Technics SX-KN3000 Fault

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I have a Technics SX-KN3000 keyboard which has produced a fault.

I'm unable to get the keyboard to function at all apart from the LCD backlight lighting up when I power the keyboard up. No sound or any other functionality seems to work. I'm experienced in electronic repair and I believe that the fault is with the main board.

Has anyone else experienced this problem and if so, does anyone know or can recommend where I maybe able to source spare parts from? I am aware that this model ceased production around 10 years ago. So I'm pretty sure I won't be able to get my hands on brand new parts.

Thanks in advance.
 
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www.wdgreenhill.com although the KN3000 went out of production more than 20 years ago. Just check you havent left an earphone connection adapter in the earphone point.
 
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happyrat1

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Just in case you're not able to find parts anywhere else there's always the chance of picking up a junker on Ebay for parts.

Otherwise, you could start by eliminating the obvious possibilities like leaking or bulging electrolytic capacitors.

$100 buys you a half decent ESR meter these days and no electronics toolkit should be without one.

They allow you to test capacitors without removing them from the circuit.


Gary ;)
 
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Hi,

Thanks for your messages/suggestions.

I've checked the headphone socket and also disconnected it from the main board to eliminate that been the problem. Unfortunately this doesn't seem to be the problem.

I'm currently under the belief that it's the main CPU board that's the problem. I did manage to speak to someone on the phone and they advised me that it's a common problem with the Technics keyboards. It's just a matter of getting my hands on a replacement.

I've also attempted to get my hands on a schematic for it, but I've not had much look.
 
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