engineer replied 2 years ago

Ok, let me know if you find any broken connections, or damaged solder joints inside the panel....

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