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Technics KN7000 switching Off by itself

racka11

racka11
Slovenia

Total Posts: 5
Joined: July 16, 2016

My keyboard KN7000 suddenly is switching Off by itself.
Screen 3-4x blinked in period 20sek and than keyboard stoped working.
I can turn it ON again, but after aprox. 30sek, everything is the same.
3-4x display blinked and keyboard shutdown by itself.
Try to connect in different wall socket, but same result.
I was using keyboard on stage for about an hour in 23C, so overheating is no problem.
When I come at home, was try again and after 5 minutes, same problem.
In those 5 minutes, before the keyboard "die", everything is working as normal.
I own it about 7-8 years, no problems at all, till now!

Any advice? Please Help!

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Posted on March 30, 2018 at 5:10 PM
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7 Replies

jd5live

jd5live
United Kingdom

Total Posts: 360
Joined: June 8, 2014

Re: Technics KN7000 switching Off by itself

Hi , Sorry to hear you are having problems with your KN7000, I would recommend that we start with a Factory reset this will restore the keyboard to all initial settings. Doing a reset means you will lose any setting you have not stored, but this can not be helped.
Factory reset is :- Press the first 4 RHYTHM GROUP buttons at the same time and while holding them down turn the power ON, hold till the screen says the message "Factory Initial Completed" now see if this has cleared the problem. Hopefully it has cleared however please come back if it is not successful.
Best regards John.

Posted on March 30, 2018 at 6:05 PM

racka11

racka11
Slovenia

Total Posts: 5
Joined: July 16, 2016

Re: Technics KN7000 switching Off by itself

Thanks for very fast reply!

I made "Factory Initial" as you suggest and than all 12 pages self diagnostic tests ( press and hold keys C#3 + D#3 + C#4 and turn ON keyboard).
All tests (ROM, RAM, CPU, Panel, LED, Interface .... ALL DEVICE OK.
At the moment (aprox. 20 minutes) my "Baby" KN7000 is working perfect.
Maybe Factory Initial really helped!? I loose just my on screen picture, other stuff is saved on SD card.

.... I just opened bottle of red wine for success, but it happened again.
Keyboard turned off by itself. I heard some funny scratch noise just before keyboard die.


Hmmm, I am thinking there must be something wrong with voltage adaptor inside, or some small parts I can replace with equivalent part. I am just hoping, motherboard is OK! Where I live, there isn't Technics Service so I have to drive my baby to Yamaha, Korg, Roland Service. I hope they will figure out, what is wrong.
Do you have any idea, what it could be?

Posted on March 30, 2018 at 7:34 PM

jd5live

jd5live
United Kingdom

Total Posts: 360
Joined: June 8, 2014

Re: Technics KN7000 switching Off by itself

I will forward to our friendly engineer, it seems odd that the factory reset made the keyboard work for a short while. This may indicate a power supply problem and as it heats up the keyboard shuts down, get the + and - 15 volt regulators checked out as they are prone to failing but this normally results in just no audio output. However you will need it checked through. I wish you good luck and please let us know how you get on.
Regards John.

Posted on March 31, 2018 at 2:05 AM

davetutt

davetutt
United Kingdom

Total Posts: 166
Joined: January 12, 2015

Re: Technics KN7000 switching Off by itself

Hi there
The KN7000 needs some work. The crucial parts are the 2 15 volt regulators and the two transistors in the 5volt and 3.3volt circuits as well as all their capacitors. Have a look around the site and you will find my notes on how this is best done to increase the reliability of the machine.

Posted on April 1, 2018 at 10:00 PM

racka11

racka11
Slovenia

Total Posts: 5
Joined: July 16, 2016

Re: Technics KN7000 switching Off by itself

Thanks for advice! I am not technician or engineer, so I will give your tips to Service. Tomorrow I will drive my keyboard to specialist for Yamaha, Korg .... keyboard service. I also download Service manual for KN7000, so they can view, how it is assemble.
I just wonder, where can we order original Parts for keyboard or we can replace with equivalent Parts from another similar equipment!?
I am looking around the site, but couldn't found your notes!?

Those days, without my beloved KN7, I am searching on YT for my next keyboard if we cant repair my,... That remind me, the day I bring it home my KN.
I was travelling 1400km (to Dusseldorf GER) in one direction to buy it. My associate is Art teacher and he draw with oil paint 120x60cm big paint of my KN with Sunset behind ...
Well, enough tears, everything will be OK!!!

I will report!

Posted on April 2, 2018 at 7:56 AM

racka11

racka11
Slovenia

Total Posts: 5
Joined: July 16, 2016

Re: Technics KN7000 switching Off by itself

Here we go again!
It was electrical regulators and some transistors problem. They replaced it, and my KN is live again.
I paid 180 EUR for parts and work, not cheap, but this was my first and last option.
I spoke with specialist and he told me, there is a problem in Europe, because there isn't enough people
who can servicing instruments or similar audio equipment, users just buy new stuff.

And at the end, he was surprised how my KN7 is assembled inside. Perfect, logical, and with very good parts.

Thats it. Don't buy new, make old live again.

Just one question:
Could anyone explain to me step by step, how can I play mp3 files with my KN7? I am using Mac and I have original Panasonic SD card writer/reader.

Posted on April 6, 2018 at 4:26 PM

davetutt

davetutt
United Kingdom

Total Posts: 166
Joined: January 12, 2015

Re: Technics KN7000 switching Off by itself

To extend the life of these instruments they all need heatsinks on the parts that were replaced. I move them all off board and put a large heatsink over the top of the rear connectors. Without it will probably fail again at some point with the same fault.

The number of people doing these sort of repairs are very few and far between. I advise on repairs right across the world on a number of old products but it is up to the person to find a willing local engineer to try what I suggest. Of course remote diagnostics is very hit and miss so it is not exactly a given that I can advise correctly first time! I don't really have the time to do anything much more than I do at the moment but do take in equipment from quite a distance already!

I must admit I haven't tried MP3 with the 7000. I'm not a player so I haven't got the need, I am sure though there will be someone here who can give you a pointer. I would think MP3 would be out as the 7000 doesn't have a decoder as far as I am aware for compressed audio but it would probably do wav okay.
Dave

Posted on April 6, 2018 at 6:29 PM