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Old 6th Jul 2013, 9:18 pm   #1
bostinbones
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Default Technics Keyboard Help Please

Hi,


I have a Technics KN5000 keyboard. The keys going up from the left C#, F, F#, A, C#, F, A, C# and F have suddenly stopped working. All the others play fine. Any ideas folks?

Many Thanks


Nicola
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Old 6th Jul 2013, 10:27 pm   #2
Radio Wrangler
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Default Re: Technics Keyboard Help Please

Most likely the keys (and other buttons) are wired up as crosspoints in a matrix so that far fewer connections need be made to the microprocessor. It is likely that a single component failing or just one connector pin going drty would take out a pattern of keys.

Opening up and a bit of gentle cleaning of connectors may be all it needs

David
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Old 6th Jul 2013, 11:15 pm   #3
Lucien Nunes
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Default Re: Technics Keyboard Help Please

I don't know the KN5000 innards specifically, however it is worth mentioning that it is quite easy to damage the key contact assemblies of many models of keyboard and digital piano when dismantling and reassembling. Because they are touch-sensitive rather than simple contacts, they are not easy to put right if damaged, and replacements for most Technics products are probably unobtainable by now. Hence there is a risk that if any get disturbed, the keyboard will never be repairable.

First, just in case the system configuration is scrambled, you could try a hard reset. This will erase all memory contents (programming, setups, sequencer memory) so back-up anything you want to keep. With the power off, hold down the left three buttons in the lower row of rhythm buttons, then turn on the power while holding them. If this doesn't restore operation, then I would agree with RW that there is something amiss with the keyscan. Liquid spilled into the keyboard often results in this kind of fault.

If you are not confident with delicate electronic repairs, I would recommend talking to a Technics specialist before taking out any screws. Many shops won't touch them because of the limited parts availability but there are some who have stocks and can provide service.

Lucien
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Old 4th Aug 2013, 9:24 pm   #4
Klystron
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Default Re: Technics Keyboard Help Please

Hello Nicola.

If just one or two of the keys had stopped working I would suspect dust or dirt under the contacts of those particular keys.

However, the scale of the malfunction leads me to suspect this will not be the case. - What both Radio Wrangler and Lucien suggest seems much more likely.

If I were you, I would track down a copy of the service manual for your keyboard: Sometimes these give specific trouble-shooting advice and may help you to discern the cause of the problem with greater certainty.

Klystron.
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Old 5th Aug 2013, 8:33 am   #5
bostinbones
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Default Re: Technics Keyboard Help Please

Hi,

Thanks for your help. I've downloaded the service book. I'll give it a go.

Nicola
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