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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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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i realize that its been a while since anyone has posted on this forum. i have the same keyboard and sadly it has the same problem as well. i also beleave the problem is the main pcb. i have found the service manual and it shows some schematics for the board and a lot more useful information. sadly im not as skilled with electronics but i will try my best to fix it since i got it as a gift from my father in law and it my first keyboard so it has sentimental value. here is a link for the manual.

 
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Welcome.

Sadly the Op never came back to advise the outcome of their repair efforts.

If you do not have the tech skills you may be better taking it to an electronics repair shop.

If you want to try yourself then the meter Gary suggests is a start and you will need a general multi meter, a pair of needle nosed pliers, fine tipped soldering iron, so you are at $150 before you even open up the keyboard.

Opening up the keyboard and viewing the circuit board may reveal distorted, leaking or heat damaged components.

A sniff around searching for burnt plastic odour can also narrow down problems to a particular area of the circuit board.
 
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bok

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A while back I had a Technics KN800 keyboard with the exact same symptoms (only lcd backlight). The issue was the CPU. After replacing that everything started working. Replacing the surface mounted CPU is a bit tricky but with a proper heat gun it is not too difficult.
 

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