Kawai Synthesizers

You can download factory program set from here:

http://www.kawaius.com/Downloads/download_archive-2.html

But if instrument doesn't show anything on the display, I can't  
imagine how to work with it - even in the case instrument itself is OK  
and there's just empty memory.

First be absolutely sure that display works. Maybe it's just contrast  
setting, maybe new display needs some other value of limiting  
resistor... Then you can continue.

In any case I would check and reseat all cables and IC's in sockets,  
after long years of sweet sleep contacts can be oxidized. Check also  
PSU if voltages are on the spec. Maybe you need to recap PSU...

Daniel Forro


On Jan 19, 2015, at 2:53 AM, evang.paul@... [kawaisynths] wrote:

> Glad to see there are other out there with this little classic. I  
> bought a K4 (not K4r) a few years back as a part of a bundle deal  
> from a friend. It was in used but working order and it saw a couple  
> years of use from me too, and all was well.
>
> Then, I started building a Midi Controller following some plans  
> online, and needed a 2x16 character LCD for the project. So, being  
> cheap and crafty at the time, I said to myself, rather than buy one,  
> why not just borrow the one from inside the K4. That worked out at  
> the time.
>
> Fast-forward approx 10 years, and I want to restore that K4 to its  
> original glory and use it as a keyboard once again. Problem is, I  
> can't find the original LCD or midi controller project anywhere...
>
> So, a couple weeks ago I ordered the exact replacement off of eBay.  
> While waiting for the replacement to come in, I opened the thing up  
> and saw that the button-cell battery had leaked, so I replaced it  
> (yes, i know, big no-no). Then, i received the LCD, made an  
> improvised ribbon cable with an old IDE cable i had, and soldered  
> one end to the LCD and connected the other end to the board  
> following the 1:1 pinout i saw on the schematic i have.
>
> Now, I turn the unit on, the LCD turns on/green backlight, however  
> NOTHING else happens. No message at all on the display and, when  
> connecting headphones to the audio outs, nothing is heard when keys  
> are pressed.
>
> I just read in the other LCD thread that, if the battery is removed  
> while the unit's unplugged, this causes a loss of data. Now, is this  
> what's affecting me, or is there a greater issue?
>
> Any input would be greatly appreciated!!!!
>