Roland up-2e. Block of 8 notes lower F to middle C stopped working - any ideas??


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There is a block of 8 notes from lower F - white and black keys not working. Happy to take apart but don’t know what I would be looking for or need to replace. Any ideas?
 
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happyrat1

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First step would be to disconnect the connectors, clean with Deoxit, then reseat connectors and test.

That's where you start...

Gary ;)
 
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First step would be to disconnect the connectors, clean with Deoxit, then reseat connectors and test.

That's where you start...

Gary ;)
Thanks Gary. Are the connectors for each key or for a circuit board? Can you describe the deoxit ……
 

happyrat1

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Disconnect the ribbon cables. Mark them first to get them the right way back.

Spray Contact Cleaner, Deoxit is a brand name, on the connectors.

PLUG THEM BACK IN THE RIGHT WAY.

If that doesn't fix it, take it to a service guy.

The key contacts are something else entirely.

Probably beyond you.

Gary ;)
 

happyrat1

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BTW, the problem is an open circuit somewhere in the keyboard multiplexer matrix.

It could be a dirty connector or it's a failed component.

If you see any burnt diodes that would indicate a serious problem requiring a soldering iron.

Gary ;)
 
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Disconnect the ribbon cables. Mark them first to get them the right way back.

Spray Contact Cleaner, Deoxit is a brand name, on the connectors.

PLUG THEM BACK IN THE RIGHT WAY.

If that doesn't fix it, take it to a service guy.

The key contacts are something else entirely.

Probably beyond you.

Gary ;)
Thanks for taking the trouble to reply. I will try this next week. Regards
 
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